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M27W801 Summary description
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1 Summary description
The M27W801 is a low voltage 8 Mbit EPROM offered in the two ranges UV (ultra violet
erase) and OTP (one time programmable). It is ideally suited for microprocessor systems
requiring large data or program storage and is organized as 1,048,576 by 8 bits.
The M27W801 operates in the read mode with a supply voltage as low as 2.7V at –40 to
85°C temperature range. The decrease in operating power allows either a reduction of the
size of the battery or an increase in the time between battery recharges.
The FDIP32W (window ceramic frit-seal package) has a transparent lids which allow 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 M27W801 is offered in PDIP32, PLCC32 and TSOP32 (8 x 20 mm) packages.
In order to meet environmental requirements, ST offers the M27W801 in ECOPACK®
packages.
ECOPACK packages are Lead-free. The category of second Level Interconnect is marked
on the package and on the inner box label, in compliance with JEDEC Standard JESD97.
The maximum ratings related to soldering conditions are also marked on the inner box label.
ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.
Figure 1. Logic diagram
Table 1. Signal names
A0-A19 Address Inputs
Q0-Q7 Data Outputs
E
Chip Enable
G
V
PP
Output Enable / Program Supply
V
CC
Supply Voltage
V
SS
Ground
AI02363
20
A0-A19 Q0-Q7
V
CC
M27W801
V
SS
8
GV
PP
E
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