component
GB490
Public Made by Adomby adom
GEC RS-485 / RS-422 ICs, SOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownGB490
GEC · RS-485 / RS-422 ICs · SOP-8
GB490 from GEC, in a SOP-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 | Vcc | power_in | Positive supply, nominally 5 V (recommended 4.75 V to 5.25 V, absolute maximum 7 V), bypassed to GND with a 0.1 µF capacitor. |
| 2 | RO | output | Receiver output: when the receiver is enabled, RO is high if V(A)-V(B) > -50 mV and low if V(A)-V(B) < -200 mV, and it is held high for open or shorted inputs (fail-safe). |
| 3 | DI | input | Driver input: DI low forces Y low and Z high, and DI high forces Y high and Z low. |
| 4 | GND | power_in | Ground reference for the device; all voltages are referenced to this pin. |
| 5 | Y | output | Bus interface pin carrying the non-inverting driver output, which follows DI. |
| 6 | Z | output | Bus interface pin carrying the inverting driver output, which is the complement of DI. |
| 7 | B | input | Bus interface pin serving as the inverting receiver input, with a 1/8 unit-load input impedance (96 kΩ). |
| 8 | A | input | Bus interface pin serving as the non-inverting receiver input, with a 1/8 unit-load input impedance (96 kΩ). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | GEC |
| Package | SOP-8 |
| Category | Interface |
| 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 |
|---|---|---|---|---|---|---|---|
| 输入高电平 | VIH1 | 2 | 伏 | DI | 2 | ||
| 输入低电平 | VIL1 | 0.8 | 伏 | DI | 2 | ||
| 输入电流 | IIN1 | -1 | 1 | 微安 | DI (注 2) | 2 | |
| 输入电流(Y,Z,A,B) | IIN4 | 125 | 微安 | VCC=GND, VIN=12V | 2 | ||
| 输入电流(Y,Z,A,B) | IIN4 | -100 | 微安 | VCC=GND, VIN=-7V | 2 | ||
| 驱动器输出短路电流 | IOD1 | -100 | 毫安 | -7V≤VOUT≤VCC | 2 | ||
| 驱动器输出短路电流 | IOD1 | 100 | 毫安 | 0V≤VOUT≤12V | 2 | ||
| 驱动器输出短路电流 | IOD1 | -25 | 25 | 毫安 | 0V≤VOUT≤VCC | 2 | |
| 差分驱动输出 | VOD2 | 2 | 伏 | 图 1,R=50Ω(RS-422) | 2 | ||
| 差分驱动输出 | VOD2 | 1.5 | 伏 | 图 1,R=27Ω(RS-485) | 2 | ||
| 差分输出幅值变化 | ∆VOD | 0.2 | 伏 | 图 1,R =50ΩorR=27Ω | 2 | ||
| 驱动器输出共模电平 | VOC | 3 | 伏 | 图 1,R=50ΩorR=27Ω | 2 | ||
| 驱动器输出共模电平变化 | ∆VOC | 0.2 | 伏 | 图 1,R=50ΩorR=27Ω | 2 | ||
| 接收器差分输入阈值电压 | VTH | -200 | -50 | 毫伏 | -7V≤VCM≤+12V | 2 | |
| 接收器输出低电平 | VOL | 0.4 | 伏 | IO=4mA,VID=-1V | 2 | ||
| 接收器输入阻抗 | RIN | 96 | 千欧姆 | -7V≤VCM≤+12V | 2 | ||
| 接收器输出短路电流 | IOSR | -7 | 95 | 毫安 | 0V≤VRO≤VCC | 3 | |
| 静态供电电流 | ICC | 0.95 | 2 | 毫安 | No load | 3 | |
| 静电保护(A管脚,B管脚) 接触放电 | -12 | 12 | 千伏 | IEC 61000-4-2 接触放电 | 3 | ||
| 静电保护(A管脚,B管脚) 人体模型 | -15 | 15 | 千伏 | 人体模型 | 3 | ||
| 静电保护(其他管脚) 人体模型 | -4 | 4 | 千伏 | 人体模型 | 3 | ||
| 驱动器输入输出延时 | tDPLH | 250 | 720 | 1000 | 纳秒 | 图 2 和 3, RDIFF=54 欧姆，CL=54pF | 3 |
| 驱动器输入输出延时之差 | tDSKEW | -200 | -3 | 200 | 纳秒 | 图 2 和 3,RDIFF=54 欧姆，CL1=CL2=100pF | 3 |
| 驱动器上升、下降时间 | tDR, tDF | 400 | 700 | 1200 | 纳秒 | 图 2 和 3, RDIFF=54 欧姆，CL1=CL2=100pF | 3 |
| 最大速率 | fMAX | 500 | Kbps | 3 | |||
| 接收器输入输出延时 | tRPLH, tRPHL | 125 | 200 | 纳秒 | 图4和5；/VID/≥2.0V；VID上升下降时间小于15纳秒 | 3 | |
| 接收器输入输出延时之差 | tRSKD | -30 | 10 | 30 | 纳秒 | 图4和5；/VID/≥2.0V；VID上升下降时间小于15纳秒 | 3 |
| 最大工作电压 | VCC | 7 | 伏 | 6 | |||
| 逻辑脚电压 DI，RO | -0.3 | 7 | 伏 | 6 | |||
| 总线脚电压 A，B，Y，Z | -8 | 13 | ℃ | 6 | |||
| 存储温度 | TSTG | -65 | 150 | ℃ | 6 | ||
| 最高结温 | TJ | 150 | ℃ | 6 | |||
| ESD-HBM | ESD-HBM | 2000 | 伏 | 6 | |||
| 推荐工作电压 | VDD | 4.75 | 5 | 5.25 | 伏 | 6 | |
| 工作温度 | TA | -40 | 125 | ℃ | 6 | ||
| 输入迟滞 | VHYS | 100 | 毫伏 | DI | 2 | ||
| 接收器差分输入阈值电压迟滞 | ∆VTH | 40 | 毫伏 | 2 |
CAD (KiCad official)
- Symbol:
GB490 - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files:
gb490-etched.step/gb490-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);gb490.step/gb490.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: GEC datasheet (9 pp, sha256
5c5e741f991a5715, retrieved 2026-10-18, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- 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).