LPC47S457-NC SMSC [SMSC Corporation], LPC47S457-NC Datasheet - Page 246

• Manufacturer Part Number: LPC47S457-NC
• Description: Advanced I/O with X-Bus Interface
• Manufacturer: SMSC [SMSC Corporation]

11.8 SMBUS Timing
Note 1: A device will timeout when any clock low exceeds this value.
Note 2: T
SMSC LPC47S45x
SCLK
SDAT
F
T
T
T
T
T
T
T
T
T
T
T
T
T
SMB
BUF
SU
SU
SU
HD
HD
TIMEOUT
LOW
HIGH
LOW
LOW
F
R
HIGH
P
SYMBOL
:
:
:
:
:
STA
STO
DAT
STA
DAT
:
:
t
SEXT
MEXT
BUF
Max provides a simple guaranteed method for devices to detect bus idle conditions.
S
SMB Operating Frequency
Bus free time between Stop and
Start Condition
Hold time after (Repeated) Start
Condition. After this period, the first
clock is generated.
Repeated Start Condition setup time
Stop Condition setup time
Data hold time
Data setup time
Max. Clock low time
Clock low period
Clock high period
Cumulative clock low extend time
(slave device)
Cumulative clock low extend time
(master device)
Clock/Data Fall Time
Clock/Data Rise Time
t
HD;STA
t
LOW
t
HD;DAT
PARAMETER
t
R
FIGURE 37 − SMBUS TIMING
DATASHEET
t
HIGH
Page 246 of 259
t
SU;DAT
t
F
t
SU;STA
MIN
250
4.7
4.0
4.7
4.0
4.7
4.0
10
25
0
LIMITS
S
MAX
1000
100
300
35
50
25
10
t
HD;STA
kHz
μ s
μ s
μ s
μ s
ns
ns
ms
μ s
μ s
ms
ms
ns
ns
UNITS
see note 1
see note 2
COMMENTS
t
SU;STO
Rev. 06-01-06
P