Device description

M27W101

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2

Device description

The operating modes of the M27W101 are listed in the Operating Modes table. A single

on A9 for Electronic Signature.

Note:

2.1

Read mode

The M27W101 has two control functions, both of which must be logically active in order to

obtain data at the outputs. Chip Enable (E) is the power control and should be used for

device selection. Output Enable (G) is the output control and should be used to gate data to

the output pins, independent of device selection. Assuming that the addresses are stable,

2.2

Standby mode

The M27W101 has a standby mode which reduces the supply current from 15mA to 15µA

The M27W101 is placed in the standby mode by applying a CMOS high signal to the E

input. When in the standby mode, the outputs are in a high impedance state, independent of

the G input.

2.3

Two-line output control

Because EPROMs are usually used in larger memory arrays, this product features a 2-line

control function which accommodates the use of multiple memory connection.

The two line control function allows:

●

the lowest possible memory power dissipation,

●

complete assurance that output bus contention will not occur.

Table 2.

Operating modes

Mode

E

G

P

A9

Q7-Q0

Read

XX

Data Out

Output Disable

XX

Hi-Z

Program

X

Data In

Verify

Data Out

Program Inhibit

XXX

Hi-Z

Standby

XXX

Hi-Z

Electronic Signature

Codes