DC and AC parameters

M41T56

18/27

Doc ID 6104 Rev 9

Figure 14.

Power down/up mode AC waveforms

Table 7.

DC characteristics

Symbol

Parameter

Test condition(1)

1.

Valid for ambient operating temperature: TA = –40 to 85 °C; VCC = 4.5 to 5.5 V (except where noted).

Min

Typ

Max

Unit

ILI

Input leakage current

0V

≤ VIN ≤ VCC

±1

µA

ILO

Output leakage current

0V

≤ VOUT ≤ VCC

±1

µA

ICC1

Supply current

Switch frequency = 100 kHz

300

µA

ICC2

Supply current (standby)

SCL, SDA = VCC – 0.3 V

100

µA

VIL

Input low voltage

–0.3

1.5

V

VIH

Input high voltage

3

VCC + 0.8

V

VOL

Output low voltage

IOL = 5mA, VCC = 4.5 V

0.4

V

VBAT

(2)

2.

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

Battery supply voltage

2.5

3

3.5

V

IBAT

Battery supply current

TA = 25 °C, VCC = 0 V,

oscillator ON, VBAT = 3 V

450

550

nA

Table 8.

Crystal electrical characteristics

Symbol

Parameter(1)(2)

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 25.

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

fO

Resonant frequency

32.768

kHz

RS

Series resistance

60

k

Ω

CL

Load capacitance

12.5

pF

AI00595

VCC

t

FB

t

REC

t

PD

t

RB

VPFD

VSO

DATA RETENTION TIME

SDA

SCL

IBAT