DocID025389 Rev 2 19/24
M41T01 DC and AC parameters
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1. Valid for Ambient Operating Temperature: T
A
= –40 to 85 °C; V
CC
= 2.0 to 5.5 V (except where noted).
2. STMicroelectronics recommends the RAYOVAC BR1225 or BR1632 (or equivalent) as the battery supply.
3. After switchover (V
SO
), V
BAT
(min) can be 2.0 V for crystal with R
S
= 40 k.
4. For rechargeable back-up, V
BAT
(max) may be considered V
CC
.
Table 6. DC characteristics
Symbol Parameter Test condition
(1)
Min Typ Max Unit
I
LI
Input leakage current 0 V V
IN
V
CC
±1 μA
I
LO
Output leakage current 0 V 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 0.3 V
CC
V
V
IH
Input high voltage 0.7 V
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)
Battery supply voltage 2.5
(3)
3 3.5
(4)
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 7. Crystal electrical characteristics
Symbol Parameter
(1)(2)
Min Typ Max Unit
f
O
Resonant frequency 32.768 kHz
R
S
Series resistance 60 k
C
L
Load capacitance 12.5 pF
1. These values are 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.
2. Load capacitors are integrated within the M41T01. 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.
