M41T01 datasheet(19/24 Pages) STMICROELECTRONICS

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DocID025389 Rev 2

19/24

M41T01

DC and AC parameters

1. Valid for Ambient Operating Temperature: TA = –40 to 85 °C; VCC = 2.0 to 5.5 V (except where noted).

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

3. After switchover (VSO), VBAT(min) can be 2.0 V for crystal with RS = 40 k.

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

Table 6. DC characteristics

Symbol

Parameter

Test condition(1)

Min

Typ

Max

Unit

ILI

Input leakage current

0 V

 VIN  VCC

±1

μA

ILO

Output leakage current

0 V

 VOUT  VCC

±1

μA

ICC1

Supply current

Switch frequency = 100 kHz

300

μA

ICC2

Supply current (standby)

SCL, SDA = VCC – 0.3 V

μA

VIL

Input low voltage

–0.3

0.3 VCC

VIH

Input high voltage

0.7 VCC

VCC + 0.5

VOL

Output low voltage

IOL = 3 mA

0.4

Pull-up supply voltage

(open drain)

FT/OUT

5.5

VBAT(2)

Battery supply voltage

2.5(3)

3.5(4)

IBAT

Battery supply current

TA = 25 °C, VCC = 0 V,

Oscillator ON, VBAT = 3 V

0.8

μA

Table 7. Crystal electrical characteristics

Symbol

Parameter (1)(2)

Min

Typ

Max

Unit

Resonant frequency

32.768

kHz

Series resistance



Load capacitance

12.5

1. These values 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.

2. Load capacitors are integrated within the M41T01. 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.

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