UCD3138 datasheet(17/89 Pages) TI1

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UCD3138

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SLUSAP2G – MARCH 2012 – REVISED SEPTEMBER 2016

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Specifications

Table 5-1. PMBus/SMBus/I2C Timing (continued)

PARAMETER

TEST CONDITIONS

MIN

TYP MAX

UNIT

(3)

t(HIGH), Max, is the minimum bus idle time. SMBC = SMBD = 1 for t > 50 ms causes reset of any transaction that is in progress. This

specification is valid when the NC_SMB control bit remains in the default cleared state (CLK[0] = 0).

(4)

t(LOW:SEXT) is the cumulative time a slave device is allowed to extend the clock cycles in one message from initial start to the stop.

(5)

Cb (pF)

t(LOW)

Clock low period

1.3

µs

t(HIGH)

Clock high period(3)

0.6

µs

t(LOW:SEXT)

Cumulative clock low slave extend

time(4)

Clock/data fall time

Rise time tr = (VILmax – 0.15) to (VIHmin + 0.15)

20 + 0.1

Cb(5)

300

Clock/data rise time

Fall time tf = 0.9 VDD to (VILmax – 0.15)

20 + 0.1

Cb(5)

300

Total capacitance of one bus line

400

Figure 5-1. I2C/SMBus/PMBus Timing Diagram

Figure 5-2. Bus Timing in Extended Mode

5.7

Power Supply Sequencing

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