M27C400

Features:

5V ± 10% SUPPLY VOLTAGE in READ OPERATION
ACCESS TIME: 55ns
BYTE-WIDE or WORD-WIDE CONFIGURABLE
4 Mbit MASK ROM REPLACEMENT
LOW POWER CONSUMPTION
Active Current 70mA at 8MHz
Stand-by Current 100A
PROGRAMMING VOLTAGE: 12.5V ± 0.25V
PROGRAMMING TIME: 100s/word
ELECTRONIC SIGNATURE
Manufacturer Code: 20h
Device Code: B8h


Pinout




Specifications

Symbol	Parameter	Value	Unit
TA	Ambient Operating Temperature (2)	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 M27C400 is an 4 Mbit EPROM offered in the two ranges UV (ultra violet erase) and OTP (one time programmable). It is ideally suited for microprocessor systems requiring large data or program storage. It is organised as either 512 Kwords of 8 bit or 256 Kwords of 16 bit. The pin-out is compatible with the most common 8 Mbit Mask ROM.

The FDIP40W (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 M27C400 can then be written rapidly to the device by following the programming procedure.

For applications where the content is programmed only one time and erasure is not required, the M27C400 is offered in PDIP40 package.