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FN6303.2

October 14, 2011

When the bus line is released, it is pulled high by the

ISL54103 active current until the voltage exceeds the

combination filters out noise on the signal line. Once the

ISL54103 detects a valid rising edge, a 2.2mA boost current

pulls the bus line high very quickly (see Figure 8). This boost

threshold and the pull-up current returns to the active level. If

both inputs are HIGH, the pull-up current drops to the

standby level of 100µA.

FIGURE 8. ISL54103 DDC SYSTEM BOOST PULL-UP

COMPARED TO RESISTOR PULL-UP

FIGURE 9. ISL54103 DDC SYSTEM BOOST PULL-UP

COMPARED TO RESISTOR PULL-UP

FIGURE 10. NOISE SUPPRESSION. BOOST CURRENT

APPLIED WHEN INPUT SIGNAL EXCEEDS 20Vns

(TYPICAL)

With RC

Pull-up

With ISL54103 DDCA

R = 15.8k

C = 200pF

With RC

Pull-up

With ISL54103 DDCA

R = 15.8k

C = 200pF

Gnd

t

DDC1

>20Vns

DDC2

With DDCA

Without DDCA

(Typical)

ISL54103