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NXP Semiconductors ICM7555CN/01,112
- Part No.:
- ICM7555CN/01,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Programmable Timers and Oscillators
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ICM7555CN/01,112.pdf
- Description:
- IC OSC SINGLE TIMER 500KHZ 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,795
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Product details
Overview
ICM7555CN/01,112 from NXP Semiconductors is a CMOS general-purpose timer IC designed as a low-power, high-precision replacement for the NE/SE555 in monostable and astable configurations. It delivers 80 µA typical supply current, 20 pA typical trigger/threshold/reset input currents, rail-to-rail output swing, and guaranteed 500 kHz oscillator operation across 3 V to 16 V supply - enabling precision timing from microseconds to hours in industrial control and instrumentation circuits.
For engineers reviewing the ICM7555CN/01,112 datasheet, ICM7555CN/01,112 pinout, ICM7555CN/01,112 application, or ICM7555CN/01,112 equivalent, this device offers verified drop-in compatibility with legacy 555 designs while eliminating mandatory CONTROL_VOLTAGE decoupling and reducing supply crowbar current from ~350 mA to <3 mA - critical for low-noise analog subsystems and battery-powered timing nodes.
Technical Context
The ICM7555CN/01,112 implements dual high-impedance CMOS comparators feeding an RS flip-flop, with a push-pull CMOS output driver capable of sourcing/sinking ≥1 mA at 5 V and driving TTL/CMOS loads directly. Its internal voltage dividers set TRIGGER and THRESHOLD thresholds at ≈1/3 VDD and ≈2/3 VDD, respectively, and RESET dominates all other inputs with active-LOW assertion.
Unlike bipolar 555 timers, it avoids supply current crowbarring during output transitions due to absence of complementary output transistor overlap, and its CONTROL_VOLTAGE pin operates with >1012 Ω input impedance - permitting direct modulation of oscillation frequency or delay time without external buffering or decoupling capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 16 V - supports single-supply operation across battery, logic, and industrial rails without level-shifting. |
| Supply Current (Typ) | 80 µA - enables multi-year operation from coin cells in low-duty-cycle timing applications. |
| Input Bias Current (Typ) | 20 pA on TRIGGER/THRESHOLD/RESET - permits use of >10 MΩ timing resistors for hour-scale delays without error drift. |
| Oscillator Frequency (Guaranteed) | 500 kHz - ensures reliable high-speed pulse generation in PWM and clock synthesis without derating. |
| Output Drive | Rail-to-rail CMOS swing - delivers full VDD logic HIGH and <0.4 V logic LOW at 3.2 mA sink, compatible with 5 V TTL and wide-VDD CMOS. |
| Temperature Stability | 0.005 %/°C at 25 °C - minimizes timing drift in unregulated environments such as automotive cabin modules. |
| Operating Temperature | 0 °C to +70 °C - qualified for commercial-grade embedded systems including test equipment and consumer electronics. |
Pinout & Package
DIP8 plastic dual in-line package (300 mil, SOT97-1), 8-pin through-hole mount with 0.1 inch lead pitch - compatible with standard PCB footprints and wave-soldering processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Supply ground reference | Common return path for all internal circuitry; must be low-impedance to minimize noise coupling into comparators. |
| TRIGGER (Pin 2) | Monostable start input | Active-LOW signal initiating timing cycle; threshold ≈0.31×VDD ensures robust noise immunity in noisy industrial settings. |
| OUTPUT (Pin 3) | Logic-level output | CMOS push-pull driver delivering full rail swing; sinks 3.2 mA at <0.4 V, sources 1 mA at >4.0 V (5 V supply). |
| RESET (Pin 4) | Timer inhibit input | Active-LOW override that forces OUTPUT LOW and DISCHARGE ON regardless of other inputs - used for emergency stop or synchronization. |
| CONTROL_VOLTAGE (Pin 5) | Threshold reference adjust | Direct access to internal voltage divider node; modulating this pin varies TRIGGER/THRESHOLD thresholds for FM or variable-delay operation. |
| THRESHOLD (Pin 6) | Capacitor upper-voltage sense | Monitors timing capacitor voltage; transition at ≈0.65×VDD resets flip-flop in monostable mode or terminates charge phase in astable mode. |
| DISCHARGE (Pin 7) | Timing capacitor discharge path | Open-drain NMOS switch (VOL < 0.4 V at 10 mA) that rapidly discharges external capacitor during timing cycle reset. |
| VDD (Pin 8) | Positive supply input | Accepts 3–16 V DC; no external decoupling required due to absence of supply current transients during output switching. |
Key Features
| Feature | Design Value |
|---|---|
| NE/SE555 functional equivalence | Pin-compatible replacement with identical DIP8 footprint and identical external component interface - no PCB redesign needed. |
| No CONTROL_VOLTAGE decoupling | Eliminates 10 nF capacitor requirement, reducing BOM count and board area in space-constrained designs like portable meters. |
| Ultra-low input leakage | 20 pA typical bias current enables >100 s time constants using 10 MΩ/10 µF networks - impractical with bipolar 555's µA-level leakage. |
| High-frequency stability | ±1.0% to ±5.0% frequency tolerance over voltage/temperature - suitable for precision clock generation in data acquisition front-ends. |
| Rail-to-rail output drive | Drives 2 TTL loads at ≥4.5 V supply or interfaces directly with 3.3 V/5 V CMOS logic without level shifters. |
Applications
| Precision Pulse Width Modulation | Missing Pulse Detection |
|---|---|
Use Scenario: Generating adjustable-duty-cycle square waves for motor speed control or LED dimming in industrial HMI panels. IC Role / Device Role / Timing Role: Astable oscillator with RA/RB ratio controlling duty cycle; CONTROL_VOLTAGE pin used for real-time modulation via DAC. Use Value: Achieves <1% duty cycle resolution over 1–99% range using standard 1% resistors, eliminating need for dedicated PWM ICs. |
Use Scenario: Monitoring periodic encoder signals in CNC motion controllers to halt axis movement if pulses exceed 200 ms interval. IC Role / Device Role / Timing Role: Monostable one-shot triggered by each encoder edge; RESET held HIGH until timeout triggers safety shutdown. Use Value: Guarantees response within 1 µs jitter due to fixed comparator thresholds - faster and more deterministic than microcontroller-based detection. |
| Long-Duration Time Delay Generator | Sequential Timing Controller |
Use Scenario: Providing 30-minute power-on delay for HVAC compressor startup to prevent inrush current stacking. IC Role / Device Role / Timing Role: Monostable configuration with 10 MΩ resistor and 3.3 µF capacitor; GND-referenced TRIGGER for manual activation. Use Value: Delivers ±0.5% accuracy over temperature using low-leakage film capacitor - outperforms RC networks with op-amp integrators. |
Use Scenario: Coordinating stage sequencing in automated test equipment where four solenoids activate in strict 2 s intervals. IC Role / Device Role / Timing Role: Cascaded monostables with DISCHARGE outputs feeding next stage's TRIGGER; RESET synchronized to system master clock. Use Value: Ensures inter-stage delay variation <±20 ns across 0–70 °C - critical for repeatability in metrology-grade testers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar timer IC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMC555IMX/NOPB | TI CMOS 555 with 100 µA max supply current; 50 pA input bias; SOIC-8 only; no DIP8 option. | Requires PCB redesign for surface-mount assembly; lacks direct DIP8 drop-in capability for legacy through-hole systems. | Select when new designs prioritize RoHS-compliant SOIC packaging and TI supply chain continuity. |
| TLC555CP | TI CMOS 555 with 100 µA typical supply current; 50 pA input bias; DIP8 available; 2 MHz max frequency. | Higher max frequency but looser initial accuracy (±2% vs ±1%); requires CONTROL_VOLTAGE decoupling per datasheet. | Select when higher oscillator headroom is needed and minor accuracy trade-off is acceptable for cost-sensitive production. |
Compared with LMC555IMX/NOPB and TLC555CP, the ICM7555CN/01,112 uniquely combines DIP8 through-hole compatibility, lowest input bias (20 pA), guaranteed 500 kHz operation, and zero-control-voltage-decoupling design - making it the optimal choice for retrofitting legacy 555-based equipment without layout changes or performance compromise.
Availability
ICM7555CN/01,112 is available at Aetrix Electronics and suitable for industrial control panels, test instrumentation, and consumer appliance timing circuits requiring stable component supply across long production lifecycles.
Supply support for ICM7555CN/01,112 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The ICM7555CN/01,112 belongs to NXP's general-purpose analog timer product line, engineered specifically to replace legacy bipolar 555 timers with enhanced precision, lower power, and improved noise immunity in commercial-grade embedded systems.
FAQ
Is ICM7555CN/01,112 a direct pin-for-pin replacement for NE555 in DIP8 sockets?
Yes, the ICM7555CN/01,112 uses the same DIP8 package (SOT97-1) and identical pinout as the NE555, supporting direct socket replacement. Its CMOS architecture eliminates supply crowbarring and removes the need for CONTROL_VOLTAGE decoupling, but all external resistor/capacitor connections remain unchanged - verified across 3 V to 16 V operation.
What is the maximum timing capacitor value usable with ICM7555CN/01,112 in monostable mode?
The ICM7555CN/01,112 supports timing capacitors up to 1000 µF in monostable mode when paired with high-value resistors (e.g., 10 MΩ), enabled by its 20 pA typical input bias current. Leakage currents in electrolytic capacitors become the limiting factor beyond this point, not the IC itself - confirmed in NXP's Figure 13 characteristic curves.
Does ICM7555CN/01,112 require a bypass capacitor on the VDD pin?
No, the ICM7555CN/01,112 does not require a VDD bypass capacitor due to its CMOS output stage, which eliminates the large supply current spikes (300–400 mA) seen in bipolar 555 timers during output transitions. NXP explicitly states supply decoupling is "normally not necessary" - validated by transient current measurements in Figure 14 of the datasheet.
Can ICM7555CN/01,112 operate reliably at 2.5 V supply voltage?
No, the ICM7555CN/01,112 is specified for 3 V to 16 V operation per Table 5. At 2.5 V, comparator thresholds and output drive fall outside guaranteed limits - the minimum TRIGGER threshold is 0.29×VDD (≈0.73 V), which becomes non-functional below 3 V. For sub-3 V applications, consider the TLC551 or LMC555 with 1.5 V min rating.
How does RESET functionality differ between ICM7555CN/01,112 and NE555?
In the ICM7555CN/01,112, RESET directly controls the internal RS flip-flop, simultaneously forcing OUTPUT LOW and DISCHARGE ON - avoiding the metastability and slow-edge sensitivity issues of the NE555's open-collector RESET path. This results in deterministic, sub-100 ns reset propagation across temperature, as documented in Section 11.7 of the NXP datasheet.
ICM7555CN/01,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- 555 Type, Timer/Oscillator (Single)
- Count:
- -
- Frequency:
- 500kHz
- Voltage - Supply:
- 3V ~ 16V
- Current - Supply:
- 180 µA
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-DIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
ICM7555CN/01,112 FAQ
1.How can I place an order for ICM7555CN/01,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for ICM7555CN/01,112 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ICM7555CN/01,112 reliable?
The price and inventory of ICM7555CN/01,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICM7555CN/01,112 is usually 5 days.
3.What payment methods are accepted for ICM7555CN/01,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICM7555CN/01,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICM7555CN/01,112?
ICM7555CN/01,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICM7555CN/01,112 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ICM7555CN/01,112?
For technical support, including ICM7555CN/01,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICM7555CN/01,112 requirements.
6.How does Aetrix verify that ICM7555CN/01,112 is sourced from the original manufacturer or authorized distributors?
All ICM7555CN/01,112 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ICM7555CN/01,112 meets industry standards.
7.What is the process for return or replacement of ICM7555CN/01,112?
All ICM7555CN/01,112 units undergo pre-shipment inspection (PSI). If there is an issue with ICM7555CN/01,112, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ICM7555CN/01,112 part is unused and in its original packaging.
Return procedure for ICM7555CN/01,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ICM7555CN/01,112 Tags
-
NE555DR
Texas Instruments
-
SA555DR
Texas Instruments
-
NA555DR
Texas Instruments
-
SE555DR
Texas Instruments
-
NE555P
Texas Instruments
-
CD4541BM96
Texas Instruments
-
CD4541BE
Texas Instruments
-
TLC555QDR
Texas Instruments
-
TLC555IDR
Texas Instruments
-
TLC555QDRQ1
Texas Instruments
-
TPL5010DDCR
Texas Instruments
-
TLC555CP
Texas Instruments
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