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ADM1491EBRZ-REEL7

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Analog Devices RS-485 / RS-422 ICs, SOIC-14. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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ADM1491EBRZ-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.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); adm1491ebrz-reel7.step / adm1491ebrz-reel7.glb are 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, primary claude-haiku-5-5 (text), consensus claude-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).

Datasheet PDF