Renesas 2308-5HPGGI

Overview

2308-5HPGGI from Renesas Electronics is a 3.3V zero-delay clock multiplier IC implementing a high-speed phase-lock loop (PLL) for precise clock distribution and multiplication. It supports 10–133.3 MHz input frequency, delivers reference/2 output on both banks, features eight CMOS outputs (4 per bank), and operates across –40°C to +85°C industrial temperature range in 16-pin TSSOP package - used in SDRAM timing control and telecom backplane synchronization.

For engineers reviewing the 2308-5HPGGI datasheet, 2308-5HPGGI pinout, 2308-5HPGGI application, or 2308-5HPGGI equivalent, key selection criteria include its fixed ÷2 output ratio per bank, external feedback architecture for skew control, low 200 ps cycle-to-cycle jitter at 133.3 MHz (15 pF), and industrial-grade reliability with tri-state enable per bank.

Technical Context

The 2308-5HPGGI implements an externally closed PLL using the FBK pin to align output phase with REF input, achieving true zero delay by matching propagation path delays. Its dual-bank architecture (CLKA1–CLKA4 and CLKB1–CLKB4) allows independent enable/disable via S1/S2 control logic, supporting test-mode direct-through clocking and automatic power-down when REF is absent.

This variant is specifically configured for reference/2 output on both banks (per IDT2308-5H specification), with high-drive capability (12 mA sink/source), 1.25 ns fall time (30 pF load), and optimized for 15 pF loads up to 133.3 MHz input - distinct from -1/-2/-3/-4 variants offering 1x/2x/4x options.

Key Specifications

Pinout & Package

2308-5HPGGI is housed in a 16-pin Thin Shrink Small Outline Package (TSSOP), 4.4 mm × 5.0 mm body, 0.65 mm pitch, RoHS-compliant and Pb-free ("G" suffix). Pin 1 is REF (5 V-tolerant reference clock input); pins 2–3, 14–15 are Bank A outputs; pins 6–7, 10–11 are Bank B outputs; pins 4 and 13 are VDD (3.3 V); pins 5 and 12 are GND; pins 8–9 are S2/S1 select inputs; pin 16 is FBK (external PLL feedback input).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT2308-5HDCGI, 2308-5HPGGI saves >50% board area and improves thermal dissipation in airflow-limited enclosures; compared with ICS853S05I, it provides adjustable zero-delay operation essential for multi-drop clock trees with variable trace lengths.

Availability

2308-5HPGGI is available at Aetrix Electronics and suitable for SDRAM memory subsystems, telecom line cards, server motherboards, industrial PLC backplanes, and critical-path delay designs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 2308-5HPGGI 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 specializing in microcontrollers, analog, power, and timing solutions, with deep expertise in high-reliability industrial and automotive electronics.

The IDT2308 family - acquired from Integrated Device Technology - was designed for high-speed, low-skew clock distribution in memory, telecom, and computing infrastructure where deterministic phase alignment is non-negotiable.

FAQ

What is the maximum input frequency supported by the 2308-5HPGGI?

The 2308-5HPGGI supports a maximum input frequency of 133.33 MHz, as confirmed in the switching characteristics table for -5H devices under 20 pF load conditions. This limit applies regardless of output configuration since the -5H variant is fixed at REF/2 output ratio on both banks, and the PLL core is rated for this input rate across the full industrial temperature range.

Does the 2308-5HPGGI require an external RC network for PLL operation?

No, the 2308-5HPGGI does not require an external RC network. Its PLL is designed for external feedback via the FBK pin, eliminating the need for passive loop-filter components. This simplifies layout, improves repeatability, and avoids temperature drift associated with discrete RC elements - a key differentiator from older clock multiplier architectures.

How is zero delay achieved in the 2308-5HPGGI, and what determines its accuracy?

Zero delay in the 2308-5HPGGI is achieved by closing the PLL feedback loop externally through the FBK pin connected to one output. Delay accuracy depends on matched loading between the FBK-driven output and all other outputs - equal 15 pF loads yield <±250 ps REF-to-output delay (t6), while load mismatches shift delay predictably per the Output Load Difference Chart in the datasheet.

Can both output banks of the 2308-5HPGGI be disabled independently?

Yes, the 2308-5HPGGI supports independent bank disable via the S1 and S2 select inputs. Per the Function Table, setting S2=L/S1=H disables Bank B only, while S2=H/S1=L disables Bank A only. Both banks enter tri-state when S2=L/S1=L, and both remain active when S2=H/S1=H - enabling flexible power sequencing and domain isolation in complex systems.

What is the power-down current specification for the 2308-5HPGGI at industrial temperature?

At industrial temperature (–40°C to +85°C), the 2308-5HPGGI draws ≤25 µA in power-down mode (REF = 0 MHz, S1 = S2 = HIGH), as specified in the DC Electrical Characteristics – Industrial table. This ultra-low quiescent current enables energy-efficient standby operation without requiring external enable circuitry or voltage gating.