1
IDT74FCT166245T/AT
FAST CMOS 16-BIT BIDIRECTIONAL TRANSCEIVER
INDUSTRIAL TEMPERATURE RANGE
MAY 2001
INDUSTRIAL TEMPERATURE RANGE
FEATURES:
0.5 MICRON CMOS Technology
High-speed, low-power CMOS replacement for ABT functions
Typical t
SK(o)
(Output Skew) < 250ps
Low input and output leakage
1A (max.)
ESD > 2000V per MIL-STD-883, Method 3015; > 200V using
machine model (C = 200pF, R = 0)
Light drive A port: 8mA
High drive B port: +64mA, -32mA
Minimal system switching noise
Typical V
OLP
(Output Ground Bounce) < 0.25V at V
CC
= 5V,
T
A
= 25C (A port switching)
Power off disable outputs permit "live insertion"
Available in SSOP and TSSOP packages
FUNCTIONAL BLOCK DIAGRAM
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
2001 Integrated Device Technology, Inc.
DSC-5458/1
IDT74FCT166245T/AT
FAST CMOS 16-BIT
BIDIRECTIONAL
TRANSCEIVER
DESCRIPTION:
The FCT166245T 16-bit transceiver is built using advanced dual metal
CMOS technology. These high-speed, low-power transceivers are ideal
for synchronous communication between two buses (A and B). The
Direction and Output Enable controls operate these devices as either two
independent 8-bit transceivers or one 16-bit transceiver. The direction
control pin (xDIR) controls the direction of data flow. The output enable pin
(xOE) overrides the direction control and disables both ports. All inputs are
designed with hysteresis for improved noise margin.
The FCT166245T is suited for very low noise, point-to-point driving
where there is a single receiver, or a light lumped load (<100pF). The
buffers are designed to limit the output current to levels which will avoid noise
and ringing on the signal lines without using external series terminating
resistors. These parts have a 8mA driver on the "A" Port and a +64/32mA
driver on the "B" Port, making them ideal for interfacing noisy system busses
to noise sensitive interfaces.
1
DIR
1
O
E
1
A
1
1
A
2
1
A
3
1
A
4
1
A
5
1
A
6
1
A
7
1
A
8
1
B
1
1
B
2
1
B
3
1
B
4
1
B
5
1
B
6
1
B
7
1
B
8
2
DIR
2
O
E
2
A
1
2
A
2
2
A
3
2
A
4
2
A
5
2
A
6
2
A
7
2
A
8
2
B
1
2
B
2
2
B
3
2
B
4
2
B
5
2
B
6
2
B
7
2
B
8
2
INDUSTRIAL TEMPERATURE RANGE
IDT74FCT166245T/AT
FAST CMOS 16-BIT BIDIRECTIONAL TRANSCEIVER
SSOP/ TSSOP
TOP VIEW
PIN CONFIGURATION
Symbol
Description
Max
Unit
V
TERM(2)
Terminal Voltage with Respect to GND
0.5 to +7
V
V
TERM(3)
Terminal Voltage with Respect to GND
0.5 to V
CC
+0.5
V
T
STG
Storage Temperature
65 to +150
C
I
OUT
DC Output Current
60 to +120
mA
ABSOLUTE MAXIMUM RATINGS
(1)
(1)
(1)
(1)
(1)
NOTES:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause
permanent damage to the device. This is a stress rating only and functional operation
of the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect reliability.
2. All device terminals except FCT162XXX and FCT166XXXT(A port) Output and I/O
terminals.
3. Output and I/O terminals for FCT162XXX and FCT166XXXT(A port).
Symbol
Parameter
(1)
Conditions
Typ.
Max.
Unit
C
IN
Input Capacitance
V
IN
= 0V
3.5
6
pF
C
OUT
Output Capacitance
V
OUT
= 0V
3.5
8
pF
CAPACITANCE
(T
A
= +25C, F = 1.0MHz)
NOTE:
1. This parameter is measured at characterization but not tested.
FUNCTION TABLE
(1)
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
Z = High-Impedance
Inputs
xOE
DIR
Outputs
L
L
Bus B Data to Bus A
L
H
Bus A Data to Bus B
H
X
Z
Pin Names
Description
xOE
3-State Output Enable Inputs (Active LOW)
xDIR
Direction Control Input
xAx
Side A Inputs or 3-State Outputs
(1)
xBx
Side A Inputs or 3-State Outputs
(2)
PIN DESCRIPTION
1
DIR
1
B
1
GND
1
B
3
V
CC
GND
2
B
2
GND
V
CC
GND
1
B
2
1
B
4
1
B
5
1
B
6
1
B
7
1
B
8
2
B
1
2
B
3
2
B
4
2
B
5
2
B
7
2
B
8
2
B
6
2
DIR
1
A
1
1
A
2
GND
1
A
3
1
A
4
V
CC
1
A
5
1
A
6
1
A
7
1
A
8
2
A
1
2
A
2
2
A
3
2
A
4
V
CC
2
A
5
2
A
7
2
A
8
2
A
6
GND
GND
GND
2
OE
1
OE
39
29
30
31
32
33
34
35
36
37
38
25
26
27
28
48
47
41
42
43
44
45
46
40
1
2
3
4
5
6
7
8
9
10
12
13
14
15
16
17
18
19
20
11
21
22
23
24
NOTES:
1. This is the 8mA port.
2. This is the +64/-32mA port.
3
IDT74FCT166245T/AT
FAST CMOS 16-BIT BIDIRECTIONAL TRANSCEIVER
INDUSTRIAL TEMPERATURE RANGE
Symbol
Parameter
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Unit
V
IH
Input HIGH Level
Guaranteed Logic HIGH Level
2
--
--
V
V
IL
Input LOW Level
Guaranteed Logic LOW Level
--
--
0.8
V
I
IH
Input HIGH Current (Input pins)
(5)
V
CC
= Max.
V
I
= V
CC
--
--
1
A
Input HIGH Current (I/O pins)
(5)
--
--
1
I
IL
Input LOW Current (Input pins)
(5)
V
I
= GND
--
--
1
Input LOW Current (I/O pins)
(5)
--
--
1
I
OZH
High Impedance Output Current
V
CC
= Max.
V
O
= 2.7V
--
--
1
A
I
OZL
(3-State Output pins)
(5)
V
O
= 0.5V
--
--
1
V
IK
Clamp Diode Voltage
V
CC
= Min., I
IN
= 18mA
--
0.7
1.2
V
I
OS
Short Circuit Current
V
CC
= Max., V
O
= GND
(3)
80
140
250
mA
V
H
Input Hysteresis
--
--
100
--
mV
I
CCL
Quiescent Power Supply Current
V
CC
= Max.
--
5
500
A
I
CCH
V
IN
= GND or V
CC
I
CCZ
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: T
A
= 40C to +85C, V
CC
= 5.0V 10%
NOTES:
1. For conditions shown as Min. or Max., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 5.0V, +25C ambient.
3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second.
4. Duration of the condition can not exceed one second.
5. The test limit for this parameter is 5
A at T
A
= -55C.
Symbol
Parameter
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Unit
I
ODL
Output LOW Current
V
CC
= 5V, V
IN
= V
IH
or V
IL,
V
O
= 1.5V
(3)
16
48
96
mA
I
ODL
Output HIGH Current
V
CC
= 5V, V
IN
= V
IH
or V
IL,
V
O
= 1.5V
(3)
16
48
96
mA
V
OH
Output HIGH Voltage
V
CC
= Min.
I
OH
= 8mA
2.4
3.3
--
V
V
IN
= V
IH
or V
IL
V
OH
Output LOW Voltage
V
CC
= Min.
I
OL
= 8mA
--
0.3
0.55
V
V
IN
= V
IH
or V
IL
OUTPUT DRIVE CHARACTERISTICS (A-PORT)
Symbol
Parameter
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Unit
I
O
Output Drive Current
V
CC
= Max., V
O
= 2.5V
(3)
50
--
180
mA
V
OH
Output HIGH Voltage
V
CC
= Min.
I
OH
= 3mA
2.5
3.5
--
V
IN
= V
IH
or V
IL
I
OH
= 15mA
2.4
3.5
--
V
I
OH
= 32mA
(4)
2
3
--
V
OH
Output LOW Voltage
V
CC
= Min.
I
OL
= 64mA
--
0.2
0.55
V
V
IN
= V
IH
or V
IL
I
OFF
Input/Output Power Off Leakage
V
CC
= 0V, V
IN
or V
O
4.5V
--
--
1
A
OUTPUT DRIVE CHARACTERISTICS (B-PORT)
4
INDUSTRIAL TEMPERATURE RANGE
IDT74FCT166245T/AT
FAST CMOS 16-BIT BIDIRECTIONAL TRANSCEIVER
Symbol
Parameter
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Unit
I
CC
Quiescent Power Supply
V
CC
= Max.
--
0.5
1.5
mA
Current TTL Inputs HIGH
V
IN
= 3.4V
(3)
I
CCD
Dynamic Power Supply Current
(4)
V
CC
= Max.,
V
IN
= V
CC
--
60
100
A/
Outputs Open
V
IN
= GND
MHz
xOE = xDIR = GND
One Input Toggling
50% Duty Cycle
I
C
Total Power Supply Current
(6)
V
CC
= Max.,
V
IN
= V
CC
--
0.6
1.5
mA
Outputs Open
V
IN
= GND
f
i
= 10MHz
50% Duty Cycle
V
IN
= 3.4V
--
0.9
2.3
xOE = xDIR = GND
V
IN
= GND
One Bit Toggling
V
CC
= Max.,
V
IN
= V
CC
--
2.4
4.5
(5)
Outputs Open
V
IN
= GND
fi = 2.5MHz
50% Duty Cycle
V
IN
= 3.4V
--
6.4
16.5
(5)
xOE = xDIR = GND
V
IN
= GND
Sixteen Bits Toggling
POWER SUPPLY CHARACTERISTICS
NOTES:
1. For conditions shown as Min. or Max., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 5.0V, +25C ambient.
3. Per TTL driven input (V
IN
= 3.4V). All other inputs at V
CC
or GND.
4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.
5. Values for these conditions are examples of the I
CC
formula. These limits are guaranteed but not tested.
6. I
C
= I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
= I
CC
+
I
CC
D
H
N
T
+ I
CCD
(f
CP
N
CP
/2 + fiNi)
I
CC
= Quiescent Current (I
CCL
, I
CCH
and I
CCZ
)
I
CC
= Power Supply Current for a TTL High Input (V
IN
= 3.4V)
D
H
= Duty Cycle for TTL Inputs High
N
T
= Number of TTL Inputs at D
H
I
CCD
= Dynamic Current Caused by an Input Transition Pair (HLH or LHL)
f
CP
= Clock Frequency for Register Devices (Zero for Non-Register Devices)
N
CP
= Number of Clock Inputs at f
CP
f
i
= Input Frequency
N
i
= Number of Inputs at f
i
5
IDT74FCT166245T/AT
FAST CMOS 16-BIT BIDIRECTIONAL TRANSCEIVER
INDUSTRIAL TEMPERATURE RANGE
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
FCT166245T
FCT166245AT
Symbol
Parameter
Condition
(1)
Min.
(2)
Max.
Min.
(2)
Max.
Unit
t
PLH
Propagation Delay
C
L
= 50pF
1.5
4.6
1.5
4.1
ns
t
PHL
A to B
R
L
= 500
t
PLH
Propagation Delay
1.5
7
1.5
4.6
ns
t
PHL
B to A
t
PZH
Output Enable Time
1.5
6.2
1.5
5.8
ns
t
PZL
xOE to B
t
PZH
Output Enable Time
1.5
9.5
1.5
6.2
ns
t
PZL
xOE to A
t
PHZ
Output Disable Time
1.5
5
1.5
4.8
ns
t
PLZ
xOE to B
t
PHZ
Output Disable Time
1.5
7.5
1.5
5
ns
t
PLZ
xOE to A
t
PZH
Output Enable Time
1.5
6.2
1.5
5.8
ns
t
PZL
DIR to B
(3)
t
PZH
Output Enable Time
1.5
9.5
1.5
6.2
ns
t
PZL
DIR to A
(3)
t
PHZ
Output Disable Time
1.5
5
1.5
4.8
ns
t
PLZ
DIR to B
(3)
t
PHZ
Output Disable Time
1.5
7.5
1.5
5
ns
t
PLZ
DIR to A
(3)
t
SK(o)
Output Skew
(4)
--
0.5
--
0.5
ns
NOTES:
1. See test circuits and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. This parameter is guaranteed but not tested.
4. Skew between any two outputs of the same package switching in the same direction. This parameter is guaranteed by design.
6
INDUSTRIAL TEMPERATURE RANGE
IDT74FCT166245T/AT
FAST CMOS 16-BIT BIDIRECTIONAL TRANSCEIVER
Pulse
Generator
R
T
D.U.T.
V
CC
V
IN
C
L
V
OUT
50pF
500
500
7.0V
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
D ATA
INPUT
TIM IN G
INPUT
ASYNC HR ONOUS C ONTROL
PRES ET
CLEA R
ETC .
SYNCHR ON OUS CONTROL
t
SU
t
H
t
R EM
t
SU
t
H
PRES ET
CLEA R
CLOCK ENABLE
ETC .
HIGH-LOW -H IGH
PU LSE
LOW -HIGH-LOW
PU LSE
t
W
1.5V
1.5V
SAM E PHASE
INPUT TRAN SITION
3V
1.5V
0V
1.5V
V
O H
t
PLH
OU TPU T
OPPOSITE P HASE
INPUT TRAN SITION
3V
1.5V
0V
t
PL H
t
PH L
t
PH L
V
O L
CONTROL
IN PU T
3V
1.5V
0V
3.5V
0V
OUTPU T
NORM ALLY
LOW
OUTPU T
NORM ALLY
H IGH
SW ITCH
C LOSE D
SW ITC H
OPEN
V
OL
0.3V
0.3V
t
PLZ
t
PZL
t
PZH
t
PHZ
3.5V
0V
1.5V
1.5V
ENABLE
D ISABLE
V
OH
TEST CIRCUITS AND WAVEFORMS
Propagation Delay
Test Circuits for All Outputs
Enable and Disable Times
Set-up, Hold, and Release Times
Pulse Width
NOTES:
1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH.
2. Pulse Generator for All Pulses: Rate
1.0MHz; t
F
2.5ns; t
R
2.5ns.
Test
Switch
Open Drain
Disable Low
Closed
Enable Low
All Other Tests
Open
SWITCH POSITION
DEFINITIONS:
C
L
= Load capacitance: includes jig and probe capacitance.
R
T
= Termination resistance: should be equal to Z
OUT
of the Pulse Generator.
7
IDT74FCT166245T/AT
FAST CMOS 16-BIT BIDIRECTIONAL TRANSCEIVER
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDT XX
Temp. Range
FCT
XXX
Drive
XXXX
Device Type
XX
Package
PV
PA
245T
245AT
Shrink Small Outline Package
Thin Shrink Small Outline Package
16-Bit Bidirectional Transceiver
74
40
C to +85
C
166
Double-Density, 5 Volt, Light Drive
CORPORATE HEADQUARTERS
for SALES:
for Tech Support:
2975 Stender Way
800-345-7015 or 408-727-6116
logichelp@idt.com
Santa Clara, CA 95054
fax: 408-492-8674
(408) 654-6459
www.idt.com
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