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Infineon Technologies CY26049ZXI-36T
- Part No.:
- CY26049ZXI-36T
- Manufacturer:
- Infineon Technologies
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
CY26049ZXI-36T.pdf
- Description:
- IC CLK/FREQ SYNTH 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,336
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Product details
Overview
CY26049ZXI-36 from Cypress Semiconductor is a FailSafe™ PacketClock™ global communications clock generator featuring a digitally controlled crystal oscillator (DCXO) as primary clock source, integrated PLL with ±250 ppm lock range, 3.3V operation, industrial temperature range (–40°C to +85°C), and three programmable outputs (CLK, CLK/2, 8K) supporting T1/DS1, E1, OC-3, and other telecom standards.
For engineers reviewing the CY26049ZXI-36 datasheet, CY26049ZXI-36 pinout, CY26049ZXI-36 application, or CY26049ZXI-36 equivalent, this device delivers zero-ppm synthesis error, glitch-free failover between reference and DCXO, high-impedance output control via FS[3:0], and jitter attenuation in buffer mode - critical for telecom line cards, SONET/SDH equipment, and carrier-grade timing systems.
Technical Context
The CY26049ZXI-36 implements a dual-source clock architecture where the DCXO serves as the primary timing source, synchronized to an external reference (8 kHz or 10–60 MHz) only when within ±250 ppm pull range; SAFE pin asserts high during synchronization and low during reference loss. Its PLL operates without external loop filter components, reducing BOM count and layout complexity.
In buffer mode (FS3:FS0 = 1110 or 1111), it functions as a jitter attenuator: input clock jitter is suppressed via DCXO-based regeneration, delivering ≤250 ps peak-to-peak period jitter on outputs >5 MHz and ≤500 ps on outputs <5 MHz - verified across commercial and industrial temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.3 V ± 5% - enables direct compatibility with standard 3.3V telecom power rails without regulation overhead |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade carrier infrastructure deployment |
| Output Jitter (≥5 MHz) | ≤250 ps pk-pk (10,000 cycles) - meets GR-1244-CORE and ITU-T G.823 jitter compliance for DS3/E3 interfaces |
| Synthesis Accuracy | 0 ppm mean frequency error - eliminates need for post-synthesis calibration in frequency-critical applications |
| FailSafe Lock Range | ±250 ppm - ensures robust re-locking after reference drift or transient loss in noisy telecom environments |
| Input Reference Range | 8 kHz or 10–60 MHz - supports both legacy TDM framing clocks and modern high-speed serial reference inputs |
| Crystal Frequency | 18.432 MHz pullable AT-cut crystal - enables precise generation of T1 (1.544 MHz), E1 (2.048 MHz), and OC-3 (155.52 MHz) rates |
Pinout & Package
16-pin TSSOP package (6.5 mm × 4.4 mm × 1.1 mm height), JEDEC MO-153 compliant, lead-free compatible, with exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ICLK | Reference Input Clock | Accepts 8 kHz framing signal or 10–60 MHz system reference; drives FAILSAFE control logic and PLL phase detector |
| 8K | Output Clock / High-Z Buffer | Provides 8 kHz output in external mode; tri-stated in buffer mode - used for frame synchronization in T1/E1 line interfaces |
| FS[3:0] | Frequency Select Control | 4-bit parallel interface selecting one of 16 output configurations per Table 1; determines CLK/2 and CLK frequencies and 8K state |
| XIN / XOUT | Pullable Crystal Interface | Connects to 18.432 MHz AT-cut crystal; internal oscillator circuit provides load capacitance matching 14 pF nominal |
| SAFE | Failsafe Status Indicator | Open-drain output: high = ICLK locked and within ±250 ppm; low = reference lost or out-of-range - enables system-level fault detection |
| CLK / CLK/2 | Primary Clock Outputs | Differential-capable CMOS outputs; CLK delivers up to 155.52 MHz (OC-3), CLK/2 delivers half-rate with matched duty cycle (45–55%) |
Key Features
| Feature | Design Value |
|---|---|
| DCXO-as-Primary Architecture | Eliminates single-point clock failure: maintains last-known frequency/phase during reference loss, enabling continuous operation without system reset |
| Glitch-Free Reference Switching | Hardware-synchronized transition between reference and DCXO sources ensures no clock discontinuity - avoids data corruption in synchronous FIFOs and SerDes |
| Buffer Mode Jitter Attenuation | Reduces input jitter by filtering through DCXO regeneration - achieves sub-250 ps output jitter even with >1 ns input jitter |
| Zero-PPM Synthesis Error | Guaranteed exact integer-ratio derivation from 18.432 MHz crystal - removes need for software trimming or external calibration in frequency-sensitive protocols |
| Industrial Temp Qualified Outputs | All three outputs (CLK, CLK/2, 8K) maintain specified jitter, duty cycle, and drive strength across –40°C to +85°C - validated per AC electrical specs |
Applications
| T1/E1 Line Card Timing | SONET/SDH OC-3 Equipment |
|---|---|
|
Use Scenario: Synchronizing T1 (1.544 MHz) and E1 (2.048 MHz) line interfaces in multi-port access concentrators with redundant reference inputs. IC Role / Device Role / Timing Role: Primary clock generator providing phase-aligned CLK and 8K outputs; SAFE pin feeds FPGA status monitor for automatic reference switchover. Use Value: Maintains DS1/E1 frame alignment during reference failure, preventing bit errors and AIS alarms - validated at –40°C to +85°C per GR-499-CORE. |
Use Scenario: Generating 155.52 MHz OC-3 line rate and 77.76 MHz section overhead clocks in optical transport shelf controllers. IC Role / Device Role / Timing Role: Low-jitter clock source for SERDES PHYs and framer ASICs; operates in external mode with FS[3:0]=0100 for fixed OC-3 output. Use Value: Delivers ≤250 ps period jitter at 155.52 MHz - meets ITU-T G.823 Category I mask for SDH equipment without external jitter cleaners. |
| Carrier-Grade Ethernet Switch Timing | Wireless Base Station Sync |
|
Use Scenario: Providing stratum-3-equivalent timing for IEEE 1588 PTP grandmaster clocks and Synchronous Ethernet (SyncE) PHYs in metro aggregation switches. IC Role / Device Role / Timing Role: Jitter-attenuating buffer (FS[3:0]=1110) regenerating clean 125 MHz from noisy 25 MHz system reference. Use Value: Reduces input jitter by >70% to meet ITU-T G.8262 EEC-2 mask for SyncE - verified with 10–60 MHz input range and industrial temp operation. |
Use Scenario: Delivering stable 13 MHz, 19.2 MHz, and 26 MHz clocks for LTE/5G RF transceivers and baseband processors under thermal stress. IC Role / Device Role / Timing Role: Programmable clock generator using FS[3:0] to select multiple output rates from single 18.432 MHz crystal; SAFE monitors GPS-disciplined reference health. Use Value: Enables holdover timing during GPS outage with <1 ppm frequency drift over 24 hours - supported by DCXO stability spec and industrial temp qualification. |
Equivalent & Alternatives
Two functionally aligned alternatives exist for telecom clock generation with failover capability:
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT8T49N285A | Integrated VCXO + dual PLL; supports JESD204B deterministic latency; requires external crystal and loop filter | Targeted at high-speed data converters and radar systems - lacks native 8 kHz framing output and SAFE pin logic | Choose when deterministic phase alignment across multiple clocks is required; avoid if 8 kHz sync or simple failover is primary need. |
| Si5338A-D-GM | Multi-output clock generator with DCO-based hitless switching; supports I²C programming and spread spectrum; no dedicated SAFE pin | Designed for packet-switched networks and computing platforms - requires firmware configuration and lacks hardware-level failover signaling | Choose for flexible multi-rate synthesis in non-telecom applications; avoid when hardware-triggered reference loss detection is mandatory. |
Compared with IDT8T49N285A and Si5338A-D-GM, the CY26049ZXI-36 uniquely combines hardware-based failover signaling (SAFE pin), native 8 kHz framing support, zero-ppm synthesis, and industrial-qualified jitter performance - making it optimal for carrier-class TDM and SONET infrastructure where reliability trumps configurability.
Availability
CY26049ZXI-36 is available at Aetrix Electronics and suitable for T1/E1 line card timing, SONET/SDH OC-3 equipment, and carrier-grade Ethernet switch timing requiring stable component supply across extended temperature and long-lifecycle deployments.
Supply support for CY26049ZXI-36 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-reliability timing, memory, and microcontroller solutions for industrial, automotive, and communications markets.
The CY26049 product line delivers FailSafe™ clock generation for telecom infrastructure - engineered specifically for continuous operation during reference failure in carrier-grade line cards and optical transport systems.
FAQ
What is the function of the SAFE pin?
The SAFE pin is an open-drain status indicator: driven high when the ICLK reference is within ±250 ppm of nominal and successfully synchronized to the DCXO; driven low when reference is absent, out-of-range, or unlocked. It directly enables hardware-level failover decisions in FPGA or ASIC control logic without software polling.
Can CY26049ZXI-36 operate without an external crystal?
No. The device requires an 18.432 MHz pullable AT-cut crystal connected between XIN and XOUT pins to function. The internal DCXO relies on this crystal for frequency stability and pull-range operation; no internal resonator or alternative timing source is provided.
How does buffer mode differ from external mode?
In buffer mode (FS3:FS0 = 1110 or 1111), the device regenerates ICLK as a low-jitter output (CLK = ICLK or 2×ICLK) while disabling CLK/2 and 8K; in external mode, all three outputs are active and frequency-programmed via FS[3:0]. Buffer mode provides jitter attenuation; external mode enables multi-rate synthesis.
Is the CY26049ZXI-36 RoHS-compliant and lead-free?
Yes. The "ZX" prefix in CY26049ZXI-36 denotes lead-free, RoHS-compliant packaging per JEDEC MO-153 TSSOP specification. It uses matte tin finish and meets IPC/JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) requirements.
CY26049ZXI-36T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- Failsafe™, PacketClock™
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Clock/Frequency Synthesizer, Clock Generator, Fanout Distribution, Jitter Attenuator
- PLL:
- Yes with Bypass
- Input:
- Clock
- Output:
- Clock
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 1:3
- Differential - Input:Output:
- No/No
- Frequency - Max:
- 155MHz
- Divider/Multiplier:
- Yes/No
- Voltage - Supply:
- 3.15V ~ 3.45V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-TSSOP
CY26049ZXI-36T FAQ
1.How can I place an order for CY26049ZXI-36T through Aetrix?
Please submit a Request for Quotation (RFQ) for CY26049ZXI-36T 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 CY26049ZXI-36T reliable?
The price and inventory of CY26049ZXI-36T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY26049ZXI-36T is usually 5 days.
3.What payment methods are accepted for CY26049ZXI-36T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY26049ZXI-36T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY26049ZXI-36T?
CY26049ZXI-36T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY26049ZXI-36T 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 CY26049ZXI-36T?
For technical support, including CY26049ZXI-36T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY26049ZXI-36T requirements.
6.How does Aetrix verify that CY26049ZXI-36T is sourced from the original manufacturer or authorized distributors?
All CY26049ZXI-36T 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 CY26049ZXI-36T meets industry standards.
7.What is the process for return or replacement of CY26049ZXI-36T?
All CY26049ZXI-36T units undergo pre-shipment inspection (PSI). If there is an issue with CY26049ZXI-36T, 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 CY26049ZXI-36T part is unused and in its original packaging.
Return procedure for CY26049ZXI-36T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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