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M54HC147 Datasheet(PDF) 1 Page - STMicroelectronics

Part No. M54HC147
Description  10 TO 4 LINE PRIORITY ENCODER
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
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M54HC147 Datasheet(HTML) 1 Page - STMicroelectronics

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M54HC147
M74HC147
October 1992
10 TO 4 LINE PRIORITY ENCODER
B1R
(Plastic Package)
ORDER CODES :
M54HC147F1R
M74HC147M1R
M74HC147B1R
M74HC147C1R
F1R
(Ceramic Package)
M1R
(Micro Package)
C1R
(Chip Carrier)
PIN CONNECTIONS (top view)
NC =
No Internal
Connection
INPUT AND OUTPUT EQUIVALENT CIRCUIT
DESCRIPTION
.
HIGH SPEED
tPD = 15 ns (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 54/74LS147
The M54/74HC147 is a high speed CMOS 10 TO 4
LINE PRIORITY ENCODER fabricated in silicon
gate C
2MOS technology. It has the same high
speed performance of LSTTL combined with true
CMOS low power consumption.
This device features priority encoding of the inputs
to ensure that only the highest order data line is en-
coded. Nine input lines are encoded to a four line
BCD output. The implied decimal zero condition re-
quires no input condition as zero is encoded when
all nine data lines are at high logic level. All data input
and outputs are active at the low logic level. All in-
puts are equipped with protection circuits against
static discharge and transient excess voltage.
1/10


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