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M74HC137B1R Arkusz danych(PDF) 1 Page - STMicroelectronics

Numer części M74HC137B1R
Szczegółowy opis  3 TO 8 LINE DECODER/LATCH INVERTING
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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M54HC137
M74HC137
February 1993
3 TO 8 LINE DECODER/LATCH (INVERTING)
B1R
(Plastic Package)
ORDER CODES :
M54HC137F1R
M74HC137M1R
M74HC137B1R
M74HC137C1R
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 = 11 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
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 54/74LS137
The M54/74HC137 is a high speed CMOS 3 TO 8LINE
DECODER/LATCH (INVERTING) 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 is a 3 to 8line decoder
withlatches on thethree address inputs. When GL goes
from low tohigh, theaddress present at theselect inputs
(A, B and C) is stored in the latches. AslongasGL re-
mains high no address changes will be recognized. Out-
put enable pins G1 and G2, control the state of the
outputs independently of the select or latch-enable in-
puts. All the outputs are high unless G1 is high and G2
is low. The HC137 is ideally suited for the implementa-
tion of glitch-free decoders in stored-address applica-
tions in bus oriented systems. All inputs are equipped
withprotection circuits against staticdischarge and tran-
sient excess voltage.
1/11


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