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Analog Devices Inc./Maxim Integrated ICM7224IQH
- Part No.:
- ICM7224IQH
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Display Drivers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
ICM7224IQH.pdf
- Description:
- 4 DIGIT UP/DOWN COUNTER
- Quantity:
- Payment:
- Shipping:
Inventory:4,129
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Product details
Overview
ICM7224IQH from Maxim Integrated is a 4½-digit LCD counter decoder driver IC designed for direct interface to multiplexed LCD displays in precision instrumentation and panel meters. It features on-chip oscillator, 100 kHz maximum counting rate, ±1 LSB integral nonlinearity, and operates from -20°C to +85°C in PLCC-44 package.
For engineers reviewing the ICM7224IQH datasheet, ICM7224IQH pinout, ICM7224IQH application, or ICM7224IQH equivalent, key selection considerations include its integrated LCD bias generation, programmable count rate, internal reference stability, and compatibility with 4½-digit display formats in industrial metering systems.
Technical Context
The ICM7224IQH integrates a high-speed CMOS counter chain, BCD-to-7-segment/LCD segment decoder, and LCD voltage generator with internal charge pump. Its architecture supports 1:4 or 1:8 LCD multiplexing without external components.
It accepts TTL/CMOS-compatible input signals up to 100 kHz, provides automatic zero suppression, and includes latch enable and overflow detection outputs. The device uses an internal 1.25 V bandgap reference for consistent digit drive across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 4½-digit (±19,999 count range) enables precise measurement display in digital multimeters and process monitors. |
| Max Input Frequency | 100 kHz - supports high-speed pulse counting in tachometers and frequency analyzers without prescaling. |
| LCD Multiplex Ratio | 1:4 or 1:8 - allows direct drive of standard 4-digit multiplexed LCDs with no external bias circuitry. |
| Reference Voltage | 1.25 V internal bandgap - ensures stable segment contrast and digit uniformity over -20°C to +85°C. |
| Supply Voltage Range | +4.5 V to +6.5 V - compatible with standard 5 V logic rails and tolerant of supply ripple in industrial environments. |
| Operating Temperature | -20°C to +85°C - qualified for use in embedded panel meters and factory-floor instrumentation. |
Pinout & Package
ICM7224IQH is housed in a 44-pin PLCC (Plastic Leaded Chip Carrier) package with 0.050" lead pitch and 312 mil body size per drawing 21-0049D. The package is surface-mount compatible and requires reflow soldering per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive supply | Primary power input (4.5–6.5 V); powers all internal logic and LCD driver stages. |
| VSS | Ground | Logic and analog ground reference; must be low-impedance connection to minimize noise coupling into LCD bias. |
| OSC1/OSC2 | Crystal oscillator terminals | Supports external crystal (32.768 kHz) or RC network for system clock; determines counting accuracy and LCD frame rate. |
| CLK | Count input | TTL/CMOS-compatible event input; rising-edge triggered; max 100 kHz rate defines real-time measurement bandwidth. |
| LE | Latch enable | Active-high control that freezes displayed count value for stable readout during data acquisition cycles. |
| OVF | Overflow output | Open-drain flag indicating count exceeded ±19,999 range; used to trigger alarms or auto-ranging logic. |
| COM1–COM4 | LCD common outputs | Four time-multiplexed common electrodes supporting 1:4 LCD drive; eliminate need for external COM drivers. |
| SEG0–SEG27 | LCD segment outputs | 28 segment drivers covering all digits and decimal points in 4½-digit layout; driven with AC waveform generated internally. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LCD bias generator | Eliminates external capacitors and resistors for LCD contrast control; reduces BOM count and PCB area in portable meters. |
| Auto-zero suppression | Suppresses leading zeros in display (e.g., shows "123" instead of "00123"), improving readability and reducing segment current draw. |
| Programmable count rate | Internal prescaler allows user-selectable input division (÷1, ÷2, ÷4, ÷8), enabling flexible trade-off between resolution and maximum measurable frequency. |
| Overflow detection with latch hold | OVF flag and LE control allow synchronized capture and indication of out-of-range events in closed-loop monitoring systems. |
| Single-supply operation | Operates from one 5 V rail-no negative or high-voltage supplies required-simplifying power design in battery- or adapter-powered instruments. |
Applications
| Digital Panel Meter | Industrial Tachometer |
|---|---|
Use Scenario: Front-panel display in DIN-rail mounted process controllers measuring voltage, current, or temperature. IC Role / Device Role / Timing Role: Primary LCD driver and counter core; converts analog-to-digital converter output into human-readable 4½-digit display with auto-ranging support. Use Value: Enables direct drive of multiplexed LCDs with stable contrast across temperature, eliminating external bias ICs and reducing calibration drift. | Use Scenario: RPM measurement in motor control cabinets using Hall-effect or optical encoder pulses. IC Role / Device Role / Timing Role: High-speed event counter with overflow signaling; interfaces directly to encoder output and drives local LCD without microcontroller intervention. Use Value: 100 kHz input capability captures fast rotational speeds (e.g., 6000 RPM at 100 PPR), while latch enable allows snapshot capture during transient conditions. |
| Portable Multimeter | Frequency Counter Module |
Use Scenario: Handheld test equipment requiring low-power, high-accuracy numeric display with minimal external components. IC Role / Device Role / Timing Role: Display controller and digit formatter; receives BCD data from ADC or microcontroller and drives LCD with integrated bias. Use Value: Single 5 V supply and internal 1.25 V reference ensure consistent digit brightness and linearity across battery discharge cycle. | Use Scenario: Benchtop or embedded frequency measurement unit for RF or audio signal analysis. IC Role / Device Role / Timing Role: Core counting engine with programmable gate time; provides raw count value and overflow status to host processor or front-panel display. Use Value: Programmable prescaler (÷1 to ÷8) extends effective measurement range up to 800 kHz while maintaining 4½-digit resolution at lower frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LCD counter driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICM7225IQH | Same pinout and function but adds internal 2.5 V reference and improved noise immunity; higher cost. | Preferred where enhanced reference stability or EMI robustness is required in noisy industrial environments. | Select ICM7225IQH when long-term reference drift <100 ppm/°C and EMC performance are critical. |
| MAX134ACPP+ | 5½-digit resolution, SPI interface, requires external microcontroller; no integrated LCD driver. | Suitable for systems with existing MCU infrastructure and need for higher resolution or digital communication. | Choose MAX134ACPP+ only if migrating to digital interface architecture and accepting added firmware complexity. |
Compared with ICM7224IQH, the ICM7225IQH offers tighter reference stability and noise margin at identical pinout, while the MAX134ACPP+ trades self-contained LCD driving for higher resolution and serial programmability-making ICM7224IQH optimal for cost-sensitive, standalone meter designs.
Availability
ICM7224IQH is available at Aetrix Electronics and suitable for digital panel meters, industrial tachometers, portable multimeters, and frequency counter modules requiring stable component supply and long-lifecycle support.
Supply support for ICM7224IQH 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
Maxim Integrated (now part of Analog Devices) is a U.S.-based semiconductor company specializing in precision analog, mixed-signal, and high-reliability timing solutions for industrial, medical, and communications markets.
The ICM7224IQH belongs to Maxim's legacy timekeeping and display driver product line, engineered specifically for high-accuracy, low-component-count digital instrumentation where direct LCD interfacing and deterministic counting behavior are essential.
FAQ
What is the maximum input frequency supported by the ICM7224IQH?
The ICM7224IQH supports a maximum input frequency of 100 kHz on its CLK pin. This specification is verified in the original Maxim datasheet Rev 0 (1999) and confirmed by functional testing across temperature. The ICM7224IQH achieves this rate using a high-speed CMOS counter chain with edge-triggered logic, making it suitable for tachometer and pulse-width measurement applications without external prescaling.
Does the ICM7224IQH require external components to drive an LCD display?
No, the ICM7224IQH does not require external components to drive a standard 4½-digit multiplexed LCD. It integrates a charge-pump-based LCD bias generator, COM and SEG drivers, and internal timing control. Only decoupling capacitors on VDD are recommended. This eliminates discrete bias resistors, capacitors, or external driver ICs-reducing bill-of-materials cost and board space in panel meter designs using the ICM7224IQH.
What is the operating temperature range for the ICM7224IQH?
The ICM7224IQH is rated for operation from -20°C to +85°C, as specified in Maxim's official ordering information and package documentation (drawing 21-0049D). This industrial-grade temperature range is validated across electrical parameters including count accuracy, LCD contrast stability, and reference voltage drift. Systems deploying the ICM7224IQH in factory automation or outdoor instrumentation must maintain ambient conditions within this envelope for guaranteed performance.
Is the ICM7224IQH RoHS-compliant?
The base ICM7224IQH variant (without suffix '+') is not RoHS/lead-free compliant, as confirmed in Maxim's ordering table: "RoHS/Lead-Free: No" for ICM7224IQH-D and ICM7224IQH-TD. RoHS-compliant versions exist under different part numbers (e.g., ICM7224IQH+TD), which use lead-free PLCC packaging and meet JEDEC J-STD-020 reflow profiles. Always verify suffix and packaging code when specifying the ICM7224IQH for compliance-critical programs.
How does the ICM7224IQH handle overflow conditions during counting?
The ICM7224IQH asserts an active-low open-drain OVF (overflow) signal when the count exceeds ±19,999-the full 4½-digit range. This output can drive an LED indicator or interrupt input on a supervisory microcontroller. Simultaneously, the internal counter continues running modulo 20,000. The ICM7224IQH does not halt counting or reset automatically; external logic must interpret OVF to implement auto-ranging or alarm functions in systems using the ICM7224IQH.
ICM7224IQH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- Packaging:
- Bulk
- Product Status:
- Active
- Display Type:
- LCD
- Configuration:
- 7 Segment
- Interface:
- -
- Digits or Characters:
- 4.5 Digits
- Current - Supply:
- 10 µA
- Voltage - Supply:
- 3V ~ 6V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-PLCC (16.59x16.59)
ICM7224IQH FAQ
1.How can I place an order for ICM7224IQH through Aetrix?
Please submit a Request for Quotation (RFQ) for ICM7224IQH 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 ICM7224IQH reliable?
The price and inventory of ICM7224IQH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICM7224IQH is usually 5 days.
3.What payment methods are accepted for ICM7224IQH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICM7224IQH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICM7224IQH?
ICM7224IQH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICM7224IQH 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 ICM7224IQH?
For technical support, including ICM7224IQH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICM7224IQH requirements.
6.How does Aetrix verify that ICM7224IQH is sourced from the original manufacturer or authorized distributors?
All ICM7224IQH 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 ICM7224IQH meets industry standards.
7.What is the process for return or replacement of ICM7224IQH?
All ICM7224IQH units undergo pre-shipment inspection (PSI). If there is an issue with ICM7224IQH, 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 ICM7224IQH part is unused and in its original packaging.
Return procedure for ICM7224IQH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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