M27C256B-70F7TR View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
M27C256B-70F7TR Datasheet PDF : 15 Pages
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M27C256B
256 Kbit (32Kb x 8) UV EPROM and OTP EPROM
5V ± 10% SUPPLY VOLTAGE in READ
OPERATION
FAST ACCESS TIME: 45ns
LOW POWER CONSUMPTION:
– Active Current 30mA at 5MHz
– Standby Current 100µA
PROGRAMMING VOLTAGE: 12.75V ± 0.25V
PROGRAMMING TIME: 100µs/byte
(PRESTO II ALGORITHM)
ELECTRONIC SIGNATURE
– Manufacturer Code: 20h
– Device Code: 8Dh
28
1
FDIP28W (F)
28
1
PDIP28 (B)
DESCRIPTION
The M27C256Bis a 256 KbitEPROM offeredin the
two ranges UV (ultra violet erase) and OTP (one
time programmable). It is ideally suited for micro-
processor systems and is organized as 32,768 by
8 bits.
The FDIP28W (window ceramic frit-seal package)
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
M27C256B is offered in PDIP32, PLCC32 and
TSOP28 (8 x 13.4 mm) packages.
PLCC32 (C)
TSOP28 (N)
8 x 13.4mn
Figure 1. Logic Diagram
VCC VPP
15
A0-A14
8
Q0-Q7
Table 1. Signal Names
A0-A14
Address Inputs
Q0-Q7
Data Outputs
E
Chip Enable
G
Output Enable
VPP
Program Supply
VCC
Supply Voltage
VSS
Ground
E
M27C256B
G
VSS
AI00755B
July 1998
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