M41T94 datasheet(30/41 Pages) STMICROELECTRONICS

30 / 41 page

DC and AC parameters

M41T94

30/41

Table 13.

DC characteristics

Symb.

Parameter

Test condition(1)

Min

Typ

Max

Unit

IBAT

Battery current OSC on

TA = 25°C, VCC = 0 V,

VBAT = 3 V

400

500

Battery current OSC off

ICC1

Supply current

f = 2 MHz

ICC2

Supply current (standby)

SCL, SDI = VCC – 0.3 V

1.4

ILI

(2)

Input leakage current

0 V

≤ VIN ≤ VCC

±1

µA

ILO

(3)

Output leakage current

0 V

≤ 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

3.5(4)

VOH

Output high voltage(5)

IOH = –1.0 mA

2.4

VOL

Output low voltage(5)

IOL = 3.0 mA

0.4

Output low voltage (open drain)(6)

IOL = 10 mA

0.4

Pull-up supply voltage (open drain)

RST, IRQ/FT/OUT

5.5

VPFD

Power fail deselect (THS = VCC)

4.20

4.40

4.50

Power fail deselect (THS = VSS)

2.55

2.60

2.70

VSO

Battery backup switchover

2.5

Valid for ambient operating temperature: TA = –40 to 85°C; VCC = 2.7 to 5.5 V (except where noted).

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

100 K

Ω resistor.

Outputs deselected.

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

For SQW pin (CMOS).

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).

Table 14.

Crystal electrical characteristics (externally supplied)

Symbol

Parameter(1)(2)

Typ

Min

Max

Unit

Resonant frequency

32.768

kHz

Series resistance

Load capacitance

12.5

Load capacitors are integrated within the M41T94. 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. These characteristics are

externally supplied.

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. For contact information on this crystal type,

see Section 10: References on page 39.

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