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PDF 27C256 Data sheet ( 特性 )

部品番号 27C256
部品説明 262 /144-Bit (32K x 8) High Performance CMOS EPROM
メーカ National
ロゴ National ロゴ 

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27C256 Datasheet, 27C256 PDF,ピン配置, 機能
March 1989
27C256
262 144-Bit (32 768 x 8) UV Erasable CMOS PROM
Military Qualified
General Description
The 27C256 is a high-speed 256K UV erasable and electri-
cally reprogrammable CMOS EPROM ideally suited for ap-
plications where fast turnaround pattern experimentation
and low power consumption are important requirements
The 27C256 is designed to operate with a single a5V pow-
er supply with g10% tolerance The CMOS design allows
the part to operate over Military Temperature Range
The 27C256 is packaged in a 28-pin dual-in-line package
with transparent lid and a 32-pin windowed LCC The trans-
parent lid allows the user to expose the chip to ultraviolet
light to erase the bit pattern A new pattern can then be
written electrically into the device by following the program-
ming procedure
This EPROM is fabricated with National’s proprietary time
proven CMOS double-poly silicon gate technology which
combines high performance and high density with low pow-
er consumption and excellent reliability
The 27C256 specified on this data sheet is fully compliant
with MIL-STD-883 Revision C
Features
Y Clocked sense amps for fast access time down to
250 ns
Y Low CMOS power consumption
Active power 55 mW max
Standby power 0 55 mW max
Y Performance compatible to NSC800TM CMOS
microprocessor
Y Single 5V power supply
Y Pin compatible with NMOS 256K EPROMs
Y Fast and reliable programming (0 5 ms for most bytes)
Y Static operation no clocks required
Y TTL CMOS compatible inputs outputs
Y TRI-STATE output
Y Optimum EPROM for total CMOS systems
Y Windowed DIP and LCC package options
Y Specifications guaranteed over full military temperature
range (b55 C to a125 C)
Y This device is processed in compliance with SMD
86063 and the DIP version is dual marked
Block Diagram
TRI-STATE is a registered trademark of National Semiconductor Corporation
NSC800TM is a trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL D 10332
Pin Names
A0 – A14
CE
OE
O0 – O7
PGM
NC
Addresses
Chip Enable
Output Enable
Outputs
Program
No Connect
TL D 10332 – 1
RRD-B30M105 Printed in U S A

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