M95080-WBN3T datasheet(9/40 Pages) STMICROELECTRONICS

Part #	M95080-WBN3T

Description	16Kbit and 8Kbit Serial SPI Bus EEPROM With High Speed Clock

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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M95160, M95080

OPERATING FEATURES

Power-up

When the power supply is turned on, VCC rises

from VSS to VCC.

During this time, the Chip Select (S) must be al-

lowed to follow the VCC voltage. It must not be al-

lowed to float, but should be connected to VCC via

a suitable pull-up resistor.

As a built in safety feature, Chip Select (S) is edge

sensitive as well as level sensitive. After Power-

up, the device does not become selected until a

falling edge has first been detected on Chip Select

(S). This ensures that Chip Select (S) must have

been High, prior to going Low to start the first op-

eration.

Power On Reset: VCC Lock-Out Write Protect

In order to prevent data corruption and inadvertent

Write instructions during Power-up, a Power On

Reset (POR) circuit is included. The internal reset

is held active until VCC has reached the Power On

Reset (POR) threshold voltage, and all operations

are disabled – the device will not respond to any

instruction. In the same way, when VCC drops from

the operating voltage, below the Power On Reset

(POR) threshold voltage, all operations are dis-

abled and the device will not respond to any in-

struction.

A stable and valid VCC must be applied before ap-

plying any logic signal.

Power-down

At Power-down, the device must be deselected.

Chip Select (S) should be allowed to follow the

voltage applied on VCC.

Active Power and Standby Power Modes

When Chip Select (S) is Low, the device is select-

ed, and in the Active Power mode. The device

consumes ICC, as specified in Table 14. to Table

18..

When Chip Select (S) is High, the device is dese-

lected. If an Erase/Write cycle is not currently in

progress, the device then goes in to the Standby

Power mode, and the device consumption drops

to ICC1.

Hold Condition

The Hold (HOLD) signal is used to pause any se-

rial communications with the device without reset-

ting the clocking sequence.

During the Hold condition, the Serial Data Output

(Q) is high impedance, and Serial Data Input (D)

and Serial Clock (C) are Don’t Care.

To enter the Hold condition, the device must be

selected, with Chip Select (S) Low.

Normally, the device is kept selected, for the whole

duration of the Hold condition. Deselecting the de-

vice while it is in the Hold condition, has the effect

of resetting the state of the device, and this mech-

anism can be used if it is required to reset any pro-

cesses that had been in progress.

The Hold condition starts when the Hold (HOLD)

signal is driven Low at the same time as Serial

Clock (C) already being Low.

The Hold condition ends when the Hold (HOLD)

signal is driven High at the same time as Serial

Clock (C) already being Low.

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