component
DS125BR111RTWT
Public Made by Adomby adom
Texas Instruments Signal Buffers, Repeaters, Splitters, WQFN-24(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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"title": "DS125BR111RTWT",
"brief": "Texas Instruments Signal Buffers, Repeaters, Splitters, WQFN-24(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
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"mpn": "DS125BR111RTWT",
"manufacturer": "Texas Instruments",
"package": "WQFN-24(4x4)",
"pin_count": 25,
"category": "Communication Interface Chip/UART/485/232",
"subcategory": "Signal Buffers, Repeaters, Splitters",
"datasheet": "https://www.ti.com/cn/lit/gpn/ds125br111",
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{
"number": "1",
"name": "AD3/EQB0",
"type": "input",
"description": "In pin mode this 4-level input sets the channel B equalization level (EQB0), and in SMBus mode it is SMBus slave address input AD3; EQB0 is defined only when ENSMB is low."
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{
"number": "2",
"name": "AD2/EQB1",
"type": "input",
"description": "In pin mode this input is EQB1, which the datasheet states is not used in this design and should be tied to GND; in SMBus mode it is SMBus slave address input AD2."
},
{
"number": "3",
"name": "ENSMB",
"type": "input",
"description": "4-level input that selects SMBus register access when tied 1 kΩ to VDD, read of external EEPROM when floating, and pin mode when tied 1 kΩ to GND."
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{
"number": "4",
"name": "SDA/VODA_DB",
"type": "bidirectional",
"description": "SMBus bidirectional open-drain data pin requiring external pull-up of typically 2 kΩ to 5 kΩ and 3.3 V tolerance in SMBus mode; in pin mode it is VODA_DB, which should be held Low for SAS and PCIe applications."
},
{
"number": "5",
"name": "SCL/VODB_DB",
"type": "bidirectional",
"description": "SMBus clock input (slave mode) or open-drain clock output while loading EEPROM (master mode); in pin mode it is VODB_DB, which should be held Low for SAS and PCIe applications."
},
{
"number": "6",
"name": "PWDN",
"type": "input",
"description": "LVCMOS power-down input where tying High selects low power/power down and tying GND selects normal operation."
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{
"number": "7",
"name": "OUTA+",
"type": "output",
"description": "Non-inverting 50 Ω CML driver output for channel A, compatible with AC-coupled CML inputs and requiring AC coupling."
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{
"number": "8",
"name": "OUTA-",
"type": "output",
"description": "Inverting 50 Ω CML driver output for channel A, compatible with AC-coupled CML inputs and requiring AC coupling."
},
{
"number": "9",
"name": "AD1/EQA1",
"type": "input",
"description": "In pin mode this input is EQA1, which the datasheet states is not used in this design and should be tied to GND; in SMBus mode it is SMBus slave address input AD1."
},
{
"number": "10",
"name": "AD0/EQA0",
"type": "input",
"description": "In pin mode this 4-level input sets the channel A equalization level (EQA0), and in SMBus mode it is SMBus slave address input AD0; EQA0 is defined only when ENSMB is low."
},
{
"number": "11",
"name": "INB+",
"type": "input",
"description": "Non-inverting CML differential input to the equalizer with an on-chip 50 Ω termination to VDD when enabled by RXDET logic; AC coupling is required."
},
{
"number": "12",
"name": "INB-",
"type": "input",
"description": "Inverting CML differential input to the equalizer with an on-chip 50 Ω termination to VDD when enabled by RXDET logic; AC coupling is required."
},
{
"number": "13",
"name": "RES",
"type": "unconnected",
"description": "Reserved pin that the datasheet states must be left floating."
},
{
"number": "14",
"name": "SD_TH",
"type": "input",
"description": "4-level input setting the internal signal detect threshold for system debug only, which does not control the high-speed datapath."
},
{
"number": "15",
"name": "VIN",
"type": "power_in",
"description": "Supply input that must be fed 3.3 V in 3.3 V mode and left floating in 2.5 V mode."
},
{
"number": "16",
"name": "VDD_SEL",
"type": "input",
"description": "Internal regulator control: float selects 2.5 V mode, tie to GND selects 3.3 V mode (enables internal regulator)."
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{
"number": "17",
"name": "READEN/VOD_SEL",
"type": "input",
"description": "In SMBus slave mode this pin must be tied Low for AD[3:0] to be active (High or float gives address 0xB0); in pin mode it is VOD_SEL, a 4-level input controlling the low-frequency input-to-output voltage amplitude ratio."
},
{
"number": "18",
"name": "DONE/RXDET",
"type": "bidirectional",
"description": "DONE is a valid register load status output (High means EEPROM load failed or incomplete, Low means passed) when ENSMB floats; RXDET in pin mode enables a 50 Ω or >50 kΩ termination to the power rail depending on input level."
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{
"number": "19",
"name": "OUTB-",
"type": "output",
"description": "Inverting 50 Ω CML driver output for channel B, compatible with AC-coupled CML inputs and requiring AC coupling."
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{
"number": "20",
"name": "OUTB+",
"type": "output",
"description": "Non-inverting 50 Ω CML driver output for channel B, compatible with AC-coupled CML inputs and requiring AC coupling."
},
{
"number": "21",
"name": "VDD",
"type": "power_in",
"description": "Supply pin for CML/analog circuitry; connect to 2.5 V in 2.5 V mode and decouple to GND with 0.22 µF capacitance in 3.3 V mode."
},
{
"number": "22",
"name": "VDD",
"type": "power_in",
"description": "Supply pin for CML/analog circuitry; connect to 2.5 V in 2.5 V mode and decouple to GND with 0.22 µF capacitance in 3.3 V mode."
},
{
"number": "23",
"name": "INA-",
"type": "input",
"description": "Inverting CML differential input to the equalizer with an on-chip 50 Ω termination to VDD when enabled by RXDET logic; AC coupling is required."
},
{
"number": "24",
"name": "INA+",
"type": "input",
"description": "Non-inverting CML differential input to the equalizer with an on-chip 50 Ω termination to VDD when enabled by RXDET logic; AC coupling is required."
},
{
"number": "25",
"name": "EP",
"type": "passive",
"description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
}
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"guards": "pin_guards 0.1: passed",
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],
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"at": "2026-10-28T15:58:38"
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"metadata": {
"specs": {
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"Package": "WQFN-24(4x4)",
"Category": "Communication Interface Chip/UART/485/232",
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"characteristics": {
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"name": "Supply Voltage (VDD - 2.5 V)",
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"unit": "V",
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"max": 2.75,
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"min": -0.5,
"typ": null,
"max": 4,
"conditions": "",
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{
"name": "LVCMOS Input/Output Voltage",
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"min": -0.5,
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{
"name": "CML Input Current",
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{
"name": "Storage temperature range",
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"unit": "°C",
"min": -40,
"typ": null,
"max": 125,
"conditions": "",
"source_page": 6,
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{
"name": "Lead Temperature Range Soldering",
"symbol": "Tsolder",
"kind": "absolute_maximum",
"unit": "°C",
"min": null,
"typ": null,
"max": 260,
"conditions": "4 sec.",
"source_page": 6,
"source": "datasheet"
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{
"name": "Electrostatic discharge, human body model",
"symbol": "V(ESD)",
"kind": "absolute_maximum",
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"min": -5000,
"typ": null,
"max": 5000,
"conditions": "HBM, all pins",
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{
"name": "Electrostatic discharge, charged device model",
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"min": -1250,
"typ": null,
"max": 1250,
"conditions": "CDM, all pins",
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{
"name": "Supply Voltage (2.5 V mode)",
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"kind": "recommended_operating",
"unit": "V",
"min": 2.375,
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"max": 2.625,
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{
"name": "Supply Voltage (3.3 V mode)",
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"unit": "V",
"min": 3,
"typ": 3.3,
"max": 3.6,
"conditions": "",
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{
"name": "Ambient Temperature",
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"kind": "recommended_operating",
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"min": -40,
"typ": 25,
"max": 85,
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{
"name": "Supply Noise up to 50 MHz",
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"conditions": "allowed supply noise, typical conditions",
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{
"name": "Current Consumption",
"symbol": "IDD",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 40,
"max": 60,
"conditions": "VODx_DB = 0, EQ = 0, VOD_SEL = 1, RXDET = 1, PWDN = 0, VIN = 2.625 or 3.6 V",
"source_page": 7,
"source": "datasheet"
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{
"name": "Power Down Current Consumption",
"symbol": "",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 7,
"max": 13,
"conditions": "PWDN = 1",
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{
"name": "Integrated LDO Regulator VDD",
"symbol": "VDD",
"kind": "electrical",
"unit": "V",
"min": 2.375,
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"conditions": "VIN = 3.0 - 3.6 V",
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{
"name": "High Level Input Voltage, 2.5 V Supply Mode",
"symbol": "Vih25",
"kind": "electrical",
"unit": "V",
"min": 1.7,
"typ": null,
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"conditions": "2.5 V Supply Mode; max printed as VDD",
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{
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"min": 0,
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"max": 0.7,
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{
"name": "High Level Output Voltage (DONE pin)",
"symbol": "Voh",
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"min": 2,
"typ": null,
"max": null,
"conditions": "Ioh = −4 mA",
"source_page": 7,
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{
"name": "Low Level Output Voltage (DONE pin)",
"symbol": "Vol",
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"typ": null,
"max": 0.4,
"conditions": "Iol = 4 mA",
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{
"name": "Input High Current (PWDN pin)",
"symbol": "Iih",
"kind": "electrical",
"unit": "µA",
"min": -15,
"typ": null,
"max": 15,
"conditions": "VIN = 3.6 V, LVCMOS = 3.6 V",
"source_page": 7,
"source": "datasheet"
},
{
"name": "Input Low Current (PWDN pin)",
"symbol": "Iil",
"kind": "electrical",
"unit": "µA",
"min": -15,
"typ": null,
"max": 15,
"conditions": "VIN = 3.6 V, LVCMOS = 0 V",
"source_page": 7,
"source": "datasheet"
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{
"name": "Input High Current with internal resistors (4-level input pin)",
"symbol": "Iih",
"kind": "electrical",
"unit": "µA",
"min": 20,
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"conditions": "VIN = 3.6 V, LVCMOS = 3.6 V",
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{
"name": "Input Low Current with internal resistors (4-level input pin)",
"symbol": "Iil",
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"unit": "µA",
"min": -160,
"typ": null,
"max": -40,
"conditions": "VIN = 3.6 V, LVCMOS = 0 V",
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},
{
"name": "RX Differential return loss SDD11 10 MHz",
"symbol": "RLRX-diff",
"kind": "electrical",
"unit": "dB",
"min": null,
"typ": null,
"max": -19,
"conditions": "SDD11 10 MHz",
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},
{
"name": "RX Differential return loss SDD11 2 GHz",
"symbol": "RLRX-diff",
"kind": "electrical",
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"min": null,
"typ": null,
"max": -14,
"conditions": "SDD11 2 GHz",
"source_page": 7,
"source": "datasheet"
},
{
"name": "RX Differential return loss SDD11 6-11.1 GHz",
"symbol": "RLRX-diff",
"kind": "electrical",
"unit": "dB",
"min": null,
"typ": null,
"max": -8,
"conditions": "SDD11 6-11.1 GHz",
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{
"name": "RX Common mode return loss",
"symbol": "RLRX-cm",
"kind": "electrical",
"unit": "dB",
"min": null,
"typ": null,
"max": -10,
"conditions": "0.05 - 5 GHz",
"source_page": 7,
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},
{
"name": "RX DC common mode impedance",
"symbol": "ZRX-dc",
"kind": "electrical",
"unit": "Ω",
"min": 40,
"typ": 50,
"max": 60,
"conditions": "Tested at VDD = 2.5 V",
"source_page": 7,
"source": "datasheet"
},
{
"name": "RX DC differential mode impedance",
"symbol": "ZRX-diff-dc",
"kind": "electrical",
"unit": "Ω",
"min": 80,
"typ": 100,
"max": 120,
"conditions": "Tested at VDD = 2.5 V",
"source_page": 7,
"source": "datasheet"
},
{
"name": "Transmitter rise/fall time",
"symbol": "TTX-RISE-FALL",
"kind": "timing",
"unit": "ps",
"min": null,
"typ": 40,
"max": null,
"conditions": "20% to 80% of differential output voltage",
"source_page": 7,
"source": "datasheet"
},
{
"name": "Transmitter rise/fall mismatch",
"symbol": "TRF-MISMATCH",
"kind": "timing",
"unit": "UI",
"min": null,
"typ": 0.01,
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