DC and AC parameters

M41T80

20/25

Table 10.

DC characteristics

Symbol

Parameter

Min

Typ

Max

Unit

Input leakage current

0V

≤V

±1

µA

Output leakage current

0V

≤V

±1

µA

Supply current

Switch freq (SCL) = 400kHz

3.0V

30

µA

5.5V

200

µA

(2)

2. At 25°C.

Supply current

(standby)

Switch freq (SCL) = 0Hz

32KE = 1

or

SQWE = 1

3.0V

1.8

3.0

µA

5.5V

35

µA

32KE = 0

and

SQWE = 0

3.0V

1.5

2.4

µA

5.5V

31

µA

Input low voltage

–0.3

V

Input high voltage

V

Output low voltage

0.4

V

Output low voltage

3. For IRQ/FT/OUT, RST, and 32kHz pins (Open Drain)

0.4

V

Pull-up supply voltage

(open drain)

5.5

V

Table 11.

Crystal electrical characteristics

Sym

1.

Externally supplied if using the SO8 package. 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 M41T80. 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