1/9
September 2001
s
5V TOLERANT INPUTS AND OUTPUTS
s
HIGH SPEED :
t
PD
= 4.5 ns (MAX.) at V
CC
= 3V
s
POWER DOWN PROTECTION ON INPUTS
AND OUTPUTS
s
SYMMETRICAL OUTPUT IMPEDANCE:
|I
OH
| = I
OL
= 24mA (MIN) at V
CC
= 3V
s
PCI BUS LEVELS GUARANTEED AT 24 mA
s
BALANCED PROPAGATION DELAYS:
t
PLH
t
PHL
s
OPERATING VOLTAGE RANGE:
V
CC
(OPR) = 2.0V to 3.6V (1.5V Data
Retention)
s
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 16245
s
LATCH-UP PERFORMANCE EXCEEDS
500mA (JESD 17)
s
ESD PERFORMANCE:
HBM > 2000V (MIL STD 883 method 3015);
MM > 200V
DESCRIPTION
The 74LCX16245 is a low voltage CMOS 16 BIT
BUS TRANSCEIVER (3-STATE) fabricated with
sub-micron silicon gate and double-layer metal
wiring C
2
MOS technology. It is ideal for low power
and high speed 3.3V applications; it can be
interfaced to 5V signal environment for both inputs
and outputs.
This IC is intended for two-way asynchronous
communication between data buses; the direction
of data transmission is determined by DIR input.
The two enable inputs nG can be used to disable
the device so that the buses are effectively isolat-
ed.
It has same speed performance at 3.3V than 5V
AC/ACT family, combined with a lower power con-
sumption.
All inputs and outputs are equipped with protec-
tion circuits against static discharge, giving them
2KV ESD immunity and transient excess voltage.
All floating bus terminals during High Z State must
be held HIGH or LOW.
74LCX16245
LOW VOLTAGE CMOS 16-BIT BUS TRANSCEIVER
WITH 5V TOLERANT INPUTS AND OUTPUT (3-STATE)
ORDER CODES
PACKAGE
TUBE
T & R
TSSOP
74LCX16245TTR
TSSOP
PIN CONNECTION
74LCX16245
2/9
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
TRUTH TABLE
X : Don`t Care
Z : High Impedance
IEC LOGIC SYMBOLS
PIN No
SYMBOL
NAME AND FUNCTION
1
1DIR
Directional Control
2, 3, 5, 6, 8, 9,
11, 12
1B1 to 1B8 Data Inputs/Outputs
13, 14, 16, 17,
19, 20, 22, 23
2B1 to 2B8 Data Inputs/Outputs
24
2DIR
Directional Control
25
2G
Output Enable Input
36, 35, 33, 32,
30, 29, 27, 26
2A1 to 2A8 Data Inputs/Outputs
47, 46, 44, 43,
41, 40, 38, 38
1A1 to 1A8 Data Inputs/Outputs
48
1G
Output Enable Input
4, 10, 15, 21,
28, 34, 39, 45
GND
Ground (0V)
7, 18, 31, 42
V
CC
Positive Supply Voltage
INPUTS
FUNCTION
OUTPUT
G
DIR
A BUS
B BUS
Yn
L
L
OUTPUT
INPUT
A = B
L
H
INPUT
OUTPUT
B = A
H
X
Z
Z
Z
74LCX16245
3/9
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
1) I
O
absolute maximum rating must be observed
2) V
O
< GND
RECOMMENDED OPERATING CONDITIONS
1) Truth Table guaranteed: 1.5V to 3.6V
2) V
IN
from 0.8V to 2V at V
CC
= 3.0V
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
-0.5 to +7.0
V
V
I
DC Input Voltage (DIR, G)
-0.5 to +7.0
V
V
I/O
Bus I/O Voltage (OFF State)
-0.5 to +7.0
V
V
I/O
Bus I/O Voltage (High or Low State) (note 1)
-0.5 to V
CC
+ 0.5
V
I
IK
DC Input Diode Current
- 50
mA
I
OK
DC Output Diode Current (note 2)
- 50
mA
I
O
DC Output Current
50
mA
I
CC
DC Supply Current per Supply Pin
100
mA
I
GND
DC Ground Current per Supply Pin
100
mA
T
stg
Storage Temperature
-65 to +150
C
T
L
Lead Temperature (10 sec)
300
C
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage (note 1)
2.0 to 3.6
V
V
I
Input Voltage
0 to 5.5
V
V
O
Output Voltage (OFF State)
0 to 5.5
V
V
O
Output Voltage (High or Low State)
0 to V
CC
V
I
OH
, I
OL
High or Low Level Output Current (V
CC
= 3.0 to 3.6V)
24
mA
I
OH
, I
OL
High or Low Level Output Current (V
CC
= 2.7V)
12
mA
T
op
Operating Temperature
-55 to 125
C
dt/dv
Input Rise and Fall Time (note 2)
0 to 10
ns/V
74LCX16245
4/9
DC SPECIFICATIONS
DYNAMIC SWITCHING CHARACTERISTICS
1) Number of outputs defined as "n". Measured with "n-1" outputs switching from HIGH to LOW or LOW to HIGH. The remaining output is
measured in the LOW state.
Symbol
Parameter
Test Condition
Value
Unit
V
CC
(V)
-40 to 85
C
-55 to 125
C
Min.
Max.
Min.
Max.
V
IH
High Level Input
Voltage
2.7 to 3.6
2.0
2.0
V
V
IL
Low Level Input
Voltage
0.8
0.8
V
V
OH
High Level Output
Voltage
2.7 to 3.6
I
O
=-100
A
V
CC
-0.2
V
CC
-0.2
V
2.7
I
O
=-12 mA
2.2
2.2
3.0
I
O
=-18 mA
2.4
2.4
I
O
=-24 mA
2.2
2.2
V
OL
Low Level Output
Voltage
2.7 to 3.6
I
O
=100
A
0.2
0.2
V
2.7
I
O
=12 mA
0.4
0.4
3.0
I
O
=16 mA
0.4
0.4
I
O
=24 mA
0.55
0.55
I
I
Input Leakage
Current
2.7 to 3.6
V
I
= 0 to 5.5V
5
5
A
I
off
Power Off Leakage
Current
0
V
I
or V
O
= 5.5V
10
10
A
I
OZ
High Impedance
Output Leakage
Current
2.7 to 3.6
V
I
= V
IH
or V
IL
V
O
= 0 to V
CC
5
5
A
I
CC
Quiescent Supply
Current
2.7 to 3.6
V
I
= V
CC
or GND
20
20
A
V
I
or V
O
= 3.6 to 5.5V
20
20
I
CC
I
CC
incr. per Input
2.7 to 3.6
V
IH
= V
CC
- 0.6V
500
500
A
Symbol
Parameter
Test Condition
Value
Unit
V
CC
(V)
T
A
= 25
C
Min.
Typ.
Max.
V
OLP
Dynamic Low Level Quiet
Output (note 1)
3.3
C
L
= 50pF
V
IL
= 0V, V
IH
= 3.3V
0.8
V
V
OLV
-0.8
74LCX16245
5/9
AC ELECTRICAL CHARACTERISTICS
1) Skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs of the same device switch-
ing in the same direction, either HIGH or LOW (t
OSLH
= | t
PLHm
- t
PLHn
|, t
OSHL
= | t
PHLm
- t
PHLn
|)
2) Parameter guaranteed by design
CAPACITIVE CHARACTERISTICS
1) C
PD
is defined as the value of the IC's internal equivalent capacitance which is calculated from the operating current consumption without
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. I
CC(opr)
= C
PD
x V
CC
x f
IN
+ I
CC
/16 (per
circuit)
Symbol
Parameter
Test Conditi on
Value
Unit
V
CC
(V)
C
L
(pF)
R
L
(
)
t
s
= t
r
(ns)
-40 to 85
C
-55 to 125
C
Min.
Max.
Min.
Max.
t
PLH
t
PHL
Propagation Delay
Time
2.7
50
500
2.5
1.5
5.2
1.5
5.2
ns
3.0 to 3.6
1.5
4.5
1.5
4.5
t
PZL
t
PZH
Output Enable Time
2.7
50
500
2.5
1.5
7.2
1.5
7.2
ns
3.0 to 3.6
1.5
6.5
1.5
6.5
t
PLZ
t
PHZ
Output Disable Time
2.7
50
500
2.5
1.5
6.9
1.5
6.9
ns
3.0 to 3.6
1.5
6.4
1.5
6.4
t
OSLH
t
OSHL
Output To Output
Skew Time (note1,
2)
3.0 to 3.6
50
500
2.5
1.0
1.0
ns
Symbol
Parameter
Test Condition
Value
Unit
V
CC
(V)
T
A
= 25
C
Min.
Typ.
Max.
C
IN
Input Capacitance
3.3
V
IN
= 0 to V
CC
7
pF
C
OUT
Output Capacitance
3.3
V
IN
= 0 to V
CC
8
pF
C
PD
Power Dissipation Capacitance
(note 1)
3.3
f
IN
= 10MHz
V
IN
= 0 or V
CC
20
pF
74LCX16245
6/9
TEST CIRCUIT
C
L
= 50 pF or equivalent (includes jig and probe capacitance)
R
L
= R1 = 500
or equivalent
R
T
= Z
OUT
of pulse generator (typically 50
)
WAVEFORM 1 : PROPAGATION DELAYS (f=1MHz; 50% duty cycle)
TEST
SWIT CH
t
PLH
, t
PHL
Open
t
PZL
, t
PLZ
6V
t
PZH
, t
PHZ
GND
74LCX16245
7/9
WAVEFORM 2 : OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle)
74LCX16245
8/9
DIM.
mm.
inch
MIN.
TYP
MAX.
MIN.
TYP.
MAX.
A
1.1
0.043
A1
0.05
0.15
0.002
0.006
A2
0.9
0.035
b
0.17
0.27
0.0067
0.011
c
0.09
0.20
0.0035
0.0079
D
12.4
12.6
0.408
0.496
E
7.95
8.25
0.313
0.325
E1
6.0
6.2
0.236
0.244
e
0.5 BSC
0.0197 BSC
K
0
8
0
8
L
0.50
0.75
0.020
0.030
TSSOP48 MECHANICAL DATA
c
E
b
A2
A
E1
D
1
PIN 1 IDENTIFICATION
A1
L
K
e
7065588A
74LCX16245
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use of such inform ation nor for any infringe ment of patents or other righ ts of third parties which may result from
its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this pub lication are subject to change without notice. Thi s pub lication supersedes and replaces all information
previously supplied. STMicroelectronics prod ucts are not authori zed for use as critical components in life suppo rt devices or
systems without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics
2001 STMicroelectronics - Printed in Italy - All Rights Reserved
STMicroelectronics GROUP OF COMPANIES
Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco
Singapore - Spain - Sweden - Swit zerland - United Kingdom
http://w ww.st.com
9/9
PDF 
ZIP