component
CD4521BE
Public Made by Adomby adom
Texas Instruments Counters / Dividers, DIP-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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"slug": "cd4521be",
"title": "CD4521BE",
"brief": "Texas Instruments Counters / Dividers, DIP-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"version": "0.1.0",
"license": "CC-BY-SA-4.0",
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"component": {
"mpn": "CD4521BE",
"manufacturer": "Texas Instruments",
"package": "DIP-16",
"pin_count": 16,
"category": "Logic ICs",
"subcategory": "Counters / Dividers",
"datasheet": "https://www.ti.com/lit/ds/symlink/cd4521b.pdf",
"parts": {
"symbol": "cd4521be.kicad_sym",
"footprint": "cd4521be.kicad_mod",
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"model_3d_step": "cd4521be-etched.step",
"model_3d_step_plain": "cd4521be.step",
"lbr": "cd4521be.lbr"
},
"distributor_links": {
"lcsc": "C353988",
"digikey": "2156-CD4521BE-ND",
"mouser": "595-CD4521BE"
},
"distributor_check": {
"checked_at": "2026-10-30T22:24:37Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "2156-CD4521BE-ND",
"status": "found"
},
"mouser": {
"pn": "595-CD4521BE",
"status": "found"
}
},
"pins": [
{
"number": "1",
"name": "Q24",
"type": "output",
"description": "Buffered counter output of stage 24 with count capacity 2^24 = 16,777,216."
},
{
"number": "2",
"name": "RESET",
"type": "input",
"description": "A HIGH level resets the counter to the all-0s state and disables the oscillator, and the input is limited to -0.5 V to VDD +0.5 V."
},
{
"number": "3",
"name": "VSS'",
"type": "power_in",
"description": "Oscillator Vss' pin brought out from the crystal oscillator to allow use of external resistors for low-power operation."
},
{
"number": "4",
"name": "OUT 2",
"type": "output",
"description": "Oscillator output 2 of the RC or crystal oscillator circuit, which can be tied to IN 2 in the functional test mode."
},
{
"number": "5",
"name": "VDD'",
"type": "power_in",
"description": "Oscillator VDD' pin brought out from the crystal oscillator to allow use of external resistors for low-power operation."
},
{
"number": "6",
"name": "IN 2",
"type": "input",
"description": "Oscillator input 2 (counter clock input in the functional test mode), limited to -0.5 V to VDD +0.5 V with an input pulse frequency up to 2 MHz at 5 V, 5 MHz at 10 V and 6.5 MHz at 15 V."
},
{
"number": "7",
"name": "OUT 1",
"type": "output",
"description": "Oscillator output 1 used in the RC or crystal oscillator circuit."
},
{
"number": "8",
"name": "VSS",
"type": "power_in",
"description": "Ground (negative supply) pin, the reference for the voltage ratings."
},
{
"number": "9",
"name": "IN 1",
"type": "input",
"description": "Oscillator input 1 that sets the RC or crystal oscillator configuration and must be tied HIGH or LOW when not in use."
},
{
"number": "10",
"name": "Q18",
"type": "output",
"description": "Buffered counter output of stage 18 with count capacity 2^18 = 262,144."
},
{
"number": "11",
"name": "Q19",
"type": "output",
"description": "Buffered counter output of stage 19 with count capacity 2^19 = 524,288."
},
{
"number": "12",
"name": "Q20",
"type": "output",
"description": "Buffered counter output of stage 20 with count capacity 2^20 = 1,048,576."
},
{
"number": "13",
"name": "Q21",
"type": "output",
"description": "Buffered counter output of stage 21 with count capacity 2^21 = 2,097,152."
},
{
"number": "14",
"name": "Q22",
"type": "output",
"description": "Buffered counter output of stage 22 with count capacity 2^22 = 4,194,304."
},
{
"number": "15",
"name": "Q23",
"type": "output",
"description": "Buffered counter output of stage 23 with count capacity 2^23 = 8,388,608."
},
{
"number": "16",
"name": "VDD",
"type": "power_in",
"description": "Positive supply pin with a recommended range of 3 V to 18 V and an absolute maximum of -0.5 V to +20 V referenced to VSS."
}
],
"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": "vision",
"consensus_model": "claude-opus-5-5",
"consensus": "agreed",
"guards": "pin_guards 0.1: passed",
"guard_notes": [
"extractor flagged: Pin 4 (OUT2) is listed as an output, but the functional test sequence ties OUT 2 to IN 2 and says it; VSS' (pin 3) and VDD' (pin 5) are described only as pins brought out from the crystal oscillator for",
"vision extraction: provenance cannot be text-verified; needs consensus"
],
"pages_sent": 12,
"cost_usd": 0.0733,
"at": "2026-10-30T22:24:27"
},
"datasheet": {
"url": "https://www.ti.com/lit/ds/symlink/cd4521b.pdf",
"pages": 21,
"sha256": "0f0f6fb3629f4701",
"source_tier": "mfr"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 16,
"described": 16,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
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"footprint": "viewers/footprint.html"
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"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "body on z = 0, through-hole leads below",
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"zmin_mm": -3.3,
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"footprint_binding": "identity",
"sha256": "17a30b1f0ab3fd5384a1231e3c63c394888d5b952c542a8c189e023ed3467464",
"checked": "2026-10-30",
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}
]
},
"metadata": {
"specs": {
"Manufacturer": "Texas Instruments",
"Package": "DIP-16",
"Category": "Logic ICs",
"Pins": "16"
}
},
"variants": [],
"sections": [
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"discovery_triggers": [
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"discovery_pitch": "CD4521BE (Texas Instruments) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
"author": {
"name": "Ray",
"email": "[email protected]"
},
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