27C25610_12_15_20_90| Datasheet

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Obsolete Device

27C256
256K (32K x 8) CMOS EPROM
FEATURES
High speed performance - 90 ns access time available CMOS Technology for low power consumption - 20 mA Active current - 100 uA Standby current Factory programming available Auto-insertion-compatible plastic packages Auto ID aids automated programming Separate chip enable and output enable controls High speed "express" programming algorithm Organized 32K x 8: JEDEC standard pinouts - 28-pin Dual-in-line package - 32-pin PLCC Package - 28-pin SOIC package - Tape and reel Data Retention > 200 years Available for the following temperature ranges: - Commercial: 0 C to +70 C - Industrial: -40 C to +85 C - Automotive: -40 C to +125 C

PACKAGE TYPES
PLCC
32 31 30 4 3 2 1

A6 A5 A4 A3 A2 A1 A0 NC O0

A7 A12 VPP NU Vcc A14 A13
5 6 7 29 28 27 8 9 10 11 12 13 14 15 16 17 18 19 20 26 25 24 23 22 21

A8 A9 A11 NC OE A10 CE O7 O6

DIP/SOIC
VPP A12 A7 A6 A5 A4 A3 A2 A1 A0 O0 O1 O2 VSS

O1 O2 VSS NU O3 O4 O5
1 2 3 4 5 6 7 8 9 10 11 12 13 14

27C256
28 27 26 25 24 23 22 21 20 19 18 17 16 15

DESCRIPTION
The Microchip Technology Inc. 27C256 is a CMOS 256K bit electrically Programmable Read Only Memory (EPROM). The device is organized as 32K words by 8 bits (32K bytes). Accessing individual bytes from an address transition or from power-up (chip enable pin going low) is accomplished in less than 90 ns. This very high speed device allows the most sophisticated microprocessors to run at full speed without the need for WAIT states. CMOS design and processing enables this part to be used in systems where reduced power consumption and reliability are requirements. A complete family of packages is offered to provide the most flexibility in applications. For surface mount applications, PLCC, or SOIC packaging is available. Tape and reel packaging is also available for PLCC or SOIC packages.

VCC A14 A13 A8 A9 A11 OE A10 CE O7 O6 O5 O4 O3

27C256

2004 Microchip Technology Inc.

DS11001N-page 1