M41T81 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'M41T81' PDF : 28 Pages View PDF
M41T81
Table 5. DC Characteristics
Sym
Parameter
Test Condition(1)
Min
Typ
Max Unit
ILI Input Leakage Current
0V ≤ VIN ≤ VCC
±1
µA
ILO Output Leakage Current
0V ≤ VOUT ≤ VCC
±1
µA
ICC1 Supply Current
Switch Freq = 400kHz
400
µA
ICC2 Supply Current (standby)
SCL,SDA = VCC – 0.3V
100
µA
VIL Input Low Voltage
–0.3
0.3VCC
V
VIH Input High Voltage
0.7VCC
VCC + 0.3 V
Output Low Voltage
VOL
Output Low Voltage (Open Drain)(5)
IOL = 3.0mA
IOL = 10mA
0.4
V
0.4
V
VBAT(2) Battery Supply Voltage
2.5(3)
3
3.5(4)
V
IBAT Battery Supply Current
TA = 25°C, VCC = 0V
Oscillator ON, VBAT = 3V
0.6
1
µA
Note: 1. Valid for Ambient Operating Temperature: TA = –40 to 85°C; VCC = 2.0 to 5.5V (except where noted).
2. STMicroelectronics recommends the RAYOVAC BR1225 or BR1632 (or equivalent) as the battery supply.
3. After switchover (VSO), VBAT (min) can be 2.0V for crystal with RS = 40KΩ.
4. For rechargeable back-up, VBAT (max) may be considered VCC.
5. For IRQ/FT/OUT/SQW pin (Open Drain)
Table 6. Crystal Electrical Characteristics
Sym
Parameter(1,2,3)
Min
Typ
Max
Units
fO
Resonant Frequency
32.768
kHz
RS
Series Resistance
60
kΩ
CL
Load Capacitance
12.5
pF
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 M41T81. 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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