M4T28-BR12SH ST Microelectronics, M4T28-BR12SH Datasheet - Page 12

• Manufacturer Part Number: M4T28-BR12SH
• Description: TIMEKEEPER SNAPHAT Battery & Crystal
• Manufacturer: ST Microelectronics

M41ST85Y, M41ST85W
Figure 11. WRITE Cycle Timing: RTC & External SRAM Control Signals
Figure 12. Bus Timing Requirements Sequence
Table 6. AC Characteristics
Note: 1. Valid for Ambient Operating Temperature: T
12/33
t
Symbol
HD:DAT
t
t
t
t
SU:STO
2. Transmitter must internally provide a hold time to bridge the undefined region (300ns max) of the falling edge of SCL.
HD:STA
SU:DAT
SU:STA
t
t
t
f
t
EXPD
HIGH
LOW
SCL
BUF
t
t
R
F
SDA
SCL
(2)
EX
E CON
tBUF
SCL Clock Frequency
Time the bus must be free before a new transmission can start
EX to E
SDA and SCL Fall Time
Data Hold Time
START Condition Hold Time
(after this period the first clock pulse is generated)
Clock High Period
Clock Low Period
SDA and SCL Rise Time
Data Setup Time
START Condition Setup Time
(only relevant for a repeated start condition)
STOP Condition Setup Time
P
CON
Propagation Delay
S
tEXPD
tHD:STA
tR
Parameter
A
tLOW
tHIGH
= –40 to 85°C; V
tF
(1)
tHD:DAT
CC
tEXPD
= 4.5 to 5.5V or 2.7 to 3.6V (except where noted).
tSU:DAT
M41ST85W
M41ST85Y
SR
tSU:STA
Min
600
600
100
600
600
1.3
1.3
0
0
tHD:STA
Max
P
AI00589
400
300
300
10
15
AI03663
tSU:STO
Unit
kHz
µs
ns
ns
µs
ns
ns
µs
ns
ns
ns
ns