IN74HC157A
TECHNICAL DATA
Quad 2-Input Data Selectors/Multiplexer
The IN74HC157A is identical in pin out to the LS/ALS157. The device inputs are patible with standard CMOS outputs; with pull up resistors, they are patible with LS/ALSTTL outputs. This device routes 2 nibbles (A or B) to a single port (Y) as determined by the Select input. The data is presented at the outputs in non inverted form. A high level on the Output Enable input sets all four Y outputs to a low level.
- Outputs Directly Interface to CMOS, NMOS, and TTL
- Operating Voltage Range: 2.0 to 6.0 V
- Low Input Current: 1.0 µA
- High Noise Immunity Characteristic of CMOS Devices
ORDERING INFORMATION IN74HC157AN Plastic IN74HC157AD SOIC TA = -55° to 125° C for all packages
PIN ASSIGNMENT LOGIC DIAGRAM
FUNCTION TABLE
Inputs Output Enable PIN 16 =VCC PIN 8 = GND Select X L H Outputs Y0-Y3 L A0-A3 B0-B3 w w w
.d e e h s a t a
. u t4 m o c
X=don’t care A0-A3, B0-B3=the levels of the respective Data-Word...
