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HV257 Datasheet(PDF) 3 Page - Supertex, Inc |
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HV257 Datasheet(HTML) 3 Page - Supertex, Inc |
3 / 9 page 3 HV257 A122104 Symbol Parameter Min Typ Max Units Conditions Symbol Min Typ Max Units Conditions VPED Pedestal Voltage mV RSW Sample and Hold Switch resistance 5.0 K Ω C Sample and Hold Capacitor 10 pF RDROOP Droop rate during hold time relative to input 2.0 V/s VSIG Input voltage range 5.0 TSU Set-up time-address to enable 75 ns TH Hold time-address to enable bar 75 ns VIH Input logic high voltage 2.4 D D V VIL Input logic low voltage 1.2 lIH Input logic high current 1.0 µA = VIH D D lIL Input logic low current -1.0 µA 0 = VIL PIV Peak inverse voltage 5.0 cathode to anode V F Forward diode drop If = 100 µA, anode to cathode@25OC I F Forward diode current 100 µA anode to cathode T C V F temperature coefficient -2.20 C ˚ / V m anode to cathode 0 V Parameter Symbol Min Typ Max Units Conditions Parameter V V V V 0 V V 1.0 12.0 input referred output referred 0.60 Acceptable Power Up Sequences 1) V PP 2) V NN 3) V DD 4) Inputs & Anode or 1) V NN 2) V DD 3) V PP 4) Inputs & Anode Acceptable Power Down Sequences 1) Inputs & Anode 2) V DD 3) V NN 4) V PP or 1) Inputs & Anode 2) V PP 3) V DD 4) V NN Power Up/Down Sequence The device can be damaged due to improper power up / down sequence. To prevent damage, please follow the acceptable power up /down sequences and add two external diodes as shown in the diagram below. The first diode is a high voltage diode across VPP and VDD where the anode of the diode is connected to VDD and the cathode of the diode is connected to Vpp. Any low current high voltage diode such as a 1N4004 will be adequate. The second diode is a schottky diode across VNN and DGnd where the anode of the schottky diode is connected to VNN and the cathode is connected to DGnd. Any low current schottky diode such as a 1N5817 will be adequate. VDD VPP 1N4004 or similar VNN DGND 1N5817 or similar Sample and Hold Logic Decoder Diode |
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