Product Overview
The IS61C256AL-12JLI is a 256Kbit asynchronous SRAM (Static Random Access Memory) manufactured by ISSI (Integrated Silicon Solution, Inc.). Organized as 32K x 8 bits, it features a 28-SOJ package and operates with 12ns access time. The device runs on a 4.5V to 5.5V supply voltage and is designed for high-speed applications requiring fast random access memory. This is an obsolete/end-of-life part that was widely used in legacy systems and industrial equipment.
Key Specifications
| Memory Type | SRAM – Asynchronous (Volatile) |
| Memory Size | 256Kbit (32K x 8) |
| Interface | Parallel |
| Access Time | 12 ns |
| Voltage Supply | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C |
| Package | 28-SOJ (BSOJ) |
| Organization | 32,768 words x 8 bits |
| Supply Current (Operating) | Low power CMOS design |
| Chip Enable | Active low CE# |
Features
- High-speed access time: 12ns
- 32K x 8 bit organization
- Single 5V power supply (4.5V-5.5V)
- Low power CMOS technology
- All inputs and outputs are TTL compatible
- Three state outputs
- Separate byte enable for upper/lower bytes on wider versions
- Industrial temperature range: -40°C to +85°C
- Surface mount SOJ package
- RoHS compliant
Applications
- High-speed cache memory systems
- Industrial control and automation
- Telecommunications equipment
- Embedded systems data buffering
- Networking and data communication
- Legacy system maintenance and replacement
- Medical equipment
- Aerospace and defense electronics