EL1056 Ver la hoja de datos (PDF) - Intersil

Número de pieza

componentes Descripción

Fabricante

EL1056

Monolithic High-Speed Pin Driver

Intersil 

EL1056A, EL1056

FIGURE 3. OUTPUT STAGE CIRCUIT IN THREE-STATE MODE

Output Stage–Normal Mode

Capacitive loads can cause the output stage to ring. Little

ringing occurs for loads less than 25pF, but substantial

ringing for more than 40pF. Terminated transmission lines

cause no ringing, and actually suppress it as a snubber

does. A terminated line draws heavy DC current, however,

and greatly raises dissipation.

Driving a back-terminated line also causes little ringing and

does not cause DC dissipation. The series matching resistor

between the EL1056 output and a back-terminated line also

serves to isolate the driver from capacitive loads and short-

circuits. The slewrate of the driver slows by about 10% when

driving a 50Ω back-matched line, as seen at the end of the

line. The snubber can be on either side of the back-match

resistor. When placed on the line side it creates a high-

frequency termination for the line when the driver is three-

stated, but it slows the output small-signal risetime by about

10% (although not slewrate). When placed on the driver side

of the backmatch resistor, no speed reduction occurs in

normal mode but the cable is more poorly terminated in

three-state.

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