M74HCT157RM13TR STMicroelectronics

M74HCT157 QUAD 2 CHANNEL MULTIPLEXER HIGH SPEED: t = 16ns (TYP.) at V = 4.5V PD CC LOW POWER DISSIPATION: I = 4A(MAX.) at T =25C CC A COMPATIBLE WITH TTL OUTPUTS : V = 2V (MIN.) V = 0.8V (MAX) IH IL DIP SOP TSSOP SYMMETRICAL OUTPUT IMPEDANCE: I = I = 4mA (MIN) OH OL BALANCED PROPAGATION DELAYS: t t PLH PHL ORDER CODES PIN AND FUNCTION COMPATIBLE WITH PACKAGE TUBE T & R 74 SERIES 157 DIP M74HCT157B1R SOP M74HCT157M1R M74HCT157RM13TR DESCRIPTION TSSOP M74HCT157TTR The M74HCT157 is an high speed CMOS QUAD 2 CHANNEL MULTIPLEXER fabricated with 2 silicon gate C MOS technology. whether the A or B inputs get routed to their This device consists of four 2-input digital corresponding Y outputs. multiplexer with common select and strobe inputs. All inputs are equipped with protection circuits When the STROBE(ST) input is held high, against static discharge and transient excess selection of data is inhibited and all the outputs voltage. become low. The SELECT decoding determines PIN CONNECTION AND IEC LOGIC SYMBOLS September 2001 1/9 Obsolete Product(s) - Obsolete Product(s)M74HCT157 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION 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 Positive Supply Voltage CC TRUTH TABLE INPUTS OUTPUTS STROBE SELECT A B Y HX XX L LLL X L LL H X H LH X L L LH X H H X : Dont Care LOGIC DIAGRAM 2/9 Obsolete Product(s) - Obsolete Product(s)