Renesas ICM7556IPD

Overview

ICM7556IPD from Renesas Electronics is a dual CMOS precision timer IC, functionally equivalent to two independent ICM7555 timers sharing only V+ and GND. It delivers 120µA supply current at 15V, supports 2V–18V operation, achieves ≤2% astable/monostable timing accuracy with 1MHz max frequency, and enables microsecond-to-hour timing in both astable and monostable modes - used in pulse-width modulation, missing-pulse detection, and sequential timing circuits.

For engineers reviewing the ICM7556IPD datasheet, ICM7556IPD pinout, ICM7556IPD application, or ICM7556IPD equivalent, this page provides verified package mapping (14-lead PDIP), validated dual-timer functional behavior, confirmed low-input-current operation (20pA), guaranteed temperature stability (0.005%/°C), and direct replacement guidance for legacy SE/NE556 designs without layout changes.

Technical Context

The ICM7556IPD integrates two fully independent CMOS-based 555-compatible timer cores, each with rail-to-rail output drivers, high-impedance comparators (20pA input bias), and no crowbar current during transitions. Its dual architecture allows simultaneous monostable and astable operation with separate external RC networks per channel.

Unlike bipolar 555/556 timers, the ICM7556IPD eliminates mandatory Control Voltage decoupling and reduces supply decoupling requirements due to sub-3mA transient currents. Threshold and Trigger trip points are fixed at ~2/3VDD and ~1/3VDD respectively, with Reset threshold stable at 0.4–1.0V across 2–15V supply range.

Key Specifications

Pinout & Package

ICM7556IPD is housed in a 14-lead plastic dual-in-line package (PDIP), RoHS-compliant, with 0.300-inch body width and 0.100-inch lead pitch per JEDEC MS-001-AA ISSUE D (PKG DWG E14.3). Pin 1 is top-left corner with index notch or dot marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NE556DR and TLC556CP, the ICM7556IPD uniquely combines industrial temperature rating (−25°C to +85°C), lowest input bias (20pA), and lowest supply current (120µA at 15V), making it optimal for precision, low-power, wide-temperature embedded timing.

Availability

ICM7556IPD is available at Aetrix Electronics and suitable for precision timing, pulse generation, sequential timing, and time delay generation requiring stable component supply across industrial temperature ranges and long product lifecycles.

Supply support for ICM7556IPD 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

Renesas Electronics is a global semiconductor leader delivering microcontrollers, analog, power, and timing solutions for automotive, industrial, and IoT applications.

The ICM7556IPD belongs to Renesas' general-purpose timer IC product line, designed specifically to replace legacy bipolar 556 timers with enhanced accuracy, lower power, and improved noise immunity in industrial control and instrumentation systems.

FAQ

What is the operating temperature range for the ICM7556IPD?

The ICM7556IPD is rated for operation from −25°C to +85°C, as confirmed in the FN2867 Rev.10.01 datasheet under "Operating Conditions". This industrial-grade range makes the ICM7556IPD suitable for deployment in harsh environments such as factory automation controllers, outdoor sensor nodes, and power supply sequencers where ambient temperatures exceed commercial limits. The ICM7556IPD maintains its ±2% timing accuracy and 0.005%/°C drift specification across this full range.

Does the ICM7556IPD require a decoupling capacitor on the Control Voltage pin?

No, the ICM7556IPD does not require a decoupling capacitor on either CONTROL VOLTAGE1 or CONTROL VOLTAGE2 pins. Its CMOS input structure provides extremely high impedance (20pA bias current), eliminating the need for external filtering that is mandatory for bipolar 556 timers. This is explicitly stated in the datasheet's "Application Information" section and verified in Figure 3 showing negligible supply transients during output transitions. The ICM7556IPD's internal comparator design inherently rejects noise without external capacitance.

Can the two timers in the ICM7556IPD operate simultaneously and independently?

Yes, the two timers in the ICM7556IPD operate fully independently - they share only the VDD and GND supply rails. Each timer has dedicated TRIGGER, THRESHOLD, RESET, OUTPUT, DISCHARGE, and CONTROL VOLTAGE pins, allowing separate RC timing networks, asynchronous resets, and distinct modulation paths. The datasheet confirms this in the "General Purpose Timers" introduction and functional diagram (Figure 1), where no shared internal nodes exist between the two comparator/flip-flop blocks. This independence enables true concurrent timing functions in the ICM7556IPD.

What is the maximum load the ICM7556IPD output can drive?

The ICM7556IPD OUTPUT pins can sink up to 20mA at VDD = 5V (VOL = 0.4V) and source up to 0.8mA at VDD = 15V (VOH = 14.3V), per the Electrical Specifications table on page 4 of FN2867 Rev.10.01. This allows direct interfacing with standard TTL loads (≥2 TTL units) at VDD ≥ 4.5V and full rail-to-rail CMOS logic swings at all supply voltages. The ICM7556IPD output driver is a robust CMOS inverter, not limited by bipolar saturation, ensuring clean switching even under moderate capacitive loads.

Is the ICM7556IPD pin-compatible with the NE556?

Yes, the ICM7556IPD is pin-compatible with the NE556 in the 14-lead PDIP package. Pin assignments match identically: DISCHARGE1/2, TRIGGER1/2, OUTPUT1/2, RESET1/2, CONTROL VOLTAGE1/2, THRESHOLD1/2, VDD, and GND occupy the same positions. This mechanical and electrical compatibility is documented in the "Pin Configurations" section (page 2) and confirmed by the shared E14.3 package outline. No PCB redesign is needed when upgrading from NE556 to ICM7556IPD.