M41ST85W datasheet(31/41 Pages) STMICROELECTRONICS

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M41ST85W

DC and AC parameters

31/41

Table 11.

DC characteristics

Sym

Parameter

Test condition(1)

Valid for Ambient Operating Temperature: TA = –40 to 85°C; VCC = 2.7 to 3.6V (except where noted).

M41ST85W

Unit

Min

Typ

Max

IBAT

(2)

Measured with VOUT and ECON open.

Battery current OSC ON

TA = 25°C, VCC = 0V, VBAT = 3V

400

500

Battery current OSC OFF

ICC1

Supply current

f = 400kHz

0.75

ICC2

Supply current (standby)

SCL, SDA = VCC – 0.3V

or VSS + 0.3V

0.50

ILI

(3)

RSTIN1 and RSTIN2 internally pulled-up to VCC through 100KΩ resistor. WDI internally pulled-down to VSS through

100K

Ω resistor.

Input leakage current

≤ VIN ≤ VCC

±1

µA

Input leakage current (PFI)

–25

ILO

(4)

Outputs Deselected.

Output leakage current

≤ VIN ≤ VCC

±1

µA

IOUT1

(5)

External SRAM must match RTC SUPERVISOR chip VCC specification.

VOUT current (active)

VOUT1 > VCC – 0.3V

100

IOUT2

VOUT current (battery back-up)

VOUT2 > VBAT – 0.3V

100

µA

VIH

Input high voltage

0.7VCC

VCC + 0.3

VIL

Input low voltage

–0.3

0.3VCC

VBAT

Battery voltage

2.5

3.0

3.5(6)

For rechargeable back-up, VBAT (max) may be considered VCC.

VOH

Output high voltage(7)

For PFO and SQW pins (CMOS).

IOH = –1.0mA

2.4

Pull-up supply voltage (open drain)

RST, IRQ/FT/OUT

3.6

VOHB

(8)

Conditioned output (ECON) can only sustain CMOS leakage current in the battery back-up mode. Higher leakage currents

will reduce battery life.

VOH (battery back-up)

IOUT2 = –1.0µA

2.5

2.9

3.5

VOL

Output low voltage

IOL = 3.0mA

0.4

Output low voltage (open drain)(9)

For IRQ/FT/OUT, RST pins (Open Drain): if pulled-up to supply other than VCC, this supply must be equal to, or less than

3.0V when VCC = 0V (during battery back-up mode).

IOL = 10mA

0.4

VPFD

Power fail deselect

2.55

2.60

2.70

VPFI

PFI input threshold

VCC = 3V(W)

1.225

1.250

1.275

PFI hysteresis

PFI Rising

VSO

Battery back-up switchover

2.5

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