M41T94 datasheet(31/41 Pages) STMICROELECTRONICS

31 / 41 page

M41T94

DC and AC parameters

31/41

Table 13.

DC characteristics

Symb.

Parameter

Test condition(1)

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

Min

Typ

Max

Unit

IBAT

Battery current OSC on

TA = 25°C, VCC =

0V, VBAT = 3V

400

500

Battery current OSC off

ICC1

Supply current

f = 2 MHz

ICC2

Supply current (standby)

SCL, SDI =

VCC – 0.3V

1.4

ILI

(2)

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

VSS through 100KΩ resistor.

Input leakage current

≤ VIN ≤ VCC

±1

µA

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

3.5(4)

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

VOH

Output high voltage(5)

For SQW pin (CMOS).

IOH = –1.0mA

2.4

VOL

Output low voltage(5)

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

IOL = 10mA

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 back-up switchover

2.5

Table 14.

Crystal electrical characteristics (externally supplied)

Symbol

Parameter(1)(2)

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 9: References on page 39.

Typ

Min

Max

Unit

Resonant frequency

32.768

kHz

Series resistance

Load capacitance

12.5

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