M87C257

ADDRESS LATCHED

256K (32K x 8) UV EPROM and OTP EPROM

June 1996

1/13

AI00928B

15

A0-A14

ASVPP

Q0-Q7

VCC

M87C257

G

E

VSS

8

Figure 1. Logic Diagram

INTEGRATED ADDRESS LATCH

FAST ACCESS TIME: 45ns

LOW POWER “CMOS” CONSUMPTION:

– Active Current 30mA

– Standby Current 100

µA

PROGRAMMING VOLTAGE: 12.75V

ELECTRONIC SIGNATURE for AUTOMATED

PROGRAMMING

PROGRAMMING TIMES of AROUND 3sec.

(PRESTO II ALGORITHM)

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

simplify the design of multiplexed bus systems.

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.

A0 - A14

Address Inputs

Q0 - Q7

Data Outputs

E

Chip Enable

G

Output Enable

Address Strobe / Program Supply

Supply Voltage

Ground

Table 1. Signal Names

PLCC32 (C)

1

28

FDIP28W (F)