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PDF UM23256 Data sheet ( Hoja de datos )
| Número de pieza | UM23256 | |
| Descripción | 32K x 8 NMOS ROM | |
| Fabricantes | UMC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de UM23256 (archivo pdf) en la parte inferior de esta página. Total 3 Páginas | ||
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eUMC
UM23256/ UM23256A
Features
• EPROM pin compatible
• 32,768 x 8 bit organization
• Single +5 volt supply
• Access time-200/300/450ns (max)
• Totally static operation
• Completely TTL compatible
• 28 Pin JEDEC approved pinout
• UM23256A- automatic power down (CE)
output enable function (OE)
• UM23256 non power down version
two programmable chip
selects (CS)
• Three state outputs for wire-OR expansion
• EPROMs accepted as program data input
General Description
The UM23256 and UM23256A high performance Read
Only Memories are organized 32,768 words by 8 bits with
access times from 200 ns to 450 ns. The ROMs are
designed to be compatible with all microprocessor and
similar applications where high performance, large bit
storage and simple interfacing are important design con-
siderations. Both ROMs conform to the JEDEC approved
pinout for 28 pin 256K ROMs.
The UM23256 offers the simplest operation (no power
down.) Its two programmable chip selects allow up to four
256K ROMs to be OR-tied without external decoding.
The UM23256A offers an automatic power down feature.
Pin Configuration
Power down is controlled by the Chip Enable (CE) input.
When CE goes high, the device will automatically power
down and remain in a low power stand-by mode as long as
CE remains high. This unique feature provides system level
power savings as much as 90%. An additional feature of
the UM23256A is the Output Enable (OE) function. This
eliminates bus contention in multiple bus microprocessor
systems.
Both the UM23256 and UM23256A are pin compatible
with EPROMs thus eliminating the need to redesign printed
circuit boards for volume mask programmed ROMs after
prototyping with EPROMs.
Block Diagram
262. 144BIT
ROW'ARRAY
(512x512l
0,
t..;....I">--'--02
"---''-'---1>--;-03
o .L---'-I~---';-
L---'-:----I:>--;--O,
1-18
·CHIP SELECTS (CS) ARE PROGRAMMABLE LOW ACTIVE,
HIGH ACTIVE OR DON'T CARE
1 page | ||
| Páginas | Total 3 Páginas | |
| PDF Descargar | [ Datasheet UM23256.PDF ] | |
Hoja de datos destacado
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| UM23256A | 32K x 8 NMOS ROM | UMC |
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