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M74HCT157B1R

P1-P3P4-P6P7-P9
1/9September 2001
■ HIGH SPEED:
t
PD
= 16ns (TYP.) at V
CC
= 4.5V
■ LOW POWER DISSIPATION:
I
CC
= 4µA(MAX.) at T
A
=25°C
■ COMPATIBLE WITH TTL OUTPUTS :
V
IH
= 2V (MIN.) V
IL
= 0.8V (MAX)
■ SYMMETRICAL OUTPUT IMPEDANCE:
|I
OH
| = I
OL
= 4mA (MIN)
■ BALANCED PROPAGATION DELAYS:
t
PLH
≅ t
PHL
■ PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 157
DESCRIPTION
The M74HCT157 is an high speed CMOS QUAD
2 CHANNEL MULTIPLEXER fabricated with
silicon gate C
2
MOS technology.
This device consists of four 2-input digital
multiplexer with common select and strobe inputs.
When the STROBE
(ST) 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.
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
M74HCT157
QUAD 2 CHANNEL MULTIPLEXER
PIN CONNECTION AND IEC LOGIC SYMBOLS
ORDER CODES
PACKAGE TUBE T & R
DIP M74HCT157B1R
SOP M74HCT157M1R M74HCT157RM13TR
TSSOP M74HCT157TTR
TSSOPDIP SOP
Obsolete Product(s) - Obsolete Product(s)
M74HCT157
2/9
INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
TRUTH TABLE
X : Don’t Care
LOGIC DIAGRAM
PIN No SYMBOL NAME AND FUNCTION
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 Output
15 STROBE
Strobe Inputs
8 GND Ground (0V)
16 V
CC
Positive Supply Voltage
INPUTS OUTPUTS
STROBE
SELECT A B Y
HXXXL
LLLXL
LLHXH
LHXLL
LHXHH
Obsolete Product(s) - Obsolete Product(s)
M74HCT157
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
(*) 500mW at 65
°C; derate to 300mW by 10mW/°C from 65°C to 85°C
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Value Unit
V
CC
Supply Voltage
-0.5 to +7 V
V
I
DC Input Voltage -0.5 to V
CC
+ 0.5
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
± 50 mA
P
D
Power Dissipation
500(*) mW
T
stg
Storage Temperature
-65 to +150 °C
T
L
Lead Temperature (10 sec)
300 °C
Symbol Parameter Value Unit
V
CC
Supply Voltage
4.5 to 5.5 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
t
r
, t
f
Input Rise and Fall Time (V
CC
= 4.5 to 5.5V)
0 to 500 ns
Obsolete Product(s) - Obsolete Product(s)
P1-P3P4-P6P7-P9

M74HCT157B1R

Mfr. #:
Buy M74HCT157B1R
Manufacturer:
STMicroelectronics
Description:
IC MULTIPLEXER QUAD 2CHAN 16-DIP
Lifecycle:
New from this manufacturer.
Delivery:
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