M48T36 datasheet(5/17 Pages) STMICROELECTRONICS

5 / 17 page

Symbol

Parameter

Min

Max

Unit

tPD

E or W at VIH before Power Down

µs

(1)

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

300

µs

tFB

(2)

VPFD (min) to VSO VCC Fall Time

µs

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

µs

tRB

VSO to VPFD (min) VCC Rise Time

µs

tREC

VPFD (max) to RST High

200

Notes:1. VPFD (max) to VPFD (min) fall time of less than tF may result in deselection/write protection not occurring until 200

µs after

VCC passes VPFD (min).

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

Table 7. Power Down/Up Mode AC Characteristics (TA = 0 to 70

°C)

AI01384C

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

Figure 5. Power Down/Up Mode AC Waveforms

Symbol

Parameter

Min

Typ

Max

Unit

VPFD

Power-fail Deselect Voltage (M48T36Y)

4.2

4.35

4.5

VSO

Battery Back-up Switchover Voltage

3.0

tDR

(2)

Expected Data Retention Time

YEARS

Notes: 1. All voltages referenced to VSS.

2. @ 25

°C

Table 6. Power Down/Up Trip Points DC Characteristics (1) (TA =0 to 70

°C)

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