W27L01

Publication Release Date: February 20, 2003

- 3 -

Revision A3

Two-line Output Control

Since EPROMs are often used in large memory arrays, the W27L01 provides two control inputs for

multiple memory connections. Two-line control provides for lowest possible memory power dissipation

and ensures that data bus contention will not occur.

System Considerations

EPROM power switching characteristics require careful device decoupling. System designers are

transient current peaks produced by the falling and rising edges of #CE. Transient current magnitudes

depend on the device output's capacitive and inductive loading. Two-line control and proper decoupling

capacitor selection will suppress transient voltage peaks. Each device should have a 0.1

µF ceramic

should be placed as close as possible to the device. Additionally, for every eight devices, a 4.7

µF

The bulk capacitor will overcome voltage slumps caused by PC board trace inductances.

Table of Operating Modes

PINS

MODE

#CE

#OE

#PGM

A0

A9

OUTPUTS

Read

X

X

X

Output Disable

X

X

X

High Z

Standby (TTL)

X

X

X

X

High Z

Standby (CMOS)

±0.3V

X

X

X

X

High Z

Program

X

X

Program Verify

X

X

Program Inhibit

X

X

X

X

High Z

Erase

FF (Hex)

Erase Verify

X

X

Erase Inhibit

X

X

X

X

High Z

Product

Identifier-Manufacturer

X

DA (Hex)

Product Identifier-Device

X

01 (Hex)