TS555CN - 2.7MHz Low-Power CMOS Timer | STMicroelectronics
MPN: TS555CN ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
TS555CN Overview
A 555 timer is a programmable timing IC that combines a resistor, capacitor, and internal threshold comparator into a compact oscillator or one-shot pulse generator. The TS555CN belongs to the CMOS timer, oscillator, and clock-and-timing hierarchy: it can generate continuous periodic waveforms in astable mode or produce a timed output pulse in monostable mode. Its CMOS implementation is especially useful in low-power and higher-frequency circuits where lower supply current than a conventional bipolar NE555 is valuable.
Key features include very low typical supply current, a maximum astable frequency of 2.7 MHz, wide operating voltage support to 18 V, high input impedance, and output compatibility with TTL, CMOS, and logic families. According to the STMicroelectronics manufacturer datasheet, typical supply current is 110 µA at 5 V and 90 µA at 3 V, with reduced current spikes during output transitions. These characteristics make the device practical for portable timing, pulse generation, debouncing, and periodic-control applications.
Internally, the TS555CN uses CMOS circuitry to implement the comparator, flip-flop, discharge transistor, and timing-control functions of a standard 555 timer. In astable operation, two external resistors and one capacitor establish the oscillation period; in monostable operation, one resistor and one capacitor set the pulse width. The external timing elements determine practical accuracy, while the timer provides repeatable thresholding and state control.
Typical uses include low-power delay circuits, oscillator clocks, LED flashers, pulse generators, debounce networks, and control timing in embedded equipment. The TS555CN can also replace a standard NE555 where the circuit permits CMOS supply current and operating-voltage differences. Before substitution, verify trigger-level, output-drive, timing-tolerance, and maximum-frequency requirements against the actual design.
For PCB layout, keep the timing capacitor and resistor leads short, connect the decoupling capacitor close to VCC and GND, and avoid long traces around high-impedance threshold and control pins. Because the DIP package has exposed through-hole leads, mechanical spacing and soldering cleanliness should also be considered. This page combines manufacturer specifications, verified distributor information, replacement guidance, and practical design notes for engineering selection.
Drop-in alternatives for TS555CN — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with TS555CN (same form factor and footprint) — differing in Package, Mounting Type, Operating Modes, Number of Timers, Output Compatibility.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
NE555P
✅ Drop-In✓ In Stock
$0.34 / Unit
View Datasheet →TS555IN
✅ Drop-In📋 Reference alternative (not in catalog)
TS555ID
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →LMC555CN
✅ Drop-In📋 Reference alternative (not in catalog)
TS555CN Specifications
| Timer Type | Single CMOS timer |
| Maximum Astable Frequency | 2.7 MHz |
| Typical Supply Current at 5 V | 100 µA |
| Typical Supply Current at 3 V | 90 µA |
| Datasheet Family Typical Supply Current at 5 V | 110 µA |
| Operating Supply Voltage Range | 2 V to 18 V |
| Maximum Supply Voltage | 18 V |
| Input Impedance | 10^12 ohm |
| Output Compatibility | TTL, CMOS, and logic compatible |
| Compatibility | Pin-to-pin and functionally compatible with bipolar NE555 |
| Operating Modes | Astable and monostable |
| Supply Current Spikes | Reduced during output transitions |
| Number of Timers | 1 timer |
| Package | 8-pin DIP (0.300 inch, 7.62 mm pitch) |
| Mounting Type | Through-hole |
| RoHS Status | Details available on distributor product listing |
TS555CN Pin Configuration
| Pin 1 | GND — Ground |
| Pin 2 | TRIG — Trigger input |
| Pin 3 | OUT — Timer output |
| Pin 4 | RESET — Reset input |
| Pin 5 | CONT — Control voltage input |
| Pin 6 | THRESHOLD — Threshold input and timing capacitor connection |
| Pin 7 | DISCHARGE — Discharge transistor output and timing capacitor connection |
| Pin 8 | VCC — Power supply |
Typical Applications
TS555CN is suitable for 6 applications: Low-Power Astable Oscillator, Portable Timer and Delay Circuit, LED Flasher and Visual Indicator, Pulse Generator and Signal Conditioning, Switch Debounce and Retrigger Circuit, Industrial Periodic Control and Watchdog.
Low-Power Astable Oscillator
The TS555CN fits low-power oscillator requirements because its verified maximum astable frequency is 2.7 MHz and its typical supply current is 100 µA at 5 V. Use two timing resistors and one capacitor to establish oscillation, with the capacitor connected to the timing and discharge nodes. This provides much more frequency headroom than the cited 0.1 MHz NE555 limit while reducing static consumption. Near the upper frequency limit, minimize capacitor lead length and parasitic capacitance, and check output rise and fall times before treating the maximum rating as usable accuracy.
Recommended
Portable Timer and Delay Circuit
The TS555CN is appropriate for battery-powered delay and pulse-generation circuits because its typical supply current is 100 µA at 5 V, substantially below the cited 3 mA typical consumption of a bipolar NE555. In monostable mode, an external resistor and capacitor establish a one-shot pulse interval, while the trigger and reset inputs provide external control. Because CMOS input impedance can reach 10^12 ohm, keep timing-node leakage and board contamination in mind, especially for long delays where the capacitor and timing resistor dominate timing drift.
Recommended
LED Flasher and Visual Indicator
The TS555CN can drive a periodic LED flasher using its astable oscillator and output stage, with the flash rate set by external timing components. Its 2.7 MHz maximum frequency supports much faster timing than the conventional NE555, while low supply current benefits compact battery-powered indicators. The practical limit is often the LED and driver transistor rather than the timer. Select a transistor with adequate base current and saturation behavior, and account for output-current limits and timing tolerances if the visual flash rate must be precise.
Recommended
Pulse Generator and Signal Conditioning
The TS555CN is useful for generating repeatable, timed pulses in instrumentation, test fixtures, and control logic because the internal comparator and flip-flop support monostable operation. A resistor-capacitor network sets the pulse width, and the trigger input initiates the event. Compared with a software timer, the circuit can continue operating independently and react quickly. Design the output drive around the datasheet’s sink and source capabilities, use a suitable pull network for the logic family, and avoid treating the TS555CN as a general-purpose precision waveform amplifier.
Recommended
Switch Debounce and Retrigger Circuit
The TS555CN can be configured in monostable mode to suppress contact bounce and provide one clean output transition per user action. Its CMOS inputs offer high input impedance, and the low typical supply current supports compact control modules. The output pulse duration is controlled by external timing components, while the trigger network determines how mechanical or mechanical-style events are accepted. Set the pulse longer than the expected bounce interval, avoid retriggering if one action must produce only one event, and verify logic thresholds because CMOS and bipolar timer trigger behavior can differ.
Recommended
Industrial Periodic Control and Watchdog
The TS555CN can provide a periodic heartbeat or local timeout in industrial equipment because it operates in astable or monostable mode with a wide supply-voltage range up to 18 V. The high input impedance and reduced supply-current spikes during output transitions are useful when the timer interfaces with higher-impedance control circuitry. For safety-related supervision, do not rely solely on a free-running timer; verify reset behavior and use a supervisor or microcontroller watchdog where a stuck timer could allow continued operation after a fault.
Recommended
Recommended Products Summary
Engineering reference data for TS555CN — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | NE555P | TS555IN | TS555ID | LMC555CN |
|---|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | Maxim Integrated |
| Package | PDIP-8 | PDIP-8 - same | PDIP-8 - same | PDIP-8 - same | PDIP-8 - same |
| Timer Technology | Single CMOS timer | Bipolar 555 timer | Single CMOS timer | Low-energy CMOS timer | CMOS timer |
Key Differentiators
- Higher maximum astable frequency (vs NE555P)
- Lower typical supply consumption (vs NE555P)
- Wide supply-voltage capability (vs LMC555CN)
Design Notes
Place the timing resistor and capacitor connections directly beside pins 6 and 7, and minimize the trace area around the timing nodes. The TS555CN can operate up to 2.7 MHz, where lead and track inductance, input capacitance, and leakage begin to affect timing. Use a low-inductance ground return, avoid routing the timing network beside high-current switching nodes, and keep the VCC bypass capacitor close to pin 8 with a short ground path.
Use the low quiescent current of the TS555CN only after accounting for output-drive dissipation and external network loading. Estimated: with a 5 V supply and a 1 mA output load into a high-impedance load, the timer may draw approximately 5 mA plus the cited 100 µA typical internal supply current, before external component losses. Actual dissipation also depends on output voltage, load, duty cycle, and source/sink behavior. Use the manufacturer output-current limits and thermal data for the final design.
Do not substitute a bipolar NE555 solely because both devices use eight pins. Verify VCC range, trigger and reset thresholds, output high and low levels, sink and source current, discharge current, and maximum frequency. The verified comparison identifies NE555P as completely replaceable, but the TS555CN reaches 2.7 MHz while NE555P is listed at 500 kHz. Also avoid leaving the reset pin floating and follow the datasheet’s control-voltage guidance when that pin is used.
Keep the DIP timer away from high-temperature components and sources of conductive contamination because the TS555CN’s high input impedance can make threshold and timing inputs sensitive to leakage. Provide adequate lead spacing for hand soldering and avoid conductive debris beneath the package. For long monostable delays, account for capacitor dielectric leakage, tolerance, and surface leakage because the very high input impedance preserves rather than eliminates those timing errors.
Compliance Information
The supplied verified data indicates that RoHS details exist on the distributor listing, but it does not provide a definitive compliance statement. No separate REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification data was supplied.
