PIC16F818/819
TABLE 15-8: I2C™ BUS DATA REQUIREMENTS
Param.
Symbol
Characteristic
Min
Max Units
Conditions
No.
100*
THIGH
Clock High Time
100 kHz mode
4.0
0.6
—
—
µs
µs
400 kHz mode
SSP Module
100 kHz mode
400 kHz mode
SSP Module
1.5 TCY
4.7
—
101*
TLOW
Clock Low Time
—
µs
µs
1.3
—
1.5 TCY
—
—
102*
103*
TR
TF
SDA and SCL Rise 100 kHz mode
Time
1000
ns
ns
400 kHz mode
20 + 0.1 CB 300
CB is specified to be from
10-400 pF
SDA and SCL Fall 100 kHz mode
Time
—
300
ns
ns
400 kHz mode
20 + 0.1 CB 300
CB is specified to be from
10-400 pF
90*
TSU:STA
THD:STA
Start Condition
Setup Time
100 kHz mode
400 kHz mode
4.7
0.6
4.0
0.6
0
—
—
µs
µs
µs
µs
ns
µs
ns
ns
µs
µs
ns
ns
µs
µs
Only relevant for Repeated
Start condition
91*
Start Condition Hold 100 kHz mode
Time
—
After this period, the first
clock pulse is generated
400 kHz mode
—
106*
107*
92*
THD:DAT Data Input Hold
Time
100 kHz mode
400 kHz mode
100 kHz mode
400 kHz mode
100 kHz mode
400 kHz mode
100 kHz mode
400 kHz mode
100 kHz mode
400 kHz mode
—
0
0.9
—
TSU:DAT
TSU:STO
TAA
Data Input Setup
Time
250
100
4.7
0.6
—
(Note 2)
—
Stop Condition
Setup Time
—
—
109*
110*
Output Valid from
Clock
3500
—
(Note 1)
—
TBUF
Bus Free Time
4.7
1.3
—
Time the bus must be free
before a new transmission
can start
—
CB
Bus Capacitive Loading
—
400
pF
*
These parameters are characterized but not tested.
Note 1: As a transmitter, the device must provide this internal minimum delay time to bridge the undefined region
(min. 300 ns) of the falling edge of SCL to avoid unintended generation of Start or Stop conditions.
2: A Fast mode (400 kHz) I2C™ bus device can be used in a Standard mode (100 kHz) I2C bus system but
the requirement, TSU:DAT ≥ 250 ns, must then be met. This will automatically be the case if the device does
not stretch the LOW period of the SCL signal. If such a device does stretch the LOW period of the SCL
signal, it must output the next data bit to the SDA line, TR max. + TSU:DAT = 1000 + 250 = 1250 ns
(according to the Standard mode I2C bus specification), before the SCL line is released.
DS39598E-page 140
2004 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
