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Table 14. DC Characteristics

2. Oscillator start-up guaranteed at 1.5V only.

Table 15. Crystal Electrical Characteristics

Note: 1. Externally supplied if using the QFN16 package. STMicroelectronics recommends the Citizen CFS-145 (1.5x5mm) and the KDS

DT-38 (3x8mm) for thru-hole, or the KDS DMX-26S (3.2x8mm) for surface-mount, tuning fork-type quartz crystals.

KDS can be contacted at kouhou@kdsj.co.jp or http://www.kdsj.co.jp.

Citizen can be contacted at csd@citizen-america.com or http://www.citizencrystal.com.

2. Load capacitors are integrated within the M41T6x. 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. Guaranteed by design.

Sym

Parameter

Min

Typ

Max

Unit

(3)

Operating Voltage

1.0

3.6

V

1.3

3.6

V

Supply Current

SCL = 400kHz

(No load)

3.6V

50

100

µA

3.0V

35

µA

2.5V

30

µA

2.0V

20

µA

Supply Current (standby)

SCL = 0Hz

All inputs

SQW Off

3.6V

375

700

nA

3.0V @ 25°C

350

nA

2.0V @ 25°C

310

nA

Input Low Voltage

–0.2

V

Input High Voltage

V

Output Low Voltage

(CMOS or Open Drain)

0.4

V

(SQW, WDO, IRQ)

0.4

V

Output High Voltage

2.4

V

Pull-up Supply Voltage

(Open Drain)

IRQ/OUT, IRQ/FT/OUT, WDO, SQW

(M41T64 only)

3.6

V

Input Leakage Current

0V

±1

µA

Output Leakage Current

0V

±1

µA

Sym

Min

Typ

Max

Units

Resonant Frequency

32.768

kHz

Series Resistance

k

Ω

Load Capacitance

6

pF