HD74AC670 Datasheet, PDF (2/10 Pages) Hitachi Semiconductor – 4 x 4 Register File with 3-State Output

HD74AC670
Logic Symbol
12 15 1 2 3
WE D1 D2 D3 D4
14
WA0
13
WA1
5
RA0
4
RA0
OE O1 O2 O3 O4
11 10 9 7 6
VCC=Pin 16
GND=Pin 8
Pin Names
D₁ to D₄
WA₀, WA₁
WE
RA₀, RA₁
OE
O₁ to O₄
Data Inputs
Write Address Inputs
Write Enable Input (Active Low)
Read Address Inputs
3-State Output Enable Input (Active Low)
Data Outputs
Write Function Table
Write Inputs
WE
WA₁
L
L
L
L
L
H
L
H
H
X
H : High Voltage Level
L : Low Voltage Level
X : Immaterial
WA₀
L
H
L
H
X
D Inputs to
Word 0
Word 1
Word 2
Word 3
None (hold)
2