Overview
The M27C256B-90C6 is a 256 Kbit EPROM (Erasable Programmable Read-Only Memory) produced by STMicroelectronics. This device is available in two main types: UV (ultra violet erase) and OTP (one time programmable). It is organized as 32,768 by 8 bits, making it suitable for microprocessor systems. The M27C256B is offered in various packages, including FDIP28W (window ceramic frit-seal package), PDIP28, and PLCC32, with the FDIP28W allowing for UV erasure through its transparent lid. The device is also available in ECOPACK® packages, which are lead-free and comply with environmental standards.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (Read Operation) | 5V ± 10% | V |
| Access Time | 90ns | ns |
| Active Current (at 5MHz) | 30mA | mA |
| Standby Current | 100µA | µA |
| Programming Voltage | 12.75V ± 0.25V | V |
| Programming Time | 100µs/Word | µs/Word |
| Manufacturer Code | 20h | - |
| Device Code | 8Dh | - |
| Ambient Operating Temperature | –40 to 125°C | °C |
Key Features
- Low Power Consumption: The device features low active and standby current levels, making it energy-efficient.
- Two-Line Output Control: This feature allows for efficient use in larger memory arrays, reducing power dissipation and preventing output bus contention.
- Electronic Signature: The device provides a unique electronic signature for identification, with manufacturer and device codes accessible through specific address lines.
- ECOPACK® Packages: The device is available in lead-free ECOPACK® packages, which meet environmental standards and are marked for compliance with JEDEC Standard JESD97.
- Programming and Erasure: The UV version allows for erasure using ultraviolet light, while the OTP version is programmed only once and does not require erasure.
Applications
The M27C256B is ideally suited for microprocessor systems and other applications requiring non-volatile memory. It is commonly used in:
- Embedded systems
- Industrial control systems
- Automotive electronics
- Consumer electronics
- Any application requiring programmable read-only memory
Q & A
- What is the storage capacity of the M27C256B?
The M27C256B has a storage capacity of 256 Kbits, organized as 32,768 by 8 bits.
- What are the different package types available for the M27C256B?
The device is available in FDIP28W, PDIP28, and PLCC32 packages.
- How is the M27C256B erased?
The UV version of the M27C256B can be erased using ultraviolet light, while the OTP version is programmed only once and does not require erasure.
- What is the typical access time for the M27C256B-90C6?
The typical access time for the M27C256B-90C6 is 90ns.
- What are the power consumption characteristics of the M27C256B?
The device has an active current of 30mA at 5MHz and a standby current of 100µA.
- How does the two-line output control function work?
The two-line output control function uses Chip Enable (E) and Output Enable (G) to manage data output and reduce power dissipation in larger memory arrays.
- What is the programming voltage and time for the M27C256B?
The programming voltage is 12.75V ± 0.25V, and the programming time is 100µs per word.
- What is the electronic signature of the M27C256B?
The electronic signature includes a manufacturer code (20h) and a device code (8Dh), accessible through specific address lines.
- Are the M27C256B packages lead-free?
- What are the ambient operating temperature ranges for the M27C256B?
The ambient operating temperature range is –40 to 125°C.
