LM555CM - 100kHz Single Timer | Texas Instruments | 8-SOIC
部品番号: LM555CM ✓ 生産中LM555CM 概要
A 555 timer is an analog timing block containing voltage thresholds, comparators, a flip-flop, discharge control, and an output stage. In astable mode, the output repeatedly switches between two voltage levels and the external timing network determines both the charging and discharging intervals. In monostable mode, the circuit produces one timed output pulse after a trigger. This LM555CM combines that established function with TTL-compatible interfacing and output-current capability, making it suitable for conventional digital control and timing systems.
The verified operating range is 4.5 V to 16 V, and the listed maximum oscillator frequency is 100 kHz. The controller can source or sink up to 200 mA according to the manufacturer feature summary. Its timing-temperature stability is specified as 0.005%/°C, and the turn-off time is less than 2 µs. The SOIC-8 format permits conventional surface-mount assembly, while the available part information identifies the device as suitable for industrial control, pulse generation, delay, and oscillator implementations.
Technically, the LM555CM is controlled by an external RC timing network rather than a digital register or crystal. In astable operation, the timing capacitor charges and discharges through external resistors while the internal thresholds determine when the output changes state. Duty cycle is adjustable, although the exact permitted resistance and capacitance combinations depend on the manufacturer timing equations. Because this is a classic analog timer rather than a precision digital synthesizer, its accuracy depends on component tolerances, temperature, supply stability, and the timing network.
Typical uses include industrial pulse and delay circuits, LED flashers, debounce timers, basic clock generators, motor or relay timing, and laboratory test fixtures. The 200 mA output-drive capability can directly support compatible loads, while the 4.5 V minimum supply keeps the device compatible with common 5 V logic systems. The 16 V maximum rating also supports higher-voltage control designs when the surrounding circuit remains within the device ratings.
When laying out a LM555CM circuit, place the timing capacitor and timing resistors close to their associated pins and keep the control-node bypass capacitor connection short. Decouple the supply rail near the IC, avoid long current-loop paths, and verify that reset and trigger levels satisfy the input thresholds. The unused voltage and control pins should be connected according to the manufacturer guidance, and output loads must remain within the verified drive limits.
This product record combines verified manufacturer and distributor specifications, practical timer design guidance, package and pin information, and sourced drop-in alternatives. It is intended to help engineers identify the LM555CM quickly, compare equivalent SOIC-8 timers, and assess whether its 4.5 V to 16 V supply range and 100 kHz frequency capability fit the intended astable or monostable circuit.
ドロップイン代替品: LM555CM — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: LM555CM （同一形状・フットプリント） — 相違点: Supply Voltage Range, Timer Type.
SE555DR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
SE555D
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LMC555CM
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ICM7555IBAT
✅ ドロップイン📋 参考代替品（カタログ未掲載）
TS555ID
✅ ドロップイン価格はお問い合わせください
データシートを見る →LM555CM 仕様
| Timer Type | Single timer |
| Supported Operating Modes | Astable and monostable |
| Supply Voltage Range | 4.5 V to 16 V |
| Maximum Oscillator Frequency | 100 kHz |
| Timing Range | Microseconds to hours |
| Output Drive Capability | 200 mA |
| Duty Cycle | Adjustable |
| Temperature Stability | 0.005%/°C |
| Turn-Off Time | Less than 2 µs |
| Logic Compatibility | TTL compatible |
| パッケージ | 8-pin SOIC |
| 実装タイプ | Surface mount |
| Timing Elements | One external resistor and one capacitor in monostable operation |
| Output Function | Accurate timing pulse generation |
LM555CM ピン構成
| ピン 1 | GND — Ground reference |
| ピン 2 | TRIGGER — Trigger input |
| ピン 3 | OUTPUT — Timer output |
| ピン 4 | RESET — Reset input |
| ピン 5 | CONTROL — Timing-control voltage node |
| ピン 6 | VOLTAGE — Timing capacitor connection |
| ピン 7 | DISCHARGE — Discharge transistor output for the timing capacitor |
| ピン 8 | TRIGGER — Comparator trigger input |
主な用途
LM555CM の用途: 6 件s: Industrial Pulse and Delay Control, LED Flash and Beacon Driver, Basic Clock and Pulse Generator, Switch Debounce and Pulse Conditioning, Motor and Relay Timing, Test and Measurement Fixture Timing.
Industrial Pulse and Delay Control
The LM555CM fits industrial pulse-generation and delay circuits because it supports both astable and monostable operation from a 4.5 V to 16 V supply. In monostable mode, an external resistor and capacitor establish a delay extending from microseconds to hours, while the output delivers a defined timing pulse. The verified 200 mA drive capability can also operate suitable relay, lamp, or logic interfaces without an additional driver when their load and flyback requirements remain within the device limits.
おすすめ
LED Flash and Beacon Driver
LM555CM is suitable for LED flashers and warning indicators because astable mode repeatedly charges and discharges a timing capacitor and switches the output state. Its adjustable duty cycle supports different flash patterns, while the listed 100 kHz maximum frequency and less-than-2-µs turn-off time provide timing margin for faster indicator waveforms. The 4.5 V minimum supply is suitable for 5 V systems, although the LED current-limiting network and duty cycle must be designed around the verified 200 mA drive limit.
おすすめ
Basic Clock and Pulse Generator
As an astable oscillator, the LM555CM generates a repetitive waveform using external timing components and provides a useful reference clock for test fixtures, counter inputs, and control logic. The verified specification of 100 kHz maximum oscillator frequency defines the upper device class, while microsecond-to-hour timing capability covers much slower intervals. Actual frequency and duty cycle depend on resistor and capacitor tolerances, so precision applications require component selection and temperature-error analysis beyond the IC specification.
おすすめ
Switch Debounce and Pulse Conditioning
LM555CM can condition noisy or mechanically unstable switch events into a clean, fixed-duration pulse by operating in monostable mode. The trigger path accepts the input event, and the external timing network determines how long the output remains in its asserted state. This arrangement is useful for relay activation, counter isolation, and preventing repeated contacts from appearing as multiple commands. The control and bypass requirements around the timing pins should follow the manufacturer application guidance to maintain repeatability.
おすすめ
Motor and Relay Timing
The LM555CM provides a simple way to impose a defined operating interval on motors, relays, solenoids, or valves when their drive current and inductive transients are compatible with the output stage. Its 200 mA output-drive capability and adjustable duty cycle make it useful for short activation pulses and periodic sequencing. The design must limit load current to the verified drive capability and add appropriate suppression across inductive windings so that switching transients do not exceed the device's 16 V maximum supply condition.
おすすめ
Test and Measurement Fixture Timing
LM555CM is useful in test fixtures that need a repeatable trigger delay, pulse width, or repetitive excitation without relying on a complex digital subsystem. The part supports timing from microseconds to hours and can operate in both astable and monostable configurations. The listed 100 kHz frequency class enables fast repetitive stimulus, although output rise and fall behavior at the selected load should be checked in the actual fixture. A 4.5 V to 16 V supply range also allows integration with common laboratory control voltages.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: LM555CM — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | SE555DR | SE555D | LMC555CM | ICM7555IBAT | TS555ID |
|---|---|---|---|---|---|---|
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Brand | Texas Instruments | STMicroelectronics | onsemi | Texas Instruments | onsemi | STMicroelectronics |
| Timer Configuration | Single 555 timer | Single timer | Single timer | Single CMOS timer | Single CMOS timer | Single timer |
| Operating Modes | Astable and monostable | Astable and monostable | Astable and monostable | Astable and monostable | Astable and monostable | Astable and monostable |
主な差別化要因
- Higher documented output-drive capability than CMOS timer alternatives （vs LMC555CM)
- Broad timing range with a 100 kHz frequency class （vs SE555DR)
- Established classic 555 function with adjustable duty cycle （vs ICM7555IBAT)
設計ノート
Place the timing resistor, timing capacitor, and any control-node bypass capacitor close to the LM555CM pins. Keep the discharge-capacitor current loop compact because the internal discharge transistor switches the capacitor repeatedly. Route the supply and ground return paths directly to the IC, and place the supply bypass capacitor at the power pin rather than at the board edge. These layout practices reduce parasitic inductance and timing variation.
The verified LM555CM supply range is 4.5 V to 16 V, and the listed output-drive capability is 200 mA. Do not interpret that drive figure as permission to exceed the device's output or total-power limits. Check the load current, duty cycle, output voltage levels, and temperature rise together. When driving an inductive relay or motor, add suitable flyback suppression so that the resulting transient remains within the LM555CM's absolute maximum conditions.
Timing accuracy is not determined by the LM555CM alone. Resistor tolerance, capacitor tolerance and temperature coefficient, supply variation, and trigger timing all affect the resulting interval. Use the manufacturer's timing equations and the 0.005%/°C device stability specification as separate contributions. Also follow the datasheet connection requirements for the reset and control pins; incorrect biasing can prevent stable oscillation or produce a longer output pulse than intended.
コンプライアンス情報
The supplied verified data does not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. These fields remain unknown rather than being inferred from general distributor listings.