M41T66 Datasheet, PDF (25/33 Pages) STMicroelectronics – Serial access real-time clock with alarms

M41T66
DC and AC parameters
Table 9. Capacitance
Symbol
Parameter⁽¹⁾⁽²⁾
Min Max Unit
C_IN
C_OUT(3)
Input capacitance
Output capacitance
t_LP
Low-pass filter input time constant (SDA and SCL)
1. Effective capacitance measured with power supply at 3.6 V; sampled only, not 100% tested.
2. At 25°C, f = 1 MHz.
3. Outputs deselected.
7
pF
10
pF
50
ns
Table 10. DC characteristics
Sym
Parameter
Test condition⁽¹⁾
Min Typ Max Unit
0°C to 85°C
1.0
4.4
V
V_CC(2) Operating voltage
Clock
–20°C to 85°C 1.3
–40°C to 85°C 1.5
I²C bus (400 kHz)
1.3
4.4
V
4.4
V
4.4
V
4.4 V
100 µA
I_CC1 Supply current
SCL = 400 kHz
(no load)
3.6 V
3.0 V
2.5 V
50
70
µA
35
µA
30
µA
2.0 V
20
µA
I_CC2 Supply current (standby)
SCL = 0 Hz
all inputs
SQW off
≥ V_CC – 0.2 V
≤ V_SS + 0.2 V
4.4 V
3.6 V
3.0 V at 25°C
1.8 V at 25°C
1100 nA
550 900 nA
525
nA
450
nA
V_IL Input low voltage
V_IH Input high voltage
V_OL Output low voltage
V_CC = 4.4 V, I_OL = 1.0 mA
(SQW, IRQ/OUT)
–0.2
0.7V_CC
0.3 V_CC V
V_CC+0.3 V
0.4
V
V_PU
Pull-up supply voltage
(open drain)
I_LI Input leakage current
I_LO Output leakage current
Square wave duty cycle⁽³⁾
IRQ/OUT
SQW
0V ≤ V_IN ≤ V_CC
0V ≤ V_OUT ≤ V_CC
No load
4.4
V
V_CC
V
±1 µA
±1 µA
40 50
60
%
1. Valid for ambient operating temperature: T_A = –40 to 85°C; V_CC = 1.5 V to 4.4 V (except where noted).
2. Oscillator startup guaranteed at 1.6 V only at 25°C.
3. Guaranteed by design.
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