TS555 CMOS Timer: Datasheet, Application, Schematic

TS555 Symbol

TS555 Footprint

TS555 3D Model

The TS555 is a single CMOS timer which offers very low consumption (Icc(TYP) TS555 = 110µA at VCC=+5V versus Icc(TYP) NE555 = 3mA) and high frequency ff(max.) TS555 = 2.7MHz versus f(max.) NE555 = 0.1 MHz) Thus, either in Monostable or Astable mode, timing remains very accurate.

The TS555 provides reduced supply current spikes during output transitions, which enables the use of lower decoupling capacitors compared to those required by bipolar NE555. Timing capacitors can also be minimized due to high input impedance (1012Ω).

STMicroelectronics TS555IPT technical specifications, attributes, parameters and parts with similar specifications to STMicroelectronics TS555IPT.

• Very low power consumption: 110 µA typ at VCC 90 µa typ at VCC 3 V

• High maximum astable frequency of 2.7 MHz

• Pin-to-pin functionally-compatible with bipolar NE555

• Wide voltage range: +16 V

• Supply current spikes reduced during output transitions

• Output compatible with TTL, CMOS and logic MOS

Timing remains accurate in both monostable and astable modes.

In the monostable mode, the timer operates like a one-shot generator. Referring to the circuit below, the external capacitor is initially held discharged by a transistor inside the timer.

TS555 Monostable Operation

When the circuit is connected as shown below (pin 2 and 6 connected) it triggers itself and free runs as a multivibrator. The external capacitor charges through RA and RB and discharges through RB only. Thus the duty cycle may be precisely set by the ratio of these two resistors. 

In the astable mode of operation, C charges and discharges between 1/3 VCC and 2/3 VCC. As in the triggered mode, the charge and discharge times and therefore frequency, are independent of the supply voltage.

TS555 Astable Operation

TS555 Block Diagram

TS555 Package

TS555 Dimensions

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Download datasheets and manufacturer documentation for STMicroelectronics TS555IPT.