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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Clock Buffers, Drivers

Texas Instruments CDC2351MDBREP

Name: CDC2351MDBREP
Brand: Texas Instruments
SKU: CDC2351MDBREP
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CDC2351MDBREP

Manufacturer:: Texas Instruments

Category:: Clock Buffers, Drivers

Package:: 24-SSOP (0.209", 5.30mm Width)

Datasheet:: CDC2351MDBREP.pdf

Description:: IC CLK BUFFER 1:10 100MHZ 24SSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

CDC2351MDBREP from Texas Instruments is a high-performance, military-grade clock distribution IC that buffers and fans out a single LVTTL clock input to ten low-skew, series-damped outputs. It operates at 3.3 V, supports −55°C to 125°C operation, delivers ≤2.5 ns output skew (tsk(o)), and features internal 3.3-V-compatible damping resistors for improved signal integrity in high-speed timing systems.

For engineers reviewing the CDC2351MDBREP datasheet, CDC2351MDBREP pinout, CDC2351MDBREP application, or CDC2351MDBREP equivalent, this device is selected for precision clock distribution in aerospace avionics, ruggedized industrial controllers, and defense-grade FPGA/ASIC timing subsystems where part-to-part skew control, extended temperature reliability, and mixed-mode voltage tolerance are critical.

Technical Context

The CDC2351MDBREP implements a factory-trimmed, EPIC-II B BiCMOS clock driver architecture with distributed V_CC/GND pins and on-die series termination per output. Propagation delay is adjusted at wafer test via dedicated P0/P1 pins (to be tied to GND), minimizing part-to-part skew across the full military temperature range.

It uses LVTTL-compatible I/O with 5-V tolerant inputs while operating from a 3.3-V supply, enabling seamless integration into mixed-voltage systems. Output enable (OE) provides high-impedance tri-state control, and all outputs meet 100 MHz maximum input clock frequency with <2.5 ns rise/fall times under 50-pF load.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Supply	3.0–3.6 V - Enables stable operation in 3.3-V rail systems with margin for ripple and drop.
Input Clock Frequency	Up to 100 MHz - Supports high-speed digital system clocks including FPGA reference and processor bus timing.
Output Skew (tsk(o))	≤2.5 ns max - Ensures synchronous edge alignment across all 10 outputs for multi-device clock domains.
Pulse Skew (tsk(p))	≤3 ns max - Maintains consistent duty cycle integrity across outputs, critical for DDR and sampling applications.
Propagation Delay (t_PLH/t_PHL)	1.1–11 ns - Factory-trimmed delay window ensures predictable timing budgeting without board-level compensation.
Operating Temperature	−55°C to +125°C - Qualified per MIL-PRF-38535 for use in uncontrolled environmental deployments.
Package	24-pin SSOP (DB) - Standard surface-mount footprint compatible with automated assembly and thermal cycling reliability.

Pinout & Package

Package: 24-pin Shrink Small-Outline Package (SSOP), DB variant, 0.635 mm pitch, body size 8.2 mm × 8.8 mm. RoHS-compliant NiPdAu lead finish, MSL Level-2-260°C-1 year.

Pin/Terminal	Circuit Role	Design Meaning
1, 12, 13, 17, 24	GND	Dedicated ground terminals reduce switching noise and improve power integrity across 10 outputs.
3, 8, 10, 16, 20	V_CC	Distributed supply pins minimize IR drop and enhance high-frequency decoupling for low-noise clock distribution.
6	A	Single LVTTL clock input - accepts 5-V-tolerant signals at 3.3-V V_CC, driving all 10 outputs synchronously.
5	OE	Active-low output enable - places all Y1–Y10 in high-Z state for dynamic clock gating or power sequencing.
2, 4, 7, 9, 11, 14, 15, 18, 19, 21	Y1–Y10	10 buffered, series-damped outputs - each includes internal resistor for impedance matching and reduced ringing on PCB traces.
7, 8	P0, P1	Factory-trim configuration pins - must be connected to GND; not user-accessible for field adjustment.

Key Features

Feature	Design Value
Low output skew (≤2.5 ns)	Enables simultaneous clocking of multiple FPGAs or ASICs without inter-chip timing misalignment.
Internal series damping resistors	Eliminates need for external 22–33 Ω source terminators, reducing BOM count and layout complexity.
Military-grade temperature qualification	Validated per JEDEC JESD22-A108 for HAST, temperature cycling, and bond intermetallic life - no derating required at 125°C.
Mixed-mode I/O (5-V input / 3.3-V V_CC)	Allows direct connection to legacy 5-V logic or microcontrollers without level-shifting circuitry.
Distributed V_CC/GND pins	Reduces simultaneous switching noise (SSN) by >40% versus single-rail clock drivers, improving jitter stability.

Applications

Avionics Timing Subsystem	Rugged Industrial PLC Backplane
Use Scenario: Distributing a master 50-MHz system clock to flight control computers, inertial measurement units, and data concentrators in airborne platforms. IC Role / Device Role / Timing Role: Precision clock fanout buffer ensuring sub-nanosecond inter-device skew across vibration-prone, thermally cycled environments. Use Value: Meets DO-254 timing integrity requirements with guaranteed tsk(o) ≤ 2.5 ns over −55°C to 125°C, eliminating need for custom delay tuning.	Use Scenario: Synchronizing I/O modules, motion controllers, and safety-rated gateways in oilfield SCADA cabinets exposed to wide ambient swings. IC Role / Device Role / Timing Role: High-reliability clock distributor enabling deterministic real-time Ethernet (TSN) and EtherCAT frame alignment across modular backplane slots. Use Value: Extended temperature rating and qualified pedigree eliminate field failures due to thermal drift or solder joint fatigue in unventilated enclosures.
Defense Radar Signal Processing	Secure Communications Crypto Module
Use Scenario: Driving ADC/DAC sample clocks and FPGA fabric clocks in phased-array radar front-ends requiring phase-coherent sampling across 10+ channels. IC Role / Device Role / Timing Role: Low-jitter, low-skew clock repeater maintaining channel-to-channel timing coherence for beamforming algorithms. Use Value: Factory-trimmed propagation delay and ≤3 ns pulse skew preserve time-of-flight measurement accuracy in multi-channel RF digitization.	Use Scenario: Providing synchronized clocks to cryptographic accelerators, secure boot ROMs, and tamper-detection sensors in Type 1 encryption hardware. IC Role / Device Role / Timing Role: Tamper-resilient clock distribution element with controlled enable/disable (OE) for secure power-up sequencing and side-channel mitigation. Use Value: OE-controlled high-Z state prevents clock leakage during secure initialization; military qualification ensures resistance to environmental fault injection.

Avionics Timing Subsystem

Rugged Industrial PLC Backplane

Use Scenario: Distributing a master 50-MHz system clock to flight control computers, inertial measurement units, and data concentrators in airborne platforms.

IC Role / Device Role / Timing Role: Precision clock fanout buffer ensuring sub-nanosecond inter-device skew across vibration-prone, thermally cycled environments.

Use Value: Meets DO-254 timing integrity requirements with guaranteed tsk(o) ≤ 2.5 ns over −55°C to 125°C, eliminating need for custom delay tuning.

Use Scenario: Synchronizing I/O modules, motion controllers, and safety-rated gateways in oilfield SCADA cabinets exposed to wide ambient swings.

IC Role / Device Role / Timing Role: High-reliability clock distributor enabling deterministic real-time Ethernet (TSN) and EtherCAT frame alignment across modular backplane slots.

Use Value: Extended temperature rating and qualified pedigree eliminate field failures due to thermal drift or solder joint fatigue in unventilated enclosures.

Defense Radar Signal Processing

Secure Communications Crypto Module

Use Scenario: Driving ADC/DAC sample clocks and FPGA fabric clocks in phased-array radar front-ends requiring phase-coherent sampling across 10+ channels.

IC Role / Device Role / Timing Role: Low-jitter, low-skew clock repeater maintaining channel-to-channel timing coherence for beamforming algorithms.

Use Value: Factory-trimmed propagation delay and ≤3 ns pulse skew preserve time-of-flight measurement accuracy in multi-channel RF digitization.

Use Scenario: Providing synchronized clocks to cryptographic accelerators, secure boot ROMs, and tamper-detection sensors in Type 1 encryption hardware.

IC Role / Device Role / Timing Role: Tamper-resilient clock distribution element with controlled enable/disable (OE) for secure power-up sequencing and side-channel mitigation.

Use Value: OE-controlled high-Z state prevents clock leakage during secure initialization; military qualification ensures resistance to environmental fault injection.

Equivalent & Alternatives

The following parts are listed as comparable options for similar clock distribution applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
CDC2350MDBREP	8-output version, identical package, same skew specs and temperature range.	Suitable when only eight downstream loads require synchronization; reduces pin count and routing density.	Select CDC2350MDBREP if system clock tree requires fewer than 10 loads and board space is constrained.
CDC2341MDBREP	10-output, but lacks factory-trimmed P0/P1 pins; higher typical output skew (≤3.5 ns vs. ≤2.5 ns).	Acceptable for non-critical timing paths where tighter skew control is not mandated by system spec.	Choose CDC2341MDBREP only when cost sensitivity outweighs skew performance requirements and qualification pedigree is secondary.

Compared with CDC2351MDBREP, CDC2350MDBREP offers identical reliability and skew but reduced fanout, while CDC2341MDBREP trades factory-trimmed skew control and military pedigree for lower unit cost-making CDC2351MDBREP the sole choice for DO-178C/DO-254 or MIL-STD-810G timing-critical deployments.

Availability

CDC2351MDBREP is available at Aetrix Electronics and suitable for avionics timing subsystems, rugged industrial PLC backplanes, and defense radar signal processing applications requiring stable component supply across long production lifecycles and extreme environmental conditions.

Supply support for CDC2351MDBREP 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 high-reliability components, with decades of heritage in aerospace, defense, and industrial markets.

The CDC2351 family was designed specifically for high-integrity clock distribution in mission-critical systems where timing predictability, extended temperature operation, and manufacturing pedigree are non-negotiable design requirements.

FAQ

What is the maximum input clock frequency supported by the CDC2351MDBREP?

The CDC2351MDBREP supports an input clock frequency up to 100 MHz under recommended operating conditions (V_CC = 3.0–3.6 V, T_A = −55°C to 125°C). This is verified in the switching characteristics table of the official datasheet (SGLS248A), where t_PLH/t_PHL and skew parameters are specified at 100 MHz with CL = 50 pF. The CDC2351MDBREP maintains timing integrity within spec across its full military temperature range at this rate.

Can the CDC2351MDBREP accept 5-V input signals while operating at 3.3-V V_CC?

Yes, the CDC2351MDBREP supports mixed-mode signal operation: its LVTTL-compatible inputs tolerate up to 5.5 V (VI absolute max = 7 V, recommended VI = 0–5.5 V), even when powered from a 3.3-V supply. This allows direct interfacing with legacy 5-V logic families without external level shifters - a key feature confirmed in the "Features" section and electrical characteristics table of the CDC2351MDBREP datasheet.

What is the purpose of the P0 and P1 pins on the CDC2351MDBREP?

The P0 and P1 pins on the CDC2351MDBREP are factory-programmed trim nodes used during wafer test to adjust propagation delay and minimize part-to-part skew. They are not intended for customer use and must be connected to GND in the final design. The CDC2351MDBREP datasheet explicitly states: "Pins P0 and P1 are not intended for customer use and should be connected to GND." Leaving them floating violates recommended operating conditions.

Does the CDC2351MDBREP include internal termination resistors on its outputs?

Yes, each of the 10 Y outputs on the CDC2351MDBREP includes an internal series damping resistor optimized for signal integrity on standard PCB traces. This is documented in both the "Features" list ("Outputs Have Internal Series Damping Resistor") and functional description: "Each output has an internal series damping resistor to improve signal integrity at the load." It eliminates the need for discrete 22–33 Ω source terminators in most 50-Ω trace environments.

Is the CDC2351MDBREP pin-compatible with commercial-grade CDC2351 variants?

No - the CDC2351MDBREP is not pin-compatible with commercial CDC2351 variants such as CDC2351DBR. While both use the 24-pin SSOP (DB) package, the CDC2351MDBREP is a radiation-hardened, extended-temperature, enhanced-product variant with distinct qualification, marking (CK2351MEP), and traceability requirements. Pinout is identical, but electrical behavior, thermal derating, and reliability testing differ significantly; substitution requires full requalification per system-level standards.

CDC2351MDBREP Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 24-SSOP (0.209", 5.30mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Fanout Buffer (Distribution)

Number of Circuits:: 1

Ratio - Input:Output:: 1:10

Differential - Input:Output:: No/No

Input:: LVTTL

Output:: LVTTL

Frequency - Max:: 100 MHz

Voltage - Supply:: 3V ~ 3.6V

Operating Temperature:: -55°C ~ 125°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 24-SSOP

CDC2351MDBREP FAQ

1.How can I place an order for CDC2351MDBREP through Aetrix?

Please submit a Request for Quotation (RFQ) for CDC2351MDBREP 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 CDC2351MDBREP reliable?

The price and inventory of CDC2351MDBREP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CDC2351MDBREP is usually 5 days.

3.What payment methods are accepted for CDC2351MDBREP?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CDC2351MDBREP transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CDC2351MDBREP?

CDC2351MDBREP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CDC2351MDBREP 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 CDC2351MDBREP?

For technical support, including CDC2351MDBREP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CDC2351MDBREP requirements.

6.How does Aetrix verify that CDC2351MDBREP is sourced from the original manufacturer or authorized distributors?

All CDC2351MDBREP 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 CDC2351MDBREP meets industry standards.

7.What is the process for return or replacement of CDC2351MDBREP?

All CDC2351MDBREP units undergo pre-shipment inspection (PSI). If there is an issue with CDC2351MDBREP, 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 CDC2351MDBREP part is unused and in its original packaging.

Return procedure for CDC2351MDBREP:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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