EL4581C Elantec Semiconductor, Inc. (acquired by Intersil), EL4581C Datasheet
EL4581C
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EL4581C Summary of contents
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... Outputs are composite sync vertical sync burst back porch output and odd even output The later operates only in inter- laced scan formats The EL4581C provides a reliable method of determining correct sync slide level by setting it to the mid-point between sync tip and blanking level at the back porch This 50% level is deter- ...
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... EL4581C Sync Separator 50% Slice S-H Filter Absolute Maximum Ratings V Supply CC Storage Temperature Lead Temperature Important Note All parameters having Min Max specifications are guaranteed The Test Level column indicates the specific device testing actually performed during production and Quality inspection Elantec performs most electrical tests using modern high-speed automatic test ...
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... Odd Even field output Low during odd fields high during even fields Transitions occur at start of Vert Sync pulse Positive supply (5V) DD Note R must resistor SET EL4581C Sync Separator 50% Slice S-H Filter Signal voltages are peak to peak Temp Min ...
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... EL4581C Sync Separator 50% Slice S-H Filter Typical Performance Characteristics RSET vs Horizontal Frequency Vertical Default Delay Time vs RSET Back Porch Clamp On Time vs RSET Vertical Pulse Width vs Temperature Input Signal 300 mV e P-P EL4581 Filter Characteristic Constant Delay 240 ns 4 Vertical Pulse Width vs RSET Supply Current vs Temperature 4581 – ...
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... Back porch goes low for a fixed pulse width on the trailing edge of video input sync pulses Note that for serration pulses during vertical the back porch starts on the rising edge of the serration pulse (with propagation delay) Sync Separator 50% Slice S-H Filter Figure 1 5 EL4581C 4581 – 3 ...
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... EL4581C Sync Separator 50% Slice S-H Filter Figure 2 Figure 3 6 4581 – 5 4581 – 6 ...
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... Sync Separator 50% Slice S-H Filter Figure 4 Standard (NTSC Input) H Sync Detail 7 EL4581C 4581 – 7 ...
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... EL4581C Sync Separator 50% Slice S-H Filter Description of Operation A simplified block schematic is shown in Figure 2 The following description is intended to pro- vide the user with sufficient information to be able to understand the effects that the external components and signal conditions have on the outputs of the integrated circuit ...
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... Consequently the C S output will re- main low longer than the normal vertical pulse and OT period An external timing circuit could be used to detect this condition Figure 5 9 EL4581C 4581 – 4 ...
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... EL4581C Sync Separator 50% Slice S-H Filter General Disclaimer Specifications contained in this data sheet are in effect as of the publication date shown Elantec Inc reserves the right to make changes in the circuitry or specifications contained herein at any time without notice Elantec Inc assumes no responsibility for the use of any ...