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M54HC298 Datasheet(PDF) 1 Page - STMicroelectronics

Part No. M54HC298
Description  QUAD 2 CHANNEL MULTIPLEXER/REGISTER
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M54HC298 Datasheet(HTML) 1 Page - STMicroelectronics

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M54HC298
M74HC298
October 1992
QUAD 2 CHANNEL MULTIPLEXER/REGISTER
B1R
(Plastic Package)
ORDER CODES :
M54HC298F1R
M74HC298M1R
M74HC298B1R
M74HC298C1R
F1R
(Ceramic Package)
M1R
(Micro Package)
C1R
(Chip Carrier)
PIN CONNECTIONS (top view)
NC =
No Internal
Connection
.
HIGH SPEED
fMAX = 73 MHz (typ.) AT VCC =5 V
.
LOW POWER DISSIPATION
ICC =4
µA (MAX.) AT TA =25 °C
.
HIGH NOISE IMMUNITY
VNIH =VNIL =28 % VCC (MIN.)
.
OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
.
SYMMETRICAL OUTPUT IMPEDANCE
I
OH =IOL = 4 mA (MIN.)
.
BALANCED PROPAGATION DELAYS
tPLH =tPHL
.
WIDE OPERATING VOLTAGE RANGE
VCC (OPR) = 2 V TO 6 V
.
PIN AND FUNCTION COMPATIBLE
WITH 54/74LS298
DESCRIPTION
The M54/74HC298 is a high speed CMOS QUAD 2-
CHANNEL MULTIPLEXER/REGISTER fabricated
in silicon gate C
2MOS technology.
It has the same high speed performance of LSTTL
combined with true CMOS low power consumption.
These circuits are controlled by the signals WORD
SELECT and CLOCK. When the WORD SELECT
input is taken low Word 1 (A1, B1, C1 and D1) is
presented to the input of the flip-flops, and when
WORD SELECT is high Word 2 (A2, B2, C2 and D2)
is presented to the inputs of the flip-flops. The select
word is clocked to the output terminals on the nega-
tive edge of the clock pulse. All inputs are equipped
with protection circuits against static discharge and
transient excess voltage.
INPUT AND OUTPUT EQUIVALENT CIRCUIT
1/11


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