M74HC257
M74HC257 is QUAD 2 CHANNEL MULTIPLEXER manufactured by STMicroelectronics.
DESCRIPTION
PIN No
SYMBOL NAME AND FUNCTION
SELECT mon Data Select Input
2, 5, 14, 11 1A to 4A Data Input From Source A
3, 6, 13, 10 1B to 4B Data Input From Source B
4, 7, 12, 9
1Y to 4Y
3 State Multiplexer Outputs
3 State Output Enable Inputs (Active Low) t(s)TRUTH TABLE roduc OE PH te L le L o L s L b X : Don’t Care OZ : High Impedance Obsolete Product(s) -LOGIC DIAGRAM
8 16
INPUTS
SELECT
X L L H H
X L H X X
GND Vcc
Ground (0V) Positive Supply Voltage
OUTPUT
XZ XL XH LL HH
This logic diagram has not be used to estimate propagation delays
2/11
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
VCC Supply Voltage
-0.5 to +7
VI DC Input Voltage
-0.5 to VCC + 0.5
VO DC Output Voltage
-0.5 to VCC + 0.5
IIK DC Input Diode...
