25CS160 datasheet(9/53 Pages) MICROCHIP

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Preliminary

DS20007008B-page 9

25CS160

1.1

Power-Up Requirements and

Default Conditions

During a power-up sequence, the VCC supplied to the

25CS160 should monotonically rise from VSS to the

minimum VCC level, as specified in Table 1-1, with a

slew rate no faster than 0.1 V/µs.

1.1.1

DEVICE POWER-ON RESET

To prevent spurious events from happening during a

power-up sequence, the 25CS160 includes a

Power-On Reset (POR) circuit. Upon power-up, the

device will not respond to any instructions until the VCC

level crosses the internal voltage threshold (VPOR) that

brings the device out of Reset and into Standby mode.

Microchip recommends that CS follows the rise of VCC

at power-up through the use of a pull-up resistor. The

system designer must ensure that no instruction is sent

to the device and CS is driven high until the VCC supply

reaches a stable value greater than the minimum VCC

level. Once VCC has surpassed the minimum level, the

SPI host must wait at least TVCSL before asserting the

CS pin. See Table 1-4 for the values associated with

these power-up parameters.

If an event occurs in the system where the VCC level

supplied to the 25CS160 drops below the maximum

VPOR level specified, it is recommended that a full

power cycle sequence be performed by first driving the

VCC pin to VSS, waiting at least the minimum TPOFF

time and then performing a new power-up sequence in

compliance with the requirements defined in this

section.

TABLE 1-3:

EEPROM CELL PERFORMANCE CHARACTERISTICS

Operation

Test Condition

Min.

Max.

Units

Write Endurance(1)

TA = +25°C

4,000,000

—

Write Cycles

TA = +85°C

1,200,000

—

TA = +125°C

600,000

—

TA = +150°C

400,000

—

Data Retention(1)

TA = +55°C

200

—

Years

Note 1: Performance is determined through characterization and the qualification process.

TABLE 1-4:

POWER-UP CONDITIONS

Symbol

Parameter

Min.

Max.

Units

TVCSL

Minimum VCC to Chip Select Low Time

100

—

µs

VPOR

Power-On Reset Threshold Voltage

—

1.5

TPOFF

Minimum time at VCC = 0V between power cycles

—

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