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MS2548

Public Made by Adom

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Hangzhou Ruimeng Tech RS-485 / RS-422 ICs, SOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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MS2548

Hangzhou Ruimeng Tech · RS-485 / RS-422 ICs · SOP-8

MS2548 from Hangzhou Ruimeng Tech, 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 R output Receiver output, which the datasheet describes as the receiver output pin (R) of the RS-485 receiver.
2 RE input Receiver enable: when high, the internal auto-direction circuit controls the receiver state; when low, the receiver is not controlled by auto-direction and its output level is set independently.
3 SHDN input Chip enable, active high: when SHDN is low the transmitter output is high impedance, and SHDN low puts the chip into low-power shutdown drawing less than 10 µA supply current.
4 D input Transmitter input: D low drives the bus low, and D high is held idle at high (driver shuts off once A-B exceeds VDT), so D should be held high when no data is sent.
5 GND power_in Ground reference for the device.
6 A bidirectional Bus line A (I/O), which requires external pull-up and pull-down resistors to keep the bus in a defined state.
7 B bidirectional Bus line B (I/O), which requires external pull-up and pull-down resistors to keep the bus in a defined state.
8 VCC power_in Supply pin; the recommended supply voltage range is 4.5 V to 5.5 V.

Key specifications

Parameter Value
Manufacturer Hangzhou Ruimeng Tech
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
Supply voltage VCC 4.5 5.5 V 4
Operating temperature range TA -40 125 °C 4
Junction temperature range TJ -40 150 °C 4
Supply voltage VCC -0.5 7 V 4
Bus voltage (A, B to GND) VBUS -7 12 V 4
Input voltage (D, SHDN, RE to GND) VLOGIC -0.3 5.7 V 4
Receiver output current IRO -30 30 mA 4
Soldering temperature (10 s) TSOLDERING 260 °C 10 s 4
Storage temperature Tstg -65 150 °C 4
ESD HBM, bus pins and GND ESD -4 4 kV HBM, 总线脚和地 4
ESD HBM, other pins ESD -3 3 kV HBM, 其他脚 4
Differential output voltage VOD 3.4 V RL=100Ω 5
Differential output voltage VOD 2.6 V RL=54Ω 5
Differential output voltage VOD 4.9 V 空载 5
Input high voltage (D, SHDN, RE) VIH 1.7 V 5
Input low voltage (D, SHDN, RE) VIL 1.6 V 5
Input current IIN 0.1 μA 5
Driver short-circuit output current IOSD 50 mA 0V≤VO≤+12V 5
Driver short-circuit output current IOSD -120 mA -7V≤VO≤0V 5
Driver short-circuit foldback output current IOSDF 20 mA (VCC-1V)≤VO≤+12V 5
Driver short-circuit foldback output current IOSDF -20 mA -7V≤VO≤0V 5
Bus input current IIA/B 210 μA D=1，VCC=0V 或 5V，VI=+12V 5
Bus input current IIA/B 160 μA D=1，VCC=0V 或 5V，VI=-7V 5
Output high voltage VOH 4.9 V IOH=-1.6mA, VA-VB > VTH 5
Output low voltage VOL 0.1 V IOL=1mA, VA-VB < VTH 5
Output high-impedance current IOZ 0.1 μA 0≤VO≤VCC 5
Quiescent supply current (no load) ICC 3.7 mA RE=0，SHDN=1，空载 5
Quiescent supply current (shutdown) ICC 2.3 mA SHDN=0 5
Differential output rise/fall time tF,tR 8.6 ns RL=110Ω, CL=50pF 6
Driver input to output propagation delay tPLH,tPHL 11 ns 6
Driver output level change time difference tSKEW 2 ns RL=110Ω, CL=50pF 6
Driver disable time (high-Z, to off) tPHZ, tPLZ 230 ns SHDN 切换电平 6
Driver enable time (from high-Z) tPZH, tPZL 1.5 μs 6
Maximum data rate (driver) DRDX 20 Mbps MS2548，速率=20Mbps 6
Driver shutdown delay tDDD 100 ns 6
Receiver input to output propagation delay tPLH,tPHL 52 ns CL=15pF 6
Receiver output level change time difference tSKEW 5 ns CL=15pF 6
Receiver disable time (RE switching) tPHZ,tPLZ 31 ns RE 切换 6
Receiver enable time (RE switching) tPZH,tPZL 10 ns RE 切换 6
Receiver disable time (SHDN switching) tPHZ,tPLZ 240 ns SHDN 切换 6
Receiver enable time (SHDN switching) tPZH,tPZL 1.4 us SHDN 切换 6
Maximum data rate (receiver) DRRX 20 Mbps 6
Receiver enable delay tRED 100 ns 6

CAD (KiCad official)

  • Symbol: MS2548
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOP-8 (KiCad packages3D, STEP)
  • 3D model files: ms2548-etched.step / ms2548-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ms2548.step / ms2548.glb are the bare package body.

Provenance

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

  • Datasheet: Hangzhou Ruimeng Tech datasheet (13 pp, sha256 c3b512251063476a, retrieved 2026-10-20, 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, 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