DC and AC parameters M41T80
20/27 Doc ID 9074 Rev 5
Table 10. 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 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 freq (SCL) = 400 kHz
3.0 V 30 µA
5.5 V 200 µA
I
CC2
(2)
2. At 25 °C.
Supply current
(standby)
All inputs = V
CC
– 0.2 V
Switch freq (SCL) = 0 Hz
32KE = 1
or
SQWE = 1
3.0 V 1.8 3.0 µA
5.5 V 35 µA
32KE = 0
and
SQWE = 0
3.0 V 1.5 2.4 µA
5.5 V 31 µA
V
IL
Input low voltage –0.3 0.3V
CC
V
V
IH
Input high voltage 0.7V
CC
V
CC
+ 0.3 V
V
OL
Output low voltage I
OL
= 3.0 mA 0.4 V
Output low voltage
(open drain)
(3)
3. For IRQ/FT/OUT, RST, and 32 KHz pins (open drain)
I
OL
= 10 mA 0.4 V
Pull-up supply voltage
(open drain)
IRQ
/OUT/SQW, F
32K
, SCL, SDA 5.5 V
Table 11. Crystal electrical characteristics
Sym Parameter
(1)
(2)
1. 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.
2. Load capacitors are integrated within the M41T80. 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 Units
f
O
Resonant frequency 32.768 kHz
R
S
Series resistance 60 kΩ
C
L
Load capacitance 12.5 pF
