HV256FG-G Supertex, HV256FG-G Datasheet - Page 5

• Manufacturer Part Number: HV256FG-G
• Description: Op Amps 32-Ch MEMS Drvr IC
• Manufacturer: Supertex

Specifications of HV256FG-G

• Operating Temperature (max): 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: MQFP-100
• Minimum Operating Temperature: - 10 C
• Lead Free Status / RoHS Status: Compliant

Power Up/Down Issues
External Diode Protection
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 on the right. 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.
Acceptable Power Up Sequences
The HV256 can be powered up with any of the following sequences
listed below.
Acceptable Power Down Sequences
The HV256 can be powered down with any of the following
sequences listed below.
Recommended Power Up/Down Timing
HV
OUT
1) VPP 2) VNN 3) VDD 4) Inputs and Anode
1) VNN 2) VDD 3) VPP 4) Inputs and Anode
1) VDD & VNN 2) Inputs 3) VPP 4) Anode
1) Inputs and Anode 2) VDD 3) VNN 4) VPP
1) Inputs and Anode 2) VPP 3) VDD 4) VNN
1) Anode 2) VPP 3) Inputs 4) VNN & VDD
Level at Power Up
HVOUT
VDD
VNN
VPP
VIN
HVOUT
VNN
VDD
VPP
●
1235 Bordeaux Drive, Sunnyvale, CA 94089
VNN Before VDD
Power Up Sequence
6.5V
-5.5V
0V
0V
0V
-5.5V
0V
5
External Diode Protection Connection
Suggested Power Up/Down Sequence
The HV256 needs all power supplies to be fully up and all channels
refreshed with V
Before that time, the high voltage outputs may have temporary
voltage excursions above or below GND level depending on
selected power up sequence. To minimize the excursions:
1. The VDD and VNN power supplies should be applied at the
same time (or within a few nanoseconds).
Suggested VPP ramp up speed should be 10msec or longer and
ramp down to be 1msec or longer.
HVOUT
VPP
VDD
VNN
●
VDD Before VNN
VDD
VNN
Tel: [phone]
SIG
= 0V to force all high voltage outputs to 0V.
1N4004 or similar
1N5817 or similar
Gnd +/- V offset X 72
Gnd +/- V offset X 72
●
6.5V
-5.5V
www.supertex.com
0V
0V
0V
6.5V
0V
DGND
VPP
300V
300V
6.5V
6.5V
-5.5V
-5.5V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
HV256