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Renesas ICM7555CBA-T
- Part No.:
- ICM7555CBA-T
- Manufacturer:
- Renesas
- Category:
- Programmable Timers and Oscillators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICM7555CBA-T.pdf
- Description:
- IC OSC SINGLE TIMER 1MHZ 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,472
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Product details
Overview
ICM7555CBA-T from Renesas Electronics is a CMOS general-purpose timer IC providing precise monostable and astable timing functions with low supply current (60 µA typ. at 15 V), wide supply range (2 V to 18 V), and ultra-low input currents (20 pA). It serves as a direct replacement for bipolar 555 timers in precision delay, pulse generation, and oscillator applications across industrial and embedded systems.
For engineers reviewing the ICM7555CBA-T datasheet, ICM7555CBA-T pinout, ICM7555CBA-T application, or ICM7555CBA-T equivalent, key selection criteria include its guaranteed 2–18 V operation, 1 MHz max oscillator frequency, 2% timing accuracy, temperature-stable threshold/trigger thresholds (0.005%/°C), and SOIC-8 package compatibility with legacy 555 footprints.
Technical Context
The ICM7555CBA-T implements a dual-comparator + SR flip-flop architecture with high-impedance CMOS inputs, eliminating crowbar current during output transitions and removing the need for Control Voltage decoupling. Its internal comparators reference fixed fractions of VDD (≈1/3 and ≈2/3) with drift under 0.005%/°C at +25°C.
It supports both monostable (one-shot) and astable (free-running oscillator) modes using external RC networks. In monostable mode, output pulse width is t = 1.1 × R × C; in astable mode, frequency and duty cycle are controlled by two resistors and one capacitor per standard equations f = 1.44 / ((RA + 2RB) × C) and D = (RA + RB) / (RA + 2RB).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 18 V - enables single-supply operation across battery-powered (2 V) and industrial rail (15–18 V) systems without level-shifting. |
| Supply Current (typ) | 60 µA at 15 V - reduces system power budget by >99% vs. bipolar 555 (300–400 mA spikes), enabling always-on timing in low-power IoT nodes. |
| Input Current (max) | 20 pA - permits use of high-value timing resistors (up to 100 MΩ) for hour-scale delays without leakage-induced error. |
| Max Oscillator Frequency | 1 MHz - supports fast PWM generation and clock synthesis up to audio-band frequencies with stable RC control. |
| Timing Accuracy | ±2% - ensures predictable pulse widths and frequencies in production without individual calibration. |
| Threshold/Trigger Drift | 0.005%/°C at +25°C - maintains timing stability over industrial temperature range (0°C to +70°C) without compensation circuitry. |
| Output Drive | Sinks 20 mA / Sources 0.8 mA - directly drives TTL loads or interfaces to CMOS logic without buffer stages. |
Pinout & Package
ICM7555CBA-T is housed in an 8-lead narrow-body SOIC (M8.15) RoHS-compliant plastic package with 1.27 mm lead pitch, 5.20 mm body width, and JEDEC MS-012-AA compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Common return path for all internal circuits and external timing components; must be low-impedance for stable timing. |
| 2 (TRIGGER) | Monostable trigger input | Falling-edge sensitive; asserts when voltage drops below ≈1/3 VDD to initiate one-shot timing cycle. |
| 3 (OUTPUT) | Push-pull output driver | Rail-to-rail CMOS output capable of sourcing/sinking sufficient current for TTL/CMOS loads without external buffering. |
| 4 (RESET) | Asynchronous reset | Active-low override: forces OUTPUT low and DISCHARGE on regardless of TRIGGER/THRESHOLD state. |
| 5 (CONTROL VOLTAGE) | Comparator reference adjust | Modifies internal trip points (≈1/3 and ≈2/3 VDD); no decoupling capacitor required due to 20 pA input current. |
| 6 (THRESHOLD) | Astable mode timing input | Rising-edge sensitive; resets flip-flop when voltage exceeds ≈2/3 VDD, ending timing cycle or discharging capacitor. |
| 7 (DISCHARGE) | Open-drain discharge switch | Internally connected to OUTPUT logic; sinks current to ground during timing cycle to discharge external capacitor. |
| 8 (VDD) | Positive supply | Accepts 2–18 V DC; powers all internal circuitry and defines comparator reference levels and output swing. |
Key Features
| Feature | Design Value |
|---|---|
| Direct SE/NE 555 replacement | Pin-compatible with standard 555 in SOIC-8; requires no PCB changes or schematic modification in most designs. |
| No supply decoupling needed | Eliminates 100 nF bypass capacitor near VDD pin due to absence of crowbar current (only 2–3 mA spikes vs. 400 mA in bipolar 555). |
| High-impedance timing inputs | 20 pA max input current enables RC time constants from microseconds to hours using standard passive components. |
| Stable control voltage interface | Control Voltage pin operates without external capacitor, simplifying FM modulation or voltage-controlled delay designs. |
| Guaranteed operation down to 2 V | Supports single-cell Li-ion (3.0–4.2 V), alkaline (1.5 V × 2), or coin-cell (3 V) powered portable instruments. |
Applications
| Industrial Timer Module | Portable Pulse Generator |
|---|---|
Use Scenario: Programmable delay relay in PLC I/O expansion modules requiring precise 100 ms–10 s activation windows. IC Role / Device Role / Timing Role: Monostable one-shot generating fixed-duration output pulses triggered by digital sensor interrupts. Use Value: ±2% timing accuracy eliminates field calibration; 60 µA quiescent current extends module battery life beyond 5 years in sleep-wake cycles. | Use Scenario: Handheld test instrument generating adjustable-width pulses for sensor excitation or logic fault injection. IC Role / Device Role / Timing Role: Astable oscillator with user-adjustable RA/RB potentiometers controlling frequency (1 Hz–100 kHz) and duty cycle (10%–90%). Use Value: Rail-to-rail CMOS output drives 50 Ω coaxial cable directly; 2–18 V supply range allows operation from USB (5 V) or bench supply (12 V). |
| Power Supply Sequencing | Missing Pulse Detector |
Use Scenario: Controlled startup sequence for multi-rail FPGA power supplies where 3.3 V must stabilize before 1.2 V is enabled. IC Role / Device Role / Timing Role: Monostable timer delaying enable signal to secondary regulator after primary rail reaches regulation. Use Value: 20 pA input leakage prevents timing drift over temperature; SOIC-8 footprint fits tight space constraints on dense power management PCBs. | Use Scenario: Safety-critical motor controller monitoring encoder pulses; triggers shutdown if >50 ms gap occurs between edges. IC Role / Device Role / Timing Role: Retriggerable monostable whose output stays high while pulses arrive; goes low only after timeout. Use Value: Reset dominance ensures immediate response to missing pulse; 0.005%/°C drift guarantees consistent timeout across -20°C to +70°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar timer IC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC555CP | CMOS 555 with 100 µA supply current (vs. 60 µA), 2 V–16 V range, and 2.5 MHz max frequency; PDIP-8 only. | Higher supply current increases battery drain; wider frequency range suits RF clocking but not required for standard timing. | Select TLC555CP only if PDIP-8 through-hole assembly is mandatory and higher speed is needed. |
| NE555P | Bipolar 555 with 10 mA supply current, 4.5 V–16 V range, crowbar current, and 500 kHz max frequency; requires VDD decoupling and CV capacitor. | Higher power, lower accuracy (±5%), and thermal drift limit use in precision or low-power applications. | Choose NE555P only for cost-sensitive, non-battery, non-precision applications where legacy design reuse is critical. |
Compared with TLC555CP and NE555P, the ICM7555CBA-T delivers superior power efficiency (60 µA vs. 100 µA/10 mA), tighter timing accuracy (±2% vs. ±3%/±5%), and simplified layout (no decoupling caps), making it optimal for modern low-power, high-reliability embedded timing.
Availability
ICM7555CBA-T is available at Aetrix Electronics and suitable for industrial timer modules, portable pulse generators, power supply sequencing circuits, and missing pulse detectors requiring stable component supply across extended production lifecycles.
Supply support for ICM7555CBA-T 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 markets.
The ICM7555CBA-T belongs to Renesas' precision timing IC product line, engineered for drop-in replacement of legacy 555 timers while delivering ultra-low power, high accuracy, and robust operation across wide voltage and temperature ranges.
FAQ
What is the operating temperature range for the ICM7555CBA-T?
The ICM7555CBA-T is specified for commercial temperature operation from 0°C to +70°C, matching the ICM7555C grade defined in the FN2867 datasheet. This range supports deployment in office equipment, consumer electronics, and industrial control panels where ambient temperatures remain within standard indoor environments. The device's 0.005%/°C temperature coefficient ensures minimal timing drift across this span.
Does the ICM7555CBA-T require a decoupling capacitor on the Control Voltage pin?
No, the ICM7555CBA-T does not require a decoupling capacitor on the Control Voltage (pin 5) due to its ultra-low 20 pA input current and high-impedance CMOS comparator inputs. Unlike bipolar 555 timers, this eliminates one external component per timer, reducing BOM count and board area-especially valuable in dual-timer ICM7556 designs where two capacitors are saved.
Can the ICM7555CBA-T drive TTL logic directly?
Yes, the ICM7555CBA-T can drive at least two standard TTL loads when VDD ≥ 4.5 V, as confirmed by its output sink/source specifications: VOL = 0.4 V at 20 mA sink and VOH = 4.3 V at 0.8 mA source (VDD = 5 V). Its rail-to-rail CMOS output swing ensures full logic-level compatibility without level-shifting circuitry.
What is the maximum frequency achievable in astable mode with the ICM7555CBA-T?
The ICM7555CBA-T achieves a maximum oscillator frequency of 1 MHz under specified conditions (VDD = 5 V, RA = 470 Ω, RB = 270 Ω, C = 200 pF), as stated in the Electrical Specifications table on page 4 of FN2867 Rev. 10.01. This limit arises from internal propagation delays and comparator response times-not from external RC constraints.
Is the ICM7555CBA-T pin-compatible with the NE555P in SOIC-8 packaging?
Yes, the ICM7555CBA-T uses the same 8-pin SOIC package (M8.15) and identical pinout as the NE555P in SOIC-8 variants, enabling direct PCB footprint replacement. All eight pins-GND, TRIGGER, OUTPUT, RESET, CONTROL VOLTAGE, THRESHOLD, DISCHARGE, and VDD-map functionally and physically, allowing seamless migration without layout revision.
ICM7555CBA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- 555 Type, Timer/Oscillator (Single)
- Count:
- -
- Frequency:
- 1MHz
- Voltage - Supply:
- 2V ~ 18V
- Current - Supply:
- 60 µA
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ICM7555CBA-T FAQ
1.How can I place an order for ICM7555CBA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ICM7555CBA-T 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 ICM7555CBA-T reliable?
The price and inventory of ICM7555CBA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICM7555CBA-T is usually 5 days.
3.What payment methods are accepted for ICM7555CBA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICM7555CBA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICM7555CBA-T?
ICM7555CBA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICM7555CBA-T 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 ICM7555CBA-T?
For technical support, including ICM7555CBA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICM7555CBA-T requirements.
6.How does Aetrix verify that ICM7555CBA-T is sourced from the original manufacturer or authorized distributors?
All ICM7555CBA-T 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 ICM7555CBA-T meets industry standards.
7.What is the process for return or replacement of ICM7555CBA-T?
All ICM7555CBA-T units undergo pre-shipment inspection (PSI). If there is an issue with ICM7555CBA-T, 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 ICM7555CBA-T part is unused and in its original packaging.
Return procedure for ICM7555CBA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ICM7555CBA-T Tags
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