Renesas 8725BY-01LF

Overview

ICS8725BY-01 from Integrated Device Technology (IDT) is a differential-to-HSTL zero-delay clock generator with integrated PLL, configured as a 1:5 fanout buffer supporting output frequencies from 31.25 MHz to 700 MHz, input frequency range of 31.25–700 MHz, VCO range of 250–700 MHz, and static phase offset of ±135 ps - deployed in high-speed memory interfaces and telecom timing subsystems.

For engineers reviewing the ICS8725BY-01 datasheet, ICS8725BY-01 pinout, ICS8725BY-01 application, or ICS8725BY-01 equivalent, this page delivers verified electrical parameters, HSTL output behavior, external feedback configuration, PLL bypass mode operation, and LQFP-32 package layout guidance for synchronous system clock distribution.

Technical Context

The ICS8725BY-01 implements a fully integrated PLL with external differential feedback (FB_IN/nFB_IN) enabling true zero-delay clock regeneration. Its programmable reference, feedback, and output dividers support eight discrete output-to-input frequency ratios: 8:1, 4:1, 2:1, 1:1, 1:2, 1:4, 1:8.

It accepts LVPECL, LVDS, HSTL, HCSL, and SSTL differential inputs via dual selectable CLKx/nCLKx pairs, routes signals through a 3.3V core/1.8V output supply architecture, and provides five independent HSTL differential output pairs (Q0/nQ0 through Q4/nQ4) with ≤45 ps output skew and ≤25 ps cycle-to-cycle jitter.

Key Specifications

Pinout & Package

ICS8725BY-01 is housed in a 32-lead LQFP (Y package) with 0.8 mm pitch, 7 mm × 7 mm body, and 1.4 mm height per JEDEC MS-026 BBA outline. Power pins are segregated: VDD (pins 9, 32), VDDA (pin 30), VDDO (pins 16, 17, 24, 25) - enabling independent decoupling for core, analog, and output domains.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICS8725B-01 and ICS8725BY-01T, the ICS8725BY-01 offers identical clock generation performance and pin compatibility in a lead-free tray-packaged form - making it the preferred choice for new designs requiring RoHS 6 compliance and manual or low-volume SMT assembly.

Availability

ICS8725BY-01 is available at Aetrix Electronics and suitable for memory interface timing, telecom line card clocking, FPGA configuration distribution, high-speed test equipment synthesis, and industrial embedded timing applications requiring stable component supply and long-term lifecycle support.

Supply support for ICS8725BY-01 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

Integrated Device Technology (IDT), now part of Renesas Electronics, is a fabless semiconductor company specializing in high-performance timing, memory interface, RF, and power management solutions for communications, computing, and industrial markets.

The ICS8725BY-01 belongs to IDT's HiPerClockS™ family - engineered specifically for low-jitter, zero-delay clock distribution in high-speed digital systems including DDR memory subsystems, telecom infrastructure, and FPGA-based platforms.

FAQ

What is the function of the PLL_SEL pin on the ICS8725BY-01?

The PLL_SEL pin on the ICS8725BY-01 selects between PLL-regenerated clock (HIGH) and direct reference clock bypass (LOW). In bypass mode, the input clock is routed around the PLL into the output dividers - enabling system-level timing verification, jitter isolation testing, and debug without PLL lock dependency. This function is explicitly defined in Tables 3A and 3B of the ICS8725BY-01 datasheet.

Does the ICS8725BY-01 support both LVDS and LVPECL input standards?

Yes, the ICS8725BY-01 supports both LVDS and LVPECL differential inputs on its CLK0/nCLK0 and CLK1/nCLK1 pairs. Per Table 4C and Figure 3D–3C, the input common-mode voltage range (0.5 V to VDD – 0.85 V) and peak-to-peak swing (0.15–1.3 V) accommodate standard LVDS (±0.35 V) and 3.3 V LVPECL (≈0.8 V p-p) signaling - confirmed in the "Differential Clock Input Interface" section of the ICS8725BY-01 datasheet.

What is the maximum output skew specification for the ICS8725BY-01?

The ICS8725BY-01 specifies a maximum output skew of 45 ps between any two differential output pairs (e.g., Q0/nQ0 vs. Q4/nQ4) under equal load and supply conditions, as measured at differential crossing points (Table 6, tsk(o)). This value is guaranteed over 0°C to +70°C and applies to all five HSTL output pairs - critical for maintaining timing alignment across multi-rank memory or parallel data paths.

How is zero delay achieved in the ICS8725BY-01 clock generator?

Zero delay in the ICS8725BY-01 is achieved via external differential feedback: the FB_IN/nFB_IN pins connect a selected output (or post-divider signal) back to the internal phase detector. When locked, the PLL adjusts the VCO so the feedback path delay exactly matches the input-to-output propagation delay - resulting in net zero phase difference between input and regenerated outputs, with static phase offset bounded to ±135 ps (Table 6).

What are the power supply requirements for the ICS8725BY-01?

The ICS8725BY-01 requires three independent supplies: 3.3 V ±5% on VDD (pins 9, 32) and VDDA (pin 30) for core logic and analog PLL, and 1.8 V ±0.2 V on VDDO (pins 16, 17, 24, 25) for HSTL outputs. Per Table 4A, typical total current draw is 135 mA (core) + 16 mA (analog) + 0 mA (outputs, load-dependent), with recommended 0.01 µF bypass capacitors per supply pin and a 10 Ω + 10 µF RC filter on VDDA.