Datasheet

Sym Parameter Conditions Min. Typ. Max. Unit
C
d
XOUT capacitance 12 pF
IC-to-IC frequency variation
(1) (2)
–10 +10 ppm
1. Devices in LCC8 package ((M41T62LC6F) are tested not to exceed ±20 ppm oscillator frequency error at
25 °C, which equates to about 52 seconds per month.
2. Reference value. T
A
= 25 °C, V
CC
= 3.0 V, CMJ-145 (C
L
= 6 pF, 32.768 Hz) manufactured by Citizen, C
L
=
C
g
· C
d
/ (C
g
+ C
d
).
Figure 24. Bus timing requirements sequence
SDA
P
t
SU:STO
t
SU:STA
t
HD:STA
SR
SCL
t
SU:DAT
t
F
t
HD:DAT
t
R
t
HIGH
t
LOW
t
HD:STA
t
BUF
SP
Table 17. AC characteristics
Sym
Parameter
(1)
Min. Max. Units
f
SCL
SCL clock frequency 0 400 kHz
t
LOW
Clock low period 1.3 µs
t
HIGH
Clock high period 600 ns
t
R
SDA and SCL rise time 300 ns
t
F
SDA and SCL fall time 300 ns
t
HD:STA
START condition hold time
(after this period the first clock pulse is generated)
600 ns
t
SU:STA
START condition setup time
(only relevant for a repeated start condition)
600 ns
t
SU:DAT
(2)
Data set-up time 100 ns
t
HD:DAT
Data hold time 0 µs
t
SU:STO
STOP condition setup time 600 ns
t
BUF
Time the bus must be free before a new
transmission can start
1.3 µs
t
rec
Watchdog output pulse width 96 98 ms
1. Valid for ambient operating temperature: T
A
= –40 to 85 °C; V
CC
= 1.3 to 4.4 V (except where noted).
2. Transmitter must internally provide a hold time to bridge the undefined region (300 ns max.) of the falling edge of SCL.
M41T62, M41T64, M41T65
DC and AC parameters
DS3840 - Rev 24
page 26/42