DC and AC parameters M41T11
20/30 Doc ID 6103 Rev 10
Table 6. Capacitance
Symbol Parameter
(1)(2)
1. Effective capacitance measured with power supply at 5 V; sampled only, not 100% tested.
2. At 25°C, f = 1 MHz.
Min Max Unit
C
IN
Input capacitance (SCL) 7 pF
C
OUT
(3)
3. Outputs deselected.
Output capacitance (SDA, FT/OUT) 10 pF
t
LP
Low-pass filter input time constant (SDA and SCL) 250 1000 ns
Table 7. DC characteristics
Symbol Parameter Test Condition
(1)
1. Valid for ambient operating temperature: T
A
= –40 to 85°C; V
CC
= 2.0 to 5.5 V (except where noted).
Min Typ Max Unit
I
LI
Input leakage current 0V ≤ V
IN
≤ V
CC
±1 µA
I
LO
Output leakage current 0V ≤ V
OUT
≤ V
CC
±1 µA
I
CC1
Supply current Switch frequency = 100 kHz 300 µA
I
CC2
Supply current (standby) SCL, SDA = V
CC
– 0.3 V 70 µA
V
IL
Input low voltage –0.3 0.3V
CC
V
V
IH
Input high voltage 0.7V
CC
V
CC
+ 0.5 V
V
OL
Output low voltage I
OL
= 3 mA 0.4 V
Pull-up supply voltage
(open drain)
FT/OUT 5.5 V
V
BAT
(2)
2. STMicroelectronics recommends the RAYOVAC BR1225 or BR1632 (or equivalent) as the battery supply.
Battery supply voltage 2.5
(3)
3. After switchover (V
SO
), V
BAT
(min) can be 2.0 V for crystal with R
S
= 40 KΩ.
33.5
(4)
4. For rechargeable back-up, V
BAT
(max) may be considered V
CC
.
V
I
BAT
Battery supply current
T
A
= 25°C, V
CC
= 0 V,
oscillator ON, V
BAT
= 3 V
0.8 1 µA
Table 8. Crystal electrical characteristics
Symbol Parameter
(1)(2)(3)
1. These values are 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. Please refer to the KDS website for further information
on this crystal type.
2. Load capacitors are integrated within the M41T11. 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.
3. All SNAPHAT
®
battery:crystal tops meet these specifications.
Min Typ Max Unit
f
O
Resonant frequency 32.768 kHz
R
S
Series resistance 60
(4)
4. ESR (max) = 110 kΩ for V
CC
or V
BAT
> 2.5 V.
kΩ
C
L
Load capacitance 12.5 pF
