EL1056C 데이터 시트보기 (PDF) - Elantec -> Intersil

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EL1056C

Monolithic High-Speed Pin Driver

Elantec -> Intersil 

EL1056AC EL1056C

Monolithic High-Speed Pin Driver

Applications Information Contd

Figure 3 Output Stage Circuit in Tristate Mode

1056 – 28

Output Stage–Normal Mode

Capacitive loads can cause the output stage to

ring Little ringing occurs for loads less than

25 pF but substantial ringing for more than

40 pF 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 out-

put and a back-terminated line also serves to iso-

late the driver from capacitive loads and short-

circuits The slewrate of the driver slows by

about 10% when driving a 50X 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 tristated but it slows the output small-

signal risetime by about 10% (although not slew-

rate) When placed on the driver side of the back-

match resistor no speed reduction occurs in

normal mode but the cable is more poorly termi-

nated in tristate

The transient currents that occur when driving

capacitive or back-matched loads can be very

high approaching 100 mA The driver is capable

of outputting a peak of 140 mA but long-term

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