器件名称:
M74HCT157_01
功能描述:
QUAD 2 CHANNEL MULTIPLEXER
文件大小:
249.32KB 共9页
简 介:
M74HCT157 QUAD 2 CHANNEL MULTIPLEXER s s s s s s 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……
