The AT27C256R-45PU EPROM by Microchip is a high-performance one-time programmable (OTP) memory with a 32Kx8-bit organization, 45ns access time, and 5V operating voltage. Designed for high-speed and reliable data storage, this EPROM is ideal for applications in embedded systems, industrial automation, telecommunications, and consumer electronics.
We provides an in-depth look at the AT27C256R-45PU, covering its specifications, key features, applications, circuit diagram, and use case scenarios. It also highlights why Xon Electronics is the best retailer for this component worldwide, serving customers in the USA, India, Australia, Europe, and other regions.
Technical Specifications
The AT27C256R-45PU is designed for high-speed operations and permanent data storage. Below are its key technical specifications:
| Feature | Specification |
|---|
| Memory Type | OTP EPROM |
| Memory Size | 256Kb (32K x 8-bit) |
| Access Time | 45ns |
| Operating Voltage | 5V |
| Standby Current | 100 µA |
| Programming Voltage | 12.75V |
| Package Type | DIP-28 |
| Technology | CMOS |
| Data Retention | Over 100 years |
| Operating Temperature | -40°C to +85°C |
| Programming Cycles | Single write |
Key Features of AT27C256R-45PU EPROM
Fast Read Access Time – With 45ns access time, it is ideal for high-speed operations in microcontroller-based applications.
High-Reliability CMOS Technology – Ensures lower power consumption and high data retention.
Low Power Standby Mode – Consumes only 100 µA in standby mode.
One-Time Programmable (OTP) – Ensures secure, permanent data storage.
5V Single Supply Operation – No additional power sources required for standard operation.
DIP-28 Package – Supports easy through-hole mounting for PCB integration.
Industrial Temperature Range – Works in -40°C to +85°C environments, making it suitable for rugged applications.
Applications of AT27C256R-45PU EPROM
The AT27C256R-45PU EPROM is widely used across multiple industries for permanent and secure data storage. Some key applications include:
Embedded Systems – Used for storing firmware and bootloaders.
Industrial Automation – Ideal for programmable logic controllers (PLCs) and motor control systems.
Consumer Electronics – Found in set-top boxes, gaming consoles, and legacy computing devices.
Telecommunications – Used in modems, routers, and network interface cards.
Aerospace and Defense – Ensures stable and secure memory for mission-critical systems.
Medical Equipment – Utilized in diagnostic devices and patient monitoring systems.
Circuit Diagram for AT27C256R-45PU EPROM
Below is a simple circuit diagram demonstrating how the AT27C256R-45PU can be interfaced with a microcontroller:
+5V
|
| +---/---+
| A0 ---|1 28|--- VCC
| A1 ---|2 27|--- A14
| A2 ---|3 26|--- A13
| A3 ---|4 25|--- A12
| A4 ---|5 24|--- A11
| A5 ---|6 23|--- A10
| A6 ---|7 22|--- A9
| A7 ---|8 21|--- A8
| OE ---|9 20|--- CE
| GND ---|10 19|--- D7
| D0 ---|11 18|--- D6
| D1 ---|12 17|--- D5
| D2 ---|13 16|--- D4
| D3 ---|14 15|--- VPP
| +--------+
VCC (Pin 28): Connects to +5V power supply.
GND (Pin 14): Ground connection.
A0–A14 (Pins 1-13, 23-27): Address bus.
D0–D7 (Pins 11-13, 15-19): Data bus.
OE (Pin 9): Output Enable (Active Low).
CE (Pin 20): Chip Enable (Active Low).
VPP (Pin 15): Programming voltage (Connect to VCC in normal operation).
This configuration allows the EPROM to be read by the microcontroller when the CE and OE signals are activated.
Use Case Scenario
Scenario: Storing Firmware for an Industrial Controller
Problem:
A manufacturing plant needs a reliable memory solution to store firmware for its motor control systems. The memory must be non-volatile and capable of operating in an industrial environment.
Solution:
The AT27C256R-45PU EPROM is used to store the control firmware that governs motor operations. Since the firmware does not change frequently, an OTP EPROM ensures secure and stable storage without the risk of data loss.
Implementation:
The firmware is programmed into the AT27C256R-45PU using an EPROM programmer.
The EPROM is mounted onto the motor control circuit.
The microcontroller reads the firmware from the EPROM whenever the system powers up.
The firmware executes control commands, ensuring smooth motor operations.
Results:
Stable and Reliable Memory Solution ?
Fast Read Access for Quick System Boot-Up ?
Long-Term Data Retention for Secure Storage ?
Industrial-Grade Durability ?
Why Buy from Xon Electronics?
Xon Electronics is a leading global retailer of electronic components, providing high-quality products with competitive pricing, fast shipping, and exceptional customer support. Here’s why you should purchase the AT27C256R-45PU EPROM from Xon Electronics:
?? Worldwide Availability – Ships to USA, India, Australia, Europe, and beyond.
?? Authentic Microchip Products – 100% genuine and tested components.
?? Competitive Pricing – Best deals on bulk orders.
?? Fast Shipping – Reliable delivery options.
?? Expert Technical Support – Assistance for circuit design and implementation.
Conclusion
The AT27C256R-45PU EPROM by Microchip is a high-speed, reliable, and secure memory solution for a wide range of applications. Its fast access time, low power consumption, and high durability make it a preferred choice for embedded systems, industrial automation, telecommunications, and consumer electronics.
With its one-time programmable (OTP) design, it is an ideal memory solution for firmware storage. If you are looking for a trusted supplier, Xon Electronics is your go-to retailer for high-quality electronic components worldwide.
Frequently Asked Questions (FAQs) about AT27C256R-45PU EPROM
1. What is the AT27C256R-45PU EPROM?
The AT27C256R-45PU is a one-time programmable (OTP) EPROM with a 32Kx8-bit memory organization, 45ns access time, and a 5V operating voltage. It is manufactured by Microchip and comes in a 28-pin DIP package.
2. What are the key features of the AT27C256R-45PU?
- 256Kb (32K x 8) memory organization
- Fast 45ns read access time
- Low power consumption (standby current of 100 µA)
- Single 5V power supply
- CMOS and TTL-compatible inputs and outputs
- High-reliability CMOS technology
3. What are the common applications of this EPROM?
The AT27C256R-45PU is commonly used in firmware storage, embedded systems, industrial automation, telecommunications, and consumer electronics.
4. Can the AT27C256R-45PU be reprogrammed?
No, this is a one-time programmable (OTP) EPROM, meaning it can only be programmed once and cannot be erased or reprogrammed.
5. How is the AT27C256R-45PU programmed?
It requires an EPROM programmer that supports 27C256 series devices. Once programmed, the data remains permanently stored.
6. What is the advantage of using an OTP EPROM?
It provides permanent data storage with high reliability, making it ideal for applications where data security and stability are critical.
7. Where can I buy the AT27C256R-45PU EPROM?
You can purchase it from Xon Electronics, a leading global retailer, with availability in the USA, India, Australia, Europe, and other countries.
8. What is the package type of this EPROM?
It is available in a 28-pin Dual In-line Package (DIP), which is ideal for through-hole mounting and prototyping.
9. Does the AT27C256R-45PU require an external power source?
Yes, it operates with a single 5V power supply.
10. How does the AT27C256R-45PU compare to modern memory solutions?
While newer memory technologies offer reprogrammability, OTP EPROMs like the AT27C256R-45PU are still preferred in applications requiring secure, permanent storage without the risk of accidental data loss.