Datasheet

DC and AC parameters M41T60
22/28 DocID10396 Rev 14
Figure 16. Bus timing requirements sequence
Note: P = STOP and S = START
Table 10. Oscillator characteristics
Symbol Parameter Conditions Min Typ Max Unit
V
STA
Oscillator start voltage ≤ 10 seconds 1.5 V
t
STA
Oscillator start time V
CC
= 3.0 V 1 s
C
g
XIN capacitance 12 pF
C
d
XOUT capacitance 12 pF
IC-to-IC frequency variation
(1)
1. 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
)
–10 +10 ppm
AI00589
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 11. AC characteristics
Symbol Parameter
(1)
1. Valid for ambient operating temperature: T
A
= –40 to 85 °C; V
CC
= 1.3 to 4.4 V (except where
noted).
Min Max Unit
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
Data setup time 100 ns
t
HD:DAT
(2)
2. Transmitter must internally provide a hold time to bridge the undefined region (300 ns max.) of
the falling edge of SCL.
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