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GM491E

Public Made by Adom

by adom

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

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GM491E

GATEMODE · RS-485 / RS-422 ICs · SOP-14

GM491E from GATEMODE, in a SOP-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 N.C. unconnected No connect pin; not internally connected.
2 RO output Receiver output: RO goes high if A is more than 200mV above B and goes low if A is more than 200mV below B.
3 RE input Receiver output enable: RO is enabled when RE is low and is high impedance when RE is high.
4 DE input Driver output enable: the driver outputs Y and Z are enabled when DE is high and are high impedance when DE is low.
5 DI input Driver input: a low on DI forces Y low and Z high, and a high on DI forces Y high and Z low.
6 GND power_in Ground reference; all voltages are referenced to device ground unless otherwise specified.
7 GND power_in Ground reference; all voltages are referenced to device ground unless otherwise specified.
8 N.C. unconnected No connect pin; not internally connected.
9 Y output Non-inverting driver output, enabled by DE high and high impedance when DE is low.
10 Z output Inverting driver output, enabled by DE high and high impedance when DE is low.
11 B input Inverting receiver input.
12 A input Non-inverting receiver input.
13 N.C. unconnected No connect pin; not internally connected.
14 VCC power_in Positive supply, specified at 4.75V ≤ VCC ≤ 5.25V; the datasheet recommends bypassing VCC with 0.1µF.

Key specifications

Parameter Value
Manufacturer GATEMODE
Package SOP-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
VCC Supply Voltage VCC 6.5 V 2
RE, DE Control Input Voltage RE, DE -0.5 V 2
DI Driver Input Voltage DI -0.5 V 2
A, B Driver Output Voltage A, B -8 13 V 2
A, B Receiver Input Voltage A, B -8 13 V 2
RO Receiver Output Voltage RO -0.5 V 2
Storage Temperature Range -65 160 °C 2
Positive Supply Voltage (pin description) VCC 4.75 5.25 V 5
Operation Temperature Range -40 85 °C Order information operation temperature range 14
Differential Driver Output (with load, RS-422) VOD2 2 V R = 50Ω (RS-422) 2
Differential Driver Output (with load, RS-485) VOD2 1.5 5 V R = 27Ω (RS-485), Figure 4 2
Input High Voltage VIH 2 V DE, DI, RE 2
Input Low Voltage VIL 0.8 V DE, DI, RE 2
Input Current IIN1 -2 2 µA DE, DI, RE, VCC floating 2
Input Current (A, B) at VIN = 12V IIN2 1 mA DE = 0V; VCC = 0V or 5.25V; VIN = 12V 2
Input Current (A, B) at VIN = -7V IIN2 -0.8 mA DE = 0V; VCC = 0V or 5.25V; VIN = -7V 2
Receiver Differential Threshold Voltage △VTH -0.2 0.2 V -7V≤VCM≤12V 2
Receiver Output High Voltage VOH 3.5 V IO = -4mA, VID = 200mV 2
Receiver Output Low Voltage VOL 0.4 V IO = 4mA, VID = -200mV 2
Three-State (high impedance) Output Current at Receiver IOZR -1 1 µA 0.4V ≤ VO ≤ 2.4V 3
No-Load Supply Current (GM490E/GM491E) ICC 500 600 µA DE, DI, RE = 0V or VCC 3
Driver Short-Circuit Current, VO = High IOSD1 35 250 mA -7V≤VCM≤12V (Note 4) 3
Driver Short-Circuit Current, VO = Low IOSD2 35 250 mA -7V≤VCM≤12V (Note 4) 3
Receiver Short-Circuit Current IOSR 7 100 mA 0V ≤ VO ≤ VCC 3
Driver Input to Output (tPLH) tPLH 10 30 60 ns Figure 6 and 8, RDIFF = 54Ω, CL1 = CL2 = 100pF 3
Driver Input to Output (tPHL) tPHL 10 30 60 ns Figure 6 and 8, RDIFF = 54Ω, CL1 = CL2 = 100pF 3
Driver Output Skew to Output tSKEW 5 10 ns Figure 6 and 8, RDIFF = 54Ω, CL1 = CL2 = 100pF 3
Driver Rise or Fall Time (row 1 of 2, GM490E/GM491E) tR, tF 5 15 25 ns Figure 6 and 8, RDIFF= 54Ω, CL1 =CL2 = 100pF 3
Driver Rise or Fall Time (row 2 of 2, GM490E/GM491E) tR, tF 3 15 40 ns Figure 6 and 8, RDIFF= 54Ω, CL1 =CL2 = 100pF 3
Driver Enable to Output High tZH 40 70 ns Figure 7 and 9, CL = 100pF, S2 closed 3
Driver Enable to Output Low tZL 40 70 ns Figure 7 and 9, CL = 100pF, S1 closed 3
Driver Disable Time from Low tLZ 40 70 ns Figure 7 and 9, CL = 15pF, S1 closed 3
Driver Disable Time from High tHZ 40 70 ns Figure 7 and 9, CL = 15pF, S2 closed 3
Receiver Input to Output (row 1 of 2, GM490E/GM491E) tPLH, tPHL 20 90 150 ns Figure 6 and 10, RDIFF = 54Ω, CL1=CL2=100pF 3
Receiver Input to Output (row 2 of 2, GM490E/GM491E) tPLH, tPHL 20 90 200 ns Figure 6 and 10, RDIFF = 54Ω, CL1=CL2=100pF 3
Receiver Enable to Output Low tZL 20 50 ns Figure 5 and 11, CRL = 15pF, S1 closed 3
Receiver Enable to Output High tZH 20 50 ns Figure 5 and 11, CRL = 15pF, S2 closed 4
Receiver Disable Time from Low tLZ 20 50 ns Figure 5 and 11, CRL = 15pF, S1 closed 4
Receiver Disable Time from High tHZ 20 50 ns Figure 5 and 11, CRL = 15pF, S2 closed 4
Maximum Data Rate fGM 2.5 Mbps 4

CAD (KiCad official)

  • Symbol: GM491E
  • Footprint: Package_SO:SOIC-14_3.9x8.7mm_P1.27mm
  • 3D model: SOP-14 (KiCad packages3D, STEP)
  • 3D model files: gm491e-etched.step / gm491e-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); gm491e.step / gm491e.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: GATEMODE datasheet (15 pp, sha256 ae94ab1d1fb63ab4, retrieved 2026-10-19, 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