DC and AC parameters M41T56
18/27 Doc ID 6104 Rev 9
Figure 14. Power down/up mode AC waveforms
Table 7. DC characteristics
Symbol Parameter Test condition
(1)
1. Valid for ambient operating temperature: T
A
= –40 to 85 °C; V
CC
= 4.5 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 100 µA
V
IL
Input low voltage –0.3 1.5 V
V
IH
Input high voltage 3 V
CC
+ 0.8 V
V
OL
Output low voltage I
OL
= 5mA, V
CC
= 4.5 V 0.4 V
V
BAT
(2)
2. STMicroelectronics recommends the RAYOVAC BR1225 or BR1632 (or equivalent) as the battery supply.
Battery supply voltage 2.5 3 3.5 V
I
BAT
Battery supply current
T
A
= 25 °C, V
CC
= 0 V,
oscillator ON, V
BAT
= 3 V
450 550 nA
Table 8. Crystal electrical characteristics
Symbol Parameter
(1)(2)
1. These values are externally supplied for 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. For contact information on this crystal type, see Section 8:
References on page 25.
2. Load capacitors are integrated within the M41T56. 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.
Min Typ Max Unit
f
O
Resonant frequency 32.768 kHz
R
S
Series resistance 60 kΩ
C
L
Load capacitance 12.5 pF
AI00595
V
CC
t
FB
t
REC
t
PD
t
RB
V
PFD
V
SO
DATA RETENTION TIME
SDA
SCL
I
BAT
