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DM74S473AJ View Datasheet(PDF) - National ->Texas Instruments

Part NameDM74S473AJ National-Semiconductor
National ->Texas Instruments National-Semiconductor
Description(512 x 8) 4096-Bit TTL PROM
DM74S473AJ Datasheet PDF : 6 Pages
1 2 3 4 5 6
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-SAFETM programming
Y Open-collector outputs
Block Diagram
Pin Names
A0 – A8
Addresses
G
Output Enable
GND
Ground
Q0 – Q7
Outputs
VCC
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
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General Description
This Schottky memory is organized in the popular 512 words by 8 bits configuration. A memory enable input is provided to control the output states. When the device is enabled, 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 locations. A high may be programmed into any selected location by following the programming instructions.

Features
Advanced titanium-tungsten (Ti-W) fuses
Schottky-clamped for high speed
   Address accessÐ45 ns max
   Enable accessÐ30 ns max
   Enable recoveryÐ30 ns max
PNP inputs for reduced input loading
All DC and AC parameters guaranteed over temperature
Low voltage TRI-SAFE™ programming
Open-collector outputs

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