Overview
The M27C256B-90C1 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 ideally suited for microprocessor systems.
The M27C256B-90C1 is offered in various packages, including FDIP28W (window ceramic frit-seal package), PDIP28, PLCC32, and TSOP28. The FDIP28W package features a transparent lid that allows the user to expose the chip to ultraviolet light for erasure, while the other packages are suitable for applications where the content is programmed only once and erasure is not required.
The device is designed to meet environmental requirements and is available in ECOPACK® packages, which are lead-free and comply with JEDEC Standard JESD97.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage in Read Operation | 5V ± 10% | V |
| Access Time | 45ns | ns |
| Active Current at 5MHz | 30mA | mA |
| Standby Current | 100µA | µA |
| Programming Voltage | 12.75V ± 0.25V | V |
| Programming Time per Word | 100µs | µs |
| 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, making it energy-efficient.
- Two-Line Output Control: This feature allows for efficient use in larger memory arrays, minimizing power dissipation and preventing output bus contention.
- Electronic Signature: The device can be identified through its electronic signature, which includes the manufacturer code (20h) and device code (8Dh).
- ECOPACK® Packages: The device is available in lead-free ECOPACK® packages, complying with environmental standards.
- Multiple Package Options: Available in FDIP28W, PDIP28, PLCC32, and TSOP28 packages to suit various application needs.
Applications
The M27C256B-90C1 is ideally suited for microprocessor systems and can be used in a variety of applications, including:
- Embedded systems requiring non-volatile memory.
- Industrial control systems where program storage is necessary.
- Automotive and aerospace applications due to its robust environmental specifications.
- Consumer electronics that require programmable memory.
Q & A
- What is the memory organization of the M27C256B-90C1?
The M27C256B-90C1 is organized as 32,768 by 8 bits.
- What are the different package options available for the M27C256B-90C1?
The device is available in FDIP28W, PDIP28, PLCC32, and TSOP28 packages.
- What is the supply voltage required for read operation?
The supply voltage required for read operation is 5V ± 10%.
- What is the access time of the M27C256B-90C1?
The access time is 45ns.
- How does the standby mode affect the supply current?
The standby mode reduces the supply current from 30mA to 100µA.
- What is the programming voltage and time for the M27C256B-90C1?
The programming voltage is 12.75V ± 0.25V, and the programming time per word is 100µs.
- How can the device be identified electronically?
The device can be identified through its electronic signature, which includes the manufacturer code (20h) and device code (8Dh).
- What are the environmental specifications for the M27C256B-90C1?
The device operates within an ambient temperature range of –40 to 125°C.
- Are the packages of the M27C256B-90C1 lead-free?
- What is the purpose of the two-line output control feature?
The two-line output control feature minimizes power dissipation and prevents output bus contention in larger memory arrays.
