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ET4857
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General Description
The ET4857 is a SD 3.0-compliant bidirectional dual voltage level translator with auto-direction control. It is designed to interface between a memory card operating at 1.8V or 3.0V signal levels and a host with a nominal supply voltage of 1.2V to 1.8V. The IC supports SD3.0 SDR104、SDR50、DDR50、SDR25、SDR12 and SD2.0 High-Speed (50MHz) and Default-Speed (25MHz) modes. The device has an integrated voltage select-able low dropout regulator to supply the card-side I/Os, an auto-enable/disable function connected to the VSD supply pin.
Specification
Sample
Features
- Supports up to 208MHz clock rate
- SD3.0 specification-compliant voltage translation to support SDR104, SDR50, DDR50, SDR25, SDR12, High-Speed and Default-Speed modes
- 1.2V to 1.8V host side interface voltage support
- Feedback channel for clock synchronization
- 100mA Low dropout voltage regulator to supply the card-side I/Os
- Low power consumption by push-pull output stage with break-before-make architecture
- Automatic enable and disable through VSD
- Integrated pull-up and pull-down resistors: no external resistors required
- Integrated EMI filters suppress higher harmonics of digital I/Os
- Integrated 8kV ESD protection according to IEC 61000-4-2, level 4 on card side
- Level shifting buffers keep ESD stress away from the host (zero-clamping concept)
Technical Documentation
| Type | Title | Format | Date |
|---|---|---|---|
| Datasheet | ET4857 Datasheet | 2025-12-07 |
