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FUSB302

• Rev. 2

13

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DC and Transient Characteristics

Baseband PD

Symbol

Parameter

Unit

Min.

Typ. Max.

UI

Unit Interval

3.03

3.70

µs

Transmitter

rOutput

TX Output Resistance

21

50

79

Ω

Time to Cease Driving the Line after the end of the last bit of the

Frame

23

µs

Time to Cease Driving the Line after the final High-to-Low

Transition

1

µs

Logic High Voltage

1.05

1.20

V

Logic Low Voltage

0

75

mV

Time before the start of the first bit of the preamble when the

transmitter shall start driving the line

-1

1

µs

Rise Time

300

ns

Fall Time

300

ns

Receiver

cReceiver

Receiver Capacitance when Driver

isn’t Turned On

50

pF

zBmcRx

Receiver Input Impedance

1

M

Ω

vSDACstep

BMC Receiver SDAC step size for each code in SDAC[5:0]

register

17

mV

vSDAChys

BMC Receiver SDAC hysteresis for each code over the SDAC

range (SDAC_HYS=01)

85

mV

tRxFilter

Rx Bandwidth Limiting Filter(5)

100

ns

nTransitionCount Transitions count in time window of 12 µs Min. and 20 µs Max. (5)

3

edges

tACTIVITY

Time from the last BMC edge(4) to when ACTIVITY bit goes LOW

in the STATUS register(5)

5

9

µs

Notes:

4.

The last BMC edge includes edge when BMC bus is not driven and thus voltage is the result of pull ups/pull

downs to if/when it trips the SDAC receiver threshold to cause another BMC edge.

5.

Guaranteed by characterization. Not production tested

Figure 15.

Transmitter Test Load