ZHCSO34F April 2011 – August 2021 DS80PCI402
PRODUCTION DATA
The 4-level input pins use a resistor divider to help set the four valid levels. There is an internal 30-kΩ pullup and a 60-kΩ pulldown connected to the package pin. These resistors, together with the external resistor connection combine to achieve the desired voltage level. Using the 1-kΩ pullup, 1-kΩ pulldown, no connect, or 20-kΩ pulldown provide the optimal voltage levels for each of the four input states.
| LEVEL | SETTING | 3.3-V MODE | 2.5-V MODE | |
|---|---|---|---|---|
| 0 | 1 kΩ to GND | 0.1 V | 0.08 V | |
| R | 20 kΩ to GND | 0.33 × VIN | 0.33 × VDD | |
| F | FLOAT | 0.67 × VIN | 0.67 × VDD | |
| 1 | 1 kΩ to VDD/VIN | VIN – 0.05 V | VDD – 0.04 V | |
Typical 4-level input thresholds:
To minimize the start-up current associated with the integrated 2.5-V regulator, the 1-kΩ pullup and pulldown resistors are recommended. If several 4-level inputs require the same setting, it is possible to combine two or more 1-kΩ resistors into a single lower value resistor. As an example; combining two inputs with a single 500-Ω resistor is a good way to save board space. For the 20 kΩ to GND, this should also scale to 10 kΩ.
| EQUALIZATION BOOST RELATIVE TO DC | |||||||
|---|---|---|---|---|---|---|---|
| LEVEL | EQA1 EQB1 |
EQA0 EQB0 |
EQ – 8 BITS [7:0] | dB at 1.25 GHz |
dB at 2.5 GHz |
dB at 4 GHz |
SUGGESTED USE |
| 1 | 0 | 0 | 0000 0000 = 0x00 | 2.1 | 3.7 | 4.9 | FR4 < 5 inch trace |
| 2 | 0 | R | 0000 0001 = 0x01 | 3.4 | 5.8 | 7.9 | FR4 5 inch 5–mil trace |
| 3 | 0 | Float | 0000 0010 = 0x02 | 4.8 | 7.7 | 9.9 | FR4 5 inch 4–mil trace |
| 4 | 0 | 1 | 0000 0011 = 0x03 | 5.9 | 8.9 | 11.0 | FR4 10 inch 5–mil trace |
| 5 | R | 0 | 0000 0111 = 0x07 | 7.2 | 11.2 | 14.3 | FR4 10 inch 4–mil trace |
| 6 | R | R | 0001 0101 = 0x15 | 6.1 | 11.4 | 14.6 | FR4 15 inch 4–mil trace |
| 7 | R | Float | 0000 1011 = 0x0B | 8.8 | 13.5 | 17.0 | FR4 20 inch 4–mil trace |
| 8 | R | 1 | 0000 1111 = 0x0F | 10.2 | 15.0 | 18.5 | FR4 25 to 30 inch 4–mil trace |
| 9 | Float | 0 | 0101 0101 = 0x55 | 7.5 | 12.8 | 18.0 | FR4 30 inch 4–mil trace |
| 10 | Float | R | 0001 1111 = 0x1F | 11.4 | 17.4 | 22.0 | FR4 35 inch 4–mil trace |
| 11 | Float | Float | 0010 1111 = 0x2F | 13.0 | 19.7 | 24.4 | 10 m, 30-awg cable |
| 12 | Float | 1 | 0011 1111 = 0x3F | 14.2 | 21.1 | 25.8 | 10 m – 12m cable |
| 13 | 1 | 0 | 1010 1010 = 0xAA | 13.8 | 21.7 | 27.4 | |
| 14 | 1 | R | 0111 1111 = 0x7F | 15.6 | 23.5 | 29.0 | |
| 15 | 1 | Float | 1011 1111 = 0xBF | 17.2 | 25.8 | 31.4 | |
| 16 | 1 | 1 | 1111 1111 = 0xFF | 18.4 | 27.3 | 32.7 | |
| LEVEL | DEMA1 DEMB1 |
DEMA0 DEMB0 |
VOD Vp-p | DEM dB (see (1)) |
INNER AMPLITUDE Vp-p |
SUGGESTED USE |
|---|---|---|---|---|---|---|
| 1 | 0 | 0 | 0.8 | 0 | 0.8 | FR4 < 5 inch 4-mil trace |
| 2 | 0 | R | 0.9 | 0 | 0.9 | FR4 < 5 inch 4-mil trace |
| 3 | 0 | Float | 0.9 | –3.5 | 0.6 | FR4 10 inch 4-mil trace |
| 4 | 0 | 1 | 1.0 | 0 | 1.0 | FR4 < 5 inch 4-mil trace |
| 5 | R | 0 | 1.0 | –3.5 | 0.7 | FR4 10 inch 4-mil trace |
| 6 | R | R | 1.0 | –6 | 0.5 | FR4 15 inch 4-mil trace |
| 7 | R | Float | 1.1 | 0 | 1.1 | FR4 < 5 inch 4-mil trace |
| 8 | R | 1 | 1.1 | –3.5 | 0.7 | FR4 10 inch 4-mil trace |
| 9 | Float | 0 | 1.1 | –6 | 0.6 | FR4 15 inch 4-mil trace |
| 10 | Float | R | 1.2 | 0 | 1.2 | FR4 < 5 inch 4-mil trace |
| 11 | Float | Float | 1.2 | –3.5 | 0.8 | FR4 10 inch 4-mil trace |
| 12 | Float | 1 | 1.2 | –6 | 0.6 | FR4 15 inch 4-mil trace |
| 13 | 1 | 0 | 1.3 | 0 | 1.3 | FR4 < 5 inch 4-mil trace |
| 14 | 1 | R | 1.3 | –3.5 | 0.9 | FR4 10 inch 4-mil trace |
| 15 | 1 | Float | 1.3 | –6 | 0.7 | FR4 15 inch 4-mil trace |
| 16 | 1 | 1 | 1.3 | –9 | 0.5 | FR4 20 inch 4-mil trace |
| PRSNT(1) (PIN 52) |
RXDET (PIN 22) |
SMBus REG BIT[3:2] |
INPUT TERMINATION | COMMENTS |
|---|---|---|---|---|
| 0 | 0 | 00 | Hi-Z | Manual RX-Detect, input is high-impedance mode |
| 0 | Tie 20 kΩ to GND |
01 | Pre Detect: Hi-Z Post Detect: 50 Ω |
Auto RX-Detect, outputs test every 12 ms for 600 ms then stops;
termination is hi-Z until detection; once detected input termination
is 50 Ω Reset function by pulsing PRSNT high for 5 μs then low again |
| 0 | Float (Default) |
10 | Pre Detect: Hi-Z Post Detect: 50 Ω |
Auto RX-Detect, outputs test every 12 ms until detection occurs;
termination is hi-Z until detection; once detected input termination
is 50 Ω Reset function by pulsing PRSNT high for 5 μs then low again |
| 0 | 1 | 11 | 50 Ω | Manual RX-Detect, input is 50 Ω |
| 1 | X | Hi-Z | Power-down mode, input is high impedance, output drivers are
disabled Used to reset RX-Detect State Machine when held high for 5 μs |
| SD_TH | SMBus REG BIT [3:2] AND [1:0] | ASSERT LEVEL (TYP) | DEASSERT LEVEL (TYP) |
|---|---|---|---|
| 0 | 10 | 210 mVp-p | 150 mVp-p |
| R | 01 | 160 mVp-p | 100 mVp-p |
| F (default) | 00 | 180 mVp-p | 110 mVp-p |
| 1 | 11 | 190 mVp-p | 130 mVp-p |