HD74AC670 Datasheet, PDF (1/10 Pages) Hitachi Semiconductor – 4 x 4 Register File with 3-State Output

HD74AC670
4 × 4 Register File with 3-State Output
Description
The HD74AC670 contains 16 high speed, low power, transparent D-type latches arranged as four words of
four bits each, to function as a 4 × 4 register file. Separate read and write inputs, both address and enable,
allow simultaneous read and write operation. The 3-state outputs make it possible to connect up to 128
outputs to increase the word capacity up to 512 words. Any number of these devices can be operated in
parallel to generate an n-bit length.
Features
• 3-State Outputs Drive Bus Lines or Buffer Memory Address Registers
• Outputs Source/Sink 24 mA
Pin Arrangement
D2 1
D3 2
D4 3
RA1 4
RA0 5
O4 6
O3 7
GND 8
(Top view)
16 VCC
15 D1
14 WA0
13 WA1
12 WE
11 OE
10 O1
9 O2