M48T559Y datasheet(5/18 Pages) STMICROELECTRONICS

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M48T559Y

Table 7. Power Down/Up Trip Points DC Characteristics (1)

(TA = 0 to 70 °C)

Note: 1. All voltages referenced to VSS.

2. At 25°C.

Table 8. Power Down/Up AC Characteristics

(TA = 0 to 70 °C)

Note: 1. VPFD (max) to VPFD (min) fall time of less than tF may result in deselection/write protection not occurring until 200µs after VCC pass-

es VPFD (min).

2. VPFD (min) to VSS fall time of less than tFB may cause corruption of RAM data.

Symbol

Parameter

Min

Typ

Max

Unit

VPFD

Power-fail Deselect Voltage

4.2

4.35

4.5

VSO

Battery Back-up Switchover Voltage

3.0

tDR

(2)

Expected Data Retention Time

YEARS

Symbol

Parameter

Min

Max

Unit

tPD

E at VIH before Power Down

µs

(1)

VPFD (max) to VPFD (min) VCC Fall Time

300

µs

tFB

(2)

VPFD (min) to VSS VCC Fall Time

µs

VPFD (min) to VPFD (max) VCC Rise Time

µs

tRB

VSS to VPFD (min) VCC Rise Time

1µs

tREC

VPFD (max) to RST High

200

Figure 5. Power Down/Up Mode AC Waveforms

AI01384D

VCC

INPUTS

RST

(PER CONTROL INPUT)

OUTPUTS

DON'T CARE

HIGH-Z

tFB

tREC

tPD

tRB

tDR

VALID

(PER CONTROL INPUT)

RECOGNIZED

VPFD (max)

VPFD (min)

VSO

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