M29W641D View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

M29W641D

64 Mbit (4Mb x16, Uniform Block) 3V Supply Flash Memory

STMicroelectronics 

M29W641DH, M29W641DL, M29W641DU

VCCQ can be tied to VCC or can use a separate

supply.

VSS Ground. VSS is the reference for all voltage

measurements. The device features two VSS pins

which must be both connected to the system

ground.

Note: Each device in a system should have

VCC, VCCQ and VPP decoupled from VSS with a

0.1µF ceramic capacitor close to the pin for

current surge protection (high frequency, in-

herently low inductance capacitors should be

as close as possible to the device). See Figure

8, AC Measurement Load Circuit. The PCB

trace widths should be sufficient to carry the

required VPP program and erase currents. See

Table 9, DC Characteristics.

Table 2. Bus Operations

Operation

E

G

Bus Read

VIL

VIL

Bus Write

VIL

VIH

Output Disable

X

VIH

Standby

VIH

X

Read Manufacturer

Code

VIL

VIL

Read Device Code

VIL

VIL

W

Address Inputs

A0-A21

VIH Cell Address

VIL Command Address

VIH X

XX

VIH

A0 = VIL, A1 = VIL, A9 = VID,

Others VIL or VIH

VIH

A0 = VIH, A1 = VIL, A9 = VID,

Others VIL or VIH

Extended Memory

Block Verify Code

VIL

VIL

VIH

A0 = VIH, A1 = VIH, A6 = VIL,

A9 = VID, Others VIL or VIH

Note: X = VIL or VIH.

Data Inputs/Outputs

DQ15-DQ0

Data Output

Data Input

Hi-Z

Hi-Z

0020h

22C7h

98h (factory locked, WP protects

highest address block)

18h (not factory locked, WP

protects highest address

block)

88h (factory locked, WP protects

lowest block)

08h (not factory locked, WP

protects lowest block)

9/42

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