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M87C257-45C1X

Description
32K X 8 UVPROM, 90 ns, CDIP28
Categorystorage    storage   
File Size96KB,13 Pages
ManufacturerSTMicroelectronics
Websitehttp://www.st.com/
Environmental Compliance
Download Datasheet Parametric View All

M87C257-45C1X Overview

32K X 8 UVPROM, 90 ns, CDIP28

M87C257-45C1X Parametric

Parameter NameAttribute value
Is it lead-free?Lead free
Is it Rohs certified?conform to
MakerSTMicroelectronics
package instructionQCCJ, LDCC32,.5X.6
Reach Compliance Codecompli
Maximum access time45 ns
I/O typeCOMMON
JESD-30 codeR-PQCC-J32
JESD-609 codee3
memory density262144 bi
Memory IC TypeOTP ROM
memory width8
Number of terminals32
word count32768 words
character code32000
Maximum operating temperature70 °C
Minimum operating temperature
organize32KX8
Output characteristics3-STATE
Package body materialPLASTIC/EPOXY
encapsulated codeQCCJ
Encapsulate equivalent codeLDCC32,.5X.6
Package shapeRECTANGULAR
Package formCHIP CARRIER
Peak Reflow Temperature (Celsius)NOT SPECIFIED
power supply5 V
Maximum standby current0.0001 A
Maximum slew rate0.03 mA
Nominal supply voltage (Vsup)5 V
surface mountYES
technologyCMOS
Temperature levelCOMMERCIAL
Terminal surfaceMatte Tin (Sn)
Terminal formJ BEND
Terminal pitch1.27 mm
Terminal locationQUAD
Maximum time at peak reflow temperatureNOT SPECIFIED
Base Number Matches1
M87C257
ADDRESS LATCHED
256K (32K x 8) UV EPROM and OTP EPROM
INTEGRATED ADDRESS LATCH
FAST ACCESS TIME: 45ns
LOW POWER “CMOS” CONSUMPTION:
– Active Current 30mA
– Standby Current 100µA
PROGRAMMING VOLTAGE: 12.75V
ELECTRONIC SIGNATURE for AUTOMATED
PROGRAMMING
PROGRAMMING TIMES of AROUND 3sec.
(PRESTO II ALGORITHM)
28
1
FDIP28W (F)
PLCC32 (C)
Figure 1. Logic Diagram
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.
VCC
15
A0-A14
8
Q0-Q7
E
G
M87C257
Table 1. Signal Names
A0 - A14
Q0 - Q7
E
G
ASV
PP
V
CC
V
SS
Address Inputs
Data Outputs
Chip Enable
Output Enable
Address Strobe / Program Supply
Supply Voltage
Ground
ASVPP
VSS
AI00928B
June 1996
1/13
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