Low Power Nuclear Event Detector (NED) High Reliability Electronic Modules for Extreme Environments • • • • • • • • Radiation hard to tactical/strategic nuclear environments Low power consumption at 2mA from single 5V supply Operates within specification over -55°C to +125°C Precise radiation detection level with single external resistor Accurate monostable pulse duration with single external capacitor 100% Detection tested Built-in self test Resettable output, bistable flag Industry Standard Packages • • 14 pin DIL package version qualified to MIL-PRF-38534 Class H 14 pin surface mount version (available if required, Class H qualification pending) API Technologies, in association with MBDA, introduces 15313A-DESC, a low power Nuclear Event Detector (NED) equipped with the latest materials and technology to mitigate the effect of nuclear weapon outputs. This cutting-edge product detects the event and sets a system flag which can either remove power from the electronics to be protected or drive the system into a known and controllable state. It is readily integrated into systems to support nuclear hardening. Addressing the problem of nuclear event detection Designing circuits to operate through an event requires specialist expertise. Ideally, electronic system hardware is designed to be ‘rad-hard’ to the necessary level. This requires the use of exotic semiconductor processing and technologies such as Silicon-On-Sapphire (SOS) or Silicon-On-Insulator (SOI). Many electronic functions are not realised in these technologies and devices currently available usually carry a major cost penalty. The Nuclear Event Detector is a highly effective, low cost solution for protecting system electronics exposed to a nuclear event by detecting and enabling power-down and allowing the system to be re-powered once the event has passed. System shutdown or power supply isolation can be implemented in response to the NED in a manner that avoids potentially permanent and catastrophic failures for example during crowbar protection. The system can then implement power-up in an appropriately controlled manner. Low Power NED Inputs and Outputs The NED has provision for setting a nominal trigger threshold between 1E3 and 1E6 Gy(Si)/s [1E5 and 1E8 rad(Si)/s] using a single external resistor. The detection output pulse width can be set between 10µs and >1s (nominal) with a single external capacitor. • • • Nuclear Event Flag (NEF) output - can be reset by either of two complementary inputs Nuclear Event Detection (NED) output Built-in test (BIT) AC Characteristics - Inputs Parameter Description Condition Min. TEST Pulse Width¶ Vtest=0 to 4V 250 FR Max. Units ns NED delay¶ 5 10 μs NEF delay 5 10 μs Pulse width Vfr=0 to 4V 250 NED delay NFR Typ. Pulse width ns 0.2 Vnfr=5 to 0.7V 1 500 NED delay μs ns 0.25 1 μs Typ. Max. Units 25 50 ns 50 200 ns 20 30 μs/nF AC Characteristics - Outputs Parameter Description Condition NED Delay NEF Delay Pull up=220ohms Pull up=220ohms Vh=4.5 to 5.5V Pulse width Min. 10 Notes : § Electrical characteristic specifications valid over full environmental ranges † Maximum charge during irradiation = 50nC ‡ Maximum charge into Rth input = 2nC excluding current into threshold set resistor ¶ NED active when TEST input active - pulse duration timed from negative edge of TEST input Outputs inactive during power up provided Vh rises at less than 5000 V/s (5 V/ms Absolute Maximum Ratings Parameter Limit Voltage at pins 6 11 12 and 14 w.r.t. pin 7 7.0V Voltage at pins 1 and 8 w.r.t. pin 7 20.0V Storage temperature range -65°C < Ta < +150°C Electrical Characteristics Maximum environmental operating conditions Parameter Limit Operating temperature range -55°C < Ta < +125°C Ionising radiation dose rate >1E8 Gy(Si)/s (>1E10 rad(Si)/s) Ionising total dose >100 Gy(Si) (>1E4 rad (Si)) Neutron fluence >1E13 n/cm² DC Characteristics - Power Parameter Symbol VH VH IH VL VB IB Min. Typ. Max. Units 4.5 5.0 5.5 V 2.0 mA 6.0 mA 15.0 mA 100 mA 20.0 V 100 μA 5.5 V 2.0 μA 100 mA Max. Units 0.7 V 1.0 mA Standby VH=5.5V Flag set VH=5.5V Operational VH=5.5V During irradiation VH=5.5V † VL IL VB Condition 4.5 VL=20.0V Standby / flag set Standby / flag set During irradiation VB=5V ‡ 4.5 15.0 5.0 DC Characteristics - Inputs Parameter Symbol FR Vil Iil Condition Vi=0.7V Vih Iih 0.5 Vi=3.0V 0.7 V 2.3 3.0 mA 2.1 3.0 V 0.7 V -3.0 mA Vil Iil Vi=0.7V Vih Iih -1.0 4.0 Vi=4.0V Vsw TEST Typ. 3.0 Vsw NFR Min. 0.8 V -0.1 -1.0 mA 0.7 2.0 V 0.7 V 1.0 mA Vil Iil Vi=0.7V Vih Iih 0.5 4.0 Vi=4.0V Vsw V 3.3 4.0 mA 0.7 2.1 3.0 V Min. Typ. Max. Units DC Characteristics - Outputs Parameter Symbol NED Voh Vol NEF Voh Vol Condition VL=20V Io=100μA Iol=10mA Iol=20mA VL=20V Io=100μA Iol=10mA Iol=20mA 18.5 V 0.6 V 0.7 V 18.5 V 0.6 V 0.7 V Low Power NED Outline Drawings and Pin Out Package Option Qualified to MIL-PRF-38534 Class H (Surface mount version available if required, qualification pending) DIMENSIONS in DIMENSIONS mm MIN MAX MIN MAX A - 0.145 - 3.68 b 0.16 0.022 0.41 0.56 D 0.490 0.500 12.45 12.70 Symbol 1. 2. e 0.100 BSC 2.54 BSC e1 0.600 BSC 15.24 BSC e2 0.295 0.305 7.49 7.75 E 0.790 0.800 20.06 20.32 L 0.195 0.215 4.95 5.46 S 0.095 0.105 2.41 2.68 Soldering leads, temperature of leads must not exceed 270ºC for a time of 10 seconds. Package must not be ultrasonically cleaned without prior consultation with RF2M Microelectronics Ltd. Ordering Information 15313A-DESC (SnPb solder) 15313-DESC (Gold) This product may be subject to export control regulations Pin Designation Description / function 1 VL 2 NED Nuclear Event Detection output - provides an active low output for the period set by the external timing capacitor. 3 n/c No connection 4 CB External timing capacitor (low) - connection for external timing capacitor. If an electrolytic capacitor is used, this pin should be connected to the -ve side. 5 CA External timing capacitor (high) - connection for external timing capacitor. If an electrolytic capacitor is used, this pin should be connected to the +ve side. 6 TEST Built in test input - provides means for electrical stimulation of the NED. 7 GND Ground and case 8 VB PIN diode bias supply - provides a separate supply to the radiation detector. 9 Rth External threshold set resistor - connection for the external radiation threshold set resistor. The other end of the resistor should be connected to ground (Pin 13). The resistor should be as close as possible to the NED. 10 n/c No connection 11 NFR Flag reset (active low) - provides an active low reset input to the NEF bistable. 12 FR 13 NEF Nuclear Event Flag output - provides an active low bistable output. The bistable output is set when the NED triggers. 14 VH Device supply - provides supply to the internal NED electronics. Output load supply - provides a supply to the NED and NEF outputs via internal 10 kohm resistors. External pull up resistors may also be used. Flag reset (active high) - provides an active high reset input to the NEF bistable. Whilst every effort is made to ensure the accuracy of the information contained in this document, no responsibility can be accepted for any errors and/or omissions. Descriptions and specifications of products are subject to change without notice. T: +44 (0) 1493 743100 E: [email protected] W: micro.apitech.co.uk T: +1 855.294.3800 W: www.apitech.com