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DG459 Datasheet(PDF) 9 Page - Vishay Siliconix |
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DG459 Datasheet(HTML) 9 Page - Vishay Siliconix |
9 / 13 page Document Number: 70064 S11-1029–Rev. H, 23-May-11 www.vishay.com 9 Vishay Siliconix DG458, DG459 This document is subject to change without notice. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 DETAILED DESCRIPTION The Vishay Siliconix DG458 and DG459 multiplexers are fully fault- and overvoltage-protected for continuous input voltages up to ± 35 V whether or not voltage is applied to the power supply pins (V+, V-). These multiplexers are built on a high-voltage junction-isolated silicon-gate CMOS process. Two n-channel and one p-channel MOSFETs are connected in series to form each channel (Figure 1). Within the normal analog signal range (± 10 V), the RDS(on) variation as a function of analog signal voltage is comparable to that of the classic parallel N-MOS and P-MOS switches. When the analog signal approaches or exceeds either supply rail, even for an on-channel, one of the three series MOSFETs gets cut-off, providing inherent protection against overvoltages even if the multiplexer power supply voltages are lost. This protection is good up to the breakdown voltage of the respective series MOSFETs. Under fault conditions only sub microamp leakage currents can flow in or out of the multiplexer. This not only provides protection for the multiplexer and succeeding circuitry, but it allows normal, undisturbed operation of all other channels. Additionally, in case of power loss to the multiplexer, the loading caused on the transducers and signal sources is insignificant, therefore redundant multiplexers can be used on critical applications such as telemetry and avionics. Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon Tech- nology and Package Reliability represent a composite of all qualified locations. For related documents such as package/tape drawings, part marking, and reliability data, see http://www.vishay.com/ppg?70064. Figure 5. Overvoltage Protection - 15 V - 15 V + 15 V - 35 V Overvoltage + 35 V Overvoltage Q1 Q2 Q3 n-Channel MOSFET is On p-Channel MOSFET is Off n-Channel MOSFET is Off - 15 V + 15 V D S G D S G D S G - 35 V Overvoltage + 35 V Overvoltage Q1 Q2 Q3 - 35 V n-Channel MOSFET is On p-Channel MOSFET is Off n-Channel MOSFET is Off (b) Overvoltage with Multiplexer Power On (a) Overvoltage with Multiplexer Power Off |
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