Overview
The M27C256B-45XF1 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 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. For environmentally friendly options, the device is also available in ECOPACK® packages, which are lead-free and compliant with JEDEC Standard JESD97.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (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 | 100µs/Word | µs/Word |
| Ambient Operating Temperature | –40 to 125°C | °C |
| Storage Temperature | –65 to 150°C | °C |
| Input or Output Voltage (except A9) | –2 to 7V | V |
| A9 Voltage | –2 to 13.5V | V |
Key Features
- Low Power Consumption: Active current of 30mA at 5MHz and standby current of 100µA.
- Fast Access Time: 45ns access time, ensuring quick data retrieval.
- Programming Efficiency: Programming voltage of 12.75V ± 0.25V and programming time of 100µs per word.
- Environmental Compliance: Available in ECOPACK® packages, which are lead-free and compliant with JEDEC Standard JESD97.
- Dual Control Functions: Chip Enable (E) and Output Enable (G) for efficient memory management and low power dissipation.
- Electronic Signature: Manufacturer code (20h) and device code (8Dh) for identification).
Applications
The M27C256B-45XF1 is widely used in various microprocessor systems due to its high storage capacity and efficient programming capabilities. It is suitable for applications requiring non-volatile memory, such as:
- Embedded systems
- Industrial control systems
- Automotive electronics
- Consumer electronics
- Telecommunication devices
Q & A
- What is the storage capacity of the M27C256B-45XF1?
The M27C256B-45XF1 has a storage capacity of 256 Kbit, organized as 32,768 by 8 bits).
- What are the different package types available for the M27C256B-45XF1?
The device is available in FDIP28W, PDIP28, and PLCC32 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-45XF1?
The access time is 45ns).
- How does the standby mode reduce power consumption?
In standby mode, the supply current reduces from 30mA to 100µA by applying a CMOS high signal to the E input).
- What is the programming voltage and time for the M27C256B-45XF1?
The programming voltage is 12.75V ± 0.25V, and the programming time is 100µs per word).
- What are the electronic signature codes for the M27C256B-45XF1?
The manufacturer code is 20h, and the device code is 8Dh).
- Is the M27C256B-45XF1 environmentally friendly?
Yes, it is available in ECOPACK® packages, which are lead-free and compliant with JEDEC Standard JESD97).
- What are the typical applications of the M27C256B-45XF1?
It is used in microprocessor systems, embedded systems, industrial control systems, automotive electronics, consumer electronics, and telecommunication devices).
- 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 power dissipation and prevent output bus contention).
