FIN1104MTC - LVDS 4-Port Repeater 800Mbps 24-TSSOP | onsemi

LVDS Backplane Interconnect Extension

The FIN1104MTC fits backplane interconnects because long backplane traces, connectors, and vias attenuate LVDS transitions until receivers lose margin; the repeater's 800 Mbps capability regenerates full 330 mV differential swings mid-path, restoring eye opening without protocol awareness. Deployed as a mid-span redriver between line cards, each of its four channels independently services one differential pair, so a single device covers a quad-lane link or several lower-rate control pairs simultaneously. The ultra-low power dissipation stated in the onsemi datasheet matters in dense chassis where hundreds of links would otherwise add thermal load, and the reduced swing keeps chassis-level crosstalk and radiated emissions within budget even at full data rate.

Flat-Panel Display LVDS Link

Display links between timing controllers and panel receivers typically consume the full link budget across the TV or monitor cabling; the FIN1104MTC redrives these pairs with 330 mV LVDS swings that limit radiated emissions near display flex and ribbon cables, a key EMC consideration in consumer displays. Four channels align with common LVDS display link widths, and 800 Mbps operation covers standard pixel-clock rates for WXGA-to-UXGA class panels. Placement at the cable-to-board transition regenerates edges before the panel receiver, recovering setup-and-hold margin. Where the source is LVPECL or SSTL-2 from a legacy scaler, the FIN1104's direct input acceptance translates those levels to LVDS in the same 24-TSSOP footprint.

LVPECL / HSTL / SSTL-2 to LVDS Level Translation

According to the onsemi product page, the FIN1104 can directly accept LVPECL, HSTL, and SSTL-2 inputs for translation to LVDS outputs, making it a combined repeater and translator. Systems migrating from legacy PECL-based clock distribution to LVDS backplanes use the device at the interface boundary: the LVPECL driver's higher common-mode and swing fall within the FIN1104's input acceptance range, and the output stage delivers compliant 330 mV LVDS to the low-power side. This eliminates discrete translator networks, saving board area and component count. The VBB reference additionally permits AC coupling when source common-mode levels differ, giving designers coupling-architecture freedom within one 24-TSSOP device rated to 800 Mbps.

Clock Distribution and Fanout Buffering

High-speed clock trees degrade through fanout loading and trace loss; the FIN1104MTC serves as a repeater/fanout buffer in the onsemi Drivers and Fanout Buffers family, regenerating a clock pair before it reaches remote receivers. Its differential LVDS architecture preserves duty cycle and edge rate better than single-ended rebuffering, and 800 Mbps capacity supports clock frequencies up to 400 MHz at minimum pulse-width margins. The low 330 mV swing reduces clock harmonics radiating across the board, simplifying EMC compliance. Four independent channels let one device refresh multiple clock domains or provide separate deskewed paths to PLL inputs. AC coupling via VBB accommodates various source topologies without common-mode re-centering circuitry.

Server and Storage Interconnect

Server and storage chassis route LVDS-class signals across midplane connectors and long DIMM-to-controller paths where attenuation erodes margin; the FIN1104MTC redrives these links transparently at up to 800 Mbps per channel. Its ultra-low power dissipation, cited in the onsemi datasheet, is significant when deployed in multiples across a midplane, where cumulative repeater power affects chassis thermal design. The 24-TSSOP surface-mount package supports standard SMT assembly on both sides of high-layer-count boards. Low 330 mV output swing minimizes inter-pair crosstalk in the dense channel-to-channel routing typical of storage backplanes, and the VBB AC-coupling reference isolates DC offsets between cards powered from different supply domains.

Telecom Line-Card Signal Regeneration

Telecom line cards interface high-speed differential control and data pairs between the midplane and processing circuitry over long, lossy paths; the FIN1104MTC regenerates these LVDS links mid-path, restoring eye margins at 800 Mbps. Its tolerance of LVPECL inputs directly supports legacy telecom PECL clocking architectures, translating them to LVDS for modern low-power silicon in the same 24-TSSOP device. The low 330 mV swing and associated low EMI aid compliance with line-card emissions requirements, while ultra-low power suits high-density shelves populated with dozens of cards. VBB-based AC coupling spans the DC-offset differences that arise between midplane drivers and card-local repeaters in mixed-supply shelves, per the onsemi datasheet.