HDMI2C1-14HD Datasheet, PDF (18/32 Pages) STMicroelectronics – HPD pull down and signal conditioning

Electrical characteristics
HDMI2C1-14HD
1. In order to activate the DDC functional block, the 3 following conditions have to be met:
- V_{DD_5V} has to reach the V_{DD_5V_ON} threshold
- The inputs and outputs of the bidirectional level shifter must be set to a high level after the power-on
- The HPD line has to be activated one time
Table 5. CEC electrical characteristics⁽¹⁾
Symbol
Parameter
Test conditions Min. Typ. Max.
V_{Tup_CEC} Upward input voltage threshold on bus side
2.0
V_{Tdown_CEC} Downward input voltage threshold on bus side
0.8
V_{HYST_CEC} Input hysteresis on bus side
0.4
T_{RISE_CEC} Output rise-time (10% to 90%)
T_{FALL_CEC} Output fall-time (90% to 10%)
RUP_CEC = 14.1 k⁽²⁾
250
C_{CEC_CABLE} = 7.9 nF⁽²⁾
50
V_{DD_5V} = 0 V
I_{OFF_CEC} Leakage current in powered-off state
V_{DD_IC} = 0 V,
1.8
V_{DD_CEC} = 3.3 V
V_{IL_CEC_IC} Input low level on IC side
0.5
V_{IH_CEC_IC = 1.8 V}
1.5
V_{IH_CEC_IC} Input high level on IC side
V_{IH_CEC_IC = 3.3 V}
1.9
R_{ON_CEC} On resistance across CEC and CEC_IC pins CEC pin to 0 V
100
C_{IN_CEC} Input capacitance on CEC link
V_{DD_5V} = 0 V
V_{DD_CEC} = 0 V
V_{DD_IC} = 0 V
V_BIAS = 0 V, f = 1 MHz,
V_OSC = 30 mV
25⁽³⁾
1. T_amb = 25 °C, V_{DD_CEC} = 3.3 V, V_{DD_CEC_IC} = 1.8 V, unless otherwise specified
2. Test conditions are compliant with worst case CEC specification:
- Correspond to two 27 k +5% pull-up resistances in parallel (compliant with HDMI CTS)
- Max capacitance corresponding to 9 equipment chained on the CEC bus
3. Maximum capacitance allowed at connector output is 200 pF in HDMI 1.4 specification
Unit
V
V
V
µs
µs
µA
V
V

pF
Table 6. 5V_out current limiter electrical characteristics⁽¹⁾
Symbol
Parameter
Test conditions
Value
Unit
Min. Typ. Max.
V_DROP
I_{5V_OUT}
Drop-out voltage
Output current⁽³⁾
I_{5V_OUT} = 55 mA
V_{5V_OUT} = 0 V
20
50
95⁽²⁾
mV
55
115
mA
V_{L_FAULT} Low level on FAULT pin
R_{PU_FAULT} = 10 k
0.3
V
1. T_amb = 25°C, V_{DD_5V} = 5 V, unless otherwise specified
2. HDMI 1.4 specification requires a maximum of 100 mV voltage-drop
3. HDMI 1.4 standard specifies a minimal current capability of 55 mA, and an over-current protection of no more than 500 mA
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