My Inquiry
My Account
Renesas ISL1557IUEZ
- Part No.:
- ISL1557IUEZ
- Manufacturer:
- Renesas
- Category:
- Telecom
- Package:
- 10-VFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
ISL1557IUEZ.pdf
- Description:
- IC TELECOM INTERFACE 10HMSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,328
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ISL1557IUEZ from Renesas Electronics is a dual current-feedback operational amplifier engineered for ADSL2+ and VDSL2 line driving in DMT-based CPE modems. It delivers 750mA output current from a single +12V supply, achieves –80dBc distortion at 150kHz into 25Ω, and operates across –40°C to +85°C. Its role is differential signal amplification in DSL transceivers with enhanced lightning transient protection.
For engineers reviewing the ISL1557IUEZ datasheet, ISL1557IUEZ pinout, ISL1557IUEZ application, or ISL1557IUEZ equivalent, key selection criteria include its 300MHz bandwidth, programmable bias via C0/C1 pins, 21dBm output power capability, thermal shutdown, and HMSOP-10 package compatibility with single-supply DSL line driver designs.
Technical Context
The ISL1557IUEZ implements a dual current-feedback amplifier architecture optimized for high-speed DSL line driving. Its closed-loop bandwidth is resistor-tunable (e.g., 250MHz at RF = 750Ω, AV = +5), and it supports three bias modes-full (15mA/amplifier), medium (11mA), and low (6mA)-via dedicated C0 and C1 control pins to match power/performance trade-offs per DSL standard.
It features enhanced output clamps for lightning transient immunity, operates exclusively in single-supply mode (4.5V–12V), and requires VS− connected to the thermal pad. Input common-mode range and output swing are specified for transformer-coupled differential drive configurations typical in ADSL/VDSL CPE front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5V to 12V single supply - enables direct integration into compact DSL modem power rails without dual-rail generation. |
| Output Current | 750mA continuous - sufficient to drive 21dBm (125mW) into 100Ω line with transformer coupling per ITU-T G.993.2. |
| Bandwidth | 300MHz (RF = 499Ω, AV = +5) - supports full VDSL2 frequency band up to 30MHz with margin for group delay flatness. |
| THD @ 150kHz | –80dBc typical into 25Ω - meets stringent spectral mask requirements for upstream VDSL2 transmission. |
| Quiescent Current | 6mA per amplifier (low-bias mode) - reduces thermal load and enables dynamic power scaling during idle/low-data-rate states. |
| Package | 10-lead HMSOP with exposed thermal pad - provides superior thermal resistance (θJA = +62°C/W) for sustained high-power line driving. |
| Operating Temp | –40°C to +85°C - qualified for deployment in uncontrolled residential CPE environments including attic or garage installations. |
Pinout & Package
The ISL1557IUEZ is housed in a 10-lead Heat-Sink MSOP (HMSOP) package (MDP0050) with an exposed thermal pad that must be soldered to VS− for thermal and electrical integrity. This package is rated for single-supply operation only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VS+ | Positive supply input - accepts 4.5V–12V; bypassing with 4.7µF + 0.1µF required for stability. |
| 2 | INA− | Inverting input of Amplifier A - virtual ground node in inverting configuration; sensitive to stray capacitance. |
| 3 | INA+ | Non-inverting input of Amplifier A - sets common-mode bias point for differential pair input stage. |
| 4 | Thermal Pad | VS− connection - mandatory for thermal dissipation and internal bias reference; must be soldered to PCB ground plane tied to VS−. |
| 5 | C0 | Bias control pin A - selects amplifier bias current level (0V = low, 5V = full) for power/performance tuning. |
| 6 | C1 | Bias control pin B - used with C0 to configure four discrete bias states (full/medium/low/power-down). |
| 7 | INB+ | Non-inverting input of Amplifier B - forms second half of differential line driver pair with Amplifier A. |
| 8 | INB− | Inverting input of Amplifier B - complements INB+ to establish balanced differential input path. |
| 9 | OUTB | Output of Amplifier B - drives one side of transformer-coupled DSL line; paired with OUTA for true differential output. |
| 10 | OUTA | Output of Amplifier A - drives opposite side of line transformer; combined with OUTB delivers 20VP-P differential swing into 21Ω. |
Key Features
| Feature | Design Value |
|---|---|
| Dual current-feedback architecture | Enables wide bandwidth independent of closed-loop gain - simplifies design of flat-response DSL drivers across 1–30MHz. |
| Programmable bias via C0/C1 | Four discrete operating modes (full/medium/low/power-down) allow real-time adaptation to DSL profile (e.g., ADSL2+ vs VDSL2). |
| Enhanced output clamping | Integrated protection circuitry withstands lightning-induced transients per IEC 61000-4-5 Level 3 without external TVS diodes. |
| 21dBm output power capability | Meets ITU-T G.993.2 Class B line power requirement for VDSL2 30a profiles using standard 1:2 line transformers. |
| Thermal shutdown | Automatically disables outputs if junction temperature exceeds +150°C - prevents latch-up or permanent damage during overload or poor heatsinking. |
Applications
| VDSL2 Line Driver | ADSL2+ CPE Modem |
|---|---|
|
Use Scenario: High-speed broadband access over existing copper telephone lines up to 100Mbps downstream using VDSL2 30a profile. IC Role / Device Role / Timing Role: Differential line driver amplifying baseband DMT symbols prior to transformer coupling onto twisted-pair line. Use Value: Delivers 20VP-P differential swing into 21Ω while maintaining –82dBc THD at 10MHz - ensures compliance with spectral emission masks and BER <1E–7. |
Use Scenario: Residential DSL modem supporting ADSL2+ Annex A/M with 24Mbps downstream capability. IC Role / Device Role / Timing Role: Dual-channel line driver providing complementary outputs for transformer-balanced line interface. Use Value: Achieves –85dBc distortion at 7.1mA supply current - extends modem battery backup time and reduces thermal footprint on PCB. |
| G.SHDSL Line Driver | HDSL2 Repeater |
|
Use Scenario: Symmetric DSL equipment delivering 2.3Mbps over distances up to 3.5km using TCM-coded signals. IC Role / Device Role / Timing Role: High-fidelity analog driver reconstructing multi-level PAM-32 waveforms after digital-to-analog conversion. Use Value: 300MHz bandwidth and 750V/µs slew rate preserve signal edge integrity across 2.3MHz baseband - minimizes intersymbol interference. |
Use Scenario: Mid-span repeater boosting HDSL2 signals over extended loop lengths (>4km) in business-class leased-line deployments. IC Role / Device Role / Timing Role: Low-noise, high-output-current amplifier compensating for line attenuation and crosstalk-induced loss. Use Value: Thermal shutdown and robust output clamps ensure uninterrupted operation under lightning surge events common in outdoor plant environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DSL line driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL1557AIRZ | 16-lead QFN package; supports ±2.25V to ±6V dual supply or 4.5V–12V single supply; lower θJA (+52°C/W). | Preferred for space-constrained, thermally demanding dual-supply designs or when board layout allows larger QFN footprint. | Select ISL1557AIRZ when thermal performance is critical and dual-supply operation is acceptable; not drop-in compatible with ISL1557IUEZ due to different pin count and layout. |
| MAX13212 | Single-channel, 200MHz bandwidth, –78dBc THD at 10MHz, 5.5V max supply; no C0/C1 bias control. | Suitable for cost-sensitive, lower-power ADSL2+ designs where full VDSL2 bandwidth and programmable bias are unnecessary. | Choose MAX13212 only for single-port, non-VDSL2 applications requiring minimal BOM count; lacks differential drive capability and thermal pad grounding scheme of ISL1557IUEZ. |
Compared with ISL1557AIRZ and MAX13212, the ISL1557IUEZ uniquely combines HMSOP-10 single-supply operation, C0/C1 programmable bias, and integrated lightning protection - making it the sole option for compact, thermally managed, standards-compliant VDSL2 CPE line drivers requiring field-reliable transient immunity.
Availability
ISL1557IUEZ is available at Aetrix Electronics and suitable for ADSL2+, VDSL2, G.SHDSL, and HDSL2 line driver applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for ISL1557IUEZ 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 specializing in microcontrollers, analog, power, and mixed-signal ICs for industrial, automotive, and communications infrastructure.
The ISL1557IUEZ belongs to Renesas' high-speed line driver product line, designed specifically for DSL physical layer (PHY) implementations where low distortion, programmable power, and ruggedized output protection are mandatory.
FAQ
What is the maximum output voltage swing of the ISL1557IUEZ in differential mode?
The ISL1557IUEZ delivers a typical 20VP-P differential output swing into a 21Ω load when operated from a +12V supply. This specification is validated per the datasheet's Electrical Specifications table under "OUTPUT CHARACTERISTICS" and directly supports 21dBm line power requirements for VDSL2 Class B profiles. The ISL1557IUEZ achieves this while maintaining –80dBc THD at 150kHz, confirming its suitability for high-fidelity DSL signal transmission.
Does the ISL1557IUEZ support dual-supply operation?
No, the ISL1557IUEZ is specified for single-supply operation only (4.5V to 12V). Its HMSOP-10 package and internal bias architecture require VS− to be connected to the exposed thermal pad and referenced to ground or negative rail - unlike the ISL1557AIRZ variant, which supports ±2.25V to ±6V dual supplies. Attempting dual-supply use with the ISL1557IUEZ violates Absolute Maximum Ratings and may cause malfunction or damage.
How do the C0 and C1 pins affect power consumption in the ISL1557IUEZ?
The C0 and C1 pins configure four discrete bias states: full (15mA/amplifier), medium (11mA), low (6mA), and power-down (0.6–1.0mA). Applying 0V/0V sets full bias; 5V/0V selects medium; 0V/5V enables low bias; and 5V/5V forces power-down. These settings directly scale quiescent current and bandwidth - e.g., low-bias mode reduces supply current by 60% versus full bias while retaining sufficient performance for ADSL2+.
Is the ISL1557IUEZ pin-compatible with other devices in the ISL1557A family?
No, the ISL1557IUEZ is not pin-compatible with the ISL1557AIRZ. The ISL1557IUEZ uses a 10-lead HMSOP package with specific pin assignments (e.g., thermal pad = VS−, pins 5/6 = C0/C1), whereas the ISL1557AIRZ uses a 16-lead QFN with different pinout, including NC pins and separate VS− terminal. PCB layout and decoupling must be redesigned when substituting between these variants.
What thermal management considerations apply to the ISL1557IUEZ?
The ISL1557IUEZ requires the exposed thermal pad to be soldered to a PCB copper pour connected to VS−. This pad is electrically and thermally critical - failure to connect it results in junction temperature exceeding +150°C under load, triggering thermal shutdown. The HMSOP-10 package has θJA = +62°C/W; for 750mA output at 12V, ≥2cm² of 2-oz copper tied to VS− is recommended to maintain safe operating temperature.
ISL1557IUEZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 10-VFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Line Interface Unit (LIU)
- Interface:
- -
- Number of Circuits:
- 2
- Voltage - Supply:
- 4.5V ~ 12V
- Current - Supply:
- 6mA
- Power (Watts):
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-HMSOP
ISL1557IUEZ FAQ
1.How can I place an order for ISL1557IUEZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL1557IUEZ 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 ISL1557IUEZ reliable?
The price and inventory of ISL1557IUEZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL1557IUEZ is usually 5 days.
3.What payment methods are accepted for ISL1557IUEZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL1557IUEZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL1557IUEZ?
ISL1557IUEZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL1557IUEZ 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 ISL1557IUEZ?
For technical support, including ISL1557IUEZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL1557IUEZ requirements.
6.How does Aetrix verify that ISL1557IUEZ is sourced from the original manufacturer or authorized distributors?
All ISL1557IUEZ 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 ISL1557IUEZ meets industry standards.
7.What is the process for return or replacement of ISL1557IUEZ?
All ISL1557IUEZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL1557IUEZ, 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 ISL1557IUEZ part is unused and in its original packaging.
Return procedure for ISL1557IUEZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL1557IUEZ Tags
-
LMC567CMX/NOPB
Texas Instruments
-
LM567CMX/NOPB
Texas Instruments
-
LM567CM/NOPB
Texas Instruments
-
VSC8531XMW-02
Microchip Technology
-
VSC8531XMW-05
Microchip Technology
-
GPY115C0VI
MaxLinear, Inc.
-
SI32185-A-FMR
Skyworks Solutions Inc.
-
VSC8541XMV-05
Microchip Technology
-
SI32178-B-FM1R
Skyworks Solutions Inc.
-
GPY215C0VI
MaxLinear, Inc.
-
CPC7514ZTR
Littelfuse Inc.
-
VSC8502XML-03
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
