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Renesas ICM7555CBA
- Part No.:
- ICM7555CBA
- Manufacturer:
- Renesas
- Category:
- Programmable Timers and Oscillators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICM7555CBA.pdf
- Description:
- IC OSC SINGLE TIMER 1MHZ 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,720
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Product details
Overview
ICM7555CBA from Renesas Electronics is a CMOS general-purpose timer IC designed as a low-power, high-accuracy replacement for the classic NE555 in monostable and astable configurations. It delivers 60µA supply current at 15V, operates from 2V to 18V, features 20pA input currents, supports up to 1MHz oscillation, and maintains timing accuracy within ±2% over temperature and supply voltage variations. It is widely used in precision time-delay circuits, pulse-width modulation, and missing-pulse detection.
For engineers reviewing the ICM7555CBA datasheet, ICM7555CBA pinout, ICM7555CBA application, or ICM7555CBA equivalent, key selection considerations include its SOIC-8 RoHS-compliant package, guaranteed 0°C to +70°C operating range, absence of supply crowbarring, and elimination of Control Voltage decoupling capacitors - enabling simpler, more reliable timing designs with extended RC time constants.
Technical Context
The ICM7555CBA implements dual CMOS comparators, an SR flip-flop, and a push-pull output driver to precisely control timing via external R-C networks. Its threshold (67% VDD) and trigger (32% VDD) trip points are internally derived and stable across supply voltage and temperature.
Unlike bipolar 555 timers, it avoids destructive latch-up by limiting input voltage to VDD ±0.3V and eliminates large supply transients during output transitions - enabling direct use without local bypass capacitors in many applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0V to 18.0V - enables single-supply operation across battery-powered and industrial rails without level-shifting. |
| Supply Current (Typ) | 60µA at 15V - reduces system power budget and thermal load versus bipolar 555s drawing >300mA peaks. |
| Input Current (Max) | 20pA - permits use of high-impedance timing resistors (>10MΩ), extending delay ranges into hours. |
| Max Oscillator Frequency | 1MHz - supports fast PWM generation and high-speed pulse shaping without external amplification. |
| Timing Accuracy | ±2% at TA = +25°C - ensures predictable delay or frequency without calibration in production designs. |
| Temperature Drift | 0.005%/°C - provides stable timing performance across ambient shifts in consumer and industrial environments. |
| Output Drive | Sinks 20mA / Sources 0.8mA - directly interfaces TTL logic and drives CMOS loads with rail-to-rail swing. |
Pinout & Package
ICM7555CBA is housed in an 8-lead narrow-body SOIC package (JEDEC MS-012-AA, Renesas pkg code M8.15), RoHS-compliant, with 1.27mm lead pitch and 5.20mm body width.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Common return path for all internal circuitry and external timing components. |
| 2 (TRIGGER) | Falling-edge input | Initiates monostable output pulse when voltage drops below 32% VDD; high impedance (20pA) minimizes loading. |
| 3 (OUTPUT) | CMOS push-pull output | Drives TTL/CMOS loads directly; logic HIGH ≈ VDD, LOW ≈ 0.4V at 20mA sink. |
| 4 (RESET) | Asynchronous reset input | Forces OUTPUT low and DISCHARGE on regardless of other inputs; trip point ~0.7V. |
| 5 (CONTROL VOLTAGE) | Comparator reference adjust | Modifies internal 2/3 and 1/3 VDD thresholds; no decoupling capacitor required due to 20pA leakage. |
| 6 (THRESHOLD) | Falling-edge termination input | Ends monostable pulse when voltage rises above 67% VDD; high-impedance interface to RC network. |
| 7 (DISCHARGE) | Open-drain discharge switch | Internally connects to GND during LOW output phase to discharge external timing capacitor. |
| 8 (VDD) | Positive supply | Accepts 2–18V DC; no external decoupling needed in most layouts due to <3mA transient spikes. |
Key Features
| Feature | Design Value |
|---|---|
| Direct SE/NE555 replacement | Pin-compatible with standard 555 in SOIC-8; same pinout and functional behavior with improved specs. |
| No supply crowbarring | Eliminates 300–400mA supply transients during output switching - removes need for local 100nF bypass cap. |
| Ultra-low input bias | 20pA max trigger/threshold currents enable RC time constants up to hours using 10MΩ/100µF networks. |
| Rail-to-rail CMOS output | VOH ≈ VDD − 0.4V and VOL ≈ 0.4V at full load - ensures clean logic interfacing without external level shifters. |
| Wide supply range | Functional operation from 2V (single-cell LiFePO₄) to 18V (industrial 15V rails) - simplifies multi-voltage system integration. |
Applications
| Precision Time-Delay Generator | Pulse Width Modulation (PWM) Controller |
|---|---|
Use Scenario: Generating accurate, repeatable delays (e.g., 10ms–10s) for microcontroller wake-up sequencing or sensor sampling intervals. IC Role / Device Role / Timing Role: Monostable one-shot timer triggered by external event; controls duration via RA and C. Use Value: ±2% timing accuracy and 0.005%/°C drift ensure consistent delay across temperature and supply variation without recalibration. | Use Scenario: Creating variable-duty-cycle square waves for LED dimming or motor speed control in battery-powered devices. IC Role / Device Role / Timing Role: Astable multivibrator with independent RA/RB/C control of frequency and duty cycle. Use Value: 1MHz max frequency and rail-to-rail output enable efficient, low-noise PWM drive without external buffers. |
| Missing Pulse Detector | Sequential Timing Sequencer |
Use Scenario: Monitoring periodic signals (e.g., encoder pulses) and asserting fault flag if inter-pulse interval exceeds threshold. IC Role / Device Role / Timing Role: Monostable retriggerable timer where incoming pulses reset the delay; output goes low only on timeout. Use Value: 20pA input current prevents false triggering from leakage in high-impedance signal paths. | Use Scenario: Driving cascaded logic stages (e.g., 74HC164 shift register) with precisely timed clock enable windows. IC Role / Device Role / Timing Role: Multi-stage astable/monostable chain using multiple ICM7555s or ICM7556 dual timers. Use Value: Independent reset and discharge pins allow synchronous start/stop of sequential events without external glue logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar timer IC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC555CP | TI CMOS 555 in PDIP-8; 100µA supply current at 15V; 50pA input current; 2.5V–16V range. | Higher supply current and input leakage reduce maximum RC time constant vs. ICM7555CBA. | Select when legacy through-hole assembly or TI ecosystem compatibility is required. |
| NE555P | Bipolar 555 in PDIP-8; 10mA supply current; 600nA input current; 4.5V–16V range; requires supply decoupling. | Large crowbar currents and lower accuracy limit use in low-power or precision timing applications. | Select only for cost-sensitive, non-critical timing where PCB space and power are not constrained. |
Compared with TLC555CP and NE555P, the ICM7555CBA offers the lowest supply current (60µA), tightest input leakage (20pA), widest supply range (2–18V), and eliminates mandatory decoupling - making it optimal for modern low-power, high-accuracy timing designs in SOIC-8 footprint.
Availability
ICM7555CBA is available at Aetrix Electronics and suitable for precision timing, pulse generation, time-delay generation, and missing-pulse detection requiring stable component supply across industrial, medical, and consumer electronics programs.
Supply support for ICM7555CBA 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 ICM7555CBA belongs to Renesas' precision timer IC product line, engineered to replace legacy bipolar 555s with CMOS efficiency, accuracy, and reliability for next-generation timing-critical systems.
FAQ
What is the operating temperature range for the ICM7555CBA?
The ICM7555CBA is specified for operation from 0°C to +70°C, as indicated by the "C" suffix in its part number and confirmed in the Ordering Information table of FN2867 Rev.10.01. This commercial-grade range suits indoor consumer, office, and industrial control applications where ambient conditions remain within standard environmental limits. The device's timing stability remains within ±2% across this full range.
Does the ICM7555CBA require a decoupling capacitor on the VDD pin?
No, the ICM7555CBA does not require a VDD decoupling capacitor in most applications. Its CMOS architecture produces only 2–3mA supply transients during output transitions - unlike bipolar 555s that generate 300–400mA spikes. The datasheet explicitly states supply decoupling is "normally not necessary," and layout examples omit it. However, use one in noisy environments or when sharing VDD with high-current circuits.
Can the ICM7555CBA be used as a drop-in replacement for the NE555 in existing designs?
Yes, the ICM7555CBA is a pin-compatible, functionally equivalent drop-in replacement for the NE555 in SOIC-8 layouts. Its identical pinout, same trigger/threshold/reset logic, and rail-to-rail output behavior allow direct substitution. Designers gain immediate benefits: lower power, higher accuracy, wider supply range, and elimination of Control Voltage decoupling caps - with no PCB changes required.
What is the maximum frequency achievable with the ICM7555CBA in astable mode?
The ICM7555CBA achieves a maximum oscillator frequency of 1MHz under test conditions of VDD = 5V, RA = 470Ω, RB = 270Ω, and C = 200pF, as specified in the Electrical Specifications table (Note 7). This represents the upper practical limit for stable, low-distortion square-wave generation. For reliable long-term operation, design margins recommend staying ≤800kHz with appropriate component derating.
How does the Reset pin function on the ICM7555CBA compared to the NE555?
The ICM7555CBA Reset pin functions identically to the NE555 in logic (active-low, dominant over Trigger/Threshold), but with improved electrical behavior: it presents extremely high input impedance (~100MΩ) and a stable ~0.7V trip point across all supply voltages. Unlike the bipolar NE555, it avoids slow-fall-edge metastability issues because it controls only the internal flip-flop - ensuring clean, deterministic reset action without external hysteresis.
ICM7555CBA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for ICM7555CBA through Aetrix?
Please submit a Request for Quotation (RFQ) for ICM7555CBA 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 reliable?
The price and inventory of ICM7555CBA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICM7555CBA is usually 5 days.
3.What payment methods are accepted for ICM7555CBA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICM7555CBA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICM7555CBA?
ICM7555CBA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICM7555CBA 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?
For technical support, including ICM7555CBA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICM7555CBA requirements.
6.How does Aetrix verify that ICM7555CBA is sourced from the original manufacturer or authorized distributors?
All ICM7555CBA 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 meets industry standards.
7.What is the process for return or replacement of ICM7555CBA?
All ICM7555CBA units undergo pre-shipment inspection (PSI). If there is an issue with ICM7555CBA, 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 part is unused and in its original packaging.
Return procedure for ICM7555CBA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ICM7555CBA 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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