1

All data sheets are subject to change without notice

(858) 503-3300 - Fax: (858) 503-3301 - www.maxwell.com

Nuclear Event Detector

HSN-2000

©2005 Maxwell Technologies

All rights reserved.

01.07.05 Rev 3

•

Detects ionizing radiation pulses

•

Tested/certified detection threshold level

•

Adjustable circumvention period

•

100% testable with built-in test

•

Detection threshold adjustability

•

Single +5V operation

•

Designed-in radiation hardness

•

•

Flat pack (F) or DIP (L) packages

•

•

•

•

•

Maxwell Technologies Specified, Controlled, and Tested

Maxwell Technologies’ HSN-2000 radiation-hardened Hybrid

Nuclear Event Detector (NED) senses ionizing radiation pulses

generated by a nuclear event, such as the detonation of a nuclear

weapon, and rapidly switches its output from the normal high

state to a low state with a propagation delay time of less than 20

ns. The active low Nuclear Event Detection signal (NED) is used

to initiate a wide variety of circumvention functions, thus prevent-

ing upset and burnout of electronic components. The NED output

is also used to initiate both hardware and software recovery. This

high-speed, 14-pin hybrid detector is used in electronic systems

as a general-purpose circumvention device to protect memory,

stop data processing, and drive power supply switches as well as

signal clamps.

The HSN-2000 is designed to operate through three critical envi-

device is designed to function throughout the transient neutron

pulse. The hybrid’s discrete design ensures a controlled response

in these radiation environments as well as immunity to latchup.

The detection level and functionality of a sample of each HSN-

2000 production lot are tested in an ionizing dose rate environ-

ment. A certificate is provided reporting the test results for the

production lot.

The detection threshold of the HSN-2000 is adjustable within the

can be preset by Maxwell or adjusted by the user. Less than a

30% variation in detection threshold can be expected over the

entire operating temperature range.

1.

Manufactured for Maxwell Technologies by Teledyne Microelectronic

Technologies to MIL-PRF-38534, Class H, no RHA

Logic Diagram

Detector

(Pin Diode)

Amplifier

Pulse Timer

LED

Logic

Latch

12

4

5

7

6

8

9

14

1

2

13

11

V

H

V

L

Threshold

Adjust

V

B

BIT

GND

CRC

Flag

Reset

Flag

Reset

NEF

NED

10 k

Ω

10 k

Ω