M41ST84W datasheet(24/29 Pages) STMICROELECTRONICS

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M41ST84W

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Table 12. DC Characteristics

Note: 1. Valid for Ambient Operating Temperature: TA = –40 to 85°C; VCC = 2.7 to 3.6V (except where noted).

2. RSTIN internally pulled-up to VCC through 100KΩ resistor. WDI internally pulled-down to VSS through 100KΩ resistor.

3. Outputs deselected.

4. For PFO and SQW pins (CMOS).

5. For IRQ/FT/OUT, RST pins (Open Drain): if pulled-up to supply other than VCC, this supply must be equal to, or less than 3.0V when

VCC = 0V (during battery back-up mode).

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

Table 13. Crystal Electrical Characteristics (Externally Supplied)

Note: 1. Load capacitors are integrated within the M41ST84W. Circuit board layout considerations for the 32.768kHz crystal of minimum

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

2. 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 ht-

tp://www.kdsj.co.jp for further information on this crystal type.

Sym

Parameter

Test Condition(1)

M41ST84W

Unit

Min

Typ

Max

IBAT

Battery Current OSC ON

TA = 25°C, VCC = 0V,

VBAT = 3V

400

500

Battery Current OSC OFF

ICC1

Supply Current

f = 400kHz

0.75

ICC2

Supply Current (Standby)

SCL, SDA = VCC – 0.3V

or VSS + 0.3V

0.50

ILI

(2)

Input Leakage Current

≤ VIN ≤ VCC

±1

µA

Input Leakage Current (PFI)

–25

ILO

(3)

Output Leakage Current

≤ VOUT ≤ VCC

±1

µA

VIH

Input High Voltage

0.7VCC

VCC + 0.3

VIL

Input Low Voltage

–0.3

0.3VCC

VBAT

Battery Voltage

2.5

3.0

3.5(6)

VOH

Output High Voltage(4)

IOH = –1.0mA

2.4

VOL

Output Low Voltage

IOL = 3.0mA

0.4

Output Low Voltage (Open Drain)(5)

IOL = 10mA

0.4

Pull-up Supply Voltage (Open Drain)

RST, IRQ/FT/OUT

3.6

VPFD

Power Fail Deselect

2.55

2.60

2.70

VPFI

PFI Input Threshold

VCC = 3V(W)

1.225

1.250

1.275

PFI Hysteresis

PFI Rising

VSO

Battery Back-up Switchover

2.5

Symbol

Parameter(1,2)

Typ

Min

Max

Unit

Resonant Frequency

32.768

kHz

Series Resistance

Ω

Load Capacitance

12.5

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