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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.
M87C257 Maximum Ratings
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.
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)