Renesas 8543BGILF

Overview

8543BGILF from Integrated Device Technology (IDT) is a low-skew, 1-to-4 differential-to-LVDS fanout buffer designed for high-performance clock distribution in timing-critical systems. It accepts dual differential inputs (CLK/nCLK or PCLK/nPCLK), delivers four LVDS output pairs, supports up to 650 MHz output frequency, features 40 ps max output skew and 0.164 ps typical additive phase jitter, and operates across –40°C to +85°C in a lead-free 20-lead TSSOP package.

For engineers reviewing the 8543BGILF datasheet, 8543BGILF pinout, 8543BGILF application, or 8543BGILF equivalent, this device serves as a precision clock fanout solution where deterministic skew, LVDS signal integrity, input flexibility (LVPECL/LVDS/SSTL/HCSL), and synchronized clock enable are required in telecom infrastructure, FPGA/ASIC clock trees, and high-speed serial interface timing subsystems.

Technical Context

The 8543BGILF implements a fully differential signal path with two independent input selection modes: CLK/nCLK supports LVPECL, LVDS, LVHSTL, SSTL, and HCSL; PCLK/nPCLK supports LVPECL, CML, and SSTL. Its internal clock enable (CLK_EN) is synchronously gated to prevent runt pulses, and OE provides additional output control.

It operates exclusively at 3.3 V, guarantees LVDS-compliant outputs (200–360 mV differential swing, 1.125–1.375 V common-mode offset), and maintains tight timing specifications - including 2.6 ns max propagation delay, 600 ps max part-to-part skew, and validated performance up to 650 MHz under full-load conditions.

Key Specifications

Pinout & Package

8543BGILF is housed in a lead-free 20-lead TSSOP (G package), 6.5 mm × 4.4 mm × 0.925 mm body, JEDEC MO-153 compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar differential-to-LVDS fanout buffer applications.

Compared with 8543BGILF, Si53301-D-GM adds jitter cleaning but sacrifices input versatility, while PI6C557-03LEX offers voltage flexibility and sequenced control but omits dual-differential input support - making 8543BGILF uniquely suited for heterogeneous clock source environments requiring both LVDS and LVPECL interfacing without external components.

Availability

8543BGILF is available at Aetrix Electronics and suitable for telecom infrastructure, FPGA-based prototyping, and industrial automation systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for 8543BGILF 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 timing, memory interface, RF, and sensor solutions for communications, computing, and industrial markets.

The 8543BGILF belongs to IDT's HiPerClockS™ fanout buffer family, engineered specifically for low-jitter, low-skew clock distribution in high-speed digital systems where signal integrity and deterministic timing are non-negotiable.

FAQ

What input signal standards does the 8543BGILF support?

The 8543BGILF supports two differential input configurations: CLK/nCLK accepts LVPECL, LVDS, LVHSTL, SSTL, and HCSL levels; PCLK/nPCLK accepts LVPECL, CML, and SSTL. Single-ended LVCMOS signals can also be applied to CLK/nCLK using resistor biasing on nCLK, per Figure 2 in the datasheet. All inputs operate with 3.3 V supply and meet specified VPP and VCMR ranges.

Does the 8543BGILF require external termination resistors for LVDS outputs?

Yes - the 8543BGILF LVDS outputs require 100 Ω differential termination at the receiver end to maintain signal integrity and prevent reflections. The datasheet recommends placing a 100 Ω resistor across each output pair (e.g., between Q0 and nQ0) at the far end of the transmission line. Unused outputs may be left floating or similarly terminated, but traces must be stub-free if floating.

How does the CLK_EN pin differ from the OE pin on the 8543BGILF?

CLK_EN is a synchronous clock enable that gates the internal clock path and is internally resynchronized to avoid runt pulses; it affects only clock propagation, not output DC states. OE is an asynchronous output enable that forces all four LVDS output pairs into high-impedance mode regardless of clock activity. Both are LVCMOS/LVTTL-compatible, but CLK_EN ensures glitch-free clock gating while OE provides fast output disable for power management.

Is the 8543BGILF pin-compatible with other members of the ICS8543 family?

Yes - the 8543BGILF shares identical pinout, package (20-lead TSSOP), and functional interface with other ICS8543BGI variants (e.g., 8543BGILFT, 8543BGI). Differences are limited to packaging (tube vs. tape-and-reel) and RoHS compliance (LF suffix), not electrical or mechanical design. No PCB layout changes are required when substituting within the same temperature grade (–40°C to +85°C).

What is the maximum guaranteed output frequency for the 8543BGILF?

The 8543BGILF is guaranteed to operate up to 650 MHz across its full temperature and voltage range (–40°C to +85°C, 3.3 V ±5%). This specification is verified per Table 5 in the datasheet and applies to all four LVDS output pairs under matched 100 Ω loads. Performance beyond 650 MHz is not characterized or guaranteed.