STMICROELECTRONICS 74VHCT157

74VHCT157A

QUAD 2 CHANNEL MULTIPLEXER
PRELIMINARY DATA
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HIGH SPEED: tPD = 6.2 ns (TYP.) at VCC = 5V
LOW POWER DISSIPATION:
ICC = 4 µA (MAX.) at TA = 25 oC
COMPATIBLE WITH TTL OUTPUTS:
VIH = 2V (MIN), VIL = 0.8V (MAX)
POWER DOWN PROTECTION ON INPUTS &
OUTPUTS
SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 8 mA (MIN)
BALANCED PROPAGATION DELAYS:
tPLH ≅ tPHL
OPERATING VOLTAGE RANGE:
VCC (OPR) = 4.5V to 5.5V
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 157
IMPROVED LATCH-UP IMMUNITY
LOW NOISE: VOLP = 0.8V (Max.)
DESCRIPTION
The 74VHCT157A is an high-speed CMOS
QUAD 2-CHANNEL MULTIPLEXER fabricated
with sub-micron silicon gate and double-layer
metal wiring C2MOS technology.
It consists of four 2-input digital multiplexers with
common select and strobe inputs. It is a
SOP
TSSOP
ORDER CODES
PACKAGE
T UBE
T& R
SOP
74VHCT157AM
74VHCT157AMTR
TSSOP
74VHCT157ATTR
non-inverting multiplexer. When the STROBE
input is held high, selection of data is inhibited
and all the outputs become low. The SELECT
decoding determines whether the A or B inputs
get routed to their corresponding Y outputs.
Power down protection is provided on all inputs
and outputs and 0 to 7V can be accepted on
inputs with no regard to the supply voltage. This
device can be used to interface 5V to 3V.All
inputs and outputs are equipped with protection
circuits against static discharge, giving them 2KV
ESD immunity and transient excess voltage.
PIN CONNECTION AND IEC LOGIC SYMBOLS
March 2000
1/9
74VHCT157A
INPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
SYMBOL
NAME AND FUNCT ION
1
SELECT
Common Data Select Input
2, 5, 11, 14
1A to 4A
Data Inputs From
Source A
3, 6, 10, 13
1B to 4B
Data Inputs From
Source B
4, 7,9, 12
1Y to 4Y
Multiplexer Outputs
15
STROBE
Strobe Input
8
GND
Ground (0V)
16
VCC
Positive Supply Voltage
TRUTH TABLE
INPUT
SELE CT
A
B
Y
H
X
X
X
L
L
L
L
X
L
L
L
H
X
H
L
H
X
L
L
L
H
X
H
H
X:”H” or ”L”
LOGIC DIAGRAM
2/9
OUT PUT
STROBE
74VHCT157A
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Supply Voltage
VCC
Value
Unit
-0.5 to +7.0
V
VI
DC Input Voltage
-0.5 to +7.0
V
VO
DC Output Voltage (see note 1)
-0.5 to +7.0
V
VO
DC Output Voltage (see note 2)
-0.5 to VCC + 0.5
V
IIK
DC Input Diode Current
- 20
mA
IOK
DC Output Diode Current
± 20
mA
IO
DC Output Current
± 25
mA
± 50
mA
ICC orIGND
Tstg
TL
DC VCC or Ground Current
Storage Temperature
-65 to +150
o
300
o
Lead Temperature (10 sec)
C
C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
1) VCC=0
2) High or Low State
RECOMMENDED OPERATING CONDITIONS
Symbol
VCC
Parameter
Supply Voltage
Valu e
Unit
4.5 to 5.5
V
VI
Input Voltage
0 to 5.5
V
VO
Output Voltage (see note 1)
0 to 5.5
V
VO
Output Voltage (see note 2)
Top
Operating Temperature
dt/dv
0 to VCC
V
o
-40 to +85
Input Rise and Fall Time (see note 3) (V CC = 5.0 ± 0.5V)
C
0 to 20
ns/V
1) VCC=0
2) High or Low State
3)VIN from0.8V to 2 V
DC SPECIFICATIONS
Symb ol
Parameter
T est Cond ition s
Min.
2
VIH
High Level Input
Voltage
4.5 to 5.5
VIL
Low Level Input
Voltage
4.5 to 5.5
VOH
High Level Output
Voltage
VOL
Low Level Output
Voltage
Value
T A = 25 o C
V CC
(V)
Typ .
Un it
-40 to 85 o C
Max.
Min .
0.8
4.5
IO=-50 µA
4.4
4.5
IO=-8 mA
3.94
4.5
IO=50 µA
4.5
Max.
2
4.5
V
0.8
4.4
V
3.8
0.0
V
0.1
0.1
IO=8 mA
0.36
0.44
V
0 to 5.5
VI = 5.5V or GND
±0.1
±1.0
µA
ICC
Quiescent Supply
Current
5.5
VI = VCC orGND
4
40
µA
∆ICC
Additional Worst Case
Supply Current
5.5
One Input at 3.4V,
other input at VCC or
GND
1.35
1.5
mA
IOPD
Output Leakage
Current
0
VOUT = 5.5V
0.5
5.0
µA
II
Input Leakage Current
3/9
74VHCT157A
AC ELECTRICAL CHARACTERISTICS (Input t r = tf =3 ns)
Symb ol
Parameter
5.0(*)
15
Value
T A = 25 o C
Min. Typ . Max.
6.2
9.7
5.0(*)
50
8.7
13.2
1.0
15.0
5.0(*)
15
8.4
13.2
1.0
15.5
5.0
(*)
50
10.9
16.7
1.0
19.0
ns
5.0(*)
5.0(*)
15
50
8.7
11.2
13.6
17.1
1.0
1.0
16.0
19.5
ns
V CC
(V)
tPLH
tPHL
Propagation Delay
Time
A, B to Y
tPLH
tPHL
Propagation Delay
Time
SELECT to Y
tPLH
tPHL
Propagation Delay
Time
STROBE to Y
Test Co ndition
CL
(pF )
Un it
-40 to 85 o C
Min . Max.
1.0
11.5
ns
(*) Voltage range is 5V ± 0.5V
CAPACITIVE CHARACTERISTICS
Symb ol
Parameter
T est Cond ition s
Value
o
Min.
Un it
o
T A = 25 C
-40 to 85 C
Typ .
Max.
CIN
Input Capacitance
4
10
CPD
Power Dissipation
Capacitance (note 1)
20
Min .
Max.
10
pF
pF
1) CPD isdefined as the value of the IC’sinternal equivalent capacitance which is calculated fromthe operating current consumption without load. (Referto
Test Circuit).Average operating current can be obtained by the following equation. ICC(opr) = CPD • VCC • fIN + ICC/4 (per Channel)
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74VHCT157A
DYNAMIC SWITCHING CHARACTERISTICS
Symb ol
Parameter
T est Cond ition s
Dynamic Low Voltage
Quiet Output (note 1, 2)
5.0
VIHD
Dynamic High Voltage
Input (note 1, 3)
5.0
VILD
Dynamic Low Voltage
Input (note 1, 3)
5.0
VOLP
VOLV
Value
T A = 25 o C
V CC
(V)
Min.
-0.8
CL = 50 pF
Un it
-40 to 85 o C
Typ .
Max.
0.3
0.8
Min .
Max.
-0.3
2.0
V
0.8
1) Worst case package.
2) Max number of outputs defined as (n). Data inputs are driven 0V to 5.0V, (n -1) outputs switching and one output at GND.
3) Max number of data inputs (n) switching. (n-1) switching 0V to5.0V. Inputs under test switching: 5.0V to threshold (VILD), 0V to threshold (VIHD), f=1MHz.
TEST CIRCUIT
CL = 15/50 pF or equivalent (includes jig and probe capacitance)
RT = ZOUT of pulse generator (typically 50Ω)
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74VHCT157A
WAVEFORM 1: PROPAGATION DELAYS FOR INVERTING CONDITIONS
WAVEFORM 2: PROPAGATION DELAYS FOR NON-INVERTING CONDITIONS
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74VHCT157A
SO-16 MECHANICAL DATA
mm
DIM.
MIN.
TYP.
A
a1
inch
MAX.
MIN.
TYP.
1.75
0.1
0.068
0.2
a2
MAX.
0.004
0.007
1.65
0.064
b
0.35
0.46
0.013
0.018
b1
0.19
0.25
0.007
0.010
C
0.5
0.019
c1
45 (typ.)
D
9.8
10
0.385
0.393
E
5.8
6.2
0.228
0.244
e
1.27
e3
0.050
8.89
0.350
F
3.8
4.0
0.149
0.157
G
4.6
5.3
0.181
0.208
L
0.5
1.27
0.019
0.050
M
S
0.62
0.024
8 (max.)
P013H
7/9
74VHCT157A
TSSOP16 MECHANICAL DATA
mm
DIM.
MIN.
inch
TYP.
A
MAX.
MIN.
MAX.
1.1
0.433
A1
0.05
0.10
0.15
0.002
0.004
0.006
A2
0.85
0.9
0.95
0.335
0.354
0.374
b
0.19
0.30
0.0075
0.0118
c
0.09
0.20
0.0035
0.0079
D
4.9
5
5.1
0.193
0.197
0.201
E
6.25
6.4
6.5
0.246
0.252
0.256
E1
4.3
4.4
4.48
0.169
0.173
0.176
e
0.65 BSC
0.0256 BSC
K
0o
4o
8o
0o
4o
8o
L
0.50
0.60
0.70
0.020
0.024
0.028
A
A2
A1
b
e
K
c
E1
PIN 1 IDENTIFICATION
1
L
E
D
8/9
TYP.
74VHCT157A
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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. Specification 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 withoutexpress written approval of STMicroelectronics.
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