SMM465
Preliminary Information
I
2
C 2-WIRE SERIAL INTERFACE AC OPERATING CHARACTERISTICS – 100/400kHz
Over recommended operating conditions, unless otherwise noted. All voltages are relative to GND.
See Figure 4 Timing Diagram.
Conditions
100kHz
400kHz
Symbol Description
Min Typ
Max
Min Typ
Max
f
SCL
t
LOW
t
HIGH
t
BUF
t
SU:STA
t
HD:STA
t
SU:STO
t
AA
t
DH
t
R
t
F
t
SU:DAT
t
HD:DAT
TI
t
WR_CONFIG
t
WR_EE
SCL Clock Frequency
Clock Low Period
Clock High Period
Bus Free Time
Start Condition Setup
Time
Start Condition Hold Time
Stop Condition Setup Time
Clock Edge to Data Valid
Data Output Hold Time
SCL and SDA Rise Time
SCL and SDA Fall Time
Data In Setup Time
Data In Hold Time
Noise Filter SCL and SDA
Write Cycle Time Config
Write Cycle Time EE
Noise suppression
Configuration
Registers
Memory Array
SCL low to valid
SDA (cycle n)
SCL low (cycle n+1)
to SDA change
Note
1/
Note
1/
Before New Transmission
-
Note
1/
Units
KHz
µs
µs
µs
µs
µs
µs
0
4.7
4.0
4.7
4.7
4.0
4.7
0.2
0.2
100
0
1.3
0.6
1.3
0.6
0.6
0.6
400
3.5
0.2
0.2
0.9
µs
µs
1000
300
250
0
100
10
5
150
0
100
1000
300
ns
ns
ns
ns
ns
10
5
ms
ms
Note: 1/ - Guaranteed by Design.
TIMING DIAGRAMS
t
W R (For W rite O peration Only)
t
LOW
t
SU:DAT
t
SU:STO
t
BUF
t
R
SCL
t
SU:SDA
SDA
(IN)
t
F
t
HD:SDA
t
HIGH
t
HD:DAT
t
AA
SDA
(OUT)
t
DH
Figure 4 - Basic I
2
C Serial Interface Timing
Summit Microelectronics, Inc
2085 1.1 05/27/04
11
SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
