M27W101

Summary description

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Summary description

The M27W101 is a low voltage 1 Mbit EPROM offered in two range 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 131,072 by 8 bits.

The M27W101 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 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 application where the content is programmed only one time and erasure is not required,

the M27W101 is offered in PDIP32, PLCC32 and TSOP32 (8 x 20 mm) packages.

In order to meet environmental requirements, ST offers the M27W101 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.

See Figure 1: Logic diagram and Table 1: Signal descriptions for a brief overview of the

signals connected to this device.

Figure 1.

Logic diagram

AI01587

17

A0-A16

P

Q0-Q7

VPP

VCC

M27W101

G

E

VSS

8