M29W641DH datasheet(9/42 Pages) STMICROELECTRONICS

9 / 42 page

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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

Note: X = VIL or VIH.

Operation

Address Inputs

A0-A21

Data Inputs/Outputs

DQ15-DQ0

Bus Read

VIL

VIH

Cell Address

Data Output

Bus Write

VIL

VIH

VIL

Command Address

Data Input

Output Disable

VIH

Hi-Z

Standby

VIH

Hi-Z

Read Manufacturer

Code

VIL

VIH

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

Others VIL or VIH

0020h

Read Device Code

VIL

VIH

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

Others VIL or VIH

22C7h

Extended Memory

Block Verify Code

VIL

VIH

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

A9 = VID, Others VIL or VIH

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)

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