DM74S473 Datasheet, PDF (1/6 Pages) National Semiconductor (TI) – (512 x 8) 4096-Bit TTL PROM

November 1990
DM74S473
(512 x 8) 4096-Bit TTL PROM
General Description
This Schottky memory is organized in the popular 512
words by 8 bits configuration A memory enable input is pro-
vided to control the output states When the device is en-
abled the outputs represent the contents of the selected
word When disabled the 8 outputs go to the ‘‘OFF’’ or high
impedance state
PROMs are shipped from the factory with lows in all loca-
tions A high may be programmed into any selected location
by following the programming instructions
Features
Y _{Advanced titanium-tungsten (Ti-W) fuses}
Y _{Schottky-clamped for high speed}
Address access 45 ns max
Enable access 30 ns max
Enable recovery 30 ns max
Y _{PNP inputs for reduced input loading}
Y _{All DC and AC parameters guaranteed over}
temperature
Y _{Low voltage TRI-SAFE}TM _programming
Y _{Open-collector outputs}
Block Diagram
Pin Names
A0 – A8
Addresses
G
Output Enable
GND
Ground
Q0 – Q7
Outputs
V_CC
Power Supply
TL D 9715 1
TRI SAFETM is a trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL D 9715
RRD B30M105 Printed in U S A