ISL54103IHZ-T7A Datasheet, PDF (7/8 Pages) Intersil Corporation – More Reliable HDCP Performance In Video Multiplexers and Cable Extenders

ISL54103
When the bus line is released, it is pulled high by the
ISL54103 active current until the voltage exceeds the
V_TRIPL level for a period of time. This voltage-time
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
current turns off when the input level reaches the V_TRIPH
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.
V_TRIPH
With ISL54103 DDCA
V_TRIPH
With ISL54103 DDCA
V_TRIPL
With RC
Pull-up
R = 15.8k
C = 200pF
V_TRIPL
R = 15.8k
C = 200pF
With RC
Pull-up
FIGURE 8. ISL54103 DDC SYSTEM BOOST PULL-UP
COMPARED TO RESISTOR PULL-UP
(V_DD = 5.5V)
FIGURE 9. ISL54103 DDC SYSTEM BOOST PULL-UP
COMPARED TO RESISTOR PULL-UP
(V_DD = 2.7V)
V_DD
V_TRIPH
With DDCA
Without DDCA
V_TRIPL
Gnd
>20Vns
(Typical)
DDC1
t
DDC2
FIGURE 10. NOISE SUPPRESSION. BOOST CURRENT
APPLIED WHEN INPUT SIGNAL EXCEEDS 20Vns
(TYPICAL)
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FN6303.2
October 14, 2011