27C256_04 Datasheet, PDF (1/10 Pages) Microchip Technology – 256K (32K x 8) CMOS EPROM

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 µA 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
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 micro-
processors 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 appli-
cations, 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
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