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Infineon Technologies CY7B9945V-2AXCT
- Part No.:
- CY7B9945V-2AXCT
- Manufacturer:
- Infineon Technologies
- Package:
- 52-LQFP
- Datasheet:
-
CY7B9945V-2AXCT.pdf
- Description:
- IC CLK BUFF 52TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,682
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Product details
Overview
CY7B9945V-2AXCT from Cypress Semiconductor is a high-speed multi-phase PLL clock buffer with integrated phase-locked loop, 10+1 LVTTL outputs, 24–200 MHz operation, <200 ps output-to-output skew, and ±10.4 ns programmable phase adjustment in 625/1300 ps steps-used for timing synchronization in high-performance computing backplanes and telecom line cards.
For engineers reviewing the CY7B9945V-2AXCT datasheet, CY7B9945V-2AXCT pinout, CY7B9945V-2AXCT application, or CY7B9945V-2AXCT equivalent, key selection criteria include guaranteed 500 ps total timing budget (TTB™), fault-tolerant dual reference inputs (LVTTL/LVPECL), individual bank disable control, and industrial temperature range (–40 °C to +85 °C).
Technical Context
The CY7B9945V-2AXCT implements a fully integrated PLL with lock detection and dynamic reference switching between REFA+/− and REFB+/− pairs, supporting seamless failover without cycle loss. Its divide-and-phase select matrix enables independent configuration of two output banks (1Q[0:3], 2Q[0:5]) and feedback output QF via dedicated 3-level control pins (DS/F/DS/FBDS/FBF0).
Phase resolution is determined by FS input setting (LOW/MID/HIGH), yielding discrete time units (tU) of 1.0 ns, 0.5 ns, or 0.25 ns respectively; phase shifts are applied relative to the feedback edge, enabling precise skew alignment across all outputs referenced to a common zero-skew baseline.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Frequency Range | 24 MHz to 200 MHz - supports nominal system clocks from mid-speed control buses to high-speed SerDes reference domains. |
| Total Timing Budget (TTB™) | ≤500 ps - guarantees worst-case timing window across voltage, temperature, process, and frequency variation for deterministic system timing closure. |
| Output-to-Output Skew | <200 ps - ensures synchronous sampling across multiple ASIC/FPGA clock domains on shared PCB traces. |
| Phase Adjustment Resolution | 625 ps or 1300 ps steps - enables fine-grained deskew for trace-length-matched interfaces like DDR memory controllers or packet-switch fabric clocks. |
| Output Drive Capability | 10 + 1 LVTTL outputs driving 50 Ω terminated lines - eliminates need for external termination resistors in point-to-point clock distribution. |
| Supply Voltage | 3.3 V only - compatible with modern low-voltage logic families and simplifies power rail design vs. mixed-voltage clock ICs. |
| Operating Temperature | –40 °C to +85 °C - qualified for industrial and telecom infrastructure environments without derating. |
Pinout & Package
52-pin 1.4 mm thin quad flat package (TQFP) with exposed thermal pad (not electrically connected), optimized for high-density PCB layouts and thermal dissipation in clock-distribution-intensive systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REFA+/−, REFB+/− | Differential or single-ended reference inputs | Fault-tolerant dual-clock source interface; supports hot-insertion and dynamic switchover without PLL unlock or output glitch. |
| REFSEL | Reference pair selector | LVTTL-controlled multiplexer selecting REFA or REFB as active reference; internal pull-down enables default REFA operation. |
| FBK | Feedback clock input | Accepts QF output to close PLL loop; rising-edge alignment with REF ensures stable phase-locked operation. |
| 1Q[0:3], 2Q[0:5] | Configurable clock outputs | Two independent banks (4+6) with per-bank divider (1–12) and phase (±10.4 ns) control for multi-domain clock tree synthesis. |
| QF | Dedicated feedback output | High-fanout LVTTL buffer for PLL feedback path; configurable divider/phase to enable flexible loop ratios and jitter filtering. |
| DIS1/DIS2 | Output bank disable controls | Asynchronous LVTTL inputs disabling Bank 1 (1Q[0:3]) or Bank 2 (2Q[0:5]) to HOLD-OFF (glitch-free stop) or High-Z (test mode isolation). |
| LOCK | PLL lock status indicator | Open-drain LVTTL output asserting HIGH only after ≥32 consecutive error-free FB cycles - provides reliable lock confirmation for system boot sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed TTB™ window | 500 ps max across all PVT corners - eliminates timing margin uncertainty in high-speed system validation. |
| Programmable phase alignment | ±10.4 ns in discrete 625/1300 ps steps - enables trace-length compensation without external delay lines or FPGA-based deskew logic. |
| Fault-tolerant reference inputs | Dual differential/single-ended LVTTL/LVPECL pairs with automatic switchover - maintains clock continuity during primary source failure in redundant telecom systems. |
| Individual bank disable | DIS1/DIS2 + MODE pin control over HOLD-OFF or High-Z states - supports power gating and boundary-scan test access without board-level rework. |
| Integrated PLL with lock detect | On-chip VCO, phase detector, and lock monitor - reduces BOM count, layout area, and jitter accumulation vs. discrete PLL + buffer solutions. |
Applications
| High-Speed Computing Backplane | Telecom Line Card Synchronization |
|---|---|
|
Use Scenario: Distributing synchronized clocks across multiple processor, memory, and I/O modules on a 12-slot ATCA chassis with >15 cm trace lengths. IC Role / Device Role / Timing Role: Multi-phase clock buffer generating phase-aligned 100 MHz and 125 MHz clocks for CPU clusters and PCIe switches, with bank-specific disable for power-managed slots. Use Value: ≤200 ps inter-output skew ensures setup/hold compliance across distributed loads; TTB™ guarantee enables first-pass timing closure without iterative SI simulation. |
Use Scenario: Providing jitter-clean, phase-adjustable clocks to SERDES transceivers and framer ASICs in a 10G/40G optical line card with dual-reference redundancy. IC Role / Device Role / Timing Role: PLL-based clock generator delivering 156.25 MHz and 311.25 MHz outputs with programmable deskew to compensate for differential pair length mismatches. Use Value: Fault-tolerant REFA/REFB switchover maintains lock within 10 µs during primary clock failure - meets ITU-T G.8262 ePRTC holdover requirements. |
| Industrial Ethernet Switch Fabric | Test Equipment Clock Distribution |
|
Use Scenario: Driving 10/25/100 GbE PHYs and traffic management ASICs in a ruggedized Layer-3 switch operating at –40 °C to +85 °C ambient. IC Role / Device Role / Timing Role: Industrial-grade clock buffer supplying 250 MHz reference to multiple MAC/PHY pairs with per-port phase tuning for deterministic latency calibration. Use Value: 3.3 V-only supply and extended temperature rating eliminate need for voltage translators or thermal derating - reduces qualification effort. |
Use Scenario: Generating precisely skewed stimulus clocks for ATE systems requiring sub-nanosecond timing correlation across 16 DUT channels. IC Role / Device Role / Timing Role: Programmable skew generator using QF feedback and 625 ps phase steps to align test vectors with DUT input capture windows. Use Value: Individual bank disable (DIS1/DIS2) enables channel-by-channel functional testing without signal contention or ground bounce coupling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-phase PLL clock buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT5V9885BGI | 8 outputs, no dedicated feedback output; phase resolution 125 ps; requires external loop filter. | Lacks integrated QF feedback path and bank-level disable - less suitable for complex multi-ratio clock trees with dynamic reconfiguration. | Prefer when ultra-fine 125 ps phase tuning is required and feedback routing flexibility outweighs integration benefits. |
| ON Semi NB3N502FG | 6 outputs, fixed 1:1/1:2/1:4 dividers; no phase adjustment; LVDS outputs only. | No programmable skew or reference switchover - limited to static, single-ratio clock fanout in non-redundant systems. | Prefer for cost-sensitive, low-complexity applications where only basic clock replication is needed. |
Compared with IDT5V9885BGI and NB3N502FG, the CY7B9945V-2AXCT uniquely combines dedicated feedback output, dual-reference fault tolerance, and independent bank disable - making it optimal for telecom and computing systems requiring runtime clock reconfiguration and high reliability.
Availability
CY7B9945V-2AXCT is available at Aetrix Electronics and suitable for high-speed computing backplanes, telecom line cards, industrial Ethernet switches, and ATE clock distribution systems requiring stable component supply and long-term lifecycle support.
Supply support for CY7B9945V-2AXCT 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) designs high-performance timing, memory, and programmable logic solutions for industrial, automotive, and communications markets.
The RoboClock® product line delivers integrated PLL clock buffers optimized for deterministic timing, low skew, and system-level fault tolerance in mission-critical infrastructure equipment.
FAQ
What is the maximum supported input frequency for CY7B9945V-2AXCT?
The CY7B9945V-2AXCT supports input frequencies from 24 MHz to 200 MHz, with the upper limit dependent on the FS pin configuration (HIGH setting enables 96–200 MHz nominal range). This range covers standard Ethernet, PCIe, and SONET/SDH reference clocks without external prescaling.
How does the REFSEL pin affect clock source selection?
The REFSEL pin selects between REFA+/− and REFB+/− differential reference inputs: LOW activates REFA, HIGH activates REFB. An internal pull-down ensures REFA is default when REFSEL is unconnected. Dynamic switching is supported with minimal phase disruption due to PLL optimization during relock.
Can the CY7B9945V-2AXCT operate with single-ended LVTTL inputs?
Yes - each differential reference pair (REFA+/−, REFB+/−) can accept single-ended LVTTL signals by leaving the complementary pin open (internally biased to 1.5 V). The active pin then functions as a standard 3.3 V LVTTL input, enabling compatibility with crystal oscillators or CMOS clock sources.
What happens to outputs when DIS1 and DIS2 are asserted HIGH?
When DIS1 or DIS2 is HIGH, the corresponding output bank (1Q[0:3] or 2Q[0:5]) enters either HOLD-OFF (driven LOW on falling edge, glitch-free stop) or High-Z state, depending on the MODE pin level. HOLD-OFF occurs when MODE is LOW; High-Z occurs when MODE is HIGH - supporting both power saving and boundary-scan test modes.
CY7B9945V-2AXCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- RoboClock™
- Package/Case:
- 52-LQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Clock Buffer, Fanout Distribution
- PLL:
- Yes
- Input:
- LVPECL, LVTTL
- Output:
- LVTTL
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 4:10
- Differential - Input:Output:
- Yes/No
- Frequency - Max:
- 200MHz
- Divider/Multiplier:
- Yes/Yes
- Voltage - Supply:
- 2.97V ~ 3.63V
- Operating Temperature:
- 0°C ~ 70°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 52-TQFP (10x10)
CY7B9945V-2AXCT FAQ
1.How can I place an order for CY7B9945V-2AXCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7B9945V-2AXCT 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 CY7B9945V-2AXCT reliable?
The price and inventory of CY7B9945V-2AXCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7B9945V-2AXCT is usually 5 days.
3.What payment methods are accepted for CY7B9945V-2AXCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7B9945V-2AXCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7B9945V-2AXCT?
CY7B9945V-2AXCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7B9945V-2AXCT 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 CY7B9945V-2AXCT?
For technical support, including CY7B9945V-2AXCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7B9945V-2AXCT requirements.
6.How does Aetrix verify that CY7B9945V-2AXCT is sourced from the original manufacturer or authorized distributors?
All CY7B9945V-2AXCT 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 CY7B9945V-2AXCT meets industry standards.
7.What is the process for return or replacement of CY7B9945V-2AXCT?
All CY7B9945V-2AXCT units undergo pre-shipment inspection (PSI). If there is an issue with CY7B9945V-2AXCT, 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 CY7B9945V-2AXCT part is unused and in its original packaging.
Return procedure for CY7B9945V-2AXCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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