NXP Semiconductors ICM7555IN/01,112

Overview

ICM7555IN/01,112 from NXP Semiconductors is a CMOS precision timer IC operating as a direct functional replacement for NE/SE555 in monostable and astable modes, with 80 µA typical supply current, 20 pA typical trigger/threshold/reset input currents, rail-to-rail output swing, and guaranteed 500 kHz oscillator frequency across −40 °C to +85 °C. It enables accurate time delays from microseconds to hours in industrial timing circuits.

For engineers reviewing the ICM7555IN/01,112 datasheet, ICM7555IN/01,112 pinout, ICM7555IN/01,112 application, or ICM7555IN/01,112 equivalent, key selection criteria include its low-input-current comparators enabling high-impedance RC networks, absence of supply crowbarring during transitions, no requirement for CONTROL_VOLTAGE decoupling, and automotive-grade temperature range support.

Technical Context

The ICM7555IN/01,112 implements dual high-impedance CMOS comparators feeding an SR flip-flop, with independent TRIGGER (active LOW) and THRESHOLD inputs controlling state transitions. Its internal discharge switch connects DISCHARGE to GND only when OUTPUT is LOW, enabling precise capacitor charge/discharge control in both monostable and astable configurations.

Unlike bipolar 555 timers, the ICM7555IN/01,112 uses CMOS output drivers capable of sourcing/sinking ≥1 mA while maintaining rail-to-rail voltage swing across 3 V–16 V supply range. Timing stability is enhanced by temperature coefficient of 0.005 %/°C and supply-voltage-insensitive thresholds derived from internal resistive divider.

Key Specifications

Pinout & Package

DIP8 plastic dual in-line package (SOT97-1), 8-pin through-hole mount with 300 mil body width, compatible with standard 0.1″ pitch PCB footprints and wave soldering processes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar timer IC applications.

Compared with NE555P and LMC555CN, the ICM7555IN/01,112 delivers superior leakage performance (20 pA vs. 500 nA/0.05 pA), wider temperature qualification (−40 °C to +85 °C), and guaranteed 500 kHz operation-making it optimal for automotive, industrial, and long-life battery-powered timing.

Availability

ICM7555IN/01,112 is available at Aetrix Electronics and suitable for precision timing, pulse generation, and time delay applications requiring stable component supply across automotive, industrial control, and test equipment programs.

Supply support for ICM7555IN/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 markets.

The ICM7555IN/01,112 belongs to NXP's general-purpose analog timer product line, designed specifically to replace legacy bipolar 555 timers with CMOS efficiency, precision, and extended temperature reliability in mission-critical timing functions.

FAQ

What is the maximum supply voltage rating for the ICM7555IN/01,112?

The ICM7555IN/01,112 has an absolute maximum supply voltage (VDD) of 18 V per Table 4 in the NXP datasheet. Continuous operation above 16 V is not recommended, as electrical characteristics are only guaranteed from 3 V to 16 V. Exceeding 18 V risks destructive latch-up due to SCR structure inherent in the CMOS fabrication process, so proper voltage regulation and transient protection are essential in the ICM7555IN/01,112 power path.

Does the ICM7555IN/01,112 require a decoupling capacitor on the CONTROL_VOLTAGE pin?

No, the ICM7555IN/01,112 does not require a decoupling capacitor on the CONTROL_VOLTAGE pin. Its CMOS input structure provides extremely high impedance (>10¹² Ω), eliminating the need for external stabilization. This is confirmed in Section 11.1 of the NXP datasheet, which states "CONTROL_VOLTAGE decoupling capacitors are not required since the input impedance of the CMOS comparators on chip are very high." The ICM7555IN/01,112 thus reduces BOM count and PCB area versus NE/SE555 implementations.

Can the ICM7555IN/01,112 drive TTL loads directly?

Yes, the ICM7555IN/01,112 can drive at least two standard TTL loads when VDD ≥ 4.5 V, as specified in Section 11.3 of the NXP datasheet. Its CMOS output driver sources/sinks ≥1 mA with rail-to-rail swing, delivering VOH ≥ 4.0 V and VOL ≤ 0.4 V at VDD = 5 V and 3.2 mA sink current. This meets TTL input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) with sufficient noise margin, making direct interface to 74LS and 74HC families possible without buffer stages in the ICM7555IN/01,112 design.

What is the minimum trigger pulse width supported by the ICM7555IN/01,112?

The ICM7555IN/01,112 supports minimum trigger pulse widths down to 100 ns at VDD = 5 V, as shown in Figure 8 of the NXP datasheet. At higher supply voltages (e.g., 18 V), the minimum pulse width decreases further to ~50 ns. This fast response enables reliable triggering from high-speed digital signals and narrow-edge sensors, provided the TRIGGER voltage falls below 0.31×VDD for the full duration. The ICM7555IN/01,112's low input capacitance and CMOS input stage ensure minimal propagation delay variation across temperature.

Is the ICM7555IN/01,112 pin-compatible with the NE555P in DIP8 packages?

Yes, the ICM7555IN/01,112 is pin-compatible with the NE555P in DIP8 packages (SOT97-1). Both devices share identical pin numbering, function mapping, and mechanical dimensions per Figures 3 and 18 of the NXP datasheet. This allows direct socket replacement in existing PCB layouts without modification. However, due to differences in input leakage (20 pA vs. 500 nA) and supply current (80 µA vs. 10 mA), RC timing component values may require verification to maintain target delay accuracy in the ICM7555IN/01,112 implementation.