ST TS556 Low-power Dual CMOS Timer Data Sheet
Summary
The TS556 is a highly efficient dual CMOS timer integrated circuit designed for precision timing applications. It offers robust performance with ultra-low power consumption and high frequency capability across a wide operating voltage range. This guide provides engineers with detailed electrical characteristics, functional parameters, and compatibility information—including simplified decoupling requirements—making it ideal for designing reliable digital circuits, replacing older models while boosting efficiency.
Page 1 Text Content
TS556
Low-power dual CMOS timer
Features Very low power consumption: µA typ at VCC = 5 µA typ at VCC = 3 High maximum astable frequency 2.7 MHz
DIP14
Pin-to-pin and functionally compatible with
(Plastic package)
bipolar NE556 Wide voltage range: 2 V to 16 Supply current spikes reduced during output transitions High input impedance: 1012 Output compatible with TTL, CMOS and logic
(Plastic micropackage)
Description The TS556 is a dual CMOS timer which offers a
very low consumption: Pin connections (Icc(TYP) TS556 = 220 µA at VCC +5 V versus (top view)
Icc(TYP) NE556 = 6 m A), and high frequency: (f(max.) TS556 = 2.7 MHz versus
Discharge +V
f(max.) NE556 = 0.1 MHz).
Threshold Discharge In both monostable and astable modes, timing Control
Threshold
Voltage
remains very accurate. Control
Reset
Voltage
The TS556 provides reduced supply current Output Reset
spikes during output transitions, which enable the Trigger
Output
use of lower decoupling capacitors compared to
GND Trigger
those required by bipolar NE556. Due to the high input impedance (1012Ω), timing capacitors can also be minimized.
October 2008 Rev 2 1/19
www.st.com
Page Summary Contents For ST TS556 Low-power Dual CMOS Timer Data Sheet
Manual Details
| Brand | Dual |
|---|---|
| Pages | 19 |
| File Size | 180.65 KB |
| Published | June 03, 2026 |
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Frequently Asked Questions
How does the TS556 compare to older timers like NE556 in terms of power usage?
The TS556 offers very low consumption, typically drawing 220 µA at V=5V CC, compared to the NE556's typical 6 mA.
Is the TS556 interchangeable with older timers like the NE556 for circuit design?
Yes, it is pin-to-pin and functionally compatible with the bipolar NE556 (plastic package).
What are the available operating temperature ranges for this device?
Temperature options include TS556C (0 to +70°C), TS556I (-40 to +125°C), or TS556M (-55 to +125°C).
How does the TS556 simplify circuit design over previous generations?
It reduces supply current spikes during output transitions, which enables the use of lower decoupling capacitors and minimizes capacitor size overall.