M48T35 datasheet(6/18 Pages) STMICROELECTRONICS

部品番号	M48T35

部品情報	256 Kbit 32Kb x8 TIMEKEEPER SRAM

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メーカー	STMICROELECTRONICS [STMicroelectronics]

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M48T35, M48T35Y

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Table 8. Power Down/Up AC Characteristics

(TA = 0 to 70 °C or –40 to 85 °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.

3. tREC (min) = 20ms for industrial temperature grade (6) device.

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 VSS VCC Fall Time

µs

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

µs

tRB

VSS to VPFD (min) VCC Rise Time

1µs

tREC

(3)

VPFD (max) to Inputs Recognized

200

Figure 5. Power Down/Up Mode AC Waveforms

AI01168C

VCC

INPUTS

(PER CONTROL INPUT)

OUTPUTS

DON'T CARE

HIGH-Z

tFB

tPD

tRB

tDR

VALID

(PER CONTROL INPUT)

RECOGNIZED

VPFD (max)

VPFD (min)

VSO

tREC

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