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STMicroelectronics Electronic Components Datasheet

M74HC298 Datasheet

QUAD 2 CHANNEL MULTIPLEXER/REGISTER

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M74HC298 pdf
M54HC298
M74HC298
QUAD 2 CHANNEL MULTIPLEXER/REGISTER
. 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
IOH= 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
B1R
(Plastic Package)
F1R
(Ceramic Package)
M 1R
(Micro Package)
C1R
(Chip Carrier)
ORDER CODES :
M 54HC 29 8F 1R
M 74H C2 98 M1 R
M 74HC 29 8B 1R
M 74H C2 98 C1 R
The M54/74HC298 is a high speed CMOS QUAD 2-
CHANNEL MULTIPLEXER/REGISTER fabricated
in silicon gate C2MOS technology.
PIN CONNECTIONS (top view)
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
October 1992
NC =
No Internal
Connection
1/11


STMicroelectronics Electronic Components Datasheet

M74HC298 Datasheet

QUAD 2 CHANNEL MULTIPLEXER/REGISTER

No Preview Available !

M74HC298 pdf
M54/M74HC298
TRUTH TABLE
INPUTS
OUTPUTS
WORD SELECT
CLOCK
QA
QB
QC
QD
L a1 b1 c1 d1
H a2 b2 c2 d2
X
QA0
QB0
QC0
QD0
X : DON’T CARE (INCLUDING TRANSITION)
a1, a2, ETC : THE LEVEL OF STEAY STATE INPUT AT a1, a2, etc.
QA0, QB0, ETC : THE LEVEL OF QA, QB, ETC ENTERED ON THE MOST RECENT NEGATIVE TRANSITION OF THE CLOCK INPUT.
LOGIC DIAGRAM
2/11


Part Number M74HC298
Description QUAD 2 CHANNEL MULTIPLEXER/REGISTER
Maker ST Microelectronics
Total Page 11 Pages
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