Renesas 2309-1HDCG

Overview

2309-1HDCG from Renesas Electronics is a 3.3V zero-delay clock buffer IC with phase-lock loop (PLL) architecture, distributing one reference clock to nine low-skew outputs (five in Bank A, four in Bank B), operating from 10MHz to 133MHz with <250ps output-to-output skew and <200ps cycle-to-cycle jitter, used in SDRAM clock distribution on PC motherboards and telecom datacom systems.

For engineers reviewing the 2309-1HDCG datasheet, 2309-1HDCG pinout, 2309-1HDCG application, or 2309-1HDCG equivalent, this high-drive variant supports industrial-grade timing integrity in memory subsystems, backplane clock trees, and critical-path delay-sensitive designs where precise I/O alignment and fast PLL lock (<1ms) are required.

Technical Context

The 2309-1HDCG implements an on-chip PLL that locks to the REF input and uses internal feedback from the CLKOUT pin to achieve zero input-output delay; its dual-bank output enable (S1/S2 control) allows independent tri-state of Bank A (CLKA1–CLKA4) and Bank B (CLKB1–CLKB4).

It operates at 3.3V supply (3.0–3.6V), supports both commercial (0°C to +70°C) and industrial (−40°C to +85°C) temperature ranges, and delivers high-drive capability (12mA sink/source per output) enabling direct drive of multiple loads without external buffers.

Key Specifications

Pinout & Package

2309-1HDCG is housed in a 16-pin SOIC package (Green, RoHS-compliant), measuring 10.3mm × 7.5mm × 2.3mm, with standard 1.27mm pitch and surface-mount compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT2309-1HDCGI, the 2309-1HDCG offers identical performance at lower cost for commercial environments; versus ICS8302AM-01LF, it provides higher drive, broader frequency support, and flexible bank control-critical for SDRAM and multi-ASIC clock trees.

Availability

2309-1HDCG is available at Aetrix Electronics and suitable for SDRAM memory subsystems, telecom line cards, and PC workstation motherboards requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 2309-1HDCG 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 IDT2309 product line was designed specifically for high-fidelity, zero-delay clock distribution in memory-intensive computing and communications platforms where deterministic timing and low jitter are non-negotiable.

FAQ

What is the maximum operating frequency of the 2309-1HDCG under 30pF load conditions?

The 2309-1HDCG supports up to 100MHz when driving 30pF loads per output, as specified in the switching characteristics tables for both commercial and industrial temperature ranges. At lighter 10pF loads, it achieves full 133MHz operation-making it suitable for DDR2/DDR3 memory clocking and high-speed serial interface references where load capacitance is tightly controlled.

Does the 2309-1HDCG require external passive components to operate its PLL?

No, the 2309-1HDCG integrates a complete PLL with on-chip feedback from the CLKOUT pin, eliminating the need for external resistors or capacitors in the loop filter. This simplifies PCB layout, improves reliability, and ensures consistent lock behavior across voltage and temperature variations without calibration.

How does the 2309-1HDCG achieve zero input-output delay, and what design conditions are required?

The 2309-1HDCG achieves zero I/O delay by aligning the REF input edge with the CLKOUT output edge (±350ps) using internal PLL feedback. To realize true zero delay, all outputs-including CLKOUT-must be equally loaded (e.g., same trace length and termination); unequal loading shifts the delay per the Output Load Difference diagram in the datasheet.

What is the power consumption of the 2309-1HDCG at 66.66MHz with all outputs unloaded?

At 66.66MHz with all outputs unloaded and SEL inputs tied to VDD or GND, the 2309-1HDCG draws ≤35mA supply current in industrial temperature range and ≤32mA in commercial range. Power-down current drops to ≤25µA when REF = 0MHz and S1/S2 = HIGH, enabling ultra-low standby power in battery-backed or energy-conscious systems.

Can the 2309-1HDCG replace the standard-drive IDT2309-1DCG in an existing design?

Yes, the 2309-1HDCG is pin-compatible and functionally identical to the IDT2309-1DCG, with enhanced ±12mA drive strength (vs. ±8mA) and faster rise/fall times (1.5ns vs. 2.5ns). No PCB changes are needed, but verify load capacitance and signal integrity margins-especially at >100MHz-due to increased slew rate and drive capability.