MCP453X/455X/463X/465X
103
102
100
101
SCL
90
106
91
92
107
SDA
In
110
109
109
SDA
Out
2
FIGURE 1-2:
I C Bus Data Timing.
2
TABLE 1-2:
I C BUS DATA REQUIREMENTS (SLAVE MODE)
I2C AC Characteristics
Standard Operating Conditions (unless otherwise specified)
Operating Temperature –40°C ≤ TA ≤ +125°C (Extended)
Operating Voltage VDD range is described in AC/DC characteristics
Param.
No.
Sym
Characteristic
Min
Max Units
Conditions
Clockhightime 100 kHz mode
400 kHz mode
4000
600
120
60
—
—
ns
ns
ns
ns
ns
ns
ns
ns
1.8V-5.5V
100
THIGH
2.7V-5.5V
4.5V-5.5V
4.5V-5.5V
1.8V-5.5V
2.7V-5.5V
4.5V-5.5V
4.5V-5.5V
1.7 MHz mode
3.4 MHz mode
—
—
—
101
TLOW
Clock low time 100 kHz mode
400 kHz mode
4700
1300
320
160
1.7 MHz mode
3.4 MHz mode
—
Note 1: As a transmitter, the device must provide this internal minimum delay time to bridge the undefined region
(minimum 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.
3: The MCP46X1/MCP46X2 device must provide a data hold time to bridge the undefined part between VIH
and VIL of the falling edge of the SCL signal. This specification is not a part of the I2C specification, but
must be tested in order to ensure that the output data will meet the setup and hold specifications for the
receiving device.
4: Use Cb in pF for the calculations.
5: Not Tested
6: A Master Transmitter must provide a delay to ensure that difference between SDA and SCL fall times do
not unintentionally create a Start or Stop condition.
7: Ensured by the TAA 3.4 MHz specification test.
DS22096A-page 14
© 2008 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
