DC and AC parameters

M41T56

18/25

Figure 14.

Power down/up mode AC waveforms

Table 7.

DC characteristics

Symbol

Parameter

1.

Min

Typ

Max

Unit

Input leakage current

0V

±1

µA

Output leakage current

0V

±1

µA

Supply current

Switch frequency = 100kHz

300

µA

Supply current (standby)

100

µA

Input low voltage

–0.3

1.5

V

Input high voltage

3

V

Output low voltage

0.4

V

(2)

2.

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

Battery supply voltage

2.5

3

3.5

V

Battery supply current

450

550

nA

Table 8.

Crystal electrical characteristics

Symbol

1.

These values are externally supplied for 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. For contact information on this crystal type, see Section 8:

References on page 23.

2.

Load capacitors are integrated within the M41T56. 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.

Min

Typ

Max

Unit

Resonant frequency

32.768

kHz

Series resistance

60

k

Ω

Load capacitance

12.5

pF

AI00595

VCC

tFB

tREC

tPD

tRB

VPFD

VSO

DATA RETENTION TIME

SDA

SCL

IBAT