M48Z35PC View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

M48Z35PC

256Kbit (32Kbit x 8) ZEROPOWER® SRAM

STMicroelectronics 

Operating modes

M48Z35, M48Z35Y

For more information on Battery Storage Life refer to the Application Note AN1012.

Figure 8. Power down/up mode AC waveforms

VCC

VPFD (max)

VPFD (min)

VSO

tF

tFB

tPD

INPUTS

RECOGNIZED

OUTPUTS

VALID

(PER CONTROL INPUT)

tRB

tDR

DON'T CARE

HIGH-Z

tR

trec

RECOGNIZED

VALID

(PER CONTROL INPUT)

AI01168C

Table 5. Power down/up AC characteristics

Symbol

Parameter(1)

Min

Max

Unit

tPD

E or W at VIH before power down

0

µs

tF(2)

VPFD (max) to VPFD (min) VCC fall time

300

µs

tFB(3)

VPFD (min) to VSS VCC fall time

10

µs

tR

VPFD (min) to VPFD (max) VCC rise time

10

µs

tRB

VSS to VPFD (min) VCC rise time

1

µs

trec

VPFD (max) to inputs recognized

40

200

ms

1. Valid for ambient operating temperature: TA = 0 to 70°C; VCC = 4.75 to 5.5V or 4.5 to 5.5V (except where noted).

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

VCC passes VPFD (min).

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

Table 6. Power down/up trip points DC characteristics

Symbol

Parameter(1)

Min

Typ

Max

Unit

VPFD Power-fail deselect voltage

M48Z35

4.5

M48Z35Y

4.2

4.6

4.75

4.35

4.5

VSO Battery back-up switchover voltage M48Z35/Y

3.0

tDR(2) Expected data retention time

10

1. Valid for ambient operating temperature: TA = 0 to 70°C; VCC = 4.75 to 5.5V or 4.5 to 5.5V (except where noted).

2. At 25°C, VCC = 0V.

Note:

All voltages referenced to VSS.

V

V

V

YEARS

12/23

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