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參數資料
| 型號： | EL1056CM |
| 英文描述： | Monolithic High-Speed Pin Driver |
| 中文描述： | 單片高速管腳驅動 |
| 文件頁數： | 3/16頁 |
| 文件大小： | 311K |
| 代理商： | EL1056CM |
EL1056ACEL1056C
Monolithic High-Speed Pin Driver
Applications Information
Contd
1056 – 28
Figure 3 Output Stage Circuit in Tristate Mode
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 50
X 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
11
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