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M74HC138B1R Arkusz danych(PDF) 1 Page - STMicroelectronics

Numer części M74HC138B1R
Szczegółowy opis  3 TO 8 LINE DECODER INVERTING
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M54HC138
M74HC138
October 1992
3 TO 8 LINE DECODER (INVERTING)
B1R
(Plastic Package)
F1R
(Ceramic Package)
M1R
(Micro Package)
C1R
(Chip Carrier)
PIN CONNECTIONS (top view)
NC =
No Internal
Connection
INPUT AND OUTPUT EQUIVALENT CIRCUIT
ORDER CODES :
M54HC138F1R
M74HC138M1R
M74HC138B1R
M74HC138C1R
DESCRIPTION
.
HIGH SPEED
tPD = 16 ns (TYP.) AT VCC =5 V
.
LOW POWER DISSIPATION
ICC =4
µAAT TA =25 °C
.
OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
.
BALANCED PROPAGATION DELAYS
tPLH =tPHL
.
SYMMETRICAL OUTPUT IMPEDANCE
|IOH|= IOL
.
HIGH NOISE IMMUNITY
VNIH =VNIL =28 % VCC (MIN.)
.
WIDE OPERATING VOLTAGE RANGE
VCC (OPR) = 2 V TO 6 V
.
PIN AND FUNCTION COMPATIBLE
WITH 54/74LS138
The M54/74HC138 is a high speed CMOS 3 TO 8
LINE DECODER fabricated in silicon gate C
2MOS
technology.
It has the same high speed performance of LSTTL
combined with true CMOS low power consumption.
If the device is enabled, 3 binary select inputs (A, B
and C) determine which one of the outputs will go
low. If enable input G1 is held low or either G2A or
G2B is held high, the decoding function is inhibited
and all the 8 outputs go high.
Three enable inputs are provided to ease cascade
connection and application of address decoders for
memory systems. All inputs are equipped with pro-
tection circuits against static discharge and tran-
sient excess voltage.
1/10


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