The EL4581 is a device designed to extract timing information from standard negative video sync signals found in NTSC, PAL, and SECAM broadcast systems, as well as non-standard formats and computer graphics systems at higher scan rates. It provides a reliable method of determining the correct sync slide level by setting it to the mid-point between the sync tip and blanking level at the back porch. The device has noise rejection capabilities and compensates for input signal variations.
The EL4581 extracts timing information from standard video sync signals (NTSC, PAL, SECAM) and can be programmed for non‑standard formats by adjusting an external resistor. It provides composite sync, vertical sync, burst/back‑porch, and odd/even outputs, with a built‑in linear‑phase low‑pass filter that attenuates the chroma signal.
The device is supplied in 8‑pin PDIP (EL4581CN) and 8‑pin SO (EL4581CS) packages, operates from a single +5 V supply, and draws typically 1.5 mA. It is pin‑compatible with the LM1881 and offers improved performance and lower power consumption.
| Supply voltage | +5 V (single supply) |
|---|---|
| Typical supply current | 1.5 mA |
| Operating temperature range | -40 °C to +85 °C |
| Package options | 8‑Pin PDIP (EL4581CN) and 8‑Pin SO (EL4581CS) |
It operates from a single +5 V supply.
The typical supply current is about 1.5 mA.
The device is offered in 8‑Pin PDIP (EL4581CN) and 8‑Pin SO (EL4581CS) packages.