27C256 Datasheet | Microchip Technology

FEATURES - High speed performance - 90 ns access time available - CMOS Technology for low power consumption - 20 m A Active current - 100 µA Standby current - Factory programming available - Auto-insertion-patible 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: - mercial: 0°C to +70°C - Industrial: -40°C to +85°C - Automotive: -40°C to +125°C 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 acplished 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 plete 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. PACKAGE TYPES PLCC A6 5 A5 6 A4 7 A3 8 A2 9 A1 10 A0 11 NC 12 O0 13 DIP/SOIC VPP 1 A12 2 A7 3 A6 4 A5 5 A4 6 A3 7 A2 8 A1 9 A0 10 O0 11 O1 12 O2 13 VSS 14 O1 14 O2 15 VSS 16 NU 17 O3 18 O4 19 O5 20 4 A7 3 A12 2 VPP 1 NU 32 Vcc 31 A14 30 A13 29 A8 28 A9 27 A11 26 NC 25 OE 24 A10 23 CE 22 O7 21 O6 28 VCC 27 A14 26 A13 25 A8 24 A9 23 A11 22 OE 21 A10 20 CE 19 O7 18 O6 17 O5 16 O4 15 O3  2004 Microchip Technology Inc. DS11001N-page 1 1.0 ELECTRICAL CHARACTERISTICS 1.1 Maximum Ratings-...