M87C257

Features:

INTEGRATED ADDRESS LATCH
FAST ACCESS TIME: 45ns
LOW POWER "CMOS" CONSUMPTION:
  Active Current 30mA
  Standby Current 100A
PROGRAMMING VOLTAGE: 12.75V
ELECTRONIC SIGNATURE for AUTOMATED PROGRAMMING
PROGRAMMING TIMES of AROUND 3sec. (PRESTO II ALGORITHM)


Pinout




Specifications

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

Notes: 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 SGS-THOMSON 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 VCC +0.5V with possible overshoot to VCC +2V for a period less than 20ns.


Description

The M87C257 is a high speed 262,144 bit UV erasable and electrically programmable EPROM. The M87C257 incorporates latches for all address inputs to minimize chip count, reduce cost, and
The Window Ceramic Frit-Seal Dual-in-Line pack- age 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.
For applications where the content is programmed only one time and erasure is not required, the M87C257 is offered in Plastic Leaded Chip Carrier,
package.