M41ST84W datasheet(29/34 Pages) STMICROELECTRONICS

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M41ST84W

DC and AC parameters

29/34

Table 12.

DC characteristics

Table 13.

Crystal electrical characteristics (externally supplied)

Sym

Parameter

Test condition(1)

Valid for ambient operating temperature: TA = –40 to 85°C; VCC = 2.7 to 3.6 V (except where noted).

M41ST84W

Unit

Min

Typ

Max

IBAT

Battery current OSC ON

TA = 25°C, VCC = 0 V,

VBAT = 3 V

400

500

Battery current OSC OFF

ICC1

Supply current

f = 400 kHz

0.75

ICC2

Supply current (standby)

SCL, SDA = VCC – 0.3 V

or VSS + 0.3 V

0.50

ILI

(2)

RSTIN internally pulled-up to VCC through 100 KΩ resistor. WDI internally pulled-down to VSS through 100 KΩ resistor.

Input leakage current

≤ VIN ≤ VCC

±1

µA

Input leakage current (PFI)

–25

ILO

(3)

Outputs deselected.

Output leakage current

≤ VOUT ≤ VCC

±1

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(4)

For rechargeable backup, VBAT (max) may be considered VCC.

VOH

Output high voltage(5)

For PFO and SQW pins (CMOS).

IOH = –1.0mA

2.4

VOL

Output low voltage

IOL = 3.0mA

0.4

Output low voltage (open drain)(6)

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

3.0 V when VCC = 0 V (during battery backup mode).

IOL = 10mA

0.4

Pull-up supply voltage (open

drain)

RST, IRQ/FT/OUT

3.6

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 backup switchover

2.5

Symbol

Parameter(1)(2)

Load capacitors are integrated within the M41ST84W. Circuit board layout considerations for the 32.768 kHz crystal of

minimum trace lengths and isolation from RF generating signals should be taken into account.

STMicroelectronics recommends the KDS DT-38: 1TA/1TC252E127, tuning fork type (thru-hole) or the DMX-26S:

1TJS125FH2A212, (SMD) quartz crystal for industrial temperature operations. KDS can be contacted at

http://www.kds.info/index_en.htm for further information on this crystal type.

Typ

Min

Max

Unit

Resonant frequency

32.768

kHz

Series resistance

Load capacitance

12.5

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