1/9
July 2003
s
HIGH SPEED:
t
PD
= 4.5 ns (TYP.) at V
CC
= 5V
s
LOW POWER DISSIPATION:
I
CC
= 4
A (MAX.) at T
A
=25C
s
HIGH NOISE IMMUNITY:
V
NIH
= V
NIL
= 28% V
CC
(MIN.)
s
POWER DOWN PROTECTION ON INPUTS
s
SYMMETRICAL OUTPUT IMPEDANCE:
|I
OH
| = I
OL
= 24 mA (MIN)
s
BALANCED PROPAGATION DELAYS:
t
PLH
t
PHL
s
OPERATING VOLTAGE RANGE:
V
CC
(OPR) = 2V to 6V
s
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 16245
s
IMPROVED LATCH-UP IMMUNITY
DESCRIPTION
The 74AC16245 is an advanced high-speed
CMOS 16-BIT BUS TRANSCEIVER (3-STATE)
fabricated with sub-micron silicon gate and dou-
ble-layer metal wiring C
2
MOS technology.
This IC is intended for two-way asynchronous
communication
between
data
busses;
the
direction of data transmission is determined by
DIR input. The enable input G can be used to
disable the device so that the busses are
effectively isolated.
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.
74AC16245
16-BIT BUS TRANSCEIVER
WITH 3-STATE OUTPUTS (NON INVERTED)
ORDER CODES
PACKAGE
TUBE
T & R
TSSOP
74AC16245TTR
TSSOP
PIN CONNECTION
74AC16245
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
74AC16245
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
RECOMMENDED OPERATING CONDITIONS
1) V
IN
from 30% to 70% of V
CC
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
-0.5 to +7.0
V
V
I
DC Input Voltage
-0.5 to +7.0
V
V
O
DC Output Voltage
-0.5 to V
CC
+ 0.5
V
I
IK
DC Input Diode Current
20
mA
I
OK
DC Output Diode Current
20
mA
I
O
DC Output Current
25
mA
I
CC
or I
GND
DC V
CC
or Ground Current
200
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
2 to 6
V
V
I
Input Voltage
0 to V
CC
V
V
O
Output Voltage
0 to V
CC
V
T
op
Operating Temperature
-55 to 125
C
dt/dv
Input Rise and Fall Time (note 1) V
CC
= 3.0, 4.5 or 5.5
0 to 8
ns/V
74AC16245
4/9
DC SPECIFICATIONS
AC ELECTRICAL CHARACTERISTICS (C
L
= 50 pF, R
L
= 500
, Input t
r
= t
f
= 3ns)
(*) Voltage range is 3.3V
0.3V
(**) Voltage range is 5.0V
0.5V
Symbol
Parameter
Test Condition
Value
Unit
V
CC
(V)
T
A
= 25 C
-40 to 85C
-55 to 125C
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
V
IH
High Level Input
Voltage
3.0
V
O
= 0.1 V or
V
CC
-0.1V
2.1
1.5
2.1
2.1
V
4.5
3.15
2.25
3.15
3.15
5.5
3.85
2.75
3.85
3.85
V
IL
Low Level Input
Voltage
3.0
V
O
= 0.1 V or
V
CC
-0.1V
1.5
0.9
0.9
0.9
V
4.5
2.25
1.35
1.35
1.35
5.5
2.75
1.65
1.65
1.65
V
OH
High Level Output
Voltage
3.0
I
O
=-50
A
2.9
2.99
2.9
2.9
V
4.5
I
O
=-50
A
4.4
4.49
4.4
4.4
5.5
I
O
=-50
A
5.4
5.49
5.4
5.4
3.0
I
O
=-12 mA
2.56
2.46
2.46
4.5
I
O
=-24 mA
3.86
3.76
3.76
5.5
I
O
=-24 mA
4.86
4.76
4.76
V
OL
Low Level Output
Voltage
3.0
I
O
=50
A
0.002
0.1
0.1
0.1
V
4.5
I
O
=50
A
0.001
0.1
0.1
0.1
5.5
I
O
=50
A
0.001
0.1
0.1
0.1
3.0
I
O
=12 mA
0.36
0.44
0.44
4.5
I
O
=24 mA
0.36
0.44
0.44
I
I
Input Leakage
Current
5.5
V
I
= V
CC
or GND
0.1
1
1
A
I
OZ
High Impedance
Output Leakage
Current
5.5
V
I
= V
IH
or V
IL
V
O
= V
CC
or GND
0.5
5
5
A
I
CC
Quiescent Supply
Current
5.5
V
I
= V
CC
or GND
4
40
40
A
Symbol
Parameter
Test Condition
Value
Unit
V
CC
(V)
C
L
(pF)
T
A
= 25C
-40 to 85C
-55 to 125C
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
t
PLH
t
PHL
Propagation Delay
Time
3.3
(*)
6
6.3
8.5
9.0
ns
5.0
(**)
4.5
5.0
6.5
7.5
t
PZL
t
PZH
Output Enable
Time
3.3
(*)
8
8.5
11.0
12.0
ns
5.0
(**)
5.5
6.0
7.0
8.0
t
PLZ
t
PHZ
Output Disable
Time
3.3
(*)
7.5
8.0
9.3
10.0
ns
5.0
(**)
5.7
6.0
7.0
8.0
74AC16245
5/9
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
Latch)
TEST CIRCUIT
C
L
= 50 pF or equivalent (includes jig and probe capacitance)
R
L
= R1 = 1K
or equivalent
R
T
= Z
OUT
of pulse generator (typically 50
)
Symbol
Parameter
Test Condition
Value
Unit
V
CC
(V)
T
A
= 25C
-40 to 85C
-55 to 125C
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
C
IN
Input Capacitance
7
10
10
10
pF
C
I/O
Input Output
Capacitance
14
pF
C
PD
Power Dissipation
Capacitance
(note 1)
5.0
f
IN
= 10MHz
25
pF
TEST
SWITCH
t
PLH
, t
PHL
Open
t
PZL
, t
PLZ
2V
CC
t
PZH
, t
PHZ
GND
74AC16245
6/9
WAVEFORM 1: PROPAGATION DELAYS (f=1MHz; 50% duty cycle)
WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle)
74AC16245
7/9
DIM.
mm.
inch
MIN.
TYP
MAX.
MIN.
TYP.
MAX.
A
1.2
0.047
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
0.488
0.496
E
8.1 BSC
0.318 BSC
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
7065588C
74AC16245
8/9
DIM.
mm.
inch
MIN.
TYP
MAX.
MIN.
TYP.
MAX.
A
330
12.992
C
12.8
13.2
0.504
0.519
D
20.2
0.795
N
60
2.362
T
30.4
1.197
Ao
8.7
8.9
0.343
0.350
Bo
13.1
13.3
0.516
0.524
Ko
1.5
1.7
0.059
0.067
Po
3.9
4.1
0.153
0.161
P
11.9
12.1
0.468
0.476
Tape & Reel TSSOP48 MECHANICAL DATA
74AC16245
9/9
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights 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 publication are subject to change without notice. This publication supersedes and replaces all information
previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of STMicroelectronics.
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