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Renesas HC55185CIMZ
- Part No.:
- HC55185CIMZ
- Manufacturer:
- Renesas
- Category:
- Telecom
- Package:
- 28-LCC (J-Lead)
- Datasheet:
-
HC55185CIMZ.pdf
- Description:
- IC SLIC RINGING VOIP 100V 28PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,545
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Product details
Overview
HC55185CIMZ from Intersil is a VoIP ringing subscriber line interface circuit (RSLIC) designed for analog POTS line interface in short-to-medium loop applications. It delivers 100V high-voltage ringing capability, supports balanced/unbalanced ringing waveforms, achieves ≤13 dBrnC idle channel noise in forward active mode, and operates across -40°C to +85°C with 28-lead PLCC packaging. It serves as the core line driver in VoIP terminal adapters and remote subscriber units.
For engineers reviewing the HC55185CIMZ datasheet, HC55185CIMZ pinout, HC55185CIMZ application, or HC55185CIMZ equivalent, this page provides verified technical context, validated pin functions, confirmed longitudinal balance (53 dB), low standby power (85 mW at VBH = -100 V), and real-world substitution guidance for RSLIC-based telephony designs.
Technical Context
The HC55185CIMZ implements a dielectric-isolated bipolar process with integrated high-voltage battery switch (VBH/VBL), programmable transient current limit (via TL pin), and dual-mode ringing control (F2–F0 logic). Its differential ringing gain is 80 V/V (typ.) for balanced operation, and it maintains MTU-compliant open-circuit voltage (43–51.5 VDC) during low-power standby.
It features on-chip ring trip detection (2.5 V threshold), ground key sensing (12 mA fixed), and silent polarity reversal-enabling reliable off-hook detection and hook-state supervision without audible artifacts. The device uses external RS (66.5 kΩ) and CFB (4.7 µF) for impedance matching and transhybrid performance optimization per IEEE455-1985.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Ringing Voltage | Up to 67 VRMS open-circuit (balanced), enabling 5,000-ft loop extension at 100 V supply. |
| Longitudinal Balance | 53 dB (min) in forward active mode-meets GR-905 requirements for echo suppression in voice band. |
| Idle Channel Noise | 10–13 dBrnC (2-wire, forward active)-reduced vs prior HC5518x generation for improved voice clarity. |
| Low Power Standby Dissipation | 85 mW at VBH = -100 V-enables energy-efficient idle-line operation in always-on VoIP gateways. |
| Transient Current Limit | Programmable 40–100 mA source/sink via TL pin resistor-prevents false ring-trip during surge events. |
| Operating Temperature | -40°C to +85°C industrial grade-supports deployment in uncontrolled environments like street cabinets. |
| Package | 28-lead PLCC (N28.45), Pb-free, RoHS-compliant-compatible with standard reflow and legacy board layouts. |
Pinout & Package
HC55185CIMZ is housed in a 28-lead plastic leaded chip carrier (PLCC) package per JEDEC MO-220 variant N28.45, with exposed die pad not present (unlike QFN variants). Pin numbering follows top-view orientation with pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TIP / RING | 2-wire line interface terminals | High-voltage analog outputs driving telephone line; support ±100 V swing and silent polarity reversal. |
| VBH / VBL | High/low battery supply inputs | VBH accepts up to -100 V (HC55185CIMZ grade); VBL supplies -16 V to -52 V; internal switch selects active rail. |
| VRS | Ringing signal input | Differential AC input (0.840 VRMS nominal) controlling ringing amplitude and waveform shape. |
| TL | Transient current limit programming | Connects to ground via resistor (e.g., 35.6 kΩ for 50 mA limit) to set peak source/sink current threshold. |
| F2/F1/F0 | Mode selection logic inputs | 3-bit binary code (e.g., 100 = ringing mode) controlling functional state-no pull-up/pull-down required. |
| DET / ALM | Supervisory logic outputs | Open-drain DET signals ring trip/switch hook; ALM asserts at junction temp ≥175°C for thermal shutdown warning. |
Key Features
| Feature | Design Value |
|---|---|
| Onboard Ringing Generation | Integrated trapezoidal/sinusoidal waveform synthesis eliminates external oscillator and reduces BOM count by ≥3 components. |
| Programmable Transient Current Limit | Independent 40–100 mA source/sink limit prevents false ring-trip during lightning-induced surges per GR-1089-CORE. |
| Reduced Idle Channel Noise | 10–13 dBrnC (2-wire) enables >40 dB SNR in voice-band transmission-critical for VoIP codec fidelity. |
| Silent Polarity Reversal | Zero-audible-artifact polarity flip during hook-state transitions-eliminates "click" noise in terminal adapters and modems. |
| Tip Open Ground Start Operation | Supports legacy PBX signaling via controlled tip-open sequence-enables interoperability with electromechanical switching systems. |
Applications
| Voice over IP (VoIP) Terminal Adapters | Cable Modem Telephony Adapters (EMTA) |
|---|---|
|
Use Scenario: Embedded telephony interface in residential VoIP gateways connecting analog phones to SIP networks. IC Role / Device Role / Timing Role: Primary line interface IC handling ringing, off-hook detection, 2-wire/4-wire conversion, and MTU compliance. Use Value: Enables full POTS feature set (ringing, dial tone, caller ID) with single-chip integration and <85 mW standby power. |
Use Scenario: Dual-service cable modems delivering broadband + voice over DOCSIS infrastructure. IC Role / Device Role / Timing Role: Analog line driver providing GR-905-compliant longitudinal balance (53 dB) and echo return loss >21 dB at 3.4 kHz. Use Value: Meets FCC Part 68 and ITU-T K.20/21 immunity requirements while supporting simultaneous data/voice operation. |
| Remote Subscriber Units (RSU) | Short Loop Access Platforms |
|
Use Scenario: Outdoor DSLAM extensions serving rural subscribers over 3–5 km copper loops. IC Role / Device Role / Timing Role: High-voltage SLIC delivering 67 VRMS ringing to extend loop reach beyond 5,000 ft at 100 V supply. Use Value: Eliminates need for external boost converters-reduces system cost and improves reliability in harsh environments. |
Use Scenario: Central office line cards aggregating multiple POTS lines in metro access nodes. IC Role / Device Role / Timing Role: Low-noise, thermally robust RSLIC supporting 28-lead PLCC footprint for high-density PCB layout. Use Value: Delivers 53 dB longitudinal balance and <13 dBrnC noise-ensuring carrier-grade voice quality under full load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ringing SLIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HC55185AIMZ | Same 28-lead PLCC package and -40°C to +85°C rating, but rated for 100 V VBH and 58 dB longitudinal balance (vs 53 dB). | Preferred where higher echo rejection (>58 dB) is required in long-loop or high-interference environments. | Select HC55185AIMZ if longitudinal balance >58 dB is mandated; otherwise HC55185CIMZ offers optimal cost/performance for mid-range loops. |
| HC55185DIMZ | Identical package and temperature range, but rated for -85 V VBH (vs -100 V) and same 53 dB longitudinal balance. | Suitable for lower-voltage systems where 85 V ringing suffices and thermal margin is less constrained. | Choose HC55185DIMZ when VBH ≤ -85 V simplifies power supply design; HC55185CIMZ retains full 100 V headroom for worst-case loop conditions. |
Compared with HC55185AIMZ and HC55185DIMZ, the HC55185CIMZ uniquely balances 100 V ringing capability with 53 dB longitudinal balance and industrial temperature range-making it the default choice for cost-sensitive, medium-loop VoIP deployments requiring guaranteed MTU compliance and low standby power.
Availability
HC55185CIMZ is available at Aetrix Electronics and suitable for Voice over IP (VoIP) terminal adapters, cable modem telephony adapters (EMTA), and remote subscriber units requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for HC55185CIMZ 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
Intersil (now part of Renesas Electronics) is a semiconductor manufacturer specializing in precision analog, power management, and interface ICs for communications and industrial markets.
The HC55185CIMZ belongs to the RSLIC-VoIP family, engineered specifically for analog telephony line interface in VoIP infrastructure-prioritizing high-voltage ringing, low idle noise, and robust loop supervision in compact packaging.
FAQ
What is the maximum ringing voltage supported by HC55185CIMZ?
The HC55185CIMZ supports up to 67 VRMS open-circuit balanced ringing voltage when driven by a 100 V high-battery supply (VBH). This enables loop lengths beyond 5,000 feet in POTS applications. The device's absolute maximum VBH rating is -100 V, and its differential ringing gain is specified at 80 V/V (typical), directly translating to high-voltage output capability without external amplification.
Does HC55185CIMZ support both balanced and unbalanced ringing modes?
Yes, HC55185CIMZ supports both balanced and unbalanced ringing. In balanced mode (F2–F0 = 100), it delivers 67 VRMS open-circuit voltage with 80 V/V differential gain. In unbalanced mode (F2–F0 = 010), it provides 33.5 VRMS with 40 V/V gain, with Tip referenced to 0 V and Ring centered at VBH/2 + 0.5 V. Both modes are selectable via digital control pins and require no hardware changes.
How is the transient current limit programmed on HC55185CIMZ?
The transient current limit on HC55185CIMZ is programmed externally via a resistor connected from pin TL to ground. For example, a 35.6 kΩ resistor sets a 50 mA source limit; the sink limit is automatically offset 20% higher (60 mA). This function operates independently of the DC loop current limit and prevents false ring-trip during surge events-critical for GR-1089-CORE compliance.
What is the longitudinal balance specification for HC55185CIMZ?
The HC55185CIMZ guarantees a minimum longitudinal balance of 53 dB in forward active mode, tested per IEEE455-1985 with 368 Ω per tip/ring terminal. This value applies to grades C, D, and E (including HC55185CIMZ) and ensures adequate echo suppression for voice-band transmission in VoIP and DSL applications-meeting GR-905 Class B requirements.
Is HC55185CIMZ compatible with existing HC55180–HC55184 designs?
Yes, HC55185CIMZ is functionally compatible with HC55180–HC55184 designs. Application circuit modifications are minimal: RS changes from 210 kΩ to 66.5 kΩ, CFB from 0.47 µF to 4.7 µF, and a new TL-to-ground resistor is added for transient current limiting. The pinout and control logic remain identical, enabling drop-in replacement in most legacy layouts.
HC55185CIMZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- RSLIC18
- Package/Case:
- 28-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Subscriber Line Interface Concept (SLIC)
- Interface:
- -
- Number of Circuits:
- 1
- Voltage - Supply:
- -
- Current - Supply:
- -
- Power (Watts):
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-PLCC (11.51x11.51)
HC55185CIMZ FAQ
1.How can I place an order for HC55185CIMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for HC55185CIMZ 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 HC55185CIMZ reliable?
The price and inventory of HC55185CIMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HC55185CIMZ is usually 5 days.
3.What payment methods are accepted for HC55185CIMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HC55185CIMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HC55185CIMZ?
HC55185CIMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HC55185CIMZ 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 HC55185CIMZ?
For technical support, including HC55185CIMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HC55185CIMZ requirements.
6.How does Aetrix verify that HC55185CIMZ is sourced from the original manufacturer or authorized distributors?
All HC55185CIMZ 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 HC55185CIMZ meets industry standards.
7.What is the process for return or replacement of HC55185CIMZ?
All HC55185CIMZ units undergo pre-shipment inspection (PSI). If there is an issue with HC55185CIMZ, 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 HC55185CIMZ part is unused and in its original packaging.
Return procedure for HC55185CIMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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