MS9331C HD Signal Re-timer IC
The MacroSilicon MS9331C is an HD signal re-timer IC with a maximum signal rate of 3 Gbps, supporting I2S and SPDIF audio output. At 3 Gbps, it supports HD input resolutions up to 4K x 2K @ 30 Hz and 4K x 2K (YCbCr420) @ 60 Hz, with 10/12/16-bit color depth.
The HD input includes clock and data recovery (CDR) with adaptive EQ to accommodate cables of different lengths and quality, helping maintain TMDS performance at high rates. The HD output provides signal pre-emphasis for longer cable runs. The chip integrates internal EDID RAM and requires no external crystal.
Key Specifications
| Item | Specification |
|---|---|
| Product type | HD signal re-timer (1 in, 1 out) |
| Maximum signal rate | 3 Gbps |
| Video interfaces | 1x DVI/HD input, 1x DVI/HD output |
| Maximum resolution | 4K x 2K @ 30 Hz; YCbCr420 4K x 2K @ 60 Hz |
| Color depth | 10/12/16-bit input/output |
| Audio output | I2S, SPDIF; 32 kHz to 192 kHz |
| Audio formats | Compressed and uncompressed audio formats |
| HD input | Adaptive EQ; automatic input monitoring |
| HD output | Pre-emphasis; automatic sink monitoring |
| DDC | 5 V TTL DDC channel |
| EDID | Integrated 512-byte EDID RAM |
| Clock | No external crystal required |
| Package | QFN48 |
Block Diagram
The block diagram shows the HD input CDR/EQ, re-timing, pre-emphasized output, audio extraction, and EDID management inside MS9331C.
Key Features
- Single-channel HD re-timing for longer links or signal regeneration.
- Supports 4K @ 30 Hz and YCbCr420 4K @ 60 Hz high-bandwidth formats.
- Integrated I2S/SPDIF digital audio output with multiple sample rates.
- Adaptive input EQ and output pre-emphasis for different cable conditions.
- Built-in EDID RAM for sink capability emulation and management.
- No external crystal required, simplifying BOM.
Typical Applications
- HD long-reach transport and signal regeneration
- Signal conditioning in matrices and distribution front ends
- HD extension solutions with digital audio output
- Conference, security, and professional AV HD link repeaters
Design Notes
- Confirm target resolution, color depth, audio output mode, and package fit during selection.
- Validate EDID strategy, DDC timing, and HDCP behavior with downstream devices.
- Refer to the official MacroSilicon datasheet for electrical parameters, power, and pinout.
References
Notes
This page is based on the official MacroSilicon product page. Confirm parameter limits, package dimensions, and production support with the latest datasheet and project validation.