M54HC257 Datasheet, PDF (1/12 Pages) STMicroelectronics – HC258QUAD 2CHANNEL MULTIPLEXER 3-STATE, INVERTING HC257 QUAD 2 CHANNEL MULTIPLEXER 3-STATE

M54/M74HC257
M54/M74HC258
HC257 QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
HC258 QUAD 2 CHANNEL MULTIPLEXER (3-STATE, INVERTING)
. HIGH SPEED
tPD = 10 ns (TYP.) at VCC = 5 V
. LOW POWER DISSIPATION
I_CC = 4 µA (MAX.) at T_A = 25 °C
. HIGH NOISE IMMUNITY
VNIH = VNIL = 28 % VCC (MIN.)
. OUTPUT DRIVE CAPABILITY
15 LSTTL LOADS
. SYMMETRICAL OUTPUT IMPEDANCE
IOH = IOL = 6 mA (MIN.)
. BALANCED PROPAGATION DELAYS
t_PLH = t_PHL
. WIDE OPERATING VOLTAGE RANGE
VCC (OPR) = 2 V to 6 V
. PIN AND FUNCTION COMPATIBLE
WITH 54/74LS257/258
B1R
(Plastic Package)
F1R
(Ceramic Package)
M 1R
(Micro Package)
C1R
(Chip Carrier)
ORDER CODES :
M54HCXXXF1R M74HCXXXM1R
M74HCXXXB1R M74HCXXXC1R
PIN CONNECTIONS (top view)
HC257
DESCRIPTION
The M54/74HC257 and the M54/74HC258 are high
speed CMOS MULTIPLEXERs fabricated with sili-
con gate C²MOS technology.
They have the same high speed performance of
LSTTL combined with true CMOS low power con-
sumption.
These IC’s are composed of an independent 2-
channel multiplexer with common SELECT and EN-
ABLE INPUT.
The M54/74HC258 is an inverting multiplexer while
the M54/74HC257 is a non-inverting multiplexer.
When the ENABLE INPUT is held ”High”, outputs of
both IC’s become high-impedance state. If SELECT
INPUT is held ”Low”, ”A” data is selected, when SE-
LECT INPUT is high ”H”, ”B” data is chosen.
All inputs are equipped with protection circuits
against static discharge and transient excess volt-
age.
HC258
October 1992
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