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LTC485CS8#TRPBF
Public Made by Adomby adom
Analog Devices RS-485 / RS-422 ICs, SOIC-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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Contents
README
markdownLTC485CS8#TRPBF
Analog Devices · RS-485 / RS-422 ICs · SOIC-8
LTC485CS8#TRPBF from Analog Devices, 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: when the receiver is enabled (RE low), RO goes high if A > B by 200mV and low if A < B by 200mV. |
| 2 | RE | input | Receiver output enable: a low enables the receiver output RO, and a high forces RO into a high-impedance state. |
| 3 | DE | input | Driver output enable: a high enables driver outputs A and B so the chip acts as a line driver, while a low forces the driver outputs into high impedance so the chip acts as a line receiver. |
| 4 | DI | input | Driver input: with the driver outputs enabled (DE high), a low on DI forces A low and B high, and a high on DI forces A high and B low. |
| 5 | GND | power_in | Ground connection. |
| 6 | A | bidirectional | Driver output / receiver input (non-inverting bus line); the driver output stays high-impedance over the -7V to 12V common mode range when disabled. |
| 7 | B | bidirectional | Driver output / receiver input (inverting bus line); the driver output stays high-impedance over the -7V to 12V common mode range when disabled. |
| 8 | VCC | power_in | Positive supply, specified as 4.75 V < VCC < 5.25 V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | SOIC-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 |
|---|---|---|---|---|---|---|---|
| Differential Driver Output Voltage (Unloaded) | VOD1 | 5 | V | IO = 0 | 2 | ||
| Differential Driver Output Voltage (with Load), RS422 | VOD2 | 2 | V | R = 50Ω (RS422) | 2 | ||
| Differential Driver Output Voltage (with Load), RS485 | VOD2 | 1.5 | 5 | V | R = 27Ω (RS485), Figure 1 | 2 | |
| Change in Magnitude of Driver Differential Output Voltage for Complementary States | ΔVOD | 0.2 | V | R = 27Ω or R = 50Ω, Figure 1 | 2 | ||
| Driver Common Mode Output Voltage | VOC | 3 | V | R = 27Ω or R = 50Ω, Figure 1 | 2 | ||
| Change in Magnitude of Driver Common Mode Output Voltage for Complementary States | Δ/VOC/ | 0.2 | V | R = 27Ω or R = 50Ω, Figure 1 | 2 | ||
| Supply Current, Outputs Enabled | ICC | 500 | 900 | μA | No Load, Pins 2, 3, 4 = 0V or 5V Outputs Enabled | 3 | |
| Supply Current, Outputs Disabled | ICC | 300 | 500 | μA | No Load, Pins 2, 3, 4 = 0V or 5V Outputs Disabled | 3 | |
| Driver Short-Circuit Current, VOUT = HIGH | IOSD1 | 35 | 100 | 250 | mA | VO = -7V | 3 |
| Driver Short-Circuit Current, VOUT = LOW | IOSD2 | 35 | 100 | 250 | mA | VO = 10V | 3 |
| Receiver Short-Circuit Current | IOSR | 7 | 85 | mA | 0V ≤ VO ≤ VCC | 3 | |
| Driver Input to Output (tPLH) | tPLH | 10 | 30 | 50 | ns | RDIFF = 54Ω, CL1 = CL2 = 100pF, (Figures 3 and 5) | 3 |
| Driver Input to Output (tPHL) | tPHL | 10 | 30 | 50 | ns | RDIFF = 54Ω, CL1 = CL2 = 100pF, (Figures 3 and 5) | 3 |
| Driver Output to Output Skew | tSKEW | 5 | 10 | ns | 3 | ||
| Driver Rise or Fall Time | tr, tf | 3 | 15 | 25 | ns | 3 | |
| Driver Enable to Output High | tZH | 40 | 70 | ns | CL = 100pF (Figures 4 and 6) S2 Closed | 3 | |
| Driver Enable to Output Low | tZL | 40 | 70 | ns | CL = 100pF (Figures 4 and 6) S1 Closed | 3 | |
| Driver Disable Time from Low | tLZ | 40 | 70 | ns | CL = 15pF (Figures 4 and 6) S1 Closed | 3 | |
| Driver Disable Time from High | tHZ | 40 | 70 | ns | CL = 15pF (Figures 4 and 6) S2 Closed | 3 | |
| Receiver Input to Output (tPLH) | tPLH | 30 | 90 | 200 | ns | RDIFF = 54Ω, CL1 = CL2 = 100pF, (Figures 3 and 7) | 3 |
| Receiver Input to Output (tPHL) | tPHL | 30 | 90 | 200 | ns | RDIFF = 54Ω, CL1 = CL2 = 100pF, (Figures 3 and 7) | 3 |
| Differential Receiver Skew | tSKD | 13 | ns | /tPLH, tPHL/ | 3 | ||
| Receiver Enable to Output Low | tZL | 20 | 50 | ns | CRL = 15pF (Figures 2 and 8) S1 Closed | 3 | |
| Receiver Enable to Output High | tZH | 20 | 50 | ns | CRL = 15pF (Figures 2 and 8) S2 Closed | 3 | |
| Receiver Disable from Low | tLZ | 20 | 50 | ns | CRL = 15pF (Figures 2 and 8) S1 Closed | 3 | |
| Receiver Disable from High | tHZ | 20 | 50 | ns | CRL = 15pF (Figures 2 and 8) S2 Closed | 3 | |
| Input High Voltage | VIH | 2 | V | DE, DI, RE | 3 | ||
| Input Low Voltage | VIL | 0.8 | V | DE, DI, RE | 3 | ||
| Input Current | IIN1 | -2 | 2 | μA | DE, DI, RE | 3 | |
| Input Current (A, B), C-, I-Grade | IIN2 | 1 | mA | DE = 0, VCC = 0V or 5.25V, VIN = 12V | 3 | ||
| Input Current (A, B), C-, I-Grade | IIN2 | -0.8 | mA | DE = 0, VCC = 0V or 5.25V, VIN = -7V | 3 | ||
| Differential Input Threshold Voltage for Receiver | VTH | -0.2 | 0.2 | V | -7V ≤ VCM ≤ 12V | 3 | |
| Receiver Output High Voltage | VOH | 3.5 | V | IO = -4mA, VID = 200mV | 3 | ||
| Receiver Output Low Voltage | VOL | 0.4 | V | IO = 4mA, VID = -200mV | 3 | ||
| Three-State (High Impedance) Output Current at Receiver | IOZR | -1 | 1 | μA | VCC = Max, 0.4V ≤ VO ≤ 2.4V | 3 | |
| Receiver Input Resistance (C-, I-Grade) | RIN | 12 | kΩ | -7V ≤ VCM ≤ 12V (C-, I-Grade) | 3 | ||
| Supply Voltage | 12 | V | 2 | ||||
| Control Input Voltages | -0.5 | V | Maximum printed as VCC + 0.5V | 2 | |||
| Driver Input Voltage | -0.5 | V | Maximum printed as VCC + 0.5V | 2 | |||
| Driver Output Voltage | -14 | 14 | V | 2 | |||
| Receiver Input Voltage | -14 | 14 | V | 2 | |||
| Receiver Output Voltages | -0.5 | V | Maximum printed as VCC + 0.5V | 2 | |||
| Lead Temperature (Soldering) | 300 | °C | Soldering, 10 sec | 2 | |||
| Storage Temperature Range | -65 | 150 | °C | 2 | |||
| Operating Temperature Range (LTC485C) | TA | 0 | 70 | °C | Commercial grade, LTC485CS8#TRPBF | 2 | |
| Positive Supply Voltage (VCC) | VCC | 4.75 | 5.25 | V | Pin 8 positive supply; VCC = 5V ±5% | 5 | |
| Maximum Junction Temperature (S package) | TJMAX | 150 | °C | S (SOIC) package | 2 | ||
| Thermal Resistance, Junction to Ambient (S package) | θJA | 150 | °C/W | S (SOIC) package | 2 | ||
| Differential Input Hysteresis (Receiver Input Hysteresis) | ΔVTH | 70 | mV | VCM = 0V | 3 |
Materials and finish
As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | tin | NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE (1.143, 1.651) OR TIN PLATE LEADS | 11 |
CAD (KiCad official)
- Symbol:
LTC485CS8#TRPBF - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
ltc485cs8-trpbf-etched.step/ltc485cs8-trpbf-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ltc485cs8-trpbf.step/ltc485cs8-trpbf.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Analog Devices datasheet (14 pp, sha256
fb75b8732f524069, retrieved 2026-10-19, 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).