component
KY485LEEN
Public Made by Adomby adom
Keysemi RS-485/RS-422 ICs, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
Open in new tab ↗
Loads when you scroll to it. Unloads after 5 minutes in the background.
Symbol & Footprint
Schematic Symbol
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
PCB Footprint
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
Datasheet
Open in new tab ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
README
markdownKY485LEEN
Keysemi · RS-485/RS-422 ICs · SOIC-8
KY485LEEN from Keysemi, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | RO | output | Receiver output: RO goes high when A−B ≥ −50mV and low when A−B ≤ −200mV, while RE is low. |
| 2 | RE | input | Receiver output enable: driving RE low enables RO and RE high makes RO high-impedance; RE high with DE low enters low-power shutdown, and RE is a hot-swap input. |
| 3 | DE | input | Driver output enable: driving DE high enables the driver outputs, which are high-impedance when DE is low; DE low with RE high enters low-power shutdown, and DE is a hot-swap input. |
| 4 | DI | input | Driver input: with DE high, a low on DI forces the non-inverting output low and the inverting output high, and a high on DI forces the reverse. |
| 5 | GND | power_in | Ground reference for all device voltages. |
| 6 | A | bidirectional | Non-inverting receiver input and non-inverting driver output; voltages on A and B are limited to −8V to +13V referenced to GND. |
| 7 | B | bidirectional | Inverting receiver input and inverting driver output; voltages on A and B are limited to −8V to +13V referenced to GND. |
| 8 | VCC | power_in | Positive supply, VCC = +5V ±5%, with VCC bypassed to GND by a 0.1µF capacitor; absolute maximum supply is +6V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Keysemi |
| Package | SOIC-8 |
| Category | Interface ICs |
| Pins | 8 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply voltage | VCC | -5 | 5 | % | VCC = +5V ±5% | 2 | |
| Supply Voltage | VCC | 6 | V | All voltages referenced to GND | 1 | ||
| DE, RE-, DI voltage | DE, RE-, DI | -0.3 | 6 | V | All voltages referenced to GND | 1 | |
| A, B voltage | A, B | -8 | 13 | V | All voltages referenced to GND | 1 | |
| Operating temperature range | -40 | 125 | °C | 1 | |||
| Junction temperature | 150 | °C | 1 | ||||
| Storage temperature range | -65 | 150 | °C | 1 | |||
| Lead temperature | 300 | °C | soldering 10s | 1 | |||
| Differential Driver Output (RS-422) | VOD2 | 2 | V | Figure1, R = 50Ω (RS-422) | 2 | ||
| Differential Driver Output (RS-485) | VOD2 | 1.5 | V | Figure1, R = 27Ω (RS-485) | 2 | ||
| Change in Magnitude of Differential Output Voltage | ∆VOD | 0.2 | V | Figure1, R =50Ω or R= 27Ω | 2 | ||
| Driver Common-Mode Output Voltage | VOC | 3 | V | Figure1, R=50Ω or R = 27Ω | 2 | ||
| Change in Magnitude of Common-Mode Voltage | ∆VOC | 0.2 | V | Figure1, R=50Ω or R = 27Ω | 2 | ||
| Input High Voltage | VIH1 | 2 | V | DE, DI, RE | 2 | ||
| Input Low Voltage | VIL1 | 0.8 | V | DE, DI, RE | 2 | ||
| Input Current | IIN1 | -2 | 2 | µA | DE, DI, RE | 2 | |
| Input Current (A and B) | IIN4 | 125 | µA | DE = GND, VCC=GND or 5.25V, VIN=12V | 2 | ||
| Input Current (A and B) | IIN4 | -75 | µA | DE = GND, VCC=GND or 5.25V, VIN = -7V | 2 | ||
| Driver Short-Circuit Output Current | VOD1 | -250 | mA | -7V ≤ VOUT ≤ VCC | 2 | ||
| Driver Short-Circuit Output Current | VOD1 | 250 | mA | 0V ≤ VOUT ≤ 12V | 2 | ||
| Driver Short-Circuit Output Current | VOD1 | -25 | 25 | mA | 0V ≤ VOUT ≤ VCC | 2 | |
| Receiver Differential Threshold Voltage | VTH | -200 | -125 | -50 | mV | -7V ≤ VCM ≤ +12V | 2 |
| Receiver Output Low Voltage | VOL | 0.4 | V | IO = -4mA, VID = -50mV | 2 | ||
| Three-State Output Current at Receiver | IOZR | -1 | 1 | µA | 0.4V ≤ VO ≤ 2.4V | 2 | |
| Supply Current | ICC | 530 | 900 | µA | No load, RE- =DI=GND or VCC, DE = VCC | 2 | |
| Supply Current | ICC | 500 | 600 | µA | No load, RE- =DI=GND or VCC, DE = GND | 2 | |
| Supply Current in Shutdown Mode | ISHDN | 2.5 | 10 | µA | DE = GND, VRE- = VCC | 2 | |
| ESD Protection (A,B) Air Gap Discharge | -16 | 16 | KV | IEC 61000-4-2 | 2 | ||
| ESD Protection (A,B) Human Body Model | -8 | 8 | KV | Human Body Model | 2 | ||
| ESD Protection (all other pins) Human Body Model | -5 | 5 | KV | Human Body Model | 2 | ||
| Driver Input to Output (tDPLH) | tDPLH | 250 | 720 | 1000 | ns | Figures 3 and 5, RDIFF = 54Ω, CL1 = CL2 = 100pF | 3 |
| Driver Input to Output (tDPHL) | tDPHL | 250 | 720 | 1000 | ns | Figures 3 and 5, RDIFF = 54Ω, CL1 = CL2 = 100pF | 3 |
| Driver Output Skew | / tDPLH - tDPHL / tDSKEW | -100 | -3 | 100 | ns | Figures 3 and 5, RDIFF = 54Ω, CL1 = CL2 = 100pF | 3 |
| Driver Rise or Fall Time | tDR, tDF | 200 | 530 | 750 | ns | Figures 3 and 5, RDIFF = 54Ω, CL1 = CL2 = 100pF | 3 |
| Driver Enable to Output High | tDZH | 2500 | ns | Figures 4 and 6, CL = 100pF, S2 closed | 3 | ||
| Driver Enable to Output Low | tDZL | 2500 | ns | Figures 4 and 6, CL = 100pF, S1 closed | 3 | ||
| Driver Disable Time from Low | tDLZ | 100 | ns | Figures 4 and 6, CL = 15pF, S1 closed | 3 | ||
| Driver Disable Time from High | tDHZ | 100 | ns | Figures 4 and 6, CL = 15pF, S2 closed | 3 | ||
| Differential Receiver Skew | / tRPLH - tRPHL / tRSKD | -30 | 3 | 30 | ns | Figures 7 and 9; / VID / ≥ 2.0V; rise and fall time of VID ≤ 15ns | 3 |
| Time to Shutdown | tSHDN | 50 | 200 | 600 | ns | (Note 4) | 3 |
| Driver Enable from Shutdown to Output High | tDZH(SHDN) | 4500 | ns | Figures 4 and 6, CL = 15pF, S2 closed | 3 | ||
| Driver Enable from Shutdown to Output Low | tDZL(SHDN) | 4500 | ns | Figures 4 and 6, CL = 15pF, S1 closed | 3 | ||
| Receiver Enable from Shutdown to Output High | tRZH(SHDN) | 3500 | ns | Figures 2 and 8, CL = 100pF, S2 closed | 3 | ||
| Receiver Enable from Shutdown to Output Low | tRZL(SHDN) | 3500 | ns | Figures 2 and 8, CL = 100pF, S1 closed | 3 |
CAD (KiCad official)
- Symbol:
KY485LEEN - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
ky485leen-etched.step/ky485leen-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ky485leen.step/ky485leen.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Keysemi datasheet (8 pp, sha256
6cfba6f713b932ba, retrieved 2026-10-29, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).