LM556CN - Dual Timer, 4.5-16V, 14-DIP | onsemi
MPN: LM556CN ✓ AktifLM556CN Ringkasan
A dual timer is a timing and oscillator IC that generates controlled time delays or periodic waveforms. Within the product hierarchy, the LM556CN belongs to the timer and oscillator class, the clock and timing category, and ultimately the broader semiconductor and integrated-circuit ecosystem. Its two timer sections can operate independently, making it useful when a design needs two related timing functions without allocating two separate packages.
Verified device features include operation in both astable and monostable modes, high output current with TTL compatibility, adjustable duty cycle, and temperature stability of 0.005% per degree Celsius. The specified supply range of 4.5 V to 16 V supports both conventional 5 V logic systems and higher-voltage industrial control environments. Many operating characteristics apply from 0°C to 70°C, as stated in the manufacturer datasheet.
Each internal timer includes threshold, trigger, output, reset, discharge, and control functions. In monostable mode, the circuit produces one timed pulse after a trigger event. In astable mode, it repeatedly charges and discharges an external timing capacitor and drives an output waveform. The output stage can sink and source relatively high current and remains TTL compatible, reducing the need for added output-driver circuitry in many applications.
Typical uses include industrial pulse and delay generation, LED and indicator flashing, periodic sampling triggers, simple clock or oscillator circuits, and two-channel debounce or delay systems. The DIP-14 package also supports through-hole insertion and replacement of two discrete 555 timers, although legacy DIP construction should be considered for new compact designs.
Designers should preserve the timing-capacitor and timing-resistor connections near the appropriate IC pins and account for temperature and supply sensitivity when setting long delays. Decoupling should minimize supply disturbances, while reset and trigger signals require suitable logic levels and clean transitions. Verify the exact pin functions and electrical limits in the manufacturer datasheet before layout or production use.
Alternatif penggantian untuk LM556CN — paket yang sama, pin-pada-pin kompatibel. Bagian paket yang berbeda memerlukan kerja ulang PCB diabaikan.
NE556N
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
LM556CN/NOPB
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
LM556CN Spesifikasi
| Device Type | Dual timer integrated circuit |
| Timer Configuration | 2 independent 555-compatible timer sections |
| Supply Voltage Range | 4.5 V to 16 V |
| Operating Modes | Astable and monostable |
| Timing Range | Microseconds to hours |
| Output Compatibility | TTL compatible |
| Duty Cycle | Adjustable |
| Temperature Stability | 0.005% per degree Celsius |
| Commercial Operating Temperature Range | 0°C to 70°C |
| Jumlah Pin | 14 pins |
| Paket | 14-pin MDIP |
| Tipe Mounting | Through-hole |
| Timing Elements | External resistor and capacitor for each timing function |
| Reset Function | Active-low reset on each timer section |
Konfigurasi Pin LM556CN
| Pin produk 1 | GND — Ground for timer section 1 |
| Pin produk 2 | TRIGGER — Trigger input for timer section 1 |
| Pin produk 3 | OUTPUT — Output for timer section 1 |
| Pin produk 4 | RESET — Reset input for timer section 1 |
| Pin produk 5 | CONTROL — Timing control input for timer section 1 |
| Pin produk 6 | THRESHOLD — Threshold input for timer section 1 |
| Pin produk 7 | DISCHARGE — Discharge output for timer section 1 |
| Pin produk 8 | TRIGGER — Trigger input for timer section 2 |
| Pin produk 9 | OUTPUT — Output for timer section 2 |
| Pin produk 10 | RESET — Reset input for timer section 2 |
| Pin produk 11 | CONTROL — Timing control input for timer section 2 |
| Pin produk 12 | THRESHOLD — Threshold input for timer section 2 |
| Pin produk 13 | DISCHARGE — Discharge output for timer section 2 |
| Pin produk 14 | VCC — Positive supply connection |
Aplikasi Umum
LM556CN cocok untuk 6 aplikasis: Industrial Pulse and Delay Generation, LED Flashing and Indicator Control, Timing Reference and Clock Oscillator, Motor and Relay Timing Control, Sensor Debounce and Retiming, Audio and Communication Pulse Systems.
Industrial Pulse and Delay Generation
The LM556CN fits industrial pulse-generation and time-delay circuits because it combines two independent timer sections in one 14-pin DIP package. Each section can use an external resistor and capacitor for timing from microseconds to hours, while the verified 4.5 V to 16 V supply range covers both 5 V logic and higher-voltage control environments. In a monostable configuration, a trigger can initiate one controlled output pulse for relay actuation, actuator signaling, or sequential process timing. The second timer may provide a complementary delay or an independent event window. Designers should use high-stability timing components, account for the specified 0.005% per degree Celsius temperature stability, and keep the external timing network away from high-current switching paths.
Direkomendasikan
LED Flashing and Indicator Control
The LM556CN is useful for LED flashing, beacon indication, and periodic visual signaling because either timer can operate in astable mode with an adjustable duty cycle. The device's verified supply range of 4.5 V to 16 V allows it to operate from regulated low-voltage logic or a suitably protected higher-voltage rail. Its high output current and TTL-compatible output can simplify direct drive of suitable indicator circuits, although the exact output limits must be checked against the selected manufacturer datasheet. The second timer can create a second flash rate, delayed indication, or an alternating pattern without requiring another timer IC. Component selection should include LED current-limiting resistors and ensure that astable timing components remain electrically isolated from LED and relay-switching nodes to reduce noise coupling.
Direkomendasikan
Timing Reference and Clock Oscillator
The LM556CN can generate a repeatable clock or service-timing reference in astable mode, making it appropriate for low-frequency control and monitoring systems. The external resistor-capacitor network defines the oscillation period, and the verified timing capability extends from microseconds to hours. Because the IC contains two timer sections, one channel can create the primary cadence while the other derives a delayed, complementary, or divided timing reference. Its TTL-compatible output supports interfacing with conventional digital logic when the data sheet's output ratings are satisfied. Long-delay applications must consider resistor and capacitor tolerance, leakage, dielectric behavior, and temperature drift in addition to the published 0.005% per degree Celsius timing stability.
Direkomendasikan
Motor and Relay Timing Control
The LM556CN can provide adjustable on-delay, off-delay, and pulse-width control for relays, solenoids, and small motor-control stages. Monostable operation is appropriate for a one-shot actuator pulse, while astable operation can repeatedly cycle a load or establish a supervisory timeout. The dual timer architecture allows one channel to control the actuator and the other to monitor or sequence a related interval. The device's verified 4.5 V to 16 V range can support common industrial supply conditions, but the external driver must handle inductive current, flyback energy, and voltage transients. Keep the timer IC and timing components away from switching nodes, use a suitable suppression network on inductive loads, and verify every output and supply pin against the selected manufacturer's absolute-maximum ratings.
Direkomendasikan
Sensor Debounce and Retiming
The LM556CN can retime or debounce periodic sensor signals, creating clean timing windows from noisy or irregular transitions. One timer channel may establish a fixed pulse width, while the second provides a delayed or complementary output for validation. The verified 4.005% per degree Celsius temperature-stability statement applies to timing characteristics and must be distinguished from the much larger error that may result from external resistor and capacitor tolerances. For sensor interfaces, choose stable timing components and provide appropriate threshold conditioning before the trigger input. The DIP-14 package favors legacy through-hole instrumentation and controller boards, while new compact products may benefit from a modern surface-mount timer after confirming equivalent electrical and pinout behavior.
Direkomendasikan
Audio and Communication Pulse Systems
The LM556CN can generate periodic gating, timing, or synchronization pulses in communication and audio-adjacent control circuits. Astable mode provides a continuous waveform, while monostable mode creates a pulse after a valid trigger event; two channels can support separate frame timing or pulse-shaping tasks. The TTL-compatible output is valuable when interfacing to conventional digital logic, while the high-output-current feature can simplify drive stages within verified limits. For communication equipment, timing accuracy depends on the external network and board conditions, so low-leakage capacitors and stable resistors are important. Keep the 14-pin DIP timer physically separated from high-gain analog paths and switching regulators, and verify supply-noise sensitivity during prototyping.
Direkomendasikan
Ringkasan Produk Direkomendasikan
Data referensi engineering untuk LM556CN — pembandingan, panduan desain, dan informasi konformitas.
Panduan Pemilihan
Pembandingan dengan Alternatif
| Parameter Umum | Produk Ini | NE556N | LM556CN/NOPB |
|---|---|---|---|
| Package | DIP-14 | DIP-14 | DIP-14 |
| Brand | onsemi | Texas Instruments | Texas Instruments |
| Device Type | Dual timer integrated circuit | Dual timer integrated circuit | Dual timer integrated circuit |
| Timer Count | 2 | 2 | 2 |
| Operating Modes | Astable and monostable | Astable and monostable | Astable and monostable |
| Supply Voltage Range | 4.5 V to 16 V | 4.5 V to 16 V | 4.5 V to 16 V |
| Timing Range | Microseconds to hours | Microseconds to hours | Microseconds to hours |
| Temperature Stability | 0.005% per degree Celsius | 0.005% per degree Celsius | 0.005% per degree Celsius |
| Operating Temperature | 0°C to 70°C for many specified characteristics | 0°C to 70°C for many specified characteristics | 0°C to 70°C for many specified characteristics |
| Output Compatibility | TTL compatible | TTL compatible | TTL compatible |
| Mounting Type | Through-hole | Through-hole | Through-hole |
| Duty Cycle | Adjustable | Adjustable | Adjustable |
Diferensiator Kunci
- Two independent timing sections in one package (vsNE556N)
- Verified onsemi distributor source with explicit 14-MDIP identification (vsLM556CN/NOPB)
- Broad verified operating and timing capability (vsNE556N)
Catatan Desain
Place the timing resistor and capacitor as close as practical to the associated THRESHOLD, TRIGGER, and DISCHARGE pins. Long timing-node traces can pick up switching noise and increase trigger sensitivity. For long delays, use a low-leakage capacitor and stable resistor, and provide a nearby ground return. Because the timing network is external, component tolerance and temperature coefficient can dominate the LM556CN's stated 0.005% per degree Celsius temperature stability.
Decouple the VCC connection with a local bypass capacitor and route it directly to the power and ground pins. The verified operating range is 4.5 V to 16 V, so do not allow supply transients above the selected manufacturer's absolute-maximum rating. Keep inductive loads and their flyback networks physically separated from the timing components. Verify output source and sink limits before driving loads directly; the verified materials confirm a high-output-current, TTL-compatible output but do not provide the numerical current limits.
Do not assume that all LM556CN orderable versions are identical across manufacturer history. The target appears in onsemi, Fairchild, and National Semiconductor/TI-related sources, and suffix codes such as NOPB can identify a specific ordering configuration. Before substitution, verify the pinout, supply range, output current, reset polarity, temperature grade, package drawing, and lifecycle status from the datasheet of the actual manufacturer being purchased.
Maintain a clear keep-out around the timing nodes and avoid routing them beneath or directly beside high-current switching paths. The DIP-14 footprint allows convenient prototype replacement, but long leads can increase inductance and susceptibility to coupling. Where both timer sections are active, separate their timing components and outputs enough to prevent one channel's switching transitions from influencing the other channel's threshold or trigger signals.
Informasi Konformitas
The supplied manufacturer and distributor snippets do not explicitly state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is not applicable to the general-purpose LM556CN timer described by the verified data.
