component
AT89C51ED2-RLTUM
Public Made by Adomby adom
Microchip Tech Pre-ordered MCUs, QFP-44(10x10). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
"schema_version": 1,
"type": "component",
"slug": "at89c51ed2-rltum",
"title": "AT89C51ED2-RLTUM",
"brief": "Microchip Tech Pre-ordered MCUs, QFP-44(10x10). 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",
"embedded processors & controllers",
"at89c51ed2-rltum",
"factory-2.0.0",
"extractor-text"
],
"component": {
"mpn": "AT89C51ED2-RLTUM",
"manufacturer": "Microchip Tech",
"package": "QFP-44(10x10)",
"pin_count": 44,
"category": "Embedded Processors & Controllers",
"subcategory": "Pre-ordered MCUs",
"datasheet": "https://datasheet.lcsc.com/datasheet/pdf/63f04ddd081c80e61deab3ba874817a6.pdf",
"parts": {
"symbol": "at89c51ed2-rltum.kicad_sym",
"footprint": "at89c51ed2-rltum.kicad_mod",
"model_3d": "at89c51ed2-rltum-hero.glb",
"model_3d_plain": "at89c51ed2-rltum-etched.glb",
"model_3d_step": "at89c51ed2-rltum-etched.step",
"model_3d_step_plain": "at89c51ed2-rltum.step",
"lbr": "at89c51ed2-rltum.lbr"
},
"distributor_links": {
"lcsc": "C1337115",
"digikey": "AT89C51ED2-RLTUM-ND",
"mouser": "556-A89C51ED2RLTUM"
},
"distributor_check": {
"checked_at": "2026-10-30T11:57:41Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "AT89C51ED2-RLTUM-ND",
"status": "found",
"lifecycle": "Obsolete"
},
"mouser": {
"pn": "556-A89C51ED2RLTUM",
"status": "found",
"lifecycle": "Obsolete"
}
},
"pins": [
{
"number": "1",
"name": "P1.5/CEX2/MISO",
"type": "bidirectional",
"description": "Port 1 bit 5 with internal pull-up, also PCA module 2 capture/compare I/O (CEX2) and SPI MISO."
},
{
"number": "2",
"name": "P1.6/CEX3/SCK",
"type": "bidirectional",
"description": "Port 1 bit 6 with internal pull-up, also PCA module 3 capture/compare I/O (CEX3) and SPI serial clock (SCK)."
},
{
"number": "3",
"name": "P1.7/CEX4/MOSI",
"type": "bidirectional",
"description": "Port 1 bit 7 with internal pull-up, also PCA module 4 capture/compare I/O (CEX4) and SPI MOSI."
},
{
"number": "4",
"name": "RST",
"type": "input",
"description": "Reset: a high for two machine cycles while the oscillator is running resets the device; has an internal diffused resistor to VSS and is an output when the hardware watchdog forces a reset."
},
{
"number": "5",
"name": "P3.0/RxD",
"type": "bidirectional",
"description": "Port 3 bit 0 with internal pull-up, also serial input port (RXD)."
},
{
"number": "6",
"name": "NIC",
"type": "unconnected",
"description": "Not internally connected."
},
{
"number": "7",
"name": "P3.1/TxD",
"type": "bidirectional",
"description": "Port 3 bit 1 with internal pull-up, also serial output port (TXD)."
},
{
"number": "8",
"name": "P3.2/INT0",
"type": "bidirectional",
"description": "Port 3 bit 2 with internal pull-up, also external interrupt 0 input."
},
{
"number": "9",
"name": "P3.3/INT1",
"type": "bidirectional",
"description": "Port 3 bit 3 with internal pull-up, also external interrupt 1 input."
},
{
"number": "10",
"name": "P3.4/T0",
"type": "bidirectional",
"description": "Port 3 bit 4 with internal pull-up, also Timer 0 external input."
},
{
"number": "11",
"name": "P3.5/T1",
"type": "bidirectional",
"description": "Port 3 bit 5 with internal pull-up, also Timer 1 external input."
},
{
"number": "12",
"name": "P3.6/WR",
"type": "bidirectional",
"description": "Port 3 bit 6 with internal pull-up, also external data memory write strobe (WR)."
},
{
"number": "13",
"name": "P3.7/RD",
"type": "bidirectional",
"description": "Port 3 bit 7 with internal pull-up, also external data memory read strobe (RD)."
},
{
"number": "14",
"name": "XTAL2",
"type": "output",
"description": "Output from the inverting oscillator amplifier."
},
{
"number": "15",
"name": "XTAL1",
"type": "input",
"description": "Input to the inverting oscillator amplifier and to the internal clock generator circuits."
},
{
"number": "16",
"name": "VSS",
"type": "power_in",
"description": "Ground: 0V reference."
},
{
"number": "17",
"name": "NIC",
"type": "unconnected",
"description": "Not internally connected."
},
{
"number": "18",
"name": "P2.0/A8",
"type": "bidirectional",
"description": "Port 2 bit 0 with internal pull-up, also high-order address bit A8 for external memory."
},
{
"number": "19",
"name": "P2.1/A9",
"type": "bidirectional",
"description": "Port 2 bit 1 with internal pull-up, also high-order address bit A9 for external memory."
},
{
"number": "20",
"name": "P2.2/A10",
"type": "bidirectional",
"description": "Port 2 bit 2 with internal pull-up, also high-order address bit A10 for external memory."
},
{
"number": "21",
"name": "P2.3/A11",
"type": "bidirectional",
"description": "Port 2 bit 3 with internal pull-up, also high-order address bit A11 for external memory."
},
{
"number": "22",
"name": "P2.4/A12",
"type": "bidirectional",
"description": "Port 2 bit 4 with internal pull-up, also high-order address bit A12 for external memory."
},
{
"number": "23",
"name": "P2.5/A13",
"type": "bidirectional",
"description": "Port 2 bit 5 with internal pull-up, also high-order address bit A13 for external memory."
},
{
"number": "24",
"name": "P2.6/A14",
"type": "bidirectional",
"description": "Port 2 bit 6 with internal pull-up, also high-order address bit A14 for external memory."
},
{
"number": "25",
"name": "P2.7/A15",
"type": "bidirectional",
"description": "Port 2 bit 7 with internal pull-up, also high-order address bit A15 for external memory."
},
{
"number": "26",
"name": "PSEN",
"type": "output",
"description": "Program Strobe Enable: read strobe to external program memory, activated twice each machine cycle during external code execution and not activated for internal fetches."
},
{
"number": "27",
"name": "ALE/PROG",
"type": "output",
"description": "Address Latch Enable output at 1/6 (1/3 in X2 mode) of the oscillator frequency, and program pulse input (PROG) during Flash programming; can be disabled with AUXR.0."
},
{
"number": "28",
"name": "NIC",
"type": "unconnected",
"description": "Not internally connected."
},
{
"number": "29",
"name": "EA",
"type": "input",
"description": "External Access Enable: must be held low to fetch code from external program memory 0000H to FFFFH; latched on reset if security level 1 is programmed."
},
{
"number": "30",
"name": "P0.7/AD7",
"type": "bidirectional",
"description": "Port 0 bit 7, open-drain bidirectional I/O and multiplexed address/data bit AD7 for external memory."
},
{
"number": "31",
"name": "P0.6/AD6",
"type": "bidirectional",
"description": "Port 0 bit 6, open-drain bidirectional I/O and multiplexed address/data bit AD6 for external memory."
},
{
"number": "32",
"name": "P0.5/AD5",
"type": "bidirectional",
"description": "Port 0 bit 5, open-drain bidirectional I/O and multiplexed address/data bit AD5 for external memory."
},
{
"number": "33",
"name": "P0.4/AD4",
"type": "bidirectional",
"description": "Port 0 bit 4, open-drain bidirectional I/O and multiplexed address/data bit AD4 for external memory."
},
{
"number": "34",
"name": "P0.3/AD3",
"type": "bidirectional",
"description": "Port 0 bit 3, open-drain bidirectional I/O and multiplexed address/data bit AD3 for external memory."
},
{
"number": "35",
"name": "P0.2/AD2",
"type": "bidirectional",
"description": "Port 0 bit 2, open-drain bidirectional I/O and multiplexed address/data bit AD2 for external memory."
},
{
"number": "36",
"name": "P0.1/AD1",
"type": "bidirectional",
"description": "Port 0 bit 1, open-drain bidirectional I/O and multiplexed address/data bit AD1 for external memory."
},
{
"number": "37",
"name": "P0.0/AD0",
"type": "bidirectional",
"description": "Port 0 bit 0, open-drain bidirectional I/O and multiplexed address/data bit AD0 for external memory."
},
{
"number": "38",
"name": "VCC",
"type": "power_in",
"description": "Power supply voltage for normal, idle and power-down operation (2.7V to 5.5V)."
},
{
"number": "39",
"name": "NIC",
"type": "unconnected",
"description": "Not internally connected."
},
{
"number": "40",
"name": "P1.0/T2",
"type": "bidirectional",
"description": "Port 1 bit 0 with internal pull-up, also Timer/Counter 2 external count input/clock-out (T2)."
},
{
"number": "41",
"name": "P1.1/T2EX/SS",
"type": "bidirectional",
"description": "Port 1 bit 1 with internal pull-up, also Timer 2 reload/capture/direction control (T2EX) and SPI slave select (SS)."
},
{
"number": "42",
"name": "P1.2/ECI",
"type": "bidirectional",
"description": "Port 1 bit 2 with internal pull-up, also external clock input for the PCA (ECI)."
},
{
"number": "43",
"name": "P1.3/CEX0",
"type": "bidirectional",
"description": "Port 1 bit 3 with internal pull-up, also PCA module 0 capture/compare external I/O (CEX0)."
},
{
"number": "44",
"name": "P1.4/CEX1",
"type": "bidirectional",
"description": "Port 1 bit 4 with internal pull-up, also PCA module 1 capture/compare external I/O (CEX1)."
}
],
"provenance": {
"extractor": "extract_pins 0.3",
"factory_chain": {
"factory": "2.0.0",
"extractor": "extract_pins 0.3",
"primary_model": "claude-sonnet-5-5",
"primary_mode": "text",
"consensus_model": "claude-sonnet-5-5",
"consensus": "agreed",
"guards": "pin_guards 0.1: passed",
"guard_notes": [
"extractor flagged: NIC pin numbers (6, 17, 28, 39) are not printed in the pin table; they were derived by elimination, ; RST is listed as input in the table but is also an output when the hardware watchdog forces a reset.; The MPN suffix RLTUM maps to VQFP44 in the ordering table (QFP-44 10x10 hint). The datasheet gives t"
],
"pages_sent": 15,
"cost_usd": 0.1862,
"at": "2026-10-30T11:57:21"
},
"datasheet": {
"url": "https://datasheet.lcsc.com/datasheet/pdf/63f04ddd081c80e61deab3ba874817a6.pdf",
"pages": 137,
"sha256": "eca60c463d595aea",
"source_tier": "mfr"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 44,
"described": 44,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
"symbol": "viewers/symbol.html",
"footprint": "viewers/footprint.html"
},
"models_3d": [
{
"file": "at89c51ed2-rltum.step",
"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
12,
12,
1.5
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "81aae6270b5c742bed79a8a35e9adf7fbed97c42e341e6b25ab20c1783b93b5d",
"checked": "2026-10-30",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "at89c51ed2-rltum-etched.step",
"role": "eda",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
12,
12,
1.5
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "6a913ce857d5772ae11a8b3117b4ccb4dfd0da1d2a516916a3889c4a56b01409",
"checked": "2026-10-30",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
}
]
},
"metadata": {
"specs": {
"Manufacturer": "Microchip Tech",
"Package": "QFP-44(10x10)",
"Category": "Embedded Processors & Controllers",
"Pins": "44"
},
"characteristics": {
"version": 1,
"source": "datasheet",
"datasheet_sha256": "eca60c463d595aeae79128a8cb5ed2c2e3d4a517395c9e9256cc85c8c5f3a7fd",
"rows": [
{
"name": "Operating temperature (industrial)",
"symbol": "TA",
"kind": "recommended_operating",
"unit": "°C",
"min": -40,
"typ": null,
"max": 85,
"conditions": "I = industrial",
"source_page": 114,
"source": "datasheet"
},
{
"name": "Supply voltage range",
"symbol": "VCC",
"kind": "recommended_operating",
"unit": "V",
"min": 2.7,
"typ": null,
"max": 5.5,
"conditions": "F = 0 to 40 MHz (internal and external code execution)",
"source_page": 114,
"source": "datasheet"
},
{
"name": "Supply voltage range, 60 MHz internal code",
"symbol": "VCC",
"kind": "recommended_operating",
"unit": "V",
"min": 4.5,
"typ": null,
"max": 5.5,
"conditions": "F = 0 to 60 MHz (internal code execution only)",
"source_page": 114,
"source": "datasheet"
},
{
"name": "Storage temperature",
"symbol": "Tstg",
"kind": "absolute_maximum",
"unit": "°C",
"min": -65,
"typ": null,
"max": 150,
"conditions": "",
"source_page": 114,
"source": "datasheet"
},
{
"name": "Voltage on VCC to VSS",
"symbol": "VCC",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.5,
"typ": null,
"max": 6.5,
"conditions": "",
"source_page": 114,
"source": "datasheet"
},
{
"name": "Voltage on any pin to VSS",
"symbol": "",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.5,
"typ": null,
"max": 5.5,
"conditions": "-0.5V to VCC + 0.5V (printed as VCC + 0.5)",
"source_page": 114,
"source": "datasheet"
},
{
"name": "Power dissipation",
"symbol": "",
"kind": "absolute_maximum",
"unit": "W",
"min": null,
"typ": null,
"max": 1,
"conditions": "",
"source_page": 114,
"source": "datasheet"
},
{
"name": "Input Low Voltage",
"symbol": "VIL",
"kind": "electrical",
"unit": "V",
"min": -0.5,
"typ": null,
"max": 0.2,
"conditions": "max printed 0.2 VCC - 0.1",
"source_page": 114,
"source": "datasheet"
},
{
"name": "Input High Voltage except RST, XTAL1",
"symbol": "VIH",
"kind": "electrical",
"unit": "V",
"min": 0.2,
"typ": null,
"max": null,
"conditions": "min printed 0.2 VCC + 0.9; max VCC + 0.5",
"source_page": 114,
"source": "datasheet"
},
{
"name": "Input High Voltage RST, XTAL1",
"symbol": "VIH1",
"kind": "electrical",
"unit": "V",
"min": 0.7,
"typ": null,
"max": null,
"conditions": "min printed 0.7 VCC; max VCC + 0.5",
"source_page": 114,
"source": "datasheet"
},
{
"name": "Output Low Voltage ports 1,2,3,4",
"symbol": "VOL",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.45,
"conditions": "VCC = 2.7V to 5.5V, IOL = 0.8 mA",
"source_page": 114,
"source": "datasheet"
},
{
"name": "Output Low Voltage port 0, ALE, PSEN",
"symbol": "VOL1",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.45,
"conditions": "VCC = 2.7V to 5.5V, IOL = 1.6 mA",
"source_page": 114,
"source": "datasheet"
},
{
"name": "Output High Voltage ports 1,2,3,4",
"symbol": "VOH",
"kind": "electrical",
"unit": "V",
"min": 0.9,
"typ": null,
"max": null,
"conditions": "VCC = 2.7V to 5.5V, IOH = -10 µA; min printed 0.9 VCC",
"source_page": 114,
"source": "datasheet"
},
{
"name": "Output High Voltage port 0, ALE, PSEN",
"symbol": "VOH1",
"kind": "electrical",
"unit": "V",
"min": 0.9,
"typ": null,
"max": null,
"conditions": "VCC = 2.7V to 5.5V, IOH = -10 µA; min printed 0.9 VCC",
"source_page": 115,
"source": "datasheet"
},
{
"name": "RST Pull-down Resistor",
"symbol": "RRST",
"kind": "electrical",
"unit": "kΩ",
"min": 50,
"typ": 200,
"max": 250,
"conditions": "",
"source_page": 115,
"source": "datasheet"
},
{
"name": "Logical 0 Input Current ports 1-5",
"symbol": "IIL",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": null,
"max": -50,
"conditions": "VIN = 0.45V",
"source_page": 115,
"source": "datasheet"
},
{
"name": "Input Leakage Current",
"symbol": "ILI",
"kind": "electrical",
"unit": "µA",
"min": -10,
"typ": null,
"max": 10,
"conditions": "0.45V < VIN < VCC",
"source_page": 115,
"source": "datasheet"
},
{
"name": "Logical 1 to 0 Transition Current ports 1-4",
"symbol": "ITL",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": null,
"max": -650,
"conditions": "VIN = 2.0V",
"source_page": 115,
"source": "datasheet"
},
{
"name": "Capacitance of I/O Buffer",
"symbol": "CIO",
"kind": "electrical",
"unit": "pF",
"min": null,
"typ": null,
"max": 10,
"conditions": "FC = 3 MHz, TA = 25°C",
"source_page": 115,
"source": "datasheet"
},
{
"name": "Power-down Current",
"symbol": "IPD",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 75,
"max": 150,
"conditions": "2.7 < VCC < 5.5V",
"source_page": 115,
"source": "datasheet"
},
{
"name": "Flash or EEdata programming time",
"symbol": "tWRITE",
"kind": "electrical",
"unit": "ms",
"min": null,
"typ": 7,
"max": 17,
"conditions": "2.7 < VCC < 5.5V",
"source_page": 115,
"source": "datasheet"
},
{
"name": "Internal POR/PFD VPFDP threshold",
"symbol": "VPFDP",
"kind": "electrical",
"unit": "V",
"min": 2.25,
"typ": 2.5,
"max": 2.69,
"conditions": "",
"source_page": 115,
"source": "datasheet"
},
{
"name": "Internal POR/PFD VPFDM threshold",
"symbol": "VPFDM",
"kind": "electrical",
"unit": "V",
"min": 2.15,
"typ": 2.35,
"max": 2.62,
"conditions": "",
"source_page": 115,
"source": "datasheet"
},
{
"name": "Internal POR/PFD Hysteresis",
"symbol": "Vhyst",
"kind": "electrical",
"unit": "mV",
"min": 70,
"typ": 140,
"max": 250,
"conditions": "",
"source_page": 115,
"source": "datasheet"
},
{
"name": "Maximum Vcc power supply slew rate",
"symbol": "dV/dt",
"kind": "electrical",
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