M41T00S datasheet(20/25 Pages) STMICROELECTRONICS

20 / 25 page

DC and AC parameters

M41T00

20/25

Table 9.

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

RTC supply current (standby)

SCL, SDA = VCC – 0.3 V

µA

VIL

Input low voltage

–0.3

0.3VCC

VIH

Input high voltage

0.7 VCC

VCC + 0.5

VOL

Output low voltage

IOL = 3.0 mA

0.4

Output low 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

Valid for ambient operating temperature: TA = –40 to 85 °C; VCC = 2.0 to 5.5 V (except where otherwise noted).

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

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

For rechargeable backup, VBAT(max) may be considered VCC.

Table 10.

Crystal electrical characteristics

Symbol

Parameter (1)(2)

Min

Typ

Max

Units

Resonant frequency

32.768

kHz

Series resistance

Load capacitance

12.5

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.

Load capacitors are integrated within the M41T00. 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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