HV2221

Features

HVCMOS technology for high performance

3.3 or 5.0V CMOS input logic level

20MHz data shift clock frequency

Very low quiescent power dissipation - 10µA

Low parasitic capacitance

DC to 10MHz analog signal frequency

-60dB typical off-isolation at 5MHz

CMOS logic circuitry for low power

Excellent noise immunity

Cascadable serial data register with latches

Flexible operating supply voltages

Applications

NDT metal flaw detection

Medical ultrasound imaging

Piezoelectric transducer drivers

Inkjet printer heads

Optical MEMS modules

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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

D

LE

CLR

SW1

D

LE

CLR

SW2

D

LE

CLR

SW6

D

LE

CLR

SW7

CLK

8-BIT

SHIFT

REGISTER

DIN

DOUT

LATCHES

LEVEL

SHIFTERS

OUTPUT

SWITCHES

VNN VPP

LE

CLR

VDD GND