Renesas ISL54105ACRZ

Overview

ISL54105ACRZ from Renesas Electronics is a TMDS timing regenerator IC with three independent clock data recovery (CDR) channels, programmable equalization (1–13 dB at 800 MHz), and 50 Ω/100 Ω/hybrid termination for HDMI/DVI signal cleanup and cable extension up to 15 m. It delivers regenerated TMDS outputs aligned to a low-jitter PLL-derived clock, supporting pixel rates up to 165 MHz (guaranteed) and 225 MHz (typical). It is used in DVI/HDMI extenders and display interfaces requiring jitter reduction and signal integrity restoration.

For engineers reviewing the ISL54105ACRZ datasheet, ISL54105ACRZ pinout, ISL54105ACRZ application, or ISL54105ACRZ equivalent, key selection considerations include guaranteed 165 MHz operation, 32 ps clock output jitter, 52 ps data output jitter, programmable pre-emphasis and equalization, I²C-configurable termination, and thermal-pad QFN-72 package compatibility with high-speed PCB layout constraints.

Technical Context

The ISL54105ACRZ implements triple-channel CDR architecture with per-channel FIFOs and a shared PLL to regenerate clean TMDS clock and data signals. Each channel processes differential RX inputs (RX0±–RX2±, RXC±), applies adaptive equalization (register 0x08), and retimes data against the recovered clock before driving TX outputs (TX0±–TX2±, TXC±).

It supports both stand-alone operation via hardware pins (PD, ADDR[6:0], RESET) and I²C software control (SCL/SDA, 7-bit address), with register-accessible features including termination selection (50 Ω/100 Ω/high-Z), activity detection mode (AC vs. common-mode), PLL bandwidth (500 kHz–4 MHz), and transmit drive current (10–11.875 mA).

Key Specifications

Pinout & Package

The ISL54105ACRZ is housed in a 72-lead, 10 mm × 10 mm QFN package with exposed thermal pad (GND). Pin assignment follows L72.10x10B drawing; thermal pad must be low-impedance connected to PCB ground plane for electrical stability and thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar TMDS regenerator applications.

Compared with TI TDP158 and Maxim MAX9278, the ISL54105ACRZ offers guaranteed 165 MHz operation in a mature, pin-defined QFN-72 package with minimal external components (two calibration resistors), making it optimal for cost-sensitive, non-HDCP HDMI/DVI extender and signal conditioning applications where simplicity and proven interoperability are prioritized over next-gen protocol support.

Availability

ISL54105ACRZ is available at Aetrix Electronics and suitable for DVI/HDMI cable extension, display interface signal conditioning, and HDMI compliance test support requiring stable component supply, RoHS-compliant packaging, and industrial temperature range (0°C to +70°C) operation.

Supply support for ISL54105ACRZ 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 is a global semiconductor leader specializing in microcontrollers, analog, power management, and interface solutions for automotive, industrial, and consumer electronics.

The ISL54105ACRZ belongs to Renesas' high-speed interface product line, designed specifically for HDMI/DVI signal integrity restoration in display infrastructure-emphasizing jitter reduction, programmable equalization, and robust TMDS regeneration without protocol awareness.

FAQ

What is the maximum guaranteed pixel rate for the ISL54105ACRZ?

The ISL54105ACRZ guarantees operation up to 165 MHz pixel rate across the full temperature range (0°C to +70°C), supporting UXGA@60Hz and 1080p@60Hz DVI/HDMI signals. While some units operate up to 225 MHz, this higher rate is not production-tested or guaranteed per the FN6716 datasheet.

Does the ISL54105ACRZ support HDMI protocol features like HDCP or EDID?

No, the ISL54105ACRZ is a physical-layer TMDS regenerator only-it performs clock/data recovery, equalization, and retiming without interpreting or modifying HDMI protocol data such as HDCP encryption keys or EDID information. The ISL54105ACRZ passes all TMDS data transparently.

How does the ISL54105ACRZ handle inter-pair (channel-to-channel) skew?

The ISL54105ACRZ adds up to 2 bits of fixed inter-pair skew (e.g., 2.5 ns at 162.5 MHz) due to FIFO pointer alignment after input discontinuities (e.g., video mode changes). This is within HDMI/DVI receiver tolerance (≥6 bits), but limits cascading multiple ISL54105ACRZ devices in series without skew compensation.

What external components are required for basic operation of the ISL54105ACRZ?

Two external precision resistors are mandatory: a 1.0 kΩ ±1% resistor on RES_TERM (sets 50 Ω termination) and a 3.16 kΩ resistor on RES_BIAS (sets internal bias currents). Additionally, each VD and VD_ESD pin requires a 0.1 µF ceramic bypass capacitor to ground, and a Schottky diode (VF ≤ 0.4 V) must connect VD to VD_ESD for HDMI compliance.

Can the ISL54105ACRZ operate without I²C configuration?

Yes, the ISL54105ACRZ supports fully stand-alone operation using hardware pins (PD, RESET, ADDR[6:0]) and default register values. I²C is optional for advanced tuning-equalization, termination, PLL bandwidth, and activity detection mode can all be configured post-power-up without I²C, though software control enables dynamic adaptation.