M27V256

Features:

LOW VOLTAGE READ OPERATION:3V to 3.6V
FAST ACCESS TIME: 90ns
LOW POWER CONSUMPTION:
Active Current 10mA at 5MHz
Standby Current 10 A
PROGRAMMING VOLTAGE: 12.75V ± 0.25V
PROGRAMMING TIME: 100ms/byte (typical)
ELECTRONIC SIGNATURE
Manufacturer Code: 20h
Device Code: 8Dh


Pinout




Specifications

Symbol	Parameter	Value	Unit
TA	Ambient Operating Temperature (3)	40 to 125	°C
TBIAS	Temperature Under Bias	50 to 125	°C
TSTG	Storage Temperature	65 to 150	°C
VIO(2)	Input or Output Voltage (except A9)	2 to 7	V
VCC	Supply Voltage	2 to 7	V
VA9(2)	A9 Voltage	2 to 13.5	V
VPP	Program Supply Voltage	2 to 14	V

1. Except for the rating "Operating Temperature Range", stresses above those listed in the Table "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above those indicated in the Operating sections of this specification is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant quality documents.
2. Minimum DC voltage on Input or Output is 0.5V with possible undershoot to 2.0V for a period less than 20ns. Maximum DC voltage on Output is V_CC +0.5V with possible overshoot to V_CC +2V for a period less than 20ns.
3. Depends on range.


Description

The M27V256 is a low voltage 256 Kbit EPROM offered in the two ranges UV (ultra violet erase) and OTP (one time programmable). It is ideally suited for microprocessor systems and is organized as 32,768 by 8 bits.

The M27V256 operates in the read mode with a supply voltage as low as 3V. The decrease in operating power allows either a reduction of the size of the battery or an increase in the time between battery recharges.

The M27V256 (window ceramic frit-seal package) has a transparent lid which allows the user to expose the chip to ultraviolet light to erase the bit pattern.A new pattern can then be written to the device by following the programming procedure.