ADT7421

http://onsemi.com

3

MAXIMUM RATINGS

Parameter

Rating

−0.3 V, +3.6 V

D+

D− to GND

−0.3 V to +0.6 V

SCL, SDA, ALERT, THERM

Input Current, SDA, THERM2

−1 mA, +50 mA

Input Current, D−

−1 mA

ESD Rating, All Pins (Human Body Model)

1500 V

ESD Rating, All Pins (Machine Model)

100 V

150°C

Storage Temperature Range

−65°C to +150°C

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the

Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect

device reliability.

NOTE: This device is ESD sensitive. Use standard ESD precautions when handling.

THERMAL RESISTANCE

Package Type

Unit

8−Lead MSOP

142

43.74

°C/W

SMBus Timing Specifications

Parameter (Note 1)

Unit

Description

400

kHz max

1.3

ms min

Clock low period, between 10% points

0.6

ms min

Clock high period, between 90% points

300

ns max

Clock/data rise time

300

ns max

Clock/data fall time

600

ns min

Start condition setup time

600

ns min

Start condition hold time

100

ns min

Data setup time

600

ns min

Stop condition setup time

1.3

ms min

Bus free time between stop and start conditions

1. Guaranteed by design, but not production tested.

2. Time from 10% of SDATA to 90% of SCLK.

3. Time for 10% or 90% of SDATA to 10% of SCLK.

4. Time for 90% of SCLK to 10% of SDATA.

Figure 2. Serial Bus Timing

SCLK

SDATA

STOP START

STOP

START