component
SI5340B-D-GM
Public Made by Adomby adom
Skyworks Solutions Clock Generators / Frequency Synthesizers / PLL, QFN-44(7x7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
"schema_version": 1,
"type": "component",
"slug": "si5340b-d-gm",
"title": "SI5340B-D-GM",
"brief": "Skyworks Solutions Clock Generators / Frequency Synthesizers / PLL, QFN-44(7x7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"version": "0.1.0",
"license": "CC-BY-SA-4.0",
"tags": [
"component",
"rtc-clock chip",
"si5340b-d-gm",
"factory-2.0.0",
"extractor-text"
],
"component": {
"mpn": "SI5340B-D-GM",
"manufacturer": "Skyworks Solutions",
"package": "QFN-44(7x7)",
"pin_count": 45,
"category": "RTC/Clock Chip",
"subcategory": "Clock Generators / Frequency Synthesizers / PLL",
"datasheet": "https://datasheet.lcsc.com/datasheet/pdf/ca70372027a39ec31fca5e051b591a4a.pdf",
"parts": {
"symbol": "si5340b-d-gm.kicad_sym",
"footprint": "si5340b-d-gm.kicad_mod",
"model_3d": "si5340b-d-gm-hero.glb",
"model_3d_plain": "si5340b-d-gm-etched.glb",
"model_3d_step": "si5340b-d-gm-etched.step",
"model_3d_step_plain": "si5340b-d-gm.step",
"lbr": "si5340b-d-gm.lbr"
},
"distributor_links": {
"lcsc": "C3607873",
"digikey": "SI5340B-D-GM-ND",
"mouser": "634-SI5340B-D-GM"
},
"distributor_check": {
"checked_at": "2026-10-30T17:30:43Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "SI5340B-D-GM-ND",
"status": "found",
"lifecycle": "Active"
},
"mouser": {
"pn": "634-SI5340B-D-GM",
"status": "found"
}
},
"pins": [
{
"number": "1",
"name": "IN1",
"type": "input",
"description": "Clock input that accepts differential or single-ended clock signals; it is high-impedance and must be terminated externally."
},
{
"number": "2",
"name": "IN1b",
"type": "input",
"description": "Complementary half of the IN1 clock input pair, accepting differential or single-ended clocks; it is high-impedance and must be terminated externally."
},
{
"number": "3",
"name": "IN_SEL0",
"type": "input",
"description": "Input reference select bit 0 used in manual pin-controlled mode to choose the active clock input; internally pulled up with a ~20 kΩ resistor to the IO_VDD_SEL voltage and can be left unconnected."
},
{
"number": "4",
"name": "X1",
"type": "passive",
"description": "XTAL shield pin that must be connected directly to the XTAL ground pins, must not be tied to the PCB ground plane, and should be left disconnected when XA/XB is driven by an external reference clock."
},
{
"number": "5",
"name": "XA",
"type": "input",
"description": "Crystal or external clock input, selected when IN_SEL[1:0] = 11b; if unused and powered down it can be left unconnected."
},
{
"number": "6",
"name": "XB",
"type": "input",
"description": "Complementary crystal or external clock input for XA, used under the same conditions and may be left unconnected if unused and powered down."
},
{
"number": "7",
"name": "X2",
"type": "passive",
"description": "XTAL shield pin with the same requirements as X1: connect directly to the XTAL ground pins, keep off the PCB ground plane, and leave disconnected when using an external reference clock."
},
{
"number": "8",
"name": "VDDA",
"type": "power_in",
"description": "Core supply voltage of 3.3 V that requires a 3.3 V power source, with a 1.0 µF bypass capacitor recommended."
},
{
"number": "9",
"name": "VDDA",
"type": "power_in",
"description": "Core supply voltage of 3.3 V that requires a 3.3 V power source, with a 1.0 µF bypass capacitor recommended."
},
{
"number": "10",
"name": "IN2",
"type": "input",
"description": "Clock input that accepts differential or single-ended clock signals; it is high-impedance and must be terminated externally."
},
{
"number": "11",
"name": "IN2b",
"type": "input",
"description": "Complementary half of the IN2 clock input pair, accepting differential or single-ended clocks; it is high-impedance and must be terminated externally."
},
{
"number": "12",
"name": "OEb",
"type": "input",
"description": "Output enable that disables all outputs when held high; it is internally pulled low and can be left unconnected when not in use."
},
{
"number": "13",
"name": "SDA/SDIO",
"type": "bidirectional",
"description": "Serial data pin: SDA in I2C mode (requires an external pull-up of at least 1 kΩ), bidirectional SDIO in 3-wire SPI, or SDI in 4-wire SPI; no pull-up is needed in SPI mode."
},
{
"number": "14",
"name": "SCLK",
"type": "input",
"description": "Serial clock input for I2C and SPI modes, internally pulled up with ~20 kΩ to the IO_VDD_SEL voltage, and requiring an external pull-up of at least 1 kΩ in I2C mode."
},
{
"number": "15",
"name": "A1/SDO",
"type": "bidirectional",
"description": "Address select A1 in I2C mode (no internal pull-up or pull-down) or serial data output SDO in 4-wire SPI mode, driving high to the IO_VDD_SEL-selected voltage."
},
{
"number": "16",
"name": "A0/CSb",
"type": "input",
"description": "Hardware address A0 in I2C mode or active-low chip select in SPI mode, internally pulled up with ~20 kΩ to the IO_VDD_SEL-selected voltage."
},
{
"number": "17",
"name": "RSTb",
"type": "input",
"description": "Active-low device reset that performs power-on reset and forces registers to defaults; clock outputs are disabled during reset and the pin is internally pulled up with ~20 kΩ."
},
{
"number": "18",
"name": "VDDO0",
"type": "power_in",
"description": "Output clock supply for OUT0 driver at 3.3 V, 2.5 V or 1.8 V; leave unconnected if the output driver is unused."
},
{
"number": "19",
"name": "OUT0b",
"type": "output",
"description": "Complementary output clock 0 with register-configurable output format; termination per 3.5.2 and 3.5.4, and left unconnected if unused."
},
{
"number": "20",
"name": "OUT0",
"type": "output",
"description": "Output clock 0 with programmable signal amplitude when configured as differential, format set by register control; left unconnected if unused."
},
{
"number": "21",
"name": "VDD",
"type": "power_in",
"description": "Core supply voltage of 1.8 V, with a 1.0 µF bypass capacitor recommended."
},
{
"number": "22",
"name": "NC",
"type": "unconnected",
"description": "No connect pin not connected to the die; leave disconnected."
},
{
"number": "23",
"name": "VDDO1",
"type": "power_in",
"description": "Output clock supply for OUT1 driver at 3.3 V, 2.5 V or 1.8 V; leave unconnected if the output driver is unused."
},
{
"number": "24",
"name": "OUT1b",
"type": "output",
"description": "Complementary output clock 1 with register-configurable output format; left unconnected if unused."
},
{
"number": "25",
"name": "OUT1",
"type": "output",
"description": "Output clock 1 with programmable signal amplitude when configured as differential; left unconnected if unused."
},
{
"number": "26",
"name": "VDDS",
"type": "power_in",
"description": "Status output supply that sets the VOL/VOH of the LOLb and LOS_XAXBb outputs; a 0.1 µF to 1.0 µF bypass capacitor is recommended."
},
{
"number": "27",
"name": "LOLb",
"type": "output",
"description": "Loss-of-lock output that is high when the DSPLL is locked and low when out of lock; no external pull-up or pull-down is needed."
},
{
"number": "28",
"name": "LOS_XAXBb",
"type": "output",
"description": "Loss-of-signal output that indicates a loss of signal at the XA/XB pins."
},
{
"number": "29",
"name": "VDDO2",
"type": "power_in",
"description": "Output clock supply for OUT2 driver at 3.3 V, 2.5 V or 1.8 V; leave unconnected if the output driver is unused."
},
{
"number": "30",
"name": "OUT2b",
"type": "output",
"description": "Complementary output clock 2 with register-configurable output format; left unconnected if unused."
},
{
"number": "31",
"name": "OUT2",
"type": "output",
"description": "Output clock 2 with programmable signal amplitude when configured as differential; left unconnected if unused."
},
{
"number": "32",
"name": "VDD",
"type": "power_in",
"description": "Core supply voltage of 1.8 V, with a 1.0 µF bypass capacitor recommended."
},
{
"number": "33",
"name": "INTRb",
"type": "output",
"description": "Interrupt output asserted low on a device status change; it is push-pull and should be left unconnected when not in use."
},
{
"number": "34",
"name": "VDDO3",
"type": "power_in",
"description": "Output clock supply for OUT3 driver at 3.3 V, 2.5 V or 1.8 V; leave unconnected if the output driver is unused."
},
{
"number": "35",
"name": "OUT3b",
"type": "output",
"description": "Complementary output clock 3 with register-configurable output format; left unconnected if unused."
},
{
"number": "36",
"name": "OUT3",
"type": "output",
"description": "Output clock 3 with programmable signal amplitude when configured as differential; left unconnected if unused."
},
{
"number": "37",
"name": "IN_SEL1",
"type": "input",
"description": "Input reference select bit 1 used in manual pin-controlled mode with IN_SEL0; internally pulled up with ~20 kΩ and can be left unconnected."
},
{
"number": "38",
"name": "I2C_SEL",
"type": "input",
"description": "Serial interface select: high selects I2C mode and low selects SPI mode; internally pulled up with ~20 kΩ to the IO_VDD_SEL-selected voltage."
},
{
"number": "39",
"name": "VDD",
"type": "power_in",
"description": "Core supply voltage of 1.8 V, with a 1.0 µF bypass capacitor recommended."
},
{
"number": "40",
"name": "VDD",
"type": "power_in",
"description": "Core supply voltage of 1.8 V, with a 1.0 µF bypass capacitor recommended."
},
{
"number": "41",
"name": "FB_IN",
"type": "input",
"description": "External feedback input for optional zero delay mode; if unused and powered down it can be left floating."
},
{
"number": "42",
"name": "FB_INb",
"type": "input",
"description": "Complementary external feedback input for zero delay mode; if unused and powered down it can be left floating."
},
{
"number": "43",
"name": "IN0",
"type": "input",
"description": "Clock input that accepts differential or single-ended clock signals; it is high-impedance and must be terminated externally."
},
{
"number": "44",
"name": "IN0b",
"type": "input",
"description": "Complementary half of the IN0 clock input pair, accepting differential or single-ended clocks; it is high-impedance and must be terminated externally."
},
{
"number": "45",
"name": "EP",
"type": "passive",
"description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
}
],
"provenance": {
"extractor": "extract_pins 0.3",
"factory_chain": {
"factory": "2.0.0",
"extractor": "extract_pins 0.3",
"primary_model": "claude-haiku-5-5",
"primary_mode": "text",
"consensus_model": "claude-sonnet-5-5",
"consensus": "agreed",
"guards": "pin_guards 0.1: passed",
"guard_notes": [
"extractor flagged: The exposed ground pad is not given a number in the datasheet; it is listed as PAD and typed power_i; The Si5340 pin diagram text is garbled, so the VDD pin list (21, 32, 39, 40) was taken from the Si53; Pin 27 has no name of its own in Table 9.1; it is assigned the LOLb name from the shared Loss Of Loc",
"exposed pad 45 added from the footprint",
"dropped thermal pad ['EP'] absent from footprint"
],
"pages_sent": 16,
"cost_usd": 0.1022,
"at": "2026-10-30T17:30:20"
},
"datasheet": {
"url": "https://datasheet.lcsc.com/datasheet/pdf/ca70372027a39ec31fca5e051b591a4a.pdf",
"pages": 49,
"sha256": "a3f57dfa26cfac63",
"source_tier": "mfr"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 45,
"described": 45,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
"symbol": "viewers/symbol.html",
"footprint": "viewers/footprint.html"
},
"models_3d": [
{
"file": "si5340b-d-gm.step",
"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
7,
7,
0.77
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "e095902326bdaee7dcc9926c9d1613852bfa37bad68a82560157ca7fe509925a",
"checked": "2026-10-30",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "si5340b-d-gm-etched.step",
"role": "eda",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
7,
7,
0.77
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "4e090646092b588efc9e17a66631f46055f0d412df8d9c33bddaffea94b86371",
"checked": "2026-10-30",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
}
],
"package_dims": {
"package_code": "44-QFN (7x7 mm)",
"source_page": 43,
"D": {
"nom_mm": 7,
"range_mm": [
null,
null
]
},
"E1": {
"nom_mm": 7,
"range_mm": [
null,
null
]
},
"e": {
"nom_mm": 0.5,
"range_mm": [
null,
null
]
},
"A": {
"nom_mm": 0.85,
"range_mm": [
0.8,
0.9
]
},
"source": "datasheet package drawing, every number found on its page (extract_pins --task dims)",
"model_check": {
"file": "si5340b-d-gm.step",
"verdict": "PASS",
"reasons": [
"height within the datasheet's package drawing"
],
"by": "factory/package_fit.py"
}
}
},
"metadata": {
"specs": {
"Manufacturer": "Skyworks Solutions",
"Package": "QFN-44(7x7)",
"Category": "RTC/Clock Chip",
"Pins": "45"
},
"appearance": {
"housing": {
"quote": "4. Recommended card reflow profile is per the JEDEC/IPC J-STD-020 specification for Small Body Components.",
"page": 42,
"doc": "ds.pdf",
"material": "PC"
},
"version": 1,
"datasheet_sha256": "a3f57dfa26cfac63c44024a24c0d587964a666e8e809cf0109431dc7b9fde6b8"
},
"characteristics": {
"version": 1,
"source": "datasheet",
"datasheet_sha256": "a3f57dfa26cfac63c44024a24c0d587964a666e8e809cf0109431dc7b9fde6b8",
"rows": [
{
"name": "Ambient Temperature",
"symbol": "TA",
"kind": "recommended_operating",
"unit": "°C",
"min": -40,
"typ": 25,
"max": 85,
"conditions": "",
"source_page": 17,
"source": "datasheet"
},
{
"name": "Junction Temperature",
"symbol": "TJMAX",
"kind": "recommended_operating",
"unit": "°C",
"min": null,
"typ": null,
"max": 125,
"conditions": "",
"source_page": 17,
"source": "datasheet"
},
{
"name": "Core Supply Voltage",
"symbol": "VDD",
"kind": "recommended_operating",
"unit": "V",
"min": 1.71,
"typ": 1.8,
"max": 1.89,
"conditions": "",
"source_page": 17,
"source": "datasheet"
},
{
"name": "Core Supply Voltage (3.3 V)",
"symbol": "VDDA",
"kind": "recommended_operating",
"unit": "V",
"min": 3.14,
"typ": 3.3,
"max": 3.47,
"conditions": "",
"source_page": 17,
"source": "datasheet"
},
{
"name": "Output Driver Supply Voltage",
"symbol": "VDDO",
"kind": "recommended_operating",
"unit": "V",
"min": 3.14,
"typ": 3.3,
"max": 3.47,
"conditions": "",
"source_page": 17,
"source": "datasheet"
},
{
"name": "Output Driver Supply Voltage",
"symbol": "VDDO",
"kind": "recommended_operating",
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"min": 2.37,
"typ": 2.5,
"max": 2.62,
"conditions": "",
"source_page": 17,
"source": "datasheet"
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{
"name": "Output Driver Supply Voltage",
"symbol": "VDDO",
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"min": 1.71,
"typ": 1.8,
"max": 1.89,
"conditions": "",
"source_page": 17,
"source": "datasheet"
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{
"name": "Core Supply Current",
"symbol": "IDD",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 115,
"max": 230,
"conditions": "Si5340/41; Si5340 test config: 4 x 2.5 V LVDS outputs enabled @ 156.25 MHz",
"source_page": 18,
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{
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"typ": 120,
"max": 130,
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"source": "datasheet"
},
{
"name": "Output Buffer Supply Current, LVPECL Output",
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"conditions": "LVPECL output @ 156.25 MHz",
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{
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{
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{
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