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M87C257-15F1X Datasheet(PDF) 1 Page - STMicroelectronics

Part # M87C257-15F1X
Description  ADDRESS LATCHED 256K 32K x 8 UV EPROM and OTP EPROM
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M87C257-15F1X Datasheet(HTML) 1 Page - STMicroelectronics

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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
ASVPP
Address Strobe / Program Supply
VCC
Supply Voltage
VSS
Ground
Table 1. Signal Names
PLCC32 (C)
1
28
FDIP28W (F)


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