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DC and AC parameters M41T256Y
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Table 8. DC characteristics
Table 9. Crystal electrical characteristics (externally supplied)
Sym Parameter Test condition
(1)
1. Valid for ambient operating temperature: T
A
= –25 to 70°C; V
CC
= 4.5 to 5.5V (except where noted).
Min Typ Max Unit
I
BAT
Battery current OSC ON T
A
= 25°C, V
CC
= 0V, V
BAT
= 3.0V 1.5 1.9 µA
Battery current OSC OFF 1.0 1.4 µA
I
CC1
Supply current f = 400kHz 1.4 3.0 mA
I
CC2
Supply current (standby) SCL, SDA = V
CC
– 0.3V 1.0 2.5 mA
I
LI
Input leakage current 0V ≤ V
IN
≤ V
CC
±1 µA
I
LO
(2)
2. Outputs deselected.
Output leakage current 0V ≤ V
OUT
≤ V
CC
±1 µA
V
IH
Input high voltage 0.7V
CC
V
CC
+ 0.3 V
V
IHB
Input high voltage in battery
back-up for tamper pin
V
BAT
– V
diode
V
BAT
V
V
IL
Input low voltage –0.3 0.3V
CC
V
V
BAT
Battery voltage 2.5 3.5 V
V
OH
Output high voltage V
CC
+ 0.3 V
V
OL
Output low voltage I
OL
= 3.0mA 0.4 V
Output low voltage (open
drain)
(3)
3. For RST and FT pin (open drain).
I
OL
= 10mA 0.4 V
V
PFD
Power fail deselect 4.20 4.50 V
V
SO
Battery back-up switchover V
BAT
V
R
SW
Switch resistance on tamper
pin
500 W
Symbol Parameter
(1)
1. Load capacitors are integrated within the M41T256Y. Circuit board layout considerations for the 32.768kHz crystal of
minimum trace lengths and isolation from RF generating signals should be taken into account.
Typ Min Max Unit
f
0
Resonant frequency 32.768 kHz
R
S
Series resistance 35 kΩ
C
L
Load capacitance 12.5 pF
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