器件名称: M74HCT157
功能描述: QUAD 2 CHANNEL MULTIPLEXER
文件大小: 249.32KB 共9页
简 介:M74HCT157
QUAD 2 CHANNEL MULTIPLEXER
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HIGH SPEED: tPD = 16ns (TYP.) at VCC = 4.5V LOW POWER DISSIPATION: ICC = 4A(MAX.) at TA=25°C COMPATIBLE WITH TTL OUTPUTS : VIH = 2V (MIN.) VIL = 0.8V (MAX) SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 4mA (MIN) BALANCED PROPAGATION DELAYS: tPLH tPHL PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 157
DIP
SOP
TSSOP
ORDER CODES
PACKAGE DIP SOP TSSOP TUBE M74HCT157B1R M74HCT157M1R T&R M74HCT157RM13TR M74HCT157TTR
DESCRIPTION The M74HCT157 is an high speed CMOS QUAD 2 CHANNEL MULTIPLEXER fabricated with silicon gate C2MOS 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.
PIN CONNECTION AND IEC LOGIC SYMBOLS
September 2001
1/9
M74HCT157
INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
PIN No 1 2, 5, 11, 14 3, 6, 10, 13 4, 7, 9, 12 15 8 16 SYMBOL SELECT 1A to 4A 1B to 4B 1Y to 4Y STROBE GND VCC NAME AND FUNCTION Common Data Select Input Data Inputs From Source A Data Inputs From Source B Multiplexer Output Strobe Inputs Ground (0V) Positive Supply Voltage
TRUTH TABLE
INPUTS STROBE H L L L L
X : Don’t Care
OUTPUTS A X L H X X B X X X L H Y L L H L H
SELECT X……