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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Clock Generators, PLLs, Frequency Synthesizers

Renesas 2305A-1DCGI

Name: 2305A-1DCGI
Brand: Renesas
SKU: 2305A-1DCGI
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2305A-1DCGI

Manufacturer:: Renesas

Category:: Clock Generators, PLLs, Frequency Synthesizers

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: 2305A-1DCGI.pdf

Description:: IC ZD BUFFER 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2305A-1DCGI from Renesas Electronics is an 8-pin SOIC zero-delay clock buffer IC with PLL-based phase alignment, operating from 10MHz to 133MHz at 3.3V supply, delivering five low-skew outputs (CLK1–CLK4 and CLKOUT) with <250ps output-to-output skew and <200ps cycle-to-cycle jitter - used in SDRAM clock distribution and telecom backplane timing.

For engineers reviewing the 2305A-1DCGI datasheet, 2305A-1DCGI pinout, 2305A-1DCGI application, or 2305A-1DCGI equivalent, key selection criteria include industrial temperature support (−40°C to +85°C), zero input-output delay architecture, 5-output fanout with internal feedback on CLKOUT, and compatibility with 5V-tolerant REF input in 3.3V systems.

Technical Context

The 2305A-1DCGI implements a single-loop PLL with on-chip feedback sourced from the CLKOUT pin, enabling precise phase alignment between REF input and all five outputs. It operates without external RC components and enters power-down mode (<25μA) when REF is inactive.

This device supports both 10pF (up to 133MHz) and 30pF (up to 100MHz) load conditions, maintains duty cycle stability (40–60% at 66.66MHz), and requires uniform capacitive loading across all outputs-including CLKOUT-to achieve true zero I/O delay and minimize skew.

Key Specifications

Parameter	Value and Actual Design Meaning
Operating Frequency	10 MHz to 133 MHz - supports SDRAM, PC motherboard, and datacom clocking at standard and high-speed rates
Supply Voltage	3.0 V to 3.6 V - compatible with 3.3V logic domains and tolerant of typical rail variation
Output Skew	<250 ps - ensures synchronous timing across five outputs for multi-lane memory or interface clocking
Cycle-to-Cycle Jitter	<200 ps pk-pk - meets tight jitter budgets for high-speed serial links and DDR interfaces
Power-Down Current	<25 μA at −40°C to +85°C - enables low-power idle states in industrial embedded systems
Input Voltage Range (REF)	−0.5 V to +5.5 V - accepts 5V-tolerant clock signals while powered from 3.3V supply
Delay, REF to CLKOUT	0 ±350 ps - achieves near-zero propagation delay critical for timing-critical control paths

Pinout & Package

2305A-1DCGI is housed in an 8-pin SOIC package (3.9mm × 4.9mm, 1.27mm pitch), RoHS-compliant and green (Pb-free).

Pin/Terminal	Circuit Role	Design Meaning
REF (Pin 1)	Input	5V-tolerant reference clock input; PLL lock source with VDD/2 threshold
CLK2 (Pin 2)	Output	Low-skew buffered clock output; requires matched load for zero-delay operation
CLK1 (Pin 3)	Output	Low-skew buffered clock output; identical electrical characteristics to CLK2–CLK4
GND (Pin 4)	Ground	Primary ground reference; decoupling capacitor must be placed adjacent to Pin 4 and Pin 6
CLK3 (Pin 5)	Output	Low-skew buffered clock output; shares same drive strength and timing as other outputs
VDD (Pin 6)	Power	3.3V supply input; requires local 0.1μF ceramic decoupling capacitor
CLK4 (Pin 7)	Output	Low-skew buffered clock output; part of 5-output bank synchronized by internal PLL
CLKOUT (Pin 8)	Output / Feedback	Primary PLL feedback node; must be loaded identically to other outputs to maintain zero I/O delay

Key Features

Feature	Design Value
Zero Input-Output Delay Architecture	PLL aligns REF and CLKOUT phases; enables deterministic timing in critical-path designs without added latency
Industrial Temperature Support	Rated for −40°C to +85°C operation - suitable for base station, industrial controller, and automotive infotainment timing
No External RC Network Required	On-chip PLL tuning eliminates external components, reducing BOM count and layout complexity
5V-Tolerant REF Input	Accepts legacy 5V clock sources directly into 3.3V system - avoids level-shifter circuitry
Tri-State Power-Down Mode	Outputs go high-impedance and current drops to <25μA - allows dynamic clock gating in multi-rail systems

Applications

SDRAM Clock Distribution	Telecom Line Card Timing
Use Scenario: Distributing a single master clock to multiple SDRAM chips on a memory module with strict setup/hold timing margins. IC Role / Device Role / Timing Role: Zero-delay clock buffer generating five synchronized, low-skew clocks for address/control/data strobes. Use Value: Eliminates cumulative trace delay mismatches and ensures simultaneous clock arrival across DRAM banks.	Use Scenario: Providing phase-aligned clocks to multiple DSPs, FPGAs, and SerDes transceivers on a telecom line card. IC Role / Device Role / Timing Role: PLL-based clock fanout IC maintaining sub-250ps skew across processing and interface domains. Use Value: Enables deterministic inter-device synchronization required for TDM and packet-processing pipelines.
Datacom Switch Fabric Clocking	PC Motherboard Reference Clock
Use Scenario: Driving clock inputs of multiple PHYs and MAC controllers in a 10G Ethernet switch ASIC subsystem. IC Role / Device Role / Timing Role: High-frequency (up to 133MHz), low-jitter clock repeater with industrial-grade reliability. Use Value: Meets IEEE 802.3 jitter compliance thresholds for multi-gigabit serial links without external cleanup.	Use Scenario: Generating stable, low-skew clocks for CPU, chipset, and peripheral controllers on an industrial PC motherboard. IC Role / Device Role / Timing Role: 3.3V zero-delay buffer supporting legacy and modern platform clock trees. Use Value: Reduces board-level timing margin loss caused by trace length differences and signal integrity degradation.

SDRAM Clock Distribution

Telecom Line Card Timing

Use Scenario: Distributing a single master clock to multiple SDRAM chips on a memory module with strict setup/hold timing margins.

IC Role / Device Role / Timing Role: Zero-delay clock buffer generating five synchronized, low-skew clocks for address/control/data strobes.

Use Value: Eliminates cumulative trace delay mismatches and ensures simultaneous clock arrival across DRAM banks.

Use Scenario: Providing phase-aligned clocks to multiple DSPs, FPGAs, and SerDes transceivers on a telecom line card.

IC Role / Device Role / Timing Role: PLL-based clock fanout IC maintaining sub-250ps skew across processing and interface domains.

Use Value: Enables deterministic inter-device synchronization required for TDM and packet-processing pipelines.

Datacom Switch Fabric Clocking

PC Motherboard Reference Clock

Use Scenario: Driving clock inputs of multiple PHYs and MAC controllers in a 10G Ethernet switch ASIC subsystem.

IC Role / Device Role / Timing Role: High-frequency (up to 133MHz), low-jitter clock repeater with industrial-grade reliability.

Use Value: Meets IEEE 802.3 jitter compliance thresholds for multi-gigabit serial links without external cleanup.

Use Scenario: Generating stable, low-skew clocks for CPU, chipset, and peripheral controllers on an industrial PC motherboard.

IC Role / Device Role / Timing Role: 3.3V zero-delay buffer supporting legacy and modern platform clock trees.

Use Value: Reduces board-level timing margin loss caused by trace length differences and signal integrity degradation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar zero-delay clock buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
IDT2305A-1HDCGI	Higher drive strength (12mA vs. 8mA), faster rise/fall times (1.5ns vs. 2.5ns), same pinout and package	Better suited for heavier capacitive loads (>20pF) or longer traces requiring stronger edge rates	Select 2305A-1HDCGI only if measured load exceeds 10–15pF per output or layout demands tighter edge control.
ICS8305AI-01LFT	Same 8-pin SOIC footprint, 3.3V operation, but uses external feedback resistor; no 5V-tolerant REF input	Lacks 5V tolerance and integrated PLL feedback - requires external component and careful loop compensation	Choose ICS8305AI-01LFT only when design already includes external RC tuning and REF is strictly 3.3V.

Compared with IDT2305A-1HDCGI and ICS8305AI-01LFT, the 2305A-1DCGI offers optimal balance of industrial temperature rating, 5V-tolerant input, and plug-and-play PLL operation - making it preferred for new designs where simplicity, robustness, and compatibility with mixed-voltage clock sources are prioritized.

Availability

2305A-1DCGI is available at Aetrix Electronics and suitable for SDRAM clock distribution, telecom line card timing, and PC motherboard reference clocking requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 2305A-1DCGI 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

Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and timing solutions for automotive, industrial, and infrastructure markets.

The IDT2305A product line - acquired from Integrated Device Technology - delivers zero-delay, low-skew clock fanout ICs optimized for high-reliability memory, telecom, and computing platforms requiring precise phase alignment and industrial-grade thermal performance.

FAQ

What is the operating temperature range for the 2305A-1DCGI?

The 2305A-1DCGI is rated for industrial temperature operation from −40°C to +85°C. This specification is confirmed in the Ordering Information table and Industrial Operating Conditions section of the official Renesas datasheet. The device draws less than 25μA in power-down mode across this full range, ensuring reliable behavior in harsh environments where the 2305A-1DCGI is deployed.

Does the 2305A-1DCGI require external components to operate?

No, the 2305A-1DCGI does not require external RC networks or loop-filter components. Its PLL is fully integrated with on-chip feedback sourced from the CLKOUT pin. Only standard power supply decoupling (0.1μF ceramic capacitor between VDD and GND) is needed. This simplifies layout and reduces BOM cost compared to alternatives requiring external tuning - a core design feature of the 2305A-1DCGI.

How many outputs does the 2305A-1DCGI provide, and what are their functions?

The 2305A-1DCGI provides five outputs: CLK1, CLK2, CLK3, CLK4, and CLKOUT. All five are functionally identical buffered clocks, but CLKOUT serves the dual role of output and internal PLL feedback node. To achieve zero input-output delay, CLKOUT must be loaded identically to the other outputs - a requirement explicitly defined in the 2305A-1DCGI datasheet's "Zero Delay and Skew Control" section.

Is the REF input of the 2305A-1DCGI 5V-tolerant?

Yes, the REF input (Pin 1) of the 2305A-1DCGI is 5V-tolerant, with an absolute maximum rating of −0.5V to +5.5V. This allows direct connection to legacy 5V clock sources without level-shifting circuitry, while the device itself operates from a 3.3V supply. This capability is documented in the Absolute Maximum Ratings table and confirmed in the PIN DESCRIPTION section of the 2305A-1DCGI datasheet.

What is the maximum load capacitance supported by the 2305A-1DCGI at 133MHz?

The 2305A-1DCGI supports up to 10pF load capacitance per output at frequencies up to 133MHz. At lower frequencies (<100MHz), it tolerates up to 30pF. These values are specified in both Commercial and Industrial Operating Conditions tables. Exceeding 10pF at 133MHz may degrade timing margins, increase jitter, or prevent PLL lock - a key constraint when routing the 2305A-1DCGI in high-speed designs.

2305A-1DCGI Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Active

Programmable:: Not Verified

Type:: Zero Delay Buffer

PLL:: Yes with Bypass

Input:: LVTTL

Output:: CMOS, LVCMOS, TTL

Number of Circuits:: 1

Ratio - Input:Output:: 1:5

Differential - Input:Output:: No/No

Frequency - Max:: 133MHz

Divider/Multiplier:: No/No

Voltage - Supply:: 3V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 8-SOIC

2305A-1DCGI FAQ

1.How can I place an order for 2305A-1DCGI through Aetrix?

Please submit a Request for Quotation (RFQ) for 2305A-1DCGI 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 2305A-1DCGI reliable?

The price and inventory of 2305A-1DCGI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2305A-1DCGI is usually 5 days.

3.What payment methods are accepted for 2305A-1DCGI?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2305A-1DCGI transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2305A-1DCGI?

2305A-1DCGI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2305A-1DCGI 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 2305A-1DCGI?

For technical support, including 2305A-1DCGI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2305A-1DCGI requirements.

6.How does Aetrix verify that 2305A-1DCGI is sourced from the original manufacturer or authorized distributors?

All 2305A-1DCGI 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 2305A-1DCGI meets industry standards.

7.What is the process for return or replacement of 2305A-1DCGI?

All 2305A-1DCGI units undergo pre-shipment inspection (PSI). If there is an issue with 2305A-1DCGI, 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 2305A-1DCGI part is unused and in its original packaging.

Return procedure for 2305A-1DCGI:

1.Submit a request within 90 days.

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

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