AT27C256R-70PU: High-Speed 256Kb EPROM Memory IC by Microchip Technology
AT27C256R-70PU: Ultimate Guide to Microchip's High-Speed 256Kb EPROM Memory
Introduction to AT27C256R-70PU
The AT27C256R-70PU represents the pinnacle of EPROM (Erasable Programmable Read-Only Memory) technology from Microchip Technology, a global semiconductor leader. This comprehensive guide explores why engineers worldwide trust this memory IC for critical applications requiring non-volatile data storage with blazing-fast 70ns access times.
Technical Deep Dive
Memory Architecture
Organized as 32K x 8-bit memory, the AT27C256R-70PU delivers:
- 256Kbit total storage capacity
- Parallel interface for maximum bandwidth
- One-Time Programmable (OTP) security
Performance Specifications
| Parameter | Specification |
|---|---|
| Access Time | 70ns (max) |
| Operating Voltage | 4.5V - 5.5V |
| Power Consumption | 30mA active (typical) |
| Data Retention | 10+ years |
| Package | 28-pin PDIP (600mil) |
Key Advantages
- Industrial Reliability: Operates across -40 C to +85 C with 10kV ESD protection
- Design Flexibility: Compatible with industry-standard 27C256 pinouts
- Cost Efficiency: OTP technology eliminates need for expensive UV erasure
- High-Speed Operation: 70ns access enables real-time system performance
Application Scenarios
1. Industrial Control Systems
Used in PLCs for storing:
- Machine calibration data
- Safety-critical firmware
- Equipment configuration parameters
2. Automotive Electronics
Implements:
- ECU bootloaders
- Immobilizer security codes
- Dashboard firmware
3. Medical Devices
Ensures reliable storage of:
- Device operating algorithms
- Patient safety limits
- FDA-approved firmware versions
Design Considerations
When implementing the AT27C256R-70PU:
- Ensure proper decoupling capacitors (0.1 F ceramic near VCC)
- Maintain signal integrity on address/data lines
- Implement programming voltage (12.5V) only during write cycles
- Consider socket options for field replacement
Competitive Comparison
Compared to alternative solutions:
| Feature | AT27C256R-70PU | Competitor A |
|---|---|---|
| Access Time | 70ns | 90ns |
| Temp Range | -40 C to +85 C | 0 C to 70 C |
| Package Options | PDIP, PLCC | PDIP only |
Purchasing Information
The AT27C256R-70PU is available:
- Direct from Microchip Technology
- Through authorized distributors (Digi-Key, Mouser)
- In bulk quantities (tray packaging)
Conclusion
For engineers requiring high-speed, reliable non-volatile memory, the AT27C256R-70PU delivers exceptional performance in demanding environments. Its combination of 70ns access time, industrial temperature operation, and OTP security makes it the ideal choice for mission-critical applications across multiple industries.
Ready to integrate this memory solution? Contact our technical team for design support or request samples today.