M48T37Y datasheet(23/30 Pages) STMICROELECTRONICS

23 / 30 page

M48T37Y, M48T37V

DC and AC parameters

Doc ID 7019 Rev 9

23/30

Note:

All voltages referenced to VSS.

Table 12.

Power down/up AC characteristics

Symbol

Parameter(1)

Valid for ambient operating temperature: TA = 0 to 70 °C or –40 to 85 °C; VCC = 4.5 to 5.5 V or 3.0 to 3.6 V

(except where noted).

Min

Max

Unit

(2)

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).

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

300

µs

tFB

(3)

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

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

µs

tREC

(4)

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

VPFD (max) to RST high

200

Table 13.

Power down/up trip points DC characteristics

Symbol

Parameter(1)

Valid for ambient operating temperature: TA = 0 to 70 °C or –40 to 85 °C; VCC = 4.5 to 5.5 V or 3.0 to 3.6 V

(except where noted).

Min

Typ

Max

Unit

VPFD

Power-fail deselect voltage

M48T37Y

4.2

4.4

4.5

M48T37V

2.7

2.9

3.0

VSO

Battery backup switchover voltage

M48T37Y

VBAT

M48T37V

VPFD –100 mV

tDR

(2)

At 25 °C, VCC = 0 V.

Expected data retention time

Grade 1

Years

Grade 6

10(3)

Using larger M4T32-BR12SH6 SNAPHAT® top (recommended for industrial temperature range - grade 6

device).

Years

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