M41T81
DC and AC parameters
Table 9.
Sym
DC characteristics
Parameter
Test condition(1)
Min
Typ
Max
Unit
ILI
Input leakage current
Output leakage current
0V ≤VIN ≤VCC
0V ≤VOUT ≤VCC
1
1
µA
µA
µA
µA
V
ILO
ICC1 Supply current
ICC2 Supply current (standby)
Switch freq = 400kHz
SCL,SDA = VCC – 0.3V
400
100
VIL
VIH
Input low voltage
Input high voltage
Output low voltage
–0.3
0.3VCC
VCC + 0.3
0.4
0.7VCC
V
IOL = 3.0mA
IOL = 10mA
V
V
OL
Output low voltage (open
drain)(2)
0.4
V
Pull-up supply voltage
(open drain)
IRQ/OUT/FT/SQW
5.5
3.5(5)
1
V
V
2.5(4)
3
(3)
VBAT
Battery supply voltage
TA = 25°C, VCC = 0V
IBAT Battery supply current
0.6
µA
oscillator on, VBAT = 3V
1. Valid for Ambient Operating Temperature: T = –40 to 85°C; V = 2.0 to 5.5V (except where noted).
A
CC
2. For IRQ/FT/OUT/SQW pin (Open Drain)
3. STMicroelectronics recommends the RAYOVAC BR1225 or BR1632 (or equivalent) as the battery supply.
4. After switchover (V ), V (min) can be 2.0V for crystal with R = 40KΩ.
SO
BAT
S
5. For rechargeable back-up, V
(max) may be considered V
.
CC
BAT
Table 10.
Sym
Crystal electrical characteristics
Parameter(1) (2)
Min
Resonant frequency
Typ
Max
Units
fO
RS
CL
32.768
kHz
kΩ
pF
Series resistance
Load capacitance
60
12.5
1. Externally supplied. 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 M41T81. Circuit board layout considerations for the 32.768kHz crystal of minimum trace lengths and
isolation from RF generating signals should be taken into account.
Figure 15. Power down/up mode AC waveforms
V
CC
V
SO
tPD
trec
SDA
SCL
DON'T CARE
AI00596
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STMICROELECTRONICS [ ST ]
