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IMP5219CPWT Datasheet(PDF) 4 Page - A1 PROs co., Ltd. |
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IMP5219CPWT Datasheet(HTML) 4 Page - A1 PROs co., Ltd. |
4 / 10 page 4 408-432-9100/www.impweb.com © 2000 IMP, Inc. Application Information IMP5219 Maximizes Line Current Cable transmission theory suggests to optimize signal speed and quality, the termination should act both as an ideal voltage refer- ence when the line is released (deasserted) and as an ideal current source when the line is active (asserted). Common active terminators which consist of linear regulators in series with resis- tors (typically 110 Ω) are a compromise. With coventional linear terminators as the line voltage increases the amount of current decreases linearly by the equation; The IMP5219, with its unique new architecture, applies the maxi- mum amount of current regardless of line voltage until the termination high threshold (2.85V) is reached. Acting as a near ideal line terminator, the IMP5219 closely repro- duces the optimum case when the device is enabled. To enable the device the Disable pin must be driven HIGH or left Open. When enabled, quiescent current is 6mA and the device will respond to line demands by delivering 24mA on assertion and by imposing 2.85V on de-assertion. Disable/Sleep Mode Disable mode places the device in a sleep state, where quiescent current typically 375 µA. When disabled, all outputs are in a high impedance state and output capacitance is a low 3pF. Sleep mode can be used for power conservation or to remove the terminator from the SCSI chain. An additional feature of the IMP5219 is its compatibility with active negation drivers. Table 1. Power Up/ Power Down Function Table e l b a s i Ds t u p t u Ot n e r r u C t n e c s e i u Q Hd e l b a n EA m 6 L h g i H / e l b a s i D e c n a d e p m I 5 7 3 µA n e p Od e l b a n EA m 6 s p e . 4 0 t _ 9 1 2 5 VV R I REF LINE − () = . Figure 3. 5219_03.eps 1 Meter, AWG 28 IMP5219 Receiver Driver IMP5219 Figure 1. Receiving Waveform – 20MHz Figure 2. Driving Waveform – 20MHz IMP5 IMP511111/5 1/5111122 IMP52 IMP521199 |
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