Nuclear Event Detector
HSN-500
V
B
8
9
Threshold
Adjust
V
H
14
V
L
1
Ω
10 k
Detector
(Pin Diode)
2
NED
Amplifier
Pulse Timer
BIT
6
LED
7
5
4
GND
C
RC
Logic Diagram
F
EATURES
:
•
•
•
•
•
•
•
•
•
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
Compliant to MIL-PRF-38534 Class H
1
Flat pack (F) or DIP (L) packages
D
ESCRIPTION
:
Maxwell Technologies’ HSN-500 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-500 is designed to operate through three critical envi-
ronments: ionizing dose rate [10
12
rad(Si)/s], gamma total dose
[10
6
rad(Si)], and neutron fluence [5 x 10
13
n/cm
2
]. In addition, the
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-
500 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-500 is adjustable within the
range of 2 x 10
5
rad(Si)/s to 2 x 10
7
rad(Si)/s. This detection level
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.
Memory
R
ADIATION
H
ARDNESS
C
HARACTERISTICS
•
•
•
•
•
Dose Rate (operate-through): 1 x
rad(Si)/sec
Total Dose: 1 x 10
6
rad(Si)
Neutron Fluence: 5 x 10
13
n/cm
2
Approximate Detection Range: 2 x 10
5
- 2 x 10
7
rad(Si)/sec
Maxwell Technologies Specified, Controlled, and Tested
10
12
1.
Manufactured for Maxwell Technologies by Teledyne Micoelectronic
Technologies to MIL-PRF-38534, Class H, no RHA
01.7.05 Rev 3
All data sheets are subject to change without notice
1
(858) 503-3300 - Fax: (858) 503-3301 - www.maxwell.com
©2005 Maxwell Technologies
All rights reserved.
MAXWELL [ MAXWELL TECHNOLOGIES ]
