M41T81S View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'M41T81S' PDF : 31 Pages View PDF
DC and AC parameters
M41T81S
Table 9.
Sym
DC characteristics
Parameter
Test Condition(1)
Min
Typ
Max Unit
ILI Input Leakage Current
ILO Output Leakage Current
ICC1 Supply Current
ICC2 Supply Current (standby)
VIL Input Low Voltage
VIH Input High Voltage
0V ≤ VIN ≤ VCC
0V ≤ VOUT ≤ VCC
Switch Freq = 400kHz
SCL = 0Hz
All Inputs
≥ VCC – 0.2V
≤ VSS + 0.2V
–0.3
0.7VCC
±1 μA
±1 μA
400 μA
100 μA
0.3VCC V
VCC +
0.3
V
Output Low Voltage
VOL Output Low Voltage (Open
Drain)(2)
IOL = 3.0mA
IOL = 10mA
0.4 V
0.4 V
Pull-up Supply Voltage (Open
Drain)
IRQ/OUT/FT/SQW
VBAT(3) Back-up Supply Voltage
2.0
IBAT Battery Supply Current
TA = 25°C, VCC = 0V
Oscillator ON, VBAT =
3V
5.5 V
3.5(4) V
0.6
1
µA
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
Sym
fO
RS
CL
Parameter(1)and(2)
Resonant Frequency
Series Resistance
Load Capacitance
Min
Typ
Max Units
32.768
kHz
60(3)
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 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.
Figure 16. Power down/up mode AC waveforms
VCC
VSO
tPD
SDA
SCL
DON'T CARE
trec
AI00596
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