component

ICM7555M

Public Unreviewed

by Ray

HGSEMI Timers / Clock Oscillators, SOP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

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Datasheet

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Contents

README

markdown

ICM7555M

HGSEMI · Timers / Clock Oscillators · SOP-8

ICM7555M from HGSEMI, in a SOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 GND power_in Ground reference for the device. Connect to the negative supply rail (0V).
2 TRIG input Trigger input. A negative-going pulse below 1/3 VDD initiates the timing cycle, setting the output high and starting the timing capacitor discharge sequence.
3 OUT output Timer output. CMOS push-pull output that swings from near GND to near VDD, capable of sourcing/sinking modest load currents.
4 RESET input Active-low reset input. Pulling this pin below approximately 0.7V forces the output low and resets the internal flip-flop regardless of trigger state. Tie to VDD if unused.
5 CV input Control Voltage input. Provides access to the internal 2/3 VDD reference node, allowing modulation of the threshold levels. Typically bypassed to GND with a 10nF capacitor when unused.
6 THRES input Threshold input. When the voltage on this pin rises above 2/3 VDD, the internal flip-flop resets, driving the output low and initiating capacitor discharge.
7 DISCH output Discharge output. Open-drain N-channel output used to discharge the external timing capacitor when the internal flip-flop is reset.
8 VDD power_in Positive supply voltage input. Operating range 2V to 18V.

Key specifications

Parameter Value
Manufacturer HGSEMI
Package SOP-8
Category RTC
Pins 8

Ordering variants

Same part, different packaging or reel option.

  • ICM7555MM

CAD (KiCad official)

  • Symbol: ICM7555M
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOP-8 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: HGSEMI datasheet (11 pp, sha256 e95f11bad730cc7b, retrieved 2026-08-17, 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: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF