M41T00 Просмотр технического описания (PDF) - STMicroelectronics

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M41T00

Serial real-time clock

STMicroelectronics 

DC and AC parameters

M41T00

Table 9.

Symbol

DC characteristics

Parameter

Test condition(1)

Min Typ

Max

Unit

ILI Input leakage current

0 V = VIN = VCC

ILO Output leakage current

0 V = VOUT = VCC

ICC1 Supply current

Switch frequency = 100 kHz

ICC2 RTC supply current (standby)

SCL, SDA = VCC – 0.3 V

VIL Input low voltage

–0.3

VIH Input high voltage

0.7 VCC

VOL Output low voltage

IOL = 3.0 mA

Output low voltage (open drain)

FT/OUT

±1

µA

±1

µA

300

µA

70

µA

0.3VCC

V

VCC + 0.5 V

0.4

V

5.5

V

VBAT(2) Battery supply voltage

IBAT Battery supply current

2.5(3)

3.5(4)

V

TA = 25 °C, VCC = 0 V

oscillator ON, VBAT = 3 V

0.8

1

µA

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

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

Table 10. Crystal electrical characteristics

Symbol

Parameter (1)(2)

Min

Typ

Max

Units

fO

Resonant frequency

RS

Series resistance

CL

Load capacitance

32.768

kHz

60

KΩ

12.5

pF

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 contacted 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 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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