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UM23128A PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 UM23128A
기능 16K x 8 NMOS ROM
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UM23128A 데이터시트, 핀배열, 회로
(l)UMO
UM23128/UM23128A
16K X 8 NMOS ROM
Features
• EPROM pin compatible
• 16,384 x 8 bit organization
• single +5 volt supply
• Access time - 200/300/450 ns (max)
• Totally static operation
• Completely TTL compatible
• 28 pin JEDEC approved pinout
• UM23128A- automatic power down (CE)
output enable function (OEl
one programmable chip select (CS)
• UM23128 non power down version
three programmable chip selects (CS)
• Three state outputs for wire-OR expansion
• EPROMS accepted as program data input
Description
The UM23128 and UM23128A high performance Read
Only Memories are organized 16,384 words by 8 bits with
access times from 200 ns to 450 ns. The ROMs are'design-
ed to be compatible with all microprocessor and similar
applications where high performance, large bit storage and
simple interfacing are important design considerations.
Both ROMs conform to the JEDEC approved pinout for
28 pin 128K ROMs.
The UM23128 offers the simplest operation (no power
down.) Its three programmable chip selects allow up to
eight 128K ROMs to be OR-tied without external decoding.
The UM23128A offers an automatic power down feature.
Pin Configuration
Ne vee Ne
AU eS1 * Al2
A7 Al3 A7
A6 As A6
As A9 As
A4 All A4
A3
eS2*
A3
A2 AlO A2
A1 eS3* A1
Ao
01
°2
03
GND
Os Ao
0 7 °1
06 02
°s 03
04 GND
Power dovyn is controlled by the Chip Enable (CE) input.
When CE goes high, the device will automatically power
down and remain in a low power standby mode as long as
CE remains high. This unique feature provides system level
power savings as much as 90%. An additional feature of
the UM23128A is the Output Enable (OE) function. This
eliminates bus contention in multiple bus microprocessor
systems. The programmable chip select allows two 128K
ROMs to be OR-tied without external decoding.
Both the UM23128 and UM23128A 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
Vee
eS1*
A13
As
A9
All
OE
A3
A.
As
A.
A7
AS
A9
All
AI3
Ao
AI
A,
AIO
All
131,072 BIT
ROM ARRAY
(512x256)
01
I..:....II"""'--_' 0,
-c-:---.~~-03
0.
'-----:-''--1>-:.-0,
~----.--I>--'--06
~---';-:--1:>--J--07
~-------'-.J>'--"!""-'Os
CS,
CS3
"CHIP SELECTS (CS) ARE PROGRAMMABLE LOW ACTIVE, HIGH ACTIVE, OR
DON'TeARE,
1-15






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링크공유

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관련 데이터시트

부품번호상세설명 및 기능제조사
UM23128

16K x 8 NMOS ROM

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