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M74HC157
QUAD 2 CHANNEL MULTIPLEXER
1/9July 2001 HIGH SPEED:
tPD = 10ns (TYP.) at VCC = 6V LOW POWER DISSIPATION:CC = 4μA(MAX.) at TA =25°C HIGH NOISE IMMUNITY:NIH = VNIL = 28 % VCC (MIN.) SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 4mA (MIN) BALANCED PROPAGATION DELAYS:
tPLH ≅ tPHL WIDE OPERATING VOLTAGE RANGE:CC (OPR) = 2V to 6V PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 157
DESCRIPTIONThe M74HC157 is an high speed CMOS QUAD 2
CHANNEL MULTIPLEXER fabricated with silicon
gate C2 MOS technology.
These device consist of four 2-input digital
multiplexer with common select and strobe inputs.
When the STROBE 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.
M74HC157QUAD 2 CHANNEL MULTIPLEXER
PIN CONNECTION AND IEC LOGIC SYMBOLS
ORDER CODES
M74HC1572/9
INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
TRUTH TABLE X : Don’t Care
LOGIC DIAGRAM
M74HC1573/9
ABSOLUTE MAXIMUM RATINGS Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
(*) 500mW at 65 °C; derate to 300mW by 10mW/°C from 65°C to 85°C
RECOMMENDED OPERATING CONDITIONS
M74HC1574/9
DC SPECIFICATIONS * : Applicable only to DIR, G, G input
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6ns)
M74HC1575/9
CAPACITIVE CHARACTERISTICS 1) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. ICC(opr) = CPD x VCC x fIN + ICC/4(per chan-
nel)
TEST CIRCUIT CL = 50pF or equivalent (includes jig and probe capacitance)
RT = ZOUT of pulse generator (typically 50Ω)
WAVEFORM : PROPAGATION DELAY TIMES (f=1MHz; 50% duty cycle)
