HD74HCT237RPEL 데이터 시트보기 (PDF) - Renesas Electronics
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HD74HCT237RPEL Datasheet PDF : 8 Pages
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HD74HCT237
3-to-8-line Decoder/Demultiplexer with Address Latch
REJ03D0660–0200
(Previous ADE-205-548)
Rev.2.00
Mar 30, 2006
Description
The HD74HCT137 implements a three-to-eight line decoder with latches on the three address inputs. When GL goes
from low to high, the address present at the select inputs (A, B and C) is stored in the latches. As long as GL remains
high no address changes will be recognized. Output enable controls, G1 and G2, control the state of the outputs
independently of the select or latch-enable inputs.
All of the outputs are high unless G1 is high and G2 is low. The HD74HCT137 is ideally suited for the implementation
of glitch free decoders in stored-address applications in bus oriented systems.
Features
• High Speed Operation: tpd (A, B, C to Y) = 16.5 ns typ (CL = 50 pF)
• High Output Current: Fanout of 10 LSTTL Loads
• Wide Operating Voltage: VCC = 2 V to 6 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
• Ordering Information
Part Name
Package Type
Package Code
(Previous Code)
Package
Abbreviation
HD74HCT237RPEL
SOP-16 pin (JEDEC)
PRSP0016DG-A
(FP-16DNV)
RP
Taping Abbreviation
(Quantity)
EL (2,500 pcs/reel)
Function Table
Inputs
Enable
Select
GL
G1
G2
C
B
A
X
X
H
X
X
X
X
L
X
X
X
X
L
H
L
L
L
L
L
H
L
L
L
H
L
H
L
L
H
L
L
H
L
L
H
H
L
H
L
H
L
L
L
H
L
H
L
H
L
H
L
H
H
L
L
H
L
H
H
H
H
H
L
X
X
X
H : High level
L : Low level
X : Irrelevant
Outputs
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
H
Output Corresponding to stored address L; all others H
Rev.2.00 Mar 30, 2006 page 1 of 7
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