M41T94(2003) 查看數據表（PDF） - STMicroelectronics
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M41T94 Datasheet PDF : 31 Pages
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M41T94
Table 6. DC Characteristics
Symb.
Parameter
Test Condition(1)
Min
Typ
Max Unit
Battery Current OSC ON
IBAT
Battery Current OSC OFF
TA = 25°C, VCC = 0V,
VBAT = 3V
400
500
nA
50
nA
ICC1 Supply Current
f = 2 MHz
2
mA
ICC2 Supply Current (Standby)
SCL, SDI = VCC – 0.3V
1.4
mA
ILI(2) Input Leakage Current
0V ≤ VIN ≤ VCC
±1
µA
ILO(3) Output Leakage Current
0V ≤ VOUT ≤ VCC
±1
µA
VIH Input High Voltage
0.7VCC
VCC + 0.3 V
VIL Input Low Voltage
–0.3
0.3VCC
V
VBAT Battery Voltage
2.5
3.5(6)
V
VOH Output High Voltage(4)
IOH = –1.0mA
2.4
V
Output Low Voltage(4)
VOL
Output Low Voltage (Open Drain)(5)
IOL = 3.0mA
IOL = 10mA
0.4
V
0.4
VPFD
Power Fail Deselect (THS = VCC)
Power Fail Deselect (THS = VSS)
4.20
4.40
4.50
V
2.55
2.60
2.70
VSO Battery Back-up Switchover
2.5
V
Note: 1. Valid for Ambient Operating Temperature: TA = –40 to 85°C; VCC = 2.7 to 5.5V (except where noted).
2. RSTIN1 and RSTIN2 internally pulled-up to VCC through 100KΩ resistor. WDI internally pulled-down to VSS through 100KΩ resistor.
3. Outputs Deselected.
4. For SQW pin (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 7. Crystal Electrical Characteristics (Externally Supplied)
Symbol
Parameter(1,2)
Typ
Min
Max
Unit
f0
Resonant Frequency
32.768
kHz
RS
Series Resistance
50
kΩ
CL
Load Capacitance
12.5
pF
Note: 1. Load capacitors are integrated within the M41T94. 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. These characteristics are externally supplied.
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.
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