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Texas Instruments SN65EPT21DR
- Part No.:
- SN65EPT21DR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN65EPT21DR.pdf
- Description:
- IC TRANSLTR UNIDIRECTIONAL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:662
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Product details
Overview
SN65EPT21DR from Texas Instruments is a 3.3-V differential PECL/LVDS-to-TTL level translator in SOIC-8 package, featuring 1 ns propagation delay, >300 MHz maximum switching frequency, and 24-mA TTL output drive. It converts high-speed differential clock or data signals (LVPECL/LVDS/CML) to single-ended LVTTL for FPGA, ASIC, or microcontroller interfacing in backplane systems.
For engineers reviewing the SN65EPT21DR datasheet, SN65EPT21DR pinout, SN65EPT21DR application, or SN65EPT21DR equivalent, this device serves as a precision timing interface solution requiring sub-nanosecond timing integrity, rail-to-rail TTL output compliance, and VBB-referenced single-ended input biasing in industrial clock distribution networks.
Technical Context
The SN65EPT21DR implements a fully differential input stage with internal 50-kΩ pull-up/pull-down resistors and a dedicated VBB reference output (1.91–2.16 V) for ac-coupled or single-ended input biasing. Its TTL output stage delivers 24 mA sink current with VOH ≥ 2.4 V at IOH = –3 mA and VOL ≤ 0.5 V at IOL = 24 mA.
It operates across –40°C to 85°C with supply range 3.0 V to 3.6 V, supports PECL/LVDS/CML input standards, and maintains <5 ps RMS random jitter and <250 ps duty cycle skew over full temperature and voltage range - enabling reliable high-frequency clock forwarding in synchronous digital systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0 V to 3.6 V - ensures compatibility with modern 3.3-V logic domains without level-shifting circuitry |
| Propagation Delay | 1000–1800 ps - enables sub-1-ns timing budget allocation in high-speed clock trees |
| Max Switching Frequency | 300 MHz - supports DDR2/DDR3 clock rates and parallel data bus timing |
| TTL Output Drive | 24 mA sink - directly drives standard LVTTL inputs without external buffers |
| VBB Reference Voltage | 1.91–2.16 V - provides precise mid-supply bias for single-ended LVPECL input termination |
| Input Compatibility | LVPECL / LVDS / CML - accepts multiple differential signaling standards on same pins |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and telecom infrastructure use |
Pinout & Package
SN65EPT21DR is housed in an industry-standard SOIC-8 package (D package), 3.91 mm × 4.90 mm footprint, 1.75 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Internally unused; must be left floating or tied to GND per layout best practice |
| 2 (Q) | LVTTL/LVCMOS Output | Single-ended TTL-compatible output driving downstream logic with 24-mA sink capability |
| 3 (NC) | No Connect | Internally unused; no electrical connection - leave unconnected |
| 4 (VCC) | Positive Supply | 3.0–3.6 V main power rail; requires 0.01 μF decoupling to VBB when used |
| 5 (D) | Differential Input (–) | Inverting input of differential PECL/LVDS receiver; accepts 150–1200 mVpp swing |
| 6 (D) | Differential Input (+) | Non-inverting input of differential PECL/LVDS receiver; matched to Pin 5 for common-mode rejection |
| 7 (GND) | Ground Reference | Primary return path for supply and signal currents; connects to system ground plane |
| 8 (VBB) | Reference Voltage Output | Stable 1.91–2.16 V bias source for single-ended input termination or AC-coupled input biasing |
Key Features
| Feature | Design Value |
|---|---|
| Drop-in compatibility | Pin- and function-compatible with MC10EPT21/MC100EPT21 - enables legacy design migration without PCB change |
| Built-in temperature compensation | Maintains stable VBB and propagation delay across –40°C to +85°C - eliminates external calibration |
| Open-input fail-safe | Internal 50-kΩ pull-up/pull-down resistors hold inputs at VCC/2 when unterminated - prevents metastability |
| Low jitter performance | 2.25–5 ps RMS random jitter - preserves signal integrity in high-speed clock distribution paths |
| VBB current limit | ±0.5 mA max sink/source - allows safe use as bias reference without external regulation |
Applications
| Backplane Clock Distribution | FPGA-to-ASIC Interface |
|---|---|
Use Scenario: Transmitting 200-MHz system clock across 12-inch FR4 backplane with impedance-controlled traces. IC Role / Device Role / Timing Role: PECL-to-TTL translator converting differential backplane clock to single-ended LVTTL for FPGA clock input bank. Use Value: Sub-1-ns propagation delay and <250-ps duty cycle skew preserve 50% clock duty cycle at destination, meeting FPGA setup/hold requirements. |
Use Scenario: Interfacing LVDS serializer output from ASIC to LVTTL input of Xilinx Artix-7 FPGA. IC Role / Device Role / Timing Role: Signal-level translator bridging mismatched I/O standards while maintaining timing closure. Use Value: 300-MHz bandwidth and 24-mA drive ensure clean edge transitions into FPGA input capacitance without waveform degradation. |
| Industrial PLC Timing Module | Test Equipment Clock Synthesis |
Use Scenario: Converting LVPECL reference clock from OCXO module to TTL for microcontroller timer input in ruggedized PLC. IC Role / Device Role / Timing Role: Robust level shifter operating reliably across –40°C to +85°C ambient with ESD-hardened inputs. Use Value: Built-in temperature compensation and ±2-kV HBM ESD rating eliminate need for external protection or recalibration in harsh environments. |
Use Scenario: Generating synchronized TTL clocks from differential outputs of arbitrary waveform generator in ATE system. IC Role / Device Role / Timing Role: Precision timing interface ensuring deterministic delay and minimal jitter injection into DUT clock path. Use Value: 1-ns typical propagation delay and <5-ps RMS jitter enable sub-picosecond timing resolution in high-accuracy test setups. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential-to-single-ended translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN65LVD232DR | LVDS-to-LVTTL translator with 3.3-V supply, but lacks VBB reference and PECL support; 2.5-ns delay | Only suitable for LVDS (not PECL/CML) inputs; lower speed margin for >250-MHz use cases | Select when input is strictly LVDS and VBB biasing is unnecessary |
| MC100EPT21DG | 5-V ECL-family part with identical pinout/function but requires 5-V supply and negative VEE; no VBB output | Not compatible with 3.3-V systems; needs dual-rail supply and level-shifted inputs | Choose only for legacy 5-V ECL designs where SN65EPT21DR's 3.3-V operation is not required |
Compared with SN65EPT21DR, SN65LVD232DR offers lower cost but sacrifices PECL/CML compatibility and VBB biasing, while MC100EPT21DG retains functional equivalence only in 5-V environments - making SN65EPT21DR the sole 3.3-V drop-in solution with integrated VBB for mixed-signaling backplanes.
Availability
SN65EPT21DR is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and test equipment applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant SOIC packaging.
Supply support for SN65EPT21DR 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 ICs and industrial-grade reliability.
The SN65EPT21DR belongs to TI's high-speed interface translator product line, engineered specifically for robust signal integrity in clock/data transmission across backplanes, FPGAs, and mixed-voltage systems.
FAQ
What is the recommended decoupling for SN65EPT21DR VBB pin?
A 0.01-μF ceramic capacitor must be placed between VCC and VBB when using the VBB reference output. This stabilizes the 1.91–2.16 V reference under dynamic load. The VBB pin must not sink or source more than ±0.5 mA; exceeding this risks reference drift or damage. When unused, VBB should remain open - no capacitor or connection is needed.
Can SN65EPT21DR accept LVDS inputs without modification?
Yes, SN65EPT21DR natively supports LVDS inputs alongside LVPECL and CML on its differential D/D pins. Its input common-mode range (1.2 V to 3.3 V) and 150–1200 mVpp sensitivity accommodate standard LVDS signaling. No external resistors or biasing is required beyond standard 100-Ω differential termination at the source.
Is SN65EPT21DR pin-compatible with MC10EPT21 in SOIC-8 package?
Yes, SN65EPT21DR is explicitly designed as a drop-in replacement for MC10EPT21 and MC100EPT21 in SOIC-8 (D) package. Pin assignments, function mapping, and AC/DC specifications align - though SN65EPT21DR operates at 3.3 V only, unlike the 5-V MC10x series, so supply voltage must be verified.
What is the maximum allowable sink current on SN65EPT21DR Q output?
The SN65EPT21DR Q output is rated for 24 mA sink current (IOL) with VOL ≤ 0.5 V. Exceeding 24 mA may cause VOL to rise above specification, violating LVTTL logic thresholds. For loads requiring >24 mA, an external buffer or driver stage is required - the SN65EPT21DR itself does not support higher drive strength.
Does SN65EPT21DR require external pull-up resistors on its differential inputs?
No - SN65EPT21DR includes internal 50-kΩ pull-up and pull-down resistors on both D inputs. These maintain inputs at VCC/2 when left open, preventing undefined states. External pull-ups are unnecessary and may distort common-mode voltage; only standard 100-Ω differential termination is needed for driven inputs.
SN65EPT21DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 65EPT
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Translator Type:
- Mixed Signal
- Channel Type:
- Unidirectional
- Number of Circuits:
- 1
- Channels per Circuit:
- 1
- Voltage - VCCA:
- -
- Voltage - VCCB:
- -
- Input Signal:
- LVDS, PECL
- Output Signal:
- TTL
- Output Type:
- Non-Inverted
- Data Rate:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC (0.154", 3.90mm Width)
SN65EPT21DR FAQ
1.How can I place an order for SN65EPT21DR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN65EPT21DR 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 SN65EPT21DR reliable?
The price and inventory of SN65EPT21DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN65EPT21DR is usually 5 days.
3.What payment methods are accepted for SN65EPT21DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN65EPT21DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN65EPT21DR?
SN65EPT21DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN65EPT21DR 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 SN65EPT21DR?
For technical support, including SN65EPT21DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN65EPT21DR requirements.
6.How does Aetrix verify that SN65EPT21DR is sourced from the original manufacturer or authorized distributors?
All SN65EPT21DR 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 SN65EPT21DR meets industry standards.
7.What is the process for return or replacement of SN65EPT21DR?
All SN65EPT21DR units undergo pre-shipment inspection (PSI). If there is an issue with SN65EPT21DR, 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 SN65EPT21DR part is unused and in its original packaging.
Return procedure for SN65EPT21DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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