W49F002U

Publication Release Date: April 2000

- 5 -

Revision A2

In addition to data polling, the W49F002U provides another method for determining the end of a

produce alternating 0's and 1's. When the program or erase cycle is completed, this toggling between

0's and 1's will stop. The device is then ready for the next operation.

Product Identification

The product ID operation outputs the manufacturer code and device code. Programming equipment

automatically matches the device with its proper erase and programming algorithms.

The manufacturer and device codes can be accessed by software or hardware operation. In the

software access mode, a three-byte (or JEDEC 3-byte) command sequence can be used to access

the product ID. A read from address 0000H outputs the manufacturer code DA(hex). A read from

address 0001H outputs the device code 0B(hex). The product ID operation can be terminated by a

three-byte command code sequence or an alternate one-byte command code sequence (see

Command Definition table).

In the hardware access mode, access to the product ID is activated by forcing CE and OE low, WE

high, and raising A9 to 12 volts.

TABLE OF OPERATING MODES

Operating Mode Selection

± 5%)

MODE

PINS

RESET

CE

OE

WE

ADDRESS

DQ.

Read

Dout

Write

Din

Standby

X

X

X

High Z

Write Inhibit

X

X

X

High Z/DOUT

X

X

X

High Z/DOUT

Output Disable

X

X

X

High Z

Reset Mode

X

X

X

X

High Z

Product ID

Manufacturer Code DA (Hex)

Device Code 0B (Hex)