27C256 EPROM – OTP Memory IC 256Kbit Parallel (USED)
The 27C256 is a 256-Kbit (32K × 8) CMOS EPROM (one-time programmable) designed for high-speed, low-power read operations. It provides fast, byte-wide access (access times down to 90 ns) so microprocessors can fetch code or data without added wait states. The device is offered in multiple package styles (DIP, PLCC, SOIC) and supports standard JEDEC pinouts for easy board integration.
Built using CMOS technology, the 27C256 minimizes active and standby current draw (typical active ≈20 mA; standby ≈100 µA) while maintaining stable output drive and low leakage. Programming is performed using a VPP programming voltage and an express programming algorithm that applies short program pulses and verifies bytes automatically, improving production throughput. The device also includes separate CE and OE controls to simplify bus sharing and system designs.
The part is robust for long-term storage (data retention >200 years specified) and is available across commercial, industrial and automotive temperature ranges, making it suitable for legacy systems, firmware storage, and environments that require extended temperature operation. Identity mode and programming inhibit features ease manufacturing and parallel programming setups.
Features:
- High-speed performance 90 ns access time available.
- CMOS technology for low power consumption.
- Active current typically 20 mA; standby current typically 100 µA.
- Factory programming available.
- Auto-insertion-compatible plastic packages (DIP, PLCC, SOIC).
- Auto ID to aid automated programming.
- Separate Chip Enable (CE) and Output Enable (OE) controls.
- High-speed “express” programming algorithm.
- Organized as 32K × 8 (256K bit) with JEDEC standard pinouts.
- Data retention greater than 200 years.
- Available temperature ranges: Commercial (0°C to +70°C), Industrial (-40°C to +85°C), Automotive (-40°C to +125°C).
Specifications:
| Parameter | Value |
|---|---|
| Memory Organization: | 32K × 8 (256 Kbit) |
| Access Time (tACC): | 90 ns (fastest), also 100/120/150/200 ns options |
| Supply Voltage (VCC): | +5 V (±10%) |
| Programming Voltage (VPP/VH): | ≈ 13.0 V |
| Active Supply Current (ICC): | ≈ 20 mA (typical, read mode) |
| Standby Current (ICC(S)): | ≈ 100 µA (CMOS input standby) |
| Output Drive: | VOH ≥ 2.4 V (IOH = -400 µA), VOL ≤ 0.45 V (IOL = 2.1 mA) |
| Data Retention: | > 200 years |
| Operating Temperature: | Commercial: 0°C to +70°C; Industrial: -40°C to +85°C; Automotive: -40°C to +125°C |
| Packages Available: | 28-pin DIP, 32-pin PLCC, 28-pin SOIC; tape & reel options |
| Programming Algorithm: | Express algorithm up to ten 100 µs program pulses with verify |
| Pin Count / Interfaces: | A0–A14 address inputs; O0–O7 data outputs; CE, OE, VPP, VCC, VSS |
| Typical Programming Pulse Width (tPW): | ~100 µs (express) |
Pinout Diagram:
Footprint Diagram:
Applications:
- Embedded firmware storage.
- Microprocessor / microcontroller code memory.
- Legacy system ROM replacement.
- Industrial control systems.
- Automotive electronic modules (extended temp).
Package Contents:
- 1x 27C256 EPROM – OTP Memory IC 256Kbit Parallel (USED)
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