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TLC555IDR

CMOS 555 timer, 2.1MHz, 250uA at 5V, 2-15V supply, pin-compatible with NE555, SOIC-8

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Manufacturer Part：

TLC555IDR

Package：

SOIC-8 (3.91 x 4.9 x 1.58 mm)

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Description

Product Overview

The TLC555IDR from Texas Instruments is a CMOS version of the industry-standard 555 timer, offering significantly lower power consumption than the bipolar NE555 while maintaining pin compatibility. Operating from 2 V to 15 V with a typical supply current of 250 uA at 5 V, it supports astable and monostable timing up to 2.1 MHz in an SOIC-8 package, making it ideal for battery-powered timing and oscillator applications.

Key Specifications

Supply Voltage Range 2 V to 15 V
Max Frequency (Astable) 2.1 MHz
Supply Current (5V, typ) 250 uA
Output Sink Current 100 mA (typ)
Timing Accuracy 1% (typical)
Operating Temperature -40C to +85C

Features

  • CMOS implementation with 250 uA typical supply current at 5 V
  • Pin-compatible with NE555 for easy upgrade
  • High-frequency operation up to 2.1 MHz in astable mode
  • Wide supply voltage range from 2 V to 15 V
  • Rail-to-rail output swing with CMOS output stage

Applications

  • Precision timing and pulse generation in battery-powered devices
  • Monostable and astable multivibrator circuits
  • PWM modulation circuits
  • Clock and oscillator generation for digital systems
  • Time delay and sequential timing applications

The TLC555IDR is a CMOS precision timer from Texas Instruments that provides a direct pin-compatible replacement for the bipolar NE555 while consuming only a fraction of the supply current. At 5 V, the typical supply current is 250 uA compared to 3 mA for the NE555, making it ideal for battery-powered and low-power applications. The CMOS output stage provides rail-to-rail output swing and the device operates over a supply range of 2 V to 15 V. In astable mode, the TLC555 can operate at frequencies up to 2.1 MHz, significantly higher than the 100 kHz typical of bipolar 555 timers.

The TLC555IDR uses CMOS technology to implement the classic 555 timer architecture with three main functional blocks. (1) Voltage Divider: Three internal 100 kOhm resistors create two reference voltages at 1/3 VCC and 2/3 VCC for the internal comparators. (2) Comparator and Latch: The upper comparator (threshold pin) resets the internal flip-flop when voltage exceeds 2/3 VCC. The lower comparator (trigger pin) sets the flip-flop when voltage falls below 1/3 VCC. (3) Output Stage: A CMOS push-pull output provides rail-to-rail output swing with typical sink capability of 100 mA at 5 V.

Pin Name Type Function
1 GND Ground Ground reference
2 TRIGGER Input Starts timing when voltage falls below 1/3 VCC
3 OUTPUT Output Timer output (rail-to-rail CMOS)
4 RESET Input Active low reset
5 CONTROL VOLTAGE Input Access to 2/3 VCC reference (bypass with 0.01uF)
6 THRESHOLD Input Ends timing when voltage exceeds 2/3 VCC
7 DISCHARGE Output Open-drain discharge for timing capacitor
8 VCC Power Positive supply voltage (2-15V)
  • Battery-powered timing circuits with ultra-low quiescent current
  • Monostable time-delay circuits for power sequencing
  • Astable oscillator circuits up to 2.1 MHz for clock generation
  • PWM motor speed control and LED dimming
  • Capacitive sensor and touch interface timing circuits
Manufacturer Part Number Package Notes
Texas Instruments NE555DR SOIC-8 Bipolar 555, higher current
onsemi MC1455BDR2G SOIC-8 Bipolar 555 equivalent
STMicroelectronics TS555IDT SOIC-8 CMOS 555, 2.7-16V
Diodes Inc SA555DT SOIC-8 Bipolar, -40 to +85C
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