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HT7555CNZ

Public Made by Adom

by adom

HTCSEMI Timers / Counters, DIP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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Contents

README

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HT7555CNZ

HTCSEMI · Timers / Counters · DIP-8

HT7555CNZ from HTCSEMI, in a DIP-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 GND power_in Ground reference for the timer; input voltages must stay between GND -0.3V and V+ +0.3V, and the datasheet notes that exceeding these limits may cause destructive latch-up.
2 TRIGGER input Negative-going trigger input that sets the internal flip-flop when it falls below 1/3 V+ (28 to 36% of VDD at 15V), with trigger current of 50 nA maximum at VDD = 15V.
3 OUTPUT output Timer output from a CMOS inverter driver that can drive TTL or CMOS loads, with an absolute maximum output current of 100 mA.
4 RESET input Active-low reset input that controls only the internal flip-flop and overrides all other inputs, with reset current of 50 nA maximum at VDD = 15V.
5 CONTROL VOLTAGE passive Control voltage terminal that sets the threshold and trigger comparator trip points (about 67% of VDD at 15V) and does not require decoupling for stable operation.
6 THRESHOLD input Threshold comparator input that resets the flip-flop when the voltage rises above 2/3 V+, with threshold current of 50 nA maximum at VDD = 15V.
7 DISCHARGE output Discharge switch to GND that is on while the output is low, with discharge leakage of 50 nA maximum at VDD = 15V.
8 VDD power_in Positive supply pin with a guaranteed functional supply range of 2.0 V to 18.0 V and an absolute maximum of +18 V.

Key specifications

Parameter Value
Manufacturer HTCSEMI
Package DIP-8
Category Clock/Timing
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 (absolute maximum) 18 V 2
Output Current 100 mA 2
Maximum Junction Temperature (Plastic Package) 150 °C Plastic package 2
Maximum Storage Temperature Range -65 150 °C 2
Supply Voltage Functional Operation VDD 2 18 V Functional operation, TA = +25°C 3
Static Supply Current (HT7555C) IDD 40 200 µA VDD = 5V, TA = +25°C 2
Static Supply Current (HT7555C) IDD 60 300 µA VDD = 15V, TA = +25°C 2
Monostable Timing Accuracy 2 % RA = 10k, C = 0.1µF, VDD = 5V 2
Monostable Timing (printed time values) 858 1161 µs RA = 10k, C = 0.1µF, VDD = 5V, TA = +25°C 2
Astable Timing Accuracy 2 % RA = RB = 10k, C = 0.1µF, VDD = 5V 2
Astable Timing (printed time values) 1717 2323 µs RA = RB = 10k, C = 0.1µF, VDD = 5V, TA = +25°C 2
Drift with Supply (monostable) 0.5 %/V VDD = 5V to 15V 2
Drift with Supply (astable) 0.5 %/V VDD = 5V to 15V 2
Threshold Voltage VTH 62 67 71 % VDD VDD = 15V, TA = +25°C 2
Trigger Voltage VTRIG 28 32 36 % VDD VDD = 15V, TA = +25°C 2
Control Voltage VCV 62 67 71 % VDD VDD = 15V, TA = +25°C 2
Reset Voltage VRST 0.4 1 V VDD = 2V to 15V, TA = +25°C 3
Trigger Current ITRIG 10 50 nA VDD = 15V 2
Threshold Current ITH 10 50 nA VDD = 15V 2
Reset Current IRST 10 50 nA VDD = 15V 3
Discharge Leakage Current IDIS 10 50 nA VDD = 15V 3
Output Voltage Low VOL 0.4 1 V VDD = 15V, ISINK = 20mA, TA = +25°C 3
Output Voltage Low VOL 0.2 0.4 V VDD = 5V, ISINK = 3.2mA, TA = +25°C 3
Output Voltage High VOH 14.3 14.6 V VDD = 15V, ISOURCE = 0.8mA, TA = +25°C 3
Output Voltage High VOH 4 4.3 V VDD = 5V, ISOURCE = 0.8mA, TA = +25°C 3
Discharge Output Voltage VDIS 0.2 0.4 V VDD = 5V, ISINK = 15mA, TA = +25°C 3
Discharge Output Voltage VDIS 0.4 V VDD = 15V, ISINK = 15mA 3
Drift with Temperature (monostable) 150 ppm/°C VDD = 5V 2
Drift with Temperature (monostable) 200 ppm/°C VDD = 10V 2
Drift with Temperature (monostable) 250 ppm/°C VDD = 15V 2
Drift with Temperature (astable) 150 ppm/°C VDD = 5V 2
Drift with Temperature (astable) 200 ppm/°C VDD = 10V 2
Drift with Temperature (astable) 250 ppm/°C VDD = 15V 2
Output Rise Time tR 75 ns RL = 10MΩ, CL = 10pF, VDD = 5V 3
Output Fall Time tF 75 ns RL = 10MΩ, CL = 10pF, VDD = 5V 3
Oscillator Frequency fMAX 1 MHz VDD = 5V, RA = 470Ω, RB = 270Ω, C = 200pF 3
Thermal Resistance Junction-to-Ambient (8 Ld PDIP) θJA 130 °C/W Typical; measured in free air on low thermal conductivity test board 2
Thermal Resistance Junction-to-Case (8 Ld PDIP) θJC 69 °C/W Typical; case temp at package top center 2

CAD (KiCad official)

  • Symbol: HT7555CNZ
  • Footprint: Package_DIP:DIP-8_W7.62mm
  • 3D model: DIP-8 (KiCad packages3D, STEP)
  • 3D model files: ht7555cnz-etched.step / ht7555cnz-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ht7555cnz.step / ht7555cnz.glb are the bare package body.

Provenance

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

  • Datasheet: HTCSEMI datasheet (10 pp, sha256 90e64792df0537cc, retrieved 2026-10-15, 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