TL/F/10202
93L38
8-Bit
Multiple
Port
Register
July 1989
93L38
8-Bit Multiple Port Register
General Description
The 93L38 is an 8-bit multiple port register designed for high
speed random access memory applications where the abili-
ty to simultaneously read and write is desirable. A common
use would be as a register bank in a three address comput-
er. Data can be written into any one of the eight bits and
read from any two of the eight bits simultaneously. The cir-
cuit uses TTL technology and is compatible with all TTL
families.
Features
Y
Master/slave operation permitting simultaneous write/
read without race problems
Y
Simultaneously read two bits and write one bit in any
one of eight bit positions
Y
Readily expandable to allow for larger word sizes
Connection Diagram
Dual-In-Line Package
TL/F/10202–1
Order Number 93L38DMQB or 93L38FMQB
See NS Package Number J16A or W16A
Logic Symbol
TL/F/10202–2
V
CC
e Pin 16
GND e Pin 8
Pin Names Description
A0–A2 Write Address Inputs
DA Data Input
B0–B2 B Read Address Inputs
C0–C2 C Read Address Inputs
CP Clock Pulse Input (Active Rising Edge)
SLE Slave Enable Input (Active LOW)
ZB B Output
ZC C Output
C
1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.