M74HC157B1R STMicroelectronics

M74HC157 QUAD 2 CHANNEL MULTIPLEXER HIGH SPEED: t = 10ns (TYP.) at V = 6V PD CC LOW POWER DISSIPATION: I = 4A(MAX.) at T =25C CC A HIGH NOISE IMMUNITY: V = V = 28 % V (MIN.) NIH NIL CC DIP SOP TSSOP SYMMETRICAL OUTPUT IMPEDANCE: I = I = 4mA (MIN) OH OL BALANCED PROPAGATION DELAYS: t t PLH PHL ORDER CODES WIDE OPERATING VOLTAGE RANGE: PACKAGE TUBE T & R V (OPR) = 2V to 6V CC DIP M74HC157B1R PIN AND FUNCTION COMPATIBLE WITH SOP M74HC157M1R M74HC157RM13TR 74 SERIES 157 TSSOP M74HC157TTR DESCRIPTION The M74HC157 is an high speed CMOS QUAD 2 The SELECT decoding determines whether the A CHANNEL MULTIPLEXER fabricated with silicon or B inputs get routed to their corresponding Y 2 gate C MOS technology. outputs. These device consist of four 2-input digital All inputs are equipped with protection circuits multiplexer with common select and strobe inputs. against static discharge and transient excess When the STROBE input is held high, selection of voltage. data is inhibited and all the outputs become low. PIN CONNECTION AND IEC LOGIC SYMBOLS July 2001 1/9M74HC157 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