Overview
The M27C256B-12C6 is a 256 Kbit EPROM (Erasable Programmable Read-Only Memory) produced by STMicroelectronics. It is available in two main types: UV (ultra violet erase) and OTP (one time programmable). This device is ideally suited for microprocessor systems and is organized as 32,768 by 8 bits. The UV version, packaged in FDIP28W, features a transparent lid that allows the chip to be erased using ultraviolet light, while the OTP versions are offered in PDIP28, PLCC32, and TSOP28 packages for applications where erasure is not required.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Memory Size | 256 Kbit (32Kb x 8) | - |
| Supply Voltage (Read Operation) | 5V ± 10% | - |
| Access Time | 45ns | - |
| Active Current | 30mA at 5MHz | - |
| Standby Current | 100µA | - |
| Programming Voltage | 12.75V ± 0.25V | - |
| Programming Time | 100µs/word | - |
| Ambient Operating Temperature | –40 to 125°C | - |
| Electronic Signature | Manufacturer Code: 20h, Device Code: 8Dh | - |
Key Features
- Low Power Consumption: Active current of 30mA at 5MHz and standby current of 100µA.
- Two-Line Output Control: Features a two-line control function to accommodate multiple memory connections, ensuring low power dissipation and preventing output bus contention.
- ECOPACK® Packages: Available in lead-free ECOPACK® packages to meet environmental requirements.
- Electronic Signature: Allows the reading of a binary code to identify the manufacturer and device type.
- Programming and Erase Capabilities: UV version can be erased using ultraviolet light, while OTP versions are one-time programmable.
Applications
The M27C256B-12C6 is ideally suited for microprocessor systems. It can be used in various applications such as:
- Embedded systems requiring non-volatile memory.
- Industrial control systems.
- Automotive electronics.
- Consumer electronics where firmware storage is needed.
Q & A
- What is the memory size of the M27C256B-12C6?
The memory size is 256 Kbit, organized as 32,768 by 8 bits.
- What are the different package types available for the M27C256B-12C6?
The device is available in FDIP28W, PDIP28, PLCC32, and TSOP28 packages.
- What is the supply voltage for read operations?
The supply voltage for read operations is 5V ± 10%.
- What is the access time of the M27C256B-12C6?
The access time is 45ns.
- How does the two-line output control function work?
The two-line control function uses Chip Enable (E) and Output Enable (G) to manage memory selection and output, ensuring low power dissipation and preventing output bus contention.
- What is the purpose of the Electronic Signature mode?
The Electronic Signature mode allows the reading of a binary code to identify the manufacturer and device type, useful for programming equipment to match the device with its corresponding programming algorithm.
- How is the UV version of the M27C256B-12C6 erased?
The UV version can be erased using ultraviolet light through the transparent lid of the FDIP28W package.
- What are the programming voltage and time for the M27C256B-12C6?
The programming voltage is 12.75V ± 0.25V, and the programming time is 100µs per word.
- What is the standby current of the M27C256B-12C6?
The standby current is 100µA.
- Are the M27C256B-12C6 packages lead-free?
Yes, the M27C256B-12C6 is available in lead-free ECOPACK® packages.
