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ADM1491EBRZ-REEL7
Public Made by Adomby adom
Analog Devices RS-485 / RS-422 ICs, SOIC-14. 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
markdownADM1491EBRZ-REEL7
Analog Devices · RS-485 / RS-422 ICs · SOIC-14
ADM1491EBRZ-REEL7 from Analog Devices, in a SOIC-14. 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 | NC | unconnected | No connect; do not connect to this pin. |
| 2 | RO | output | Receiver output. |
| 3 | RE | input | Receiver output enable; a low level enables the receiver output, and a high level places the receiver output in a high impedance state. |
| 4 | DE | input | Driver output enable; a logic high enables the differential driver outputs, and a logic low places them in a high impedance state. |
| 5 | DI | input | Driver input; when the driver is enabled, a logic low forces Y low and Z high, and a logic high forces Y high and Z low. |
| 6 | GND | power_in | Ground. |
| 7 | GND | power_in | Ground; this pin is not connected internally and is shown as GND only to comply with the industry-standard pinout. |
| 8 | NC | unconnected | No connect; do not connect to this pin. |
| 9 | Y | output | Noninverting driver output Y. |
| 10 | Z | output | Inverting driver output Z. |
| 11 | B | input | Inverting receiver input B; common-mode range is −7 V to +12 V. |
| 12 | A | input | Noninverting receiver input A; common-mode range is −7 V to +12 V. |
| 13 | VCC | power_in | Power supply, 5 V ±5%. |
| 14 | VCC | power_in | Power supply, 5 V ±5%; this pin is not connected internally and is shown as VCC only to comply with the industry-standard pinout. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | SOIC-14 |
| Category | Interface |
| Pins | 14 |
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 Output Voltage, Loaded (RS-422 load) | /VOD2/ | 2 | 5 | V | RL = 100 Ω (RS-422), see Figure 21 | 3 | |
| Differential Output Voltage, Loaded (RS-485 load) | /VOD2/ | 1.5 | 5 | V | RL = 54 Ω (RS-485), see Figure 21 | 3 | |
| Differential Output Voltage, Loaded, common-mode range | /VOD3/ | 1.5 | 5 | V | −7 V ≤ VTEST ≤ +12 V, see Figure 22 | 3 | |
| Output Leakage Current (Y, Z) | IO | 100 | µA | DE = 0 V, VDD = 0 V or 5 V, VIN = 12 V | 3 | ||
| Output Leakage Current (Y, Z) | IO | -100 | µA | DE = 0 V, VDD = 0 V or 5 V, VIN = −7 V | 3 | ||
| Output Short-Circuit Current | IOS | 250 | mA | −7 V < VOUT < +12 V | 3 | ||
| Input Low Voltage | VIL | 0.8 | V | DE, RE, DI | 3 | ||
| Input High Voltage | VIH | 2 | V | DE, RE, DI | 3 | ||
| Input Current | II | -1 | 1 | µA | DE, RE, DI | 3 | |
| Differential Input Threshold Voltage | VTH | -0.2 | 0.2 | V | −7 V < VCM < +12 V | 3 | |
| Input Current (A, B) | II | 1 | mA | VCM = 12 V | 3 | ||
| Input Current (A, B) | II | -0.8 | mA | VCM = −7 V | 3 | ||
| Line Input Resistance | RIN | 12 | 30 | kΩ | −7 V ≤ VCM ≤ +12 V | 3 | |
| Output Voltage Low | VOL | 0.4 | V | IOUT = +4.0 mA, VA − VB = −0.2 V | 3 | ||
| Output Voltage High | VOH | 4 | V | IOUT = −4.0 mA, VA − VB = +0.2 V | 3 | ||
| Three-State Output Leakage Current | IOZR | -1 | 1 | µA | VCC = 5.25 V, 0.4 V < VOUT < 2.4 V | 3 | |
| Short-Circuit Current (receiver logic output) | 85 | mA | 3 | ||||
| ∆/VOD2/ for Complementary Output States | ∆/VOD2/ | 0.2 | V | RL = 54 Ω or 100 Ω, see Figure 21 | 3 | ||
| ∆/VOC/ for Complementary Output States | ∆/VOC/ | 0.2 | V | RL = 54 Ω or 100 Ω, see Figure 21 | 3 | ||
| Common-Mode Output Voltage | VOC | 3 | V | RL = 54 Ω or 100 Ω, see Figure 21 | 3 | ||
| Supply Current, Outputs Enabled | ICC1 | 1.2 | 2 | mA | Outputs unloaded, digital inputs = VCC or GND | 3 | |
| Supply Current, Outputs Disabled | ICC2 | 0.8 | 1.5 | mA | Outputs unloaded, digital inputs = VCC or GND | 3 | |
| Driver Propagation Delay | tDPLH, tDPHL | 11 | 17 | ns | RL = 54 Ω, CL = 100 pF, see Figure 23 and Figure 3 | 4 | |
| Driver Output Skew | tSKEW | 0.5 | 2 | ns | RL = 54 Ω, CL = 100 pF, see Figure 23 and Figure 3, tSKEW = /tDPLH − tDPHL/ | 4 | |
| Rise Time/Fall Time | tDR, tDF | 8 | 15 | ns | RL = 54 Ω, CL = 100 pF, see Figure 23 and Figure 3 | 4 | |
| Driver Enable Time | tZH, tZL | 20 | ns | RL = 110 Ω, CL = 50 pF, see Figure 24 and Figure 5 | 4 | ||
| Driver Disable Time | tHZ, tLZ | 20 | ns | RL = 110 Ω, CL = 50 pF, see Figure 24 and Figure 5 | 4 | ||
| Receiver Propagation Delay | tPLH, tPHL | 12 | 20 | ns | CL = 15 pF, see Figure 25 and Figure 4 | 4 | |
| Receiver Skew | tSKEW | 0.4 | 2 | ns | CL = 15 pF, see Figure 25 and Figure 4 | 4 | |
| Receiver Enable Time | tZH, tZL | 13 | ns | RL = 1 kΩ, CL = 15 pF, see Figure 26 and Figure 6 | 4 | ||
| Receiver Disable Time | tHZ, tLZ | 13 | ns | RL = 1 kΩ, CL = 15 pF, see Figure 26 and Figure 6 | 4 | ||
| Maximum Data Rate | 16 | Mbps | 4 | ||||
| Input Voltage Hysteresis | VHYS | 30 | mV | VCM = 0 V | 3 | ||
| VCC to GND | VCC | -0.3 | 7 | V | 5 | ||
| Digital I/O Voltage (DE, RE) | -0.3 | V | 5 | ||||
| Driver Input Voltage (DI) | -0.3 | V | 5 | ||||
| Receiver Output Voltage (RO) | -0.3 | V | 5 | ||||
| Driver Output/Receiver Input Voltage (A, B, Y, Z) | -9 | 14 | V | 5 | |||
| ESD (HBM) on A, B, Y, and Z | -8 | 8 | kV | Human body model | 5 | ||
| Storage Temperature Range | -55 | 150 | °C | 5 | |||
| Operating Temperature Range | -40 | 85 | °C | 5 | |||
| Supply Voltage (5 V ± 5%) | VCC | 4.75 | 5.25 | V | Recommended operation range; all min/max specifications apply over this range | 3 | |
| Thermal Resistance, junction-to-ambient, 14-lead SOIC | θJA | 86 | °C/W | Worst-case conditions, device soldered in circuit board for surface-mount packages | 5 |
CAD (KiCad official)
- Symbol:
ADM1491EBRZ-REEL7 - Footprint:
Package_SO:SOIC-14_3.9x8.7mm_P1.27mm - 3D model: SOIC-14 (KiCad packages3D, STEP)
- 3D model files:
adm1491ebrz-reel7-etched.step/adm1491ebrz-reel7-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);adm1491ebrz-reel7.step/adm1491ebrz-reel7.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Analog Devices datasheet (16 pp, sha256
74a5d8439f987121, retrieved 2026-10-17, 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).