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M87C257-20XC7TR

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

M87C257-20XC7TR Overview

32K X 8 UVPROM, 90 ns, CDIP28

M87C257-20XC7TR Parametric

Parameter NameAttribute value
Is it Rohs certified?conform to
Parts packaging codeQFJ
package instructionPLASTIC, LCC-32
Contacts32
Reach Compliance Codecompli
ECCN codeEAR99
Maximum access time150 ns
I/O typeCOMMON
JESD-30 codeR-PQCC-J32
JESD-609 codee3
length13.995 mm
memory density262144 bi
Memory IC TypeOTP ROM
memory width8
Number of functions1
Number of terminals32
word count32768 words
character code32000
Operating modeASYNCHRONOUS
Maximum operating temperature105 °C
Minimum operating temperature-40 °C
organize32KX8
Output characteristics3-STATE
Package body materialPLASTIC/EPOXY
encapsulated codeQCCJ
Encapsulate equivalent codeLDCC32,.5X.6
Package shapeRECTANGULAR
Package formCHIP CARRIER
Parallel/SerialPARALLEL
Peak Reflow Temperature (Celsius)NOT SPECIFIED
power supply5 V
Certification statusNot Qualified
Maximum seat height3.56 mm
Maximum standby current0.0001 A
Maximum slew rate0.03 mA
Maximum supply voltage (Vsup)5.25 V
Minimum supply voltage (Vsup)4.75 V
Nominal supply voltage (Vsup)5 V
surface mountYES
technologyCMOS
Temperature levelINDUSTRIAL
Terminal surfaceMatte Tin (Sn)
Terminal formJ BEND
Terminal pitch1.27 mm
Terminal locationQUAD
Maximum time at peak reflow temperatureNOT SPECIFIED
width11.455 mm
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
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