M27C400 Datasheet, PDF (1/14 Pages) STMicroelectronics – 4 Mbit 512Kb x8 or 256Kb x16 UV EPROM and OTP EPROM

M27C400
4 Mbit (512Kb x8 or 256Kb x16) UV EPROM and OTP EPROM
s 5V ± 10% SUPPLY VOLTAGE in READ
OPERATION
s ACCESS TIME: 55ns
s BYTE-WIDE or WORD-WIDE
CONFIGURABLE
s 4 Mbit MASK ROM REPLACEMENT
s LOW POWER CONSUMPTION
– Active Current 70mA at 8MHz
– Stand-by Current 100µA
s PROGRAMMING VOLTAGE: 12.5V ± 0.25V
s PROGRAMMING TIME: 100µs/word
s ELECTRONIC SIGNATURE
– Manufacturer Code: 20h
– Device Code: B8h
DESCRIPTION
The M27C400 is an 4 Mbit EPROM offered in the
two ranges UV (ultra violet erase) and OTP (one
time programmable). It is ideally suited for micro-
processor systems requiring large data or program
storage. It is organised as either 512 Kwords of 8
bit or 256 Kwords of 16 bit. The pin-out is compat-
ible with the most common 8 Mbit Mask ROM.
The FDIP40W (window ceramic frit-seal package)
has a transparent lid which allows the user to ex-
pose the chip to ultraviolet light to erase the bit pat-
tern.
A new pattern can then be written rapidly to the de-
vice by following the programming procedure.
For applications where the content is programmed
only one time and erasure is not required, the
M27C400 is offered in PDIP40 package.
40
1
FDIP40W (F)
40
1
PDIP40 (B)
Figure 1. Logic Diagram
VCC
18
A0-A17
E
G
BYTEVPP
M27C400
Q15A–1
15
Q0-Q14
VSS
AI01634
May 1999
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