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

Texas Instruments CDC328ADBR

Name: CDC328ADBR
Brand: Texas Instruments
SKU: CDC328ADBR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CDC328ADBR

Manufacturer:: Texas Instruments

Category:: Clock Buffers, Drivers

Package:: 16-SSOP (0.209", 5.30mm Width)

Datasheet:: CDC328ADBR.pdf

Description:: IC CLK BUFFER 1:6 100MHZ 16SSOP

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Product details

Overview

CDC328ADBR from Texas Instruments is a 1:6 clock distribution buffer IC with polarity control, designed for low-skew clock fanout in synchronous digital systems. It accepts one TTL-compatible clock input (A), delivers six buffered outputs (Y1–Y4, Y1′–Y2′), supports true/complementary output selection via four T/C inputs, operates at up to 100 MHz, and features ±48-mA drive strength with 1-ns max output skew.

For engineers reviewing the CDC328ADBR datasheet, CDC328ADBR pinout, CDC328ADBR application, or CDC328ADBR equivalent, this device is selected for high-speed clock distribution where deterministic phase alignment, noise-immune layout (distributed VCC/GND), and flexible output polarity are required in industrial control, telecom timing, and FPGA/ASIC clock tree designs.

Technical Context

The CDC328ADBR implements a single-input, six-output clock driver using Texas Instruments' EPIC-II^B BiCMOS process, enabling high-speed switching (tPLH/tPHL ≤ 5 ns) with low power dissipation. Its architecture includes independent polarity-control logic per output pair (1T/C–4T/C), allowing mixed true/complementary configurations without external inverters.

It uses distributed VCC and GND pins (pins 1, 4, 7, 11, 14) to minimize simultaneous switching noise, and supports TTL-level input thresholds (VIL = 0.8 V, VIH = 2 V) with rail-to-rail output swing under load (VOH ≥ 2 V at −48 mA, VOL ≤ 0.5 V at 48 mA).

Key Specifications

Parameter	Value and Actual Design Meaning
Input Clock Frequency	Up to 100 MHz - supports high-speed system clocks in DSPs, FPGAs, and packet-switching hardware.
Output Skew (tsk(o))	≤1 ns - ensures tight timing alignment across all six outputs for synchronous sampling and setup/hold compliance.
Output Drive Strength	−48 mA / +48 mA - drives multiple TTL loads or short PCB traces without external buffers.
Propagation Delay	1.5–5 ns - enables precise delay budgeting in clock tree synthesis and jitter-sensitive applications.
Supply Voltage Range	4.75 V to 5.25 V - compatible with standard 5-V logic rails and tolerant of typical board-level ripple.
Operating Temperature	−40°C to +85°C - qualified for industrial and telecom infrastructure environments.
Input Capacitance (Ci)	3 pF - minimizes loading on upstream clock sources such as crystal oscillators or PLL outputs.

Pinout & Package

Package: 16-pin Shrink Small-Outline Package (SSOP-DB), 5.3 mm × 6.2 mm body, 0.65 mm pitch, RoHS-compliant NIPDAU finish, MSL Level-1.

Pin/Terminal	Circuit Role	Design Meaning
1	GND	Ground reference for output stage and internal logic; one of five dedicated GND pins for noise reduction.
2	1Y2	Complementary output of first pair (inverted relative to 1Y1 when 1T/C = H).
3	2Y1	True output of second pair; driven directly from input A when 2T/C = L.
4	GND	Dedicated ground pin adjacent to high-speed outputs to suppress crosstalk and supply bounce.
5	2Y2	Complementary output of second pair; polarity controlled by 2T/C input.
6	3Y	True output of third pair; no complementary counterpart - fixed polarity.
7	GND	Third GND pin placed between output groups to isolate switching currents.
8	4Y	True output of fourth pair; independently controllable via 4T/C.
9	1Y1	True output of first pair; primary buffered replica of input A when 1T/C = L.
10	1T/C	Polarity control for outputs 1Y1/1Y2 - L = true/complement, H = complement/true.
11	VCC	Power supply pin; one of three VCC pins distributed to reduce IR drop and dynamic noise.
12	2T/C	Polarity control for outputs 2Y1/2Y2 - enables independent inversion per pair.
13	A	Primary clock input; TTL-compatible, accepts 0.8 V/2 V thresholds, drives internal buffer tree.
14	VCC	Second VCC pin - placed near center of package to stabilize core logic voltage.
15	3T/C	Unused in CDC328A - tied internally; not connected externally (no function).
16	4T/C	Polarity control for output 4Y - toggles 4Y between true and inverted states.

Key Features

Feature	Design Value
Low Output Skew (≤1 ns)	Enables synchronous operation across multi-chip systems without added deskew circuitry or delay tuning.
Independent Polarity Control (4× T/C inputs)	Allows per-output pair inversion - eliminates need for external inverters in mixed-signal clock routing.
Distributed VCC/GND Pins (5× GND, 3× VCC)	Reduces simultaneous switching noise and improves signal integrity in dense PCB layouts.
TTL-Compatible I/O	Interoperates directly with legacy 5-V microcontrollers, FPGAs, and ASICs without level-shifting.
High-Drive Outputs (±48 mA)	Drives ≥10 TTL loads or long traces without fanout buffers - simplifies BOM and layout.

Applications

Telecom Line Card Timing	FPGA Clock Tree Distribution
Use Scenario: Distributing a master reference clock to multiple SERDES PHYs, framer ICs, and control processors on a line card. IC Role / Device Role / Timing Role: Low-skew 1:6 fanout buffer with configurable polarity to match differential receiver inputs and clock-enable logic. Use Value: Eliminates inter-device skew-induced bit errors and meets ITU-T G.823 jitter accumulation limits.	Use Scenario: Feeding synchronized clocks to FPGA I/O banks, memory controllers, and internal logic regions. IC Role / Device Role / Timing Role: Clock distribution hub that maintains phase coherence across clock domains while supporting bank-specific polarity requirements. Use Value: Reduces clock insertion delay variation across FPGA pins, improving timing closure margin by >150 ps.
Industrial PLC Backplane Sync	DSP-Based Motor Control Module
Use Scenario: Synchronizing ADC sampling, PWM generation, and communication peripherals across modular I/O slots. IC Role / Device Role / Timing Role: Central clock repeater with isolated GND/VCC pins to prevent noise coupling between analog and digital backplane sections. Use Value: Maintains <1 ns inter-slot clock alignment, enabling deterministic real-time loop execution across distributed modules.	Use Scenario: Delivering matched-phase clocks to dual-core DSPs, gate drivers, and isolated ADCs in servo drives. IC Role / Device Role / Timing Role: Polarity-configurable buffer generating complementary clocks for H-bridge dead-time control and synchronized current sensing. Use Value: Enables precise 90° or 180° phase relationships between PWM and sampling edges without external delay networks.

Telecom Line Card Timing

FPGA Clock Tree Distribution

Use Scenario: Distributing a master reference clock to multiple SERDES PHYs, framer ICs, and control processors on a line card.

IC Role / Device Role / Timing Role: Low-skew 1:6 fanout buffer with configurable polarity to match differential receiver inputs and clock-enable logic.

Use Value: Eliminates inter-device skew-induced bit errors and meets ITU-T G.823 jitter accumulation limits.

Use Scenario: Feeding synchronized clocks to FPGA I/O banks, memory controllers, and internal logic regions.

IC Role / Device Role / Timing Role: Clock distribution hub that maintains phase coherence across clock domains while supporting bank-specific polarity requirements.

Use Value: Reduces clock insertion delay variation across FPGA pins, improving timing closure margin by >150 ps.

Industrial PLC Backplane Sync

DSP-Based Motor Control Module

Use Scenario: Synchronizing ADC sampling, PWM generation, and communication peripherals across modular I/O slots.

IC Role / Device Role / Timing Role: Central clock repeater with isolated GND/VCC pins to prevent noise coupling between analog and digital backplane sections.

Use Value: Maintains <1 ns inter-slot clock alignment, enabling deterministic real-time loop execution across distributed modules.

Use Scenario: Delivering matched-phase clocks to dual-core DSPs, gate drivers, and isolated ADCs in servo drives.

IC Role / Device Role / Timing Role: Polarity-configurable buffer generating complementary clocks for H-bridge dead-time control and synchronized current sensing.

Use Value: Enables precise 90° or 180° phase relationships between PWM and sampling edges without external delay networks.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ACT1093D	8-output, no polarity control; 3.3-V only; lower drive (±24 mA); 2.5 ns max skew.	Requires external inverters for complementary outputs; limited to 3.3-V systems.	Select when higher channel count is needed and polarity flexibility is not required.
CDCVF2310PW	10-output, LVCMOS I/O; 3.3-V; integrated termination; 0.3 ns typical skew.	Not TTL-compatible; requires level translation for 5-V interfaces; optimized for high-frequency serial links.	Select for modern 3.3-V systems demanding ultra-low skew and integrated impedance matching.

Compared with SN74ACT1093D and CDCVF2310PW, the CDC328ADBR uniquely balances 5-V TTL compatibility, per-pair polarity control, and sub-ns skew in a compact SSOP package - making it optimal for legacy and hybrid-voltage industrial clock trees where signal integrity and interface simplicity are critical.

Availability

CDC328ADBR is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and FPGA-based embedded systems requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.

Supply support for CDC328ADBR 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 precision timing and high-speed logic.

The CDC328A family was developed for high-reliability clock distribution in industrial and telecom equipment, emphasizing low skew, noise immunity, and robust 5-V operation without external support components.

FAQ

What is the maximum operating frequency of the CDC328ADBR?

The CDC328ADBR is characterized for reliable operation up to 100 MHz under recommended conditions (VCC = 4.75 V to 5.25 V, TA = −40°C to 85°C). This rating is verified by switching characteristics data showing tPLH/tPHL ≤ 5 ns and skew ≤ 1 ns across all outputs, making CDC328ADBR suitable for high-speed bus synchronization and FPGA clocking applications.

Does the CDC328ADBR support both true and complementary outputs simultaneously?

Yes - the CDC328ADBR supports mixed true and complementary outputs via four independent polarity-control inputs (1T/C–4T/C). For example, 1Y1/1Y2 can be configured as true/complement while 3Y remains true and 4Y is set to complement, all concurrently. This capability is confirmed in the function table and logic diagram of the CDC328ADBR datasheet.

What is the package type and footprint compatibility of the CDC328ADBR?

The CDC328ADBR uses a 16-pin Shrink Small-Outline Package (SSOP-DB) with 0.65 mm pitch, 5.3 mm × 6.2 mm body size, and Q1 pin-1 orientation. It is not pin-compatible with SOIC (D) variants like CDC328AD, due to different pad layout and thermal pad absence - PCB layout must use the DB drawing specified for CDC328ADBR.

How does the CDC328ADBR manage power supply noise during high-speed switching?

The CDC328ADBR reduces switching noise through distributed VCC (pins 11, 14) and GND (pins 1, 4, 7) connections - five total ground pins and three VCC pins strategically placed around the die perimeter. This layout minimizes ground bounce and supply rail collapse, as validated in the "Distributed VCC and GND Pins Reduce Switching Noise" feature statement and electrical test conditions of the CDC328ADBR datasheet.

Is the CDC328ADBR compliant with modern environmental standards?

Yes - the CDC328ADBR is RoHS-compliant (lead-free NIPDAU finish), rated MSL Level-1 (unlimited floor life at ≤30°C/60% RH), and qualified for industrial temperature range (−40°C to +85°C). These specifications are documented in TI's official Package Option Addendum and confirmed for CDC328ADBR in the production status table.

CDC328ADBR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 16-SSOP (0.209", 5.30mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Fanout Buffer (Distribution)

Number of Circuits:: 1

Ratio - Input:Output:: 1:6

Differential - Input:Output:: No/No

Input:: TTL

Output:: TTL

Frequency - Max:: 100 MHz

Voltage - Supply:: 4.75V ~ 5.25V

Operating Temperature:: -40°C ~ 85°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 16-SSOP

CDC328ADBR FAQ

1.How can I place an order for CDC328ADBR through Aetrix?

Please submit a Request for Quotation (RFQ) for CDC328ADBR 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 CDC328ADBR reliable?

The price and inventory of CDC328ADBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CDC328ADBR is usually 5 days.

3.What payment methods are accepted for CDC328ADBR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CDC328ADBR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CDC328ADBR?

CDC328ADBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CDC328ADBR 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 CDC328ADBR?

For technical support, including CDC328ADBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CDC328ADBR requirements.

6.How does Aetrix verify that CDC328ADBR is sourced from the original manufacturer or authorized distributors?

All CDC328ADBR 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 CDC328ADBR meets industry standards.

7.What is the process for return or replacement of CDC328ADBR?

All CDC328ADBR units undergo pre-shipment inspection (PSI). If there is an issue with CDC328ADBR, 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 CDC328ADBR part is unused and in its original packaging.

Return procedure for CDC328ADBR:

1.Submit a request within 90 days.

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

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