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Электронный компонент: BTF1A16G-TR

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Data Sheet
March 2001
Dual Differential Transceiver BTF1A
With Idle Bus Indicator
Features
Driver Features
s
Produces a logic zero in third state
s
400 mV difference voltage in third state
s
Two line drivers per package
s
Logic to convert TTL input logic levels to differen-
tial, pseudo-emmiter coupled logic (ECL) output
logic levels
s
No line loading when V
CC
= 0 V
s
High output driver for 50
loads
s
200 mA short-circuit current (typical)
s
2.0 ns maximum propagation delay
s
<0.2 ns output skew (typical)
Receiver Features
s
Two line receivers per package
s
High input impedance
8 k
s
Logic that converts differential input logic levels to
TTL output logic levels
s
4.0 ns maximum propagation delay
s
<0.20 V input sensitivity (typical)
s
-
1.2 V to
+
7.2 V common-mode range
Common Device Features
s
Common enable for each driver/receiver pair
s
Operating temperature range: 40
C to +125
C
(wider than the 41 Series)
s
Single 5.0 V
5% supply
s
400 Mbits/s maximum data rate
s
Meets enhanced small device interface (ESDI)
standards
s
Electrostatic discharge (ESD) performance better
than the 41 Series
s
Lower power requirement than the 41 Series
Description
The BTF1A device is a dual differential transceiver
circuit that transmits and receives digital data over
balanced transmission lines and is compatible with
Lucent Technologies Microelectronics Group differ-
ential drivers and receivers. It is designed to provide
a strong logic zero when in the third state. The mini-
mum difference voltage in the third state is 400 mV. It
is designed specifically for bus applications where a
well-defined logic state is needed when the bus is
idle. The driver puts out a logic zero when in the third
state mode, which is easily overriden by an active
buffer on the bus. When all the buffers on the bus are
inactive (third state), the signal on the bus is a zero
indicating that the bus is idle.
The dual drivers translate input TTL logic levels to dif-
ferential pseudo-ECL output levels. The dual receiver
converts differential input logic levels to TTL output
levels. Each driver/receiver pair has its own common
enable control allowing serial data and a control clock
to be transmitted and received on a single integrated
circuit. The BTF1A transceiver requires the customer
to supply termination resistors on the circuit board.
The powerdown loading characteristics of the
receiver input circuit are approximately 8 k
relative
to the power supplies; hence, it will not load the
transmission line when the circuit is powered down.
For those circuits with termination resistors, the line
will remain impedance matched when the circuit is
powered down. The driver does not load the line
when it is powered down.
2
Agere Systems Inc.
Data Sheet
March 2001
With Idle Bus Indicator
Dual Differential Transceiver BTF1A
Pin Information
12-2747.a(F)
Figure 1. Differential Transceiver Logic Diagram
Table 1. Enable Truth Table
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are abso-
lute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess
of those given in the operational sections of the data sheet. Exposure to absolute maximum ratings for extended
periods can adversely affect device reliability.
Table 2. Absolute Maximum Ratings
ED
ER
D1
D2
R1
R2
0
0
Active
Active
Active
Active
1
0
Disabled
Disabled
Active
Active
0
1
Active
Active
Disabled
Disabled
1
1
Disabled
Disabled
Disabled
Disabled
Parameter
Symbol
Min
Max
Unit
Power Supply Voltage
V
CC
--
6.5
V
Ambient Operating Temperature
T
A
-
40
125
C
Storage Temperature
T
stg
-
55
150
C
1
2
3
4
5
6
7
8
ED
16
15
14
13
12
11
10
9
RO1
DI1
V
CC
ER
GND
DI2
RO2
DO1
RI1
RI1
DO1
DO2
DO2
RI2
RI2
D1
R2
BTF1A
D2
R1
Agere Systems Inc.
3
Data Sheet
March 2001
With Idle Bus Indicator
Dual Differential Transceiver BTF1A
Electrical Characteristics
For variations in electrical characteristics over the temperature range, see Figure 10 through Figure 12.
Table 3. Power Supply Current Characteristics
T
A
=
-
40 C to +125 C, V
CC
= 5 V
0.25 V.
Third State
The BTF1A driver produces pseudo-ECL levels, and has a third-state mode, which is different than a conventional
TTL device. When a driver is placed in the third state, the base of the output transistors are pulled low, bringing the
outputs below the active-low level. The BTF1A is unique because it provides a logic zero at its output when in the
third state. If all the buffers on the bus are in the third state, the BTF1A is designed to deliver a logic zero to the bus
to act as an indicator that the bus is idle. The guaranteed zero level, Vdo Vdo, is 0.4 V.
Parameter
Symbol
Min
Typ
Max
Unit
Power Supply Current (V
CC
= 5.5 V)
All Outputs Disabled
All Outputs Enabled
I
CC
I
CC
--
--
40
20
65
35
mA
mA
4
Agere Systems Inc.
Data Sheet
March 2001
With Idle Bus Indicator
Dual Differential Transceiver BTF1A
Electrical Characteristics
(continued)
Table 4. Driver Voltage and Current Characteristics
For variations in output voltage over the temperature range, see Figure 10 and Figure 11. T
A
=
-
40 C to +125 C.
Parameter
Symbol
Min
Typ
Max
Unit
Output Voltages:
Low
1
1. Values are with terminations as per Figure 7.
V
OL
V
OH
1.4
V
OH
-
1.1
V
OH
-
0.65
V
High
1
:
V
OH
V
CC
-
1.8
V
CC
-
1
V
CC
-
0.8
V
Differential Voltage (V
OH
V
OL
)
V
DIFF
0.65
1.1
1.4
V
Output Voltage Third State:
Difference Voltage Vdo - Vdo
V
DIFZ
0.4
0.6
--
V
Third State, I
OH
= 1.0 mA, V
CC
= 4.75 V
V
OZ
--
--
V
OL
-
0.2
V
Output Voltages (T
A
= 0 C to 85 C):
Low
1
V
OL
V
OH
1.4
V
OH
-
1.1
V
OH
-
0.8
V
High
1
:
V
OH
V
CC
-
1.5
V
CC
-
1
V
CC
-
0.8
V
Differential Voltage (V
OH
V
OL
)
V
DIFF
0.8
1.1
1.4
V
Input Voltages:
Low, V
CC
= 5.25 V:
V
IL
2
2. The input levels and difference voltage provide zero noise immunity and should be tested only in a static, noise-free environment.
--
--
0.8
V
Data Input
V
IL
3
3. Test must be performed one lead at a time to prevent damage to the device.
--
--
0.8
V
Enable Input
V
IL
3
--
--
0.7
V
High, V
CC
= 4.75 V
V
IH
2
2.0
--
--
V
Clamp, V
CC
= 4.75 V, I
I
= 5.0 mA
V
IK
--
--
-
1.0
V
Short-circuit Output Current, V
CC
= 5.25 V
I
OS
100
--
--
mA
Input Currents, V
CC
= 5.25 V:
Low, V
I
= 0.4 V
I
IL
--
--
-
400
A
High, V
I
= 2.7 V
I
IH
--
--
20
A
Reverse, V
I
= 5.25 V
I
IH
--
--
100
A
Agere Systems Inc.
5
Data Sheet
March 2001
With Idle Bus Indicator
Dual Differential Transceiver BTF1A
Electrical Characteristics
(continued)
Table 5. Receiver Voltage and Current Characteristics
For variation in minimum V
OH
and maximum V
OL
over the temperature range, see Figure 10. T
A
= 40 C to +125 C.
Parameter
Symbol
Min
Typ
Max
Unit
Output Voltages V
CC
= 4.75 V:
Low, I
OL
= 8.0 mA
1
1. The input levels and difference voltage provide zero noise immunity and should be tested only in a static, noise-free environment.
V
OL
--
--
0.5
V
High, I
OH
=
-
400 A
V
OH
2.4
--
--
V
Enable Input Voltages:
Low, V
CC
= 5.25 V
V
IL
1
--
--
0.7
V
High, V
CC
= 4.75 V
V
IH
1
2.0
--
--
V
Clamp, V
CC
= 4.75 V, I
I
= 5.0 mA
V
IK
--
--
-
1.0
V
Minimum Differential Input Voltages, V
IH
V
IL
:
2
2. Outputs of unused receivers assume a logic 1 level when the inputs are left open. (It is recommended that all unused positive inputs
be tied to the positive power supply. No external series resistor is required.)
-
0.80 V < V
IH
< 7.2 V,
-
1.2 V < V
IL
< 6.8 V
V
TH
1
--
0.1
0.20
V
Input Offset Voltage
V
OFF
0.03
0.05
V
Output Currents, V
CC
= 5.25 V:
Off-state (high Z), V
O
= 0.4 V
I
OZL
--
--
20
A
Off-state (high Z), V
O
= 2.4 V
I
OZH
--
--
20
A
Short Circuit
I
OS
3
3. Test must be performed one lead at a time to prevent damage to the device.
25
--
100
mA
Enable Input Currents, V
CC
= 5.25 V:
Low, V
IN
= 0.4 V
I
IL
--
--
400
A
High, V
IN
= 2.7 V
I
IH
--
--
20
A
Reverse, V
IN
= 5.5 V
I
IH
--
--
100
A
Differential Input Currents:
Low, V
IN
= 1.2 V
I
IL
--
--
-
1.0
mA
High, V
IN
= 7.2 V
I
IH
--
--
1.0
mA
6
Agere Systems Inc.
Data Sheet
March 2001
With Idle Bus Indicator
Dual Differential Transceiver BTF1A
Timing Characteristics
Table 6. Driver Timing Characteristics (See Figure 3 and Figure 4.)
For t
P1
and t
P2
propagation delays over the temperature range, see Figure 13. Propagation delay test circuit con-
nected to output is shown in Figure 7. T
A
=
-
40 C to +125 C, V
CC
= 5 V
0.25 V.
Table 7. Receiver Timing Characteristics (See Figure 5 and Figure 6.)
For propagation delays (t
PLH
and t
PHL
) over the temperature range, see Figure 14 and Figure 15. Propagation delay
test circuit connected to output is shown in Figure 8. T
A
=
-
40 C to +125 C, V
CC
= 5 V
0.25 V.
Parameter
Symbol
Min
Typ
Max
Unit
Propagation Delay:
Input High to Output
1
1. CL = 5 pF. Capacitor is connected from each output to ground.
t
P1
2
2. tP1 and tP2 are measured from the 1.5 V point of the input to the crossover point of the outputs (see Figure 3).
0.8
1.2
2.0
ns
Input Low to Output
1
t
P2
2
0.8
1.2
2.0
ns
Capacitive Delay
tp
--
0.02
0.03
ns/pF
Disable Time (either E1 or E2):
High-to-High Impedance
t
PHZ
4
8
12
ns
Low-to-High Impedance
t
PLZ
4
8
12
ns
Enable Time (either E1 or E2):
High Impedance to High
t
PZH
4
8
12
ns
High Impedance to Low
t
PZL
4
8
12
ns
Output Skew:
|t
P1
t
P2
|
t
skew1
--
0.1
0.3
ns
|t
PHH
t
PHL
|, |t
PLH
t
PLL
|
t
skew2
--
0.2
0.5
ns
Difference Between Drivers
t
skew
--
--
0.3
ns
Rise Time (20%--80%)
t
tLH
--
0.7
2
ns
Fall Time (80%--20%)
t
tHL
--
0.7
2
ns
Parameter
Symbol
Min
Typ
Max
Unit
Propagation Delay:
Input to Output High
t
PLH
1.5
2.5
4.0
ns
Input to Output Low
t
PHL
1.5
2.5
4.0
ns
Pulse Width Distortion, ltpHL-tpLHI:
Load Capacitance (C
L
) = 15 pF
tskew1
--
--
0.7
ns
Load Capacitance (C
L
) = 150 pF
tskew1
--
--
4.0
ns
Output Waveform Skews:
Part-to-Part Skew, T
A
= 75 C
tskew1p-p
--
0.8
1.4
ns
Part-to-Part Skew, T
A
= 40 C to +125 C
tskew1p-p
--
--
1.5
ns
Same Part Skew
tskew
--
--
0.3
ns
Disable Time, C
L
= 5 pF:
High-to-high Impedance
t
PHZ
--
5
12
ns
Low-to-high Impedance
t
PLZ
--
5
12
ns
Enable Time:
High Impedance to High
t
PZH
--
8
12
ns
High Impedance to Low
t
PZL
--
8
12
ns
Rise Time (20%--80%)
t
tLH
--
--
3.0
ns
Fall Time (80%--20%)
t
tHL
--
--
3.0
ns
Agere Systems Inc.
7
Data Sheet
March 2001
With Idle Bus Indicator
Dual Differential Transceiver BTF1A
Timing Characteristics
(continued)
12-3462(F)
Note: This graph is included as an aid to the system designers. Total circuit delay varies with load capacitance. The total delay is the sum of the
delay due to the external capacitance and the intrinsic delay of the device.
Figure 2. Typical Extrinsic Propagation Delay Versus Load Capacitance at 25 C
12-2677(F)
Figure 3. Driver Propagation Delay Timing
25
50
75
100
125
150
0
LOAD CAPACITANCE, C
L
(pF)
2
1
3
7
175
200
0
4
5
6
EX
TR
IN
S
I
C

PR
OP
AG
ATI
O
N
D
E
L
A
Y
,

t
P
(ns)
t
PHL
(TYP)
t
PLH
(TYP)
INPUT
TRANSITION
OUTPUTS
OUTPUT
OUTPUT
OUTPUT
t
tLH
t
PHL
t
tHL
t
PLH
t
PHH
t
PLL
t
P2
t
P1
20%
80%
20%
80%
2.4 V
1.5 V
0.4 V
V
OH
V
OL
V
OH
(V
OH
+ V
OL
)/2
V
OL
V
OH
(V
OH
+ V
OL
)/2
V
OL
V
OH
V
OL
8
Agere Systems Inc.
Data Sheet
March 2001
With Idle Bus Indicator
Dual Differential Transceiver BTF1A
Timing Characteristics
(continued)
12-2268.d(F)
Note: In the third state, OUTPUT is 0.4 V more negative than OUTPUT.
Figure 4. Driver Enable and Disable Timing
12-2251.b(F)
Figure 5. Receiver Propagation Delay Timing
ED
OUTPUT
OUTPUT
t
PHZ
t
PZH
t
PLZ
t
PZL
3.0 V
1.5 V
0.0 V
V
OH
V
OL
+ 0.2 V
V
OL
V
OL
0.1 V
V
OL
V
OL
0.1 V
OUTPUT 0.4 V
INPUT
OUTPUT
INPUT
80%
20%
3.7 V
3.2 V
2.7 V
V
OH
1.5 V
V
OL
80%
20%
t
PHL
t
tHL
t
PLH
t
tLH
Data Sheet
March 2001
Agere Systems Inc.
9
With Idle Bus Indicator
Dual Differential Transceiver BTF1A
Timing Characteristics
(continued)
12-2538.b(F)
* E2 = 1 while E1 changes state.
E1 = 0 while E2 changes state.
Figure 6. Receiver Enable and Disable Timing
V = 0.5 V
V = 0.5 V
V = 0.5 V
V = 0.5 V
E1*
OUTPUT
t
PHZ
t
PZH
3 V
1.5 V
0 V
E2
3 V
1.5 V
0 V
V
OH
V
OL
t
PZL
t
PLZ
Test Conditions
Parametric values specified under the Electrical Char-
acteristics and Timing Characteristics sections for the
data transmission driver devices are measured with the
following output load circuits.
12-2271.a(F)
Figure 7. Driver Propagation Delay Test Circuit
12-2249(F)
* Includes probe and jig capacitances.
Note: All 458E, IN4148, or equivalent diodes.
Figure 8. Receiver Propagation Delay Test Circuit
DO
DO
200
200
100
TO OUTPUT OF
DEVICE UNDER
TEST
C
L
15 pF*
5 k
2 k
+5 V
10
10
Agere Systems Inc.
Data Sheet
March 2001
With Idle Bus Indicator
Dual Differential Transceiver BTF1A
Output Characteristics
Figure 9 illustrates typical driver output characteristics.
Included are load lines for two typical termination con-
figurations.
12-2269(F)
A. Output Current vs. Output Voltage for Loads
Shown in B and C
12-2270(F)
B. Y Load
12-2271.a(F)
C.
Load
Figure 9. Driver Output Current vs. Voltage
Characteristics
Temperature Characteristics
2-3467(F)
Figure 10. V
OL
and V
OH
Extremes for Drivers vs.
Temperature for 100
Load
12-3468(F)
Figure 11. Differential Voltage (V
OH
V
OL
) for
Drivers vs. Temperature
10
20
30
40
Y LOAD
LOAD
OUTPUT VOLTAGE (V)
OUTPU
T

CURRE
NT (m
A)
V
OL
V
OH
V
CC
2 V
V
CC
1 V
V
CC
DO
60
60
90
DO
DO
DO
200
200
100
25
0
25
50
75
100
2.5
TEMPERATURE (C)
2.0
0
125 150
50
0.5
1.0
1.5
OUTP
UT V
O
LTA
G
E
RELA
TI
VE
T
O
V
CC
V
OH
MAX
V
OH
MIN
V
OL
MAX
V
OL
MIN
25
0
25
50
75
100
0
TEMPERATURE (C)
0.4
1.2
125 150
50
1.0
0.8
0.6
DI
FF
ER
ENT
I
A
L
V
O
LTA
G
E
(V)
V
OH
V
OL
TYP
V
OH
V
OL
MIN
Agere Systems Inc.
11
Data Sheet
March 2001
With Idle Bus Indicator
Dual Differential Transceiver BTF1A
Temperature Characteristics
(continued)
12-3464.a(F)
Figure 12. Minimum V
OH
and Maximum V
OL
vs.
Temperature at V
CC
= 4.5 V for the
Receiver
12-3469.a(F)
Figure 13. Min and Max for t
P1
and t
P2
Propagation
Delays vs. Temperature for the Driver
12-3465(F)
Figure 14. Propagation Delay for a High Output
(t
PLH
) vs. Temperature at V
CC
= 5.0 V for
the Receivers
12-3466(F)
Figure 15. Propagation Delay for a Low Output
(t
PHL
) vs. Temperature at V
CC
= 5.0 V for
the Receivers
25
0
25
50
75
100
0.0
1.6
TEMPERATURE (
C)
0.8
0.4
1.2
2.8
125
150
2.0
VO
LT
AG
E
(V
)
50
2.4
I
OH
MIN
I
OL
MAX
3.2
3.6
3.8
25
0
25
50
75
100
0.5
TEMPERATURE (C)
0.7
1.7
125 150
50
2.1
2.3
P
R
O
P
A
G
AT
IO
N DELA
Y (ns)
1.5
1.3
1.1
0.9
1.9
0.3
RANGE FOR t
P1
AND t
P2
MAX
MIN
25
0
25
50
75
100
1.00
3.00
TEMPERATURE (
C)
2.00
1.50
2.50
4.00
125
150
3.50
MAX
TYP
MIN
PRO
P
A
G
AT
IO
N DEL
AY (ns)
50
25
0
25
50
75
1.00
1.50
2.00
4.00
125
150
50
2.50
3.00
3.50
MAX
TYP
MIN
PR
OP
AG
A
T
I
O
N
DE
LAY
(n
s)
TEMPERATURE (
C)
100
12
Agere Systems Inc.
Data Sheet
March 2001
With Idle Bus Indicator
Dual Differential Transceiver BTF1A
Handling Precautions
CAUTION: This device is susceptible to damage as a result of ESD. Take proper precautions during both
handling and testing. Follow guidelines such as JEDEC Publication No. 108-A (Dec. 1988).
When handling and mounting line driver products, proper precautions should be taken to avoid exposure to ESD.
The user should adhere to the following basic rules for ESD control:
1. Assume that all electronic components are sensitive to ESD damage.
2. Never touch a sensitive component unless properly grounded.
3. Never transport, store, or handle sensitive components except in a static-safe environment.
ESD Failure Models
Lucent employs two models for ESD events that can cause device damage or failure:
1. A human body model (HBM) that is used by most of the industry for ESD-susceptibility testing and protection-
design evaluation. ESD voltage thresholds are dependent on the critical parameters used to define the model.
A standard HBM (resistance = 1500
, capacitance = 100 pF) is widely used and, therefore, can be used for
comparison purposes.
2. A charged-device model (CDM), which many believe is the better simulator of electronics manufacturing expo-
sure.
Table 8 and Table 9 illustrate the role these two models play in the overall prevention of ESD damage. HBM ESD
testing is intended to simulate an ESD event from a charged person. The CDM ESD testing simulates charging and
discharging events that occur in production equipment and processes, e.g., an integrated circuit sliding down a
shipping tube.
The HBM ESD threshold voltage presented here was obtained by using these circuit parameters.
Table 8. Typical ESD Thresholds for Data Transmission Transceivers
Table 9. ESD Damage Protection
Device
HBM Threshold
CDM Threshold
Differential Inputs
>
800
>
1000
All Other Pins
>
2000
>
1000
ESD Threat Controls
Personnel
Processes
Control
Wrist straps
ESD shoes
Antistatic flooring
Static-dissipative materials
Air ionization
Model
Human body model (HBM)
Charged-device model (CDM)
Agere Systems Inc.
13
Data Sheet
March 2001
With Idle Bus Indicator
Dual Differential Transceiver BTF1A
Latch Up
Latch up evaluation has been performed on the data transmission receivers. Latch up testing determines if the
power-supply current exceeds the specified maximum due to the application of a stress to the device under test. A
device is considered susceptible to latch up if the power supply current exceeds the maximum level and remains at
that level after the stress is removed.
Lucent performs latch up testing per an internal test method which is consistent with JEDEC Standard No. 17 (pre-
viously JC-40.2)
CMOS Latch Up Standardized Test Procedure
.
Latch up evaluation involves three separate stresses to evaluate latch up susceptibility levels:
1. dc current stressing of input and output pins.
2. Power supply slew rate.
3. Power supply overvoltage.
Table 10. Latch Up Test Criteria and Test Results
dc Current Stress
of I/O Pins
Power Supply
Slew Rate
Power Supply
Overvoltage
Data Transmission
Receiver ICs
Minimum Criteria
150 mA
1
s
1.75 x Vmax
Test Results
250 mA
100 ns
2.25 x Vmax
14
Agere Systems Inc.
Data Sheet
March 2001
With Idle Bus Indicator
Dual Differential Transceiver BTF1A
Outline Diagrams
16-Pin SOIC (SONB/SOG)
Dimensions are in millimeters.
5-4414(F)
Note: The dimensions in this oultine diagram are intended for informational purposes only. For detailed schematics to assist your design efforts,
please contact your Lucent Technologies sales representative.
Package
Description
Number of
Pins
(N)
Package Dimensions
Maximum Length
(L)
Maximum Width
Without Leads
(B)
Maximum Width
Including Leads
(W)
Maximum Height
Above Board
(H)
Small-Outline,
Gull-Wing
(SOG)
16
10.49
7.62
10.64
2.67
W
0.61
0.51 MAX
H
0.28 MAX
0.10
SEATING PLANE
1.27 TYP
N
L
B
1
PIN #1 IDENTIFIER ZONE
Agere Systems Inc.
15
Data Sheet
March 2001
With Idle Bus Indicator
Dual Differential Transceiver BTF1A
Power Dissipation
System designers incorporating Lucent data transmis-
sion drivers in their applications should be aware of
package and thermal information associated with these
components.
Proper thermal management is essential to the long-
term reliability of any plastic encapsulated integrated
circuit. Thermal management is especially important
for surface-mount devices, given the increasing circuit
pack density and resulting higher thermal density. A
key aspect of thermal management involves the junc-
tion temperature (silicon temperature) of the integrated
circuit.
Several factors contribute to the resulting junction tem-
perature of an integrated circuit:
s
Ambient use temperature
s
Device power dissipation
s
Component placement on the board
s
Thermal properties of the board
s
Thermal impedance of the package
Thermal impedance of the package is referred to as
ja
and is measured in C rise in junction temperature
per watt of power dissipation. Thermal impedance is
also a function of airflow present in system application.
The following equation can be used to estimate the
junction temperature of any device:
T
j
= T
A
+
P
D
ja
where:
T
j
is device junction temperature (C).
T
A
is ambient temperature (C).
P
D
is power dissipation (W).
ja
is package thermal impedance (junction to
ambient
--
C/W).
The power dissipation estimate is derived from two fac-
tors:
s
Internal device power
s
Power associated with output terminations
Multiplying I
CC
times V
CC
provides an estimate of
internal power dissipation.
The power dissipated in the output is a function of the:
s
Termination scheme on the outputs
s
Termination resistors
s
Duty cycle of the output
Package thermal impedance depends on:
s
Airflow
s
Package type (e.g., DIP, SOIC, SOIC/NB)
The junction temperature can be calculated using the
previous equation, after power dissipation levels and
package thermal impedances are known.
Figure 16 illustrates the thermal impedance estimates
for the various package types as a function of airflow.
This figure shows that package thermal impedance is
higher for the narrow-body SOIC package. Particular
attention should, therefore, be paid to the thermal man-
agement issues when using this package type.
In general, system designers should attempt to main-
tain junction temperature below 125 C. The following
factors should be used to determine if specific data
transmission drivers in particular package types meet
the system reliability objectives:
s
System ambient temperature
s
Power dissipation
s
Package type
s
Airflow
12-2753(F)
Figure 16. Power Dissipation
DIP
SOIC/NB
J-LEAD SOIC/GULL WING
AIRFLOW (ft/min)
200
400
600
800
1000
1200
0
40
50
60
70
80
90
100
110
120
130
140
T
H
ERM
A
L RESI
ST
ANCE
ja
(
C/
W
)
Data Sheet
March 2001
With Idle Bus Indicator
Dual Differential Transceiver BTF1A
Agere Systems Inc. reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application.
Copyright 2001 Agere Systems Inc.
All Rights Reserved
Printed in U.S.A.
March 2001
DS01-068ANET-1 (Replaces DS01-068ANET)
For additional information, contact your Agere Systems Account Manager or the following:
INTERNET:
http://www.agere.com
E-MAIL:
docmaster@micro.lucent.com
N. AMERICA:
Agere Systems Inc., 555 Union Boulevard, Room 30L-15P-BA, Allentown, PA 18109-3286
1-800-372-2447, FAX 610-712-4106 (In CANADA: 1-800-553-2448, FAX 610-712-4106)
ASIA PACIFIC: Agere Systems Singapore Pte. Ltd., 77 Science Park Drive, #03-18 Cintech III, Singapore 118256
Tel. (65) 778 8833, FAX (65) 777 7495
CHINA:
Agere Systems (Shanghai) Co., Ltd., 33/F Jin Mao Tower, 88 Century Boulevard Pudong, Shanghai 200121 PRC
Tel. (86) 21 50471212, FAX (86) 21 50472266
JAPAN:
Agere Systems Japan Ltd., 7-18, Higashi-Gotanda 2-chome, Shinagawa-ku, Tokyo 141, Japan
Tel. (81) 3 5421 1600, FAX (81) 3 5421 1700
EUROPE:
Data Requests: DATALINE: Tel. (44) 7000 582 368, FAX (44) 1189 328 148
Technical Inquiries:GERMANY: (49) 89 95086 0 (Munich), UNITED KINGDOM: (44) 1344 865 900 (Ascot),
FRANCE: (33) 1 40 83 68 00 (Paris), SWEDEN: (46) 8 594 607 00 (Stockholm), FINLAND: (358) 9 3507670 (Helsinki),
ITALY: (39) 02 6608131 (Milan), SPAIN: (34) 1 807 1441 (Madrid)
Ordering Information
Part Number
Driver
Terminating
1
1. Indicates on-chip output terminating resistors from each driver output to ground.
Receiver
Terminating
2
2. Indicates on-chip input terminations across receiver inputs.
Package Type
Comcode
BTF1A16G
None
None
16-pin, Plastic SOIC
108648861
BTF1A16G-TR
None
None
Tape and Reel SOIC
108698887