M41T81

DC and AC parameters

23/30

Figure 15.

Power down/up mode AC waveforms

Table 9.

DC characteristics

Sym

Parameter

1.

Min

Typ

Max

Unit

Input leakage current

0V

±1

µA

Output leakage current

0V

±1

µA

Supply current

Switch freq = 400kHz

400

µA

Supply current (standby)

100

µA

Input low voltage

–0.3

V

Input high voltage

V

Output low voltage

0.4

V

Output low voltage (open

2.

For IRQ/FT/OUT/SQW pin (Open Drain)

0.4

V

Pull-up supply voltage

(open drain)

IRQ/OUT/FT/SQW

5.5

V

(3)

3.

STMicroelectronics recommends the RAYOVAC BR1225 or BR1632 (or equivalent) as the battery supply.

Battery supply voltage

4.

5.

V

Battery supply current

0.6

1

µA

Table 10.

Crystal electrical characteristics

Sym

1.

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. KDS can be contacted at kouhou@kdsj.co.jp or

http://www.kdsj.co.jp for further information on this crystal type.

2.

Load capacitors are integrated within the M41T81. Circuit board layout considerations for the 32.768kHz crystal of minimum trace lengths and

isolation from RF generating signals should be taken into account.

Min

Typ

Max

Units

Resonant frequency

32.768

kHz

Series resistance

60

k

Ω

Load capacitance

12.5

pF

AI00596

VCC

trec

tPD

VSO

SDA

SCL

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