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Infineon Technologies CY7B952-SXC
- Part No.:
- CY7B952-SXC
- Manufacturer:
- Infineon Technologies
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY7B952-SXC.pdf
- Description:
- IC TRANSCEIVER FULL 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,449
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Product details
Overview
CY7B952-SXC from Cypress Semiconductor is a SONET/SDH serial transceiver IC supporting OC-3 (155.52 MHz) and OC-1 (51.84 MHz) data rates with integrated clock/data recovery (CDR), 8× frequency multiplication, differential ECL 100K I/O, ±1% frequency agility, and compliance with Bellcore GR-253-Core and ITU-T G.958. It serves as the physical layer interface in telecom line cards and ATM edge equipment.
For engineers reviewing the CY7B952-SXC datasheet, CY7B952-SXC pinout, CY7B952-SXC application, or CY7B952-SXC equivalent, key selection criteria include jitter generation (<0.01 UI), REFCLK×8 multiplication accuracy, LFI/CD control logic, loop-back test capability, and SOIC-24 compatibility with fiber-optic and copper media interfaces.
Technical Context
The CY7B952-SXC integrates two independent PLLs: a receive CDR PLL that recovers RCLK± and RSER± from RIN± at 51.84 or 155.52 MHz, and a transmit PLL that multiplies REFCLK± by 8 to generate TCLK±. Both PLLs are synchronized to the same REFCLK source and share MODE-driven frequency selection.
Its three-level MODE pin configures operation for STS-1 (51.84 MHz), STS-3 (155.52 MHz), or factory test mode; FC± pins connect external 301kΩ ±1% resistor and 1µF ±10% capacitor for PLL loop damping; LFI output reflects real-time lock status via CD input, transition detection, and OOL monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 51.84 MHz (STS-1) or 155.52 MHz (STS-3); selectable via MODE pin - enables dual-rate deployment without hardware change. |
| Jitter Generation | <0.01 UI - meets Bellcore GR-253-Core requirement for OC-3 line interface stability. |
| REFCLK Multiplication | ×8 fixed ratio - allows low-cost 6.48 MHz or 19.44 MHz crystal sources to drive full-rate transmission. |
| I/O Standard | ECL 100K (VCC-referenced) - supports direct connection to optical drivers and coaxial/twisted-pair media without level-shifting. |
| Power Supply | +5 V single supply - simplifies power design; operating current <70 mA reduces thermal load in dense line cards. |
| Frequency Agility | ±1% - accommodates crystal tolerance and temperature drift while maintaining lock under GR-253-compliant jitter transfer. |
| Input Sensitivity | 50 mV differential minimum on RIN±/TSER± - eliminates need for external pre-amplifiers with low-swing PECL sources. |
Pinout & Package
Package: 24-pin SOIC (Small Outline Integrated Circuit), surface-mount, JEDEC MS-013AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RIN± | Differential Receive Input | Direct interface to optical module or copper line receiver; no external buffering required; wide common-mode range (2.5 V). |
| RSER±, RCLK± | Differential Recovered Data/Clock Outputs | Aligned ECL 100K outputs synchronized to recovered bit stream; timing compatible with downstream framer or mapper ICs. |
| TSER± | Differential Transmit Input | Accepts upstream serial data; rebuffered to TOUT±; supports loop-back testing when MODE/LOOP configured. |
| TOUT±, TCLK± | Differential Transmit Output / Clock | Drive low-impedance media directly; TCLK± provides bit-rate clock for serializer or multiplexer timing. |
| REFCLK± | Differential/TTL Reference Clock Input | Configurable as PECL or TTL input; multiplied ×8 internally to set center frequency for both PLLs. |
| CD, LFI, LOOP, MODE | Control Logic Inputs/Outputs | Enable carrier detection, link fault reporting, internal loop-back, and dual-rate selection - all TTL/ECL compatible. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated CDR + Frequency Multiplier | Single-chip solution replaces discrete PLL + buffer + mux; eliminates inter-stage skew and board-area overhead. |
| Three-Level MODE Selection | Hardware-selectable STS-1/STS-3/test modes via single pin - avoids firmware configuration and enables field rate reconfiguration. |
| Link Fault Indicator (LFI) | Combines CD status, transition density, and PLL lock state into one TTL output - simplifies LOS/LOF monitoring in NMS systems. |
| Power-Down Control | Individual shutdown of receive/transmit PLLs by floating or tying RSER±/RCLK± or TCLK± to VCC - reduces idle power and crosstalk. |
| FC± Loop Filter Interface | External RC network (301kΩ + 1µF) sets PLL bandwidth and damping - enables tuning for specific jitter transfer requirements per GR-253. |
Applications
| OC-3 Line Interface Card | ATM Edge Concentrator |
|---|---|
Use Scenario: Telecom central office line card interfacing with OC-3 fiber links carrying DS3 or ATM cells. IC Role / Device Role / Timing Role: Physical layer transceiver performing clock/data recovery, jitter filtering, and transmit re-timing at 155.52 MHz. Use Value: Meets Bellcore GR-253 jitter specs without external jitter cleaners; reduces BOM count by integrating CDR and ×8 PLL. |
Use Scenario: Aggregation node converting multiple DS1/DS3 streams into ATM cells for backbone transport. IC Role / Device Role / Timing Role: Serial interface bridging framer output to optical PHY; provides stable TCLK± for cell segmentation timing. Use Value: REFCLK×8 multiplication enables use of low-cost 19.44 MHz crystals instead of 155.52 MHz oscillators - cuts timing subsystem cost by >40%. |
| SONET Add-Drop Multiplexer (ADM) | Test & Measurement Equipment |
Use Scenario: Field-deployable ADM supporting drop-and-insert of VT1.5/VT2 tributaries over OC-3 line. IC Role / Device Role / Timing Role: Dual-role transceiver handling both line-side CDR and path-side transmit buffering with loop-back support. Use Value: LOOP and MODE pins enable in-system verification of receive lock and transmit integrity without external pattern generators. |
Use Scenario: Bit-error-rate tester (BERT) front-end module validating OC-3 signal integrity and jitter compliance. IC Role / Device Role / Timing Role: Reference CDR for golden clock recovery; LFI and CD signals feed automated pass/fail decision logic. Use Value: Built-in jitter generation <0.01 UI and jitter tolerance per G.958 allow direct comparison against compliance masks in real time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SONET/SDH transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PMC-Sierra PM5343STXC | Same 24-pin SOIC package; requires external loop filter components; no integrated LFI logic - relies on host processor for fault detection. | Used in legacy PMC-based SONET framers; lacks native CD/LFI integration - increases software overhead for LOS handling. | Select when migrating from existing PMC designs or when tighter jitter transfer tuning is needed via discrete filter. |
| Exar XR22061ILF | Supports OC-3 only (no STS-1 mode); uses LVPECL I/O (3.3 V) vs. CY7B952's ECL 100K (5 V); lower power (45 mA) but no MODE-driven dual-rate flexibility. | Targeted at newer 3.3 V systems with space-constrained layouts; incompatible with legacy 5 V PECL backplanes. | Select for new 3.3 V designs prioritizing power efficiency over multi-rate field reconfiguration. |
Compared with PM5343STXC and XR22061ILF, the CY7B952-SXC uniquely combines dual-rate hardware selection, integrated LFI/CD logic, and 5 V ECL 100K drive strength - making it optimal for retrofitting legacy OC-1/OC-3 line cards requiring minimal system-level changes.
Availability
CY7B952-SXC is available at Aetrix Electronics and suitable for OC-3 line interface cards, ATM edge concentrators, and SONET add-drop multiplexers requiring stable component supply across extended product lifecycles.
Supply support for CY7B952-SXC 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
Cypress Semiconductor (now part of Infineon Technologies) is a U.S.-based semiconductor company specializing in programmable systems-on-chip, memory, and interface solutions for communications and industrial markets.
The CY7B952 belongs to Cypress's SST™ SONET/SDH Transceiver product line, designed specifically for carrier-grade optical transport equipment requiring deterministic jitter performance and multi-standard interoperability.
FAQ
What reference clock frequencies are supported for OC-3 and OC-1 operation?
The CY7B952-SXC requires a 19.44 MHz ±1% REFCLK for OC-3 (155.52 MHz) operation and a 6.48 MHz ±1% REFCLK for OC-1 (51.84 MHz) operation. Both are multiplied internally by 8. The MODE pin selects between these two modes, and REFCLK must be applied differentially (REFCLK±) or as a single-ended TTL signal on either pin.
How does the Link Fault Indicator (LFI) determine fault conditions?
LFI asserts LOW when any of three conditions occur: Carrier Detect (CD) is pulled low, the internal transition detector identifies insufficient data transitions on RIN±, or the Out-of-Lock (OOL) circuit detects frequency deviation beyond ±1000 ppm. When CD is TTL LOW, LFI responds only to OOL - enabling selective fault masking in hybrid systems.
Can the CY7B952-SXC operate with a single-ended TTL clock source?
Yes. When either REFCLK+ or REFCLK– is held at TTL LOW, the other pin becomes a single-ended TTL input. This allows direct connection to low-cost 6.48 MHz or 19.44 MHz TTL crystal oscillators without level-shifting circuitry - verified in Section 5 of the Rev. *E datasheet.
What is the purpose of the FC± pins and what external components are required?
FC± connects to an external RC network that sets the loop bandwidth and damping factor of the receive CDR PLL. A 301 kΩ ±1% resistor and 1 µF ±10% non-polar capacitor must be placed in parallel and mounted as close as possible to the FC± pins on the PCB to meet Bellcore jitter transfer specifications.
CY7B952-SXC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Transceiver
- Protocol:
- -
- Number of Drivers/Receivers:
- -
- Duplex:
- Full
- Receiver Hysteresis:
- -
- Data Rate:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
CY7B952-SXC FAQ
1.How can I place an order for CY7B952-SXC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7B952-SXC 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 CY7B952-SXC reliable?
The price and inventory of CY7B952-SXC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7B952-SXC is usually 5 days.
3.What payment methods are accepted for CY7B952-SXC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7B952-SXC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7B952-SXC?
CY7B952-SXC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7B952-SXC 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 CY7B952-SXC?
For technical support, including CY7B952-SXC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7B952-SXC requirements.
6.How does Aetrix verify that CY7B952-SXC is sourced from the original manufacturer or authorized distributors?
All CY7B952-SXC 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 CY7B952-SXC meets industry standards.
7.What is the process for return or replacement of CY7B952-SXC?
All CY7B952-SXC units undergo pre-shipment inspection (PSI). If there is an issue with CY7B952-SXC, 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 CY7B952-SXC part is unused and in its original packaging.
Return procedure for CY7B952-SXC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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