Supertex inc.

Supertex inc.

1235 Bordeaux Drive, Sunnyvale, CA 94089

Tel: 408-222-8888

www.supertex.com

HV2221

Features

Applications

General Description

The Supertex HV2221 is a low charge injection, 8-channel,

unipolar, negative high voltage, analog switch integrated

circuit (IC) intended for use in applications requiring high

voltage switching controlled by low voltage control signals,

such as NDT ultrasound flaw detection, medical ultrasound

imaging, piezoelectric transducer drivers, and printers.

Data is input into an 8-bit shift register that can then be

retained in an 8-bit latch. To reduce any possible clock feed-

through noise, the latch enable bar should be left high until all

bits are clocked in. Data is clocked in during the rising edge

of the clock.

Using HVCMOS technology, this device combines high

voltage bilateral DMOS switches and low power CMOS logic

to provide efficient control of high voltage analog signals.

Block Diagram

Low Charge Injection, 8-Channel,

Unipolar, Negative High Voltage, Analog Switch

D

LE

CLR

SW0

SW1

SW2

SW6

SW7

CLK

DIN

DOUT

Output

Switches

VNN VPP

LE CLR

VDD GND

8-Bit

Shift

Register

D

LE

CLR

D

LE

CLR

D

LE

CLR

D

LE

CLR

Level

Shifters

Latches