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CD54HC670 Datasheet(PDF) 2 Page - Texas Instruments

Part No. CD54HC670
Description  High-Speed CMOS Logic 4x4 Register File
Download  17 Pages
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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CD54HC670 Datasheet(HTML) 2 Page - Texas Instruments

 
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Functional Diagram
9
6
7
10
Q0
Q1
Q2
Q3
4
11
15
1
3
D0
D2
WE
RE
514
13
RA1
RA0
WA0
WA1
12
2
D1
D3
WRITE MODE SELECT TABLE
OPERATING
MODE
INPUTS
INTERNAL
LATCHES
(NOTE 1)
WE
DN
Write Data
L
L
L
LH
H
Data Latched
H
X
No Change
NOTE:
1. The Write Address (WA0 and WA1) to the “internal latches” must
be stable while WE is LOW for conventional operation.
READ MODE SELECT TABLE
OPERATING
MODE
INPUTS
OUTPUT
QN
RE
INTERNAL
LATCHES
(NOTE 2)
Read
L
L
L
LH
H
Disabled
H
X
(Z)
NOTE:
2. The selection of the “internal latches” by Read Address (RA0 and
RA1) are not constrained by WE or RE operation.
H = High Voltage Level
L = Low Voltage Level
X= Don’t Care
Z = High Impedance “Off” State
CD54HC670, CD74HC670, CD74HCT670
CD54HC670, CD74HC670, CD74HCT670


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