M41T81S datasheet(21/29 Pages) STMICROELECTRONICS

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M41T81S

Table 9. DC Characteristics

Note: 1. Valid for Ambient Operating Temperature: TA = –40 to 85°C; VCC = 2.7 to 5.5V (except where noted).

2. For IRQ/FT/OUT/SQW pin (Open Drain)

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

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

Table 10. Crystal Electrical Characteristics

Note: 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 con-

tacted 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 M41T81S. Circuit board layout considerations for the 32.768kHz crystal of minimum trace

lengths and isolation from RF generating signals should be taken into account.

3. For applications requiring back-up supply operation below 2.5V, RS (max) should be considered 40kΩ.

Sym

Parameter

Test Condition(1)

Min

Typ

Max

Unit

ILI

Input Leakage Current

≤ VIN ≤ VCC

±1

µA

ILO

Output Leakage Current

≤ VOUT ≤ VCC

±1

µA

ICC1

Supply Current

Switch Freq = 400kHz

400

µA

ICC2

Supply Current (standby)

SCL = 0Hz

All Inputs

≥ VCC – 0.2V

≤ VSS + 0.2V

100

µA

VIL

Input Low Voltage

–0.3

0.3VCC

VIH

Input High Voltage

0.7VCC

VCC + 0.3

VOL

Output Low Voltage

IOL = 3.0mA

0.4

Output Low Voltage (Open Drain)(2)

IOL = 10mA

0.4

Pull-up Supply Voltage (Open Drain)

IRQ/OUT/FT/SQW

5.5

VBAT

(3)

Back-up Supply Voltage

2.0

3.5(4)

IBAT

Battery Supply Current

TA = 25°C, VCC = 0V

Oscillator ON, VBAT = 3V

0.6

µA

Sym

Parameter(1,2)

Min

Typ

Max

Units

Resonant Frequency

32.768

kHz

Series Resistance

60(3)

Ω

Load Capacitance

12.5

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