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Texas Instruments TLK1521IPAP
- Part No.:
- TLK1521IPAP
- Manufacturer:
- Texas Instruments
- Category:
- Serializers, Deserializers
- Package:
- 64-PowerTQFP
- Datasheet:
-
TLK1521IPAP.pdf
- Description:
- IC TXRX 1.3GBPS 18BIT 64-HTQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,592
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Product details
Overview
TLK1521IPAP from Texas Instruments is a 1.3 Gbps Serializer/Deserializer (SerDes) transceiver IC for high-speed point-to-point serial links. It performs parallel-to-serial and serial-to-parallel conversion on an 18-bit TTL bus, uses an on-chip PLL for clock synthesis from a 25–65 MHz reference, supports hot-plug operation, and delivers 1.17 Gbps effective data payload over backplanes or copper cables.
For engineers reviewing the TLK1521IPAP datasheet, TLK1521IPAP pinout, TLK1521IPAP application, or TLK1521IPAP equivalent, key selection considerations include its 64-pin HTQFP PowerPAD package, 2.5-V supply with 3-V I/O compatibility, selectable preemphasis, passive receive equalization, and deterministic lock timing via SYNC mode - all critical for backplane interconnect and embedded serial link design.
Technical Context
The TLK1521IPAP implements a fixed 18-bit parallel interface with start/stop framing (20-bit serialized word), transmitting LSB-first at 20× GTX_CLK rate. Its interpolator-based clock recovery locks to incoming serial data within ±200 ppm of the GTX_CLK-derived nominal rate, enabling robust operation without external reference at the receiver.
It integrates dual-mode synchronization: rapid lock using deterministic 18-bit SYNC patterns (nine 1s + nine 0s), and random-lock capability for hot-insertion into live backplanes. The receiver includes passive equalization and differential input thresholds ≥200 mV, while the transmitter offers programmable preemphasis to compensate for ISI in lossy media.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Serial Data Rate | 0.5–1.3 Gbps; enables scalable backplane links from mid-range to high-speed interconnects |
| Parallel Interface Width | 18-bit TTL; supports legacy parallel protocol devices without redesigning host logic |
| Reference Clock (GTX_CLK) | 25–65 MHz ±100 ppm; determines serial rate (20×) and sets PLL target for both TX and RX |
| Power Supply | 2.5 V ±0.2 V; low-power operation with typical 288 mW at 1.3 Gbps, compatible with 3-V I/O |
| Operating Temperature | −40°C to +85°C; qualified for industrial environments including telecom and industrial control systems |
| Latency (TX/RX) | 17–20 bits (TX), 90–96 bits (RX) at 1.3 Gbps; deterministic delay critical for real-time link timing budgets |
| Differential Output Swing | 1.12–2.56 VPP (pre/de-emphasis); configurable drive strength for 50-Ω controlled-impedance media |
Pinout & Package
The TLK1521IPAP is housed in a thermally enhanced 64-pin HTQFP PowerPAD® package (PAP64). The exposed die pad must be soldered to a grounded thermal land for optimal electrical grounding and thermal performance; ac specifications assume this connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pins 1, 9, 23, 38, 48) | Digital power supply | Supplies 2.5-V core logic and digital I/O buffers; requires local decoupling |
| VDDA (Pins 55, 57) | Analog power supply | Provides clean 2.5-V reference for high-speed TX/RX analog circuitry; separate from digital VDD |
| GND / GNDA (Pins 5, 13, 18, 28, 33, 43 / 52, 58, 61) | Digital/analog ground | Separate ground planes required; GNDA serves high-speed analog front-end to minimize noise coupling |
| GTX_CLK (Pin 8) | Reference clock input | 25–65 MHz single-ended TTL clock; drives internal 10× PLL multiplier and TX parallel latch edge |
| TXD[0:17] (Pins 62–64, 2–4, 6–7, 10–12, 14–16, 17, 19–22) | Transmit parallel data inputs | 18-bit TTL bus latched on rising GTX_CLK edge; no internal serialization control needed |
| RXD[0:17] (Pins 51–50, 49, 47–46, 45–44, 42, 40–39, 37–36, 35–34, 32–31, 30–29) | Receive parallel data outputs | 18-bit TTL outputs synchronized to recovered RX_CLK; tri-stated during power-up and ENABLE = low |
| DOUTTXP/N (Pins 60/59) | Differential serial output | PECL-compatible NRZ outputs; preemphasis enabled via PREEMPH pin; high-Z when LOOPEN = high |
| DINRXP/N (Pins 54/53) | Differential serial input | Receiver inputs with ≥200 mV differential threshold; support AC/DC coupling and passive equalization |
| LOCKB (Pin 26) | Receiver lock indicator | Active-low open-drain output signaling valid deserialization lock; used for system-level link status monitoring |
| SYNC (Pin 25) | Fast synchronization control | Asserted high to transmit deterministic 18-bit pattern for sub-millisecond deserializer lock acquisition |
| ENABLE (Pin 24) | Global device enable | Low disables TX/RX functions and places I/O pins in high-Z; initiates power-on reset when transitioned high |
| LOOPEN (Pin 21) | Internal loopback control | High routes DOUTTXP/N directly to DINRXP/N for at-speed functional self-test without external cabling |
Key Features
| Feature | Design Value |
|---|---|
| Hot-plug protection | On-chip power-on reset holds RX_CLK low and tri-states all parallel I/O during power ramp, preventing bus contention |
| Selectable preemphasis | Configurable output swing boost on first bit of same-value runs compensates for channel loss up to 10 dB at 650 MHz |
| Passive receive equalization | Integrated analog equalizer improves signal integrity on lossy backplanes or long copper traces without active components |
| Deterministic sync mode | SYNC pin triggers transmission of known 18-bit pattern enabling <1 ms lock time - essential for predictable system boot |
| Industrial temperature range | Validated operation from −40°C to +85°C ensures reliability in base station, industrial automation, and transportation systems |
Applications
| Backplane Interconnect | Point-to-Point Data Link |
|---|---|
Use Scenario: High-speed communication between line cards in telecom chassis using FR4 backplanes with ~50 Ω impedance. IC Role / Device Role / Timing Role: SerDes physical layer interface converting 18-bit parallel bus traffic to 1.3 Gbps differential serial stream with embedded clock recovery. Use Value: Replaces >36 parallel traces with 1 differential pair per direction, reducing EMI, connector count, and PCB layer count while maintaining deterministic latency. |
Use Scenario: Bidirectional data transfer between FPGA-based processing modules over 1-meter shielded twisted-pair copper cable. IC Role / Device Role / Timing Role: Serializer/deserializer providing 1.17 Gbps payload with preemphasis and passive equalization to overcome channel attenuation. Use Value: Eliminates need for external retimers or repeaters; achieves error-free link at 1.3 Gbps without active equalization or complex PHY configuration. |
| Optical Module Interface | Legacy Protocol Bridging |
Use Scenario: Electrical interface between ASIC and SFP+ optical transceiver module in enterprise switch line cards. IC Role / Device Role / Timing Role: Electrical-to-optical bridge translating parallel protocol data to serial format compatible with optical driver ICs. Use Value: Enables use of cost-effective SFP+ modules without requiring full CDR or FEC functionality in host ASIC; leverages existing 18-bit bus architecture. |
Use Scenario: Upgrading legacy 18-bit parallel bus systems (e.g., custom ASIC-to-ASIC links) to higher bandwidth without changing host logic. IC Role / Device Role / Timing Role: Transparent parallel-to-serial converter preserving original timing relationships and data alignment. Use Value: Doubles effective throughput vs. parallel bus while retaining software and firmware compatibility; minimal board redesign required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SerDes transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLK2201BIRCP | 2.5 Gbps max rate; 16-bit parallel interface; integrated CDR with wider jitter tolerance (0.8 UI) | Targets higher-speed backplanes (>1.5 Gbps) and longer reach; lacks SYNC pin for deterministic lock | Choose for future-proofing beyond 1.3 Gbps or where jitter margin is critical; not pin-compatible |
| DS25BR100TSQ | 3.125 Gbps max; 10-bit parallel interface; LVDS I/O; no on-chip PLL or SYNC mode | Suited for shorter-reach, lower-latency links (e.g., chip-to-chip on same board); requires external clock synthesis | Prefer for compact, ultra-high-speed designs where 18-bit width and deterministic initialization are not required |
Compared with TLK1521IPAP, TLK2201BIRCP offers higher bandwidth but sacrifices deterministic sync and 18-bit width, while DS25BR100TSQ provides greater speed and lower power but eliminates integrated clock synthesis and hot-plug lock assurance - making TLK1521IPAP uniquely balanced for industrial backplane upgrades requiring reliability, compatibility, and ease of integration.
Availability
TLK1521IPAP is available at Aetrix Electronics and suitable for high-speed backplane interconnect, point-to-point data links, and optical module bridging requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial deployment.
Supply support for TLK1521IPAP 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in high-speed interface solutions.
The TLK1521IPAP belongs to TI's WizardLink family of multi-gigabit transceivers, designed specifically for cost-sensitive, high-reliability industrial and telecom backplane applications requiring deterministic synchronization and hot-plug resilience.
FAQ
What is the maximum supported serial data rate for the TLK1521IPAP?
The TLK1521IPAP supports a maximum serial data rate of 1.3 Gbps, corresponding to a 65 MHz GTX_CLK input multiplied by 20. At this rate, it delivers an effective 1.17 Gbps payload (18 bits × 65 MHz) with start/stop framing overhead. Operation down to 500 Mbps (25 MHz GTX_CLK) is also fully characterized and guaranteed across the industrial temperature range.
Does the TLK1521IPAP require an external clock source for receiver operation?
Yes - the TLK1521IPAP requires the GTX_CLK reference clock even when only the receiver function is used. The internal PLL uses GTX_CLK to generate phase-aligned clocks for the interpolator and clock recovery circuitry. The receiver can track incoming serial data within ±200 ppm of the GTX_CLK-derived nominal rate, allowing use of standard ±100 ppm crystal oscillators.
How does the SYNC pin improve system initialization time in the TLK1521IPAP?
The SYNC pin on the TLK1521IPAP triggers transmission of a deterministic 18-bit pattern (111111111000000000), enabling the deserializer to achieve lock in under 1 ms. This eliminates reliance on random data patterns and unpredictable lock times, making it ideal for systems requiring fast, repeatable boot sequences - such as telecom line cards or industrial controllers with strict power-up timing budgets.
Can the TLK1521IPAP operate in hot-plug environments?
Yes - the TLK1521IPAP includes dedicated hot-plug protection circuitry. Its on-chip power-on reset asserts during power ramp, holding RX_CLK low and placing all parallel I/O pins (TXD, RXD) and serial outputs (DOUTTXP/N) in high-impedance states until supply stabilization. This prevents bus contention and signal corruption when inserted into a live backplane or powered system.
What is the purpose of the PowerPAD in the TLK1521IPAP package?
The PowerPAD in the TLK1521IPAP is an exposed metal die pad on the underside of the 64-pin HTQFP package. It serves as both a primary thermal path and a major electrical ground connection. TI specifies that it must be soldered to a grounded thermal land on the PCB; all ac performance data in the datasheet assumes this configuration, and omitting it degrades jitter, power dissipation, and signal integrity.
TLK1521IPAP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 64-PowerTQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Function:
- Serializer/Deserializer
- Data Rate:
- 1.3Gbps
- Input Type:
- LVTTL
- Output Type:
- VML
- Number of Inputs:
- 18/1
- Number of Outputs:
- 1/18
- Voltage - Supply:
- 2.3V ~ 2.7V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-HTQFP (10x10)
TLK1521IPAP FAQ
1.How can I place an order for TLK1521IPAP through Aetrix?
Please submit a Request for Quotation (RFQ) for TLK1521IPAP 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 TLK1521IPAP reliable?
The price and inventory of TLK1521IPAP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLK1521IPAP is usually 5 days.
3.What payment methods are accepted for TLK1521IPAP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLK1521IPAP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLK1521IPAP?
TLK1521IPAP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLK1521IPAP 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 TLK1521IPAP?
For technical support, including TLK1521IPAP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLK1521IPAP requirements.
6.How does Aetrix verify that TLK1521IPAP is sourced from the original manufacturer or authorized distributors?
All TLK1521IPAP 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 TLK1521IPAP meets industry standards.
7.What is the process for return or replacement of TLK1521IPAP?
All TLK1521IPAP units undergo pre-shipment inspection (PSI). If there is an issue with TLK1521IPAP, 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 TLK1521IPAP part is unused and in its original packaging.
Return procedure for TLK1521IPAP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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