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PDF ISL7457SRH Data sheet ( Hoja de datos )
| Número de pieza | ISL7457SRH | |
| Descripción | Quad CMOS Driver | |
| Fabricantes | Intersil Corporation | |
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Extending the TID Capability of the ISL7457SRH
®
Application Note
March 17, 2009
AN1458.0
ISL7457SRH TID Rating
The ISL7457SRH is specified for 10krads(Si) minimum TID
in SMD 5962-08230 when continuously biased as shown in
Figure 1.
In many cases a 10krad(Si) TID rating is not adequate to
meet mission requirements, so a method to extend the TID
capability is desired. Figure 2 shows a radiation exposure
circuit that biases the ISL7457SRH only 20% of the time. For
the other 80% of the time, the ISL7457SRH is unbiased.
Devices irradiated in this manner have demonstrated
acceptable post-rad parametric limits after 50krad(Si) TID,
as indicated in the Electrical Specification tables of this
application note. Please note, however, that the post-50krad
electrical specifications shown herein are not specified in or
guaranteed by SMD 5962-08230.
Imaging Applications
Some camera CCD driver applications do not require 100%
availability. In these situations, the ISL7457SRH can be left
unbiased until there is a need to image. When imaging is
required, the ISL7457SRH can be quickly biased by simply
closing a switch. As long as the duty-cycle of the application
does not exceed 20%, the TID capability can be extended up
to 50krad(Si).
Conclusions
A simple method to extend the TID capability of the
ISL7457SRH to 50krad(Si) has been described. This
method can be applied to any space-based system that uses
the device as long as 20% availability is acceptable.
R1
R2 R1
U1
INA VS+
R1
OE OUTA
VS
INB OUTB
VL ISL7457SRH NC
GND
VH
R1
R1
NC OUTC
INC OUTD
R1
IND VS- C1 R1
C1 = 100n
R1 = 15k
R2 = 10k
VS = 15V
R1
FIGURE 1. RAD EXPOSURE CIRCUIT (BIAS DUTY CYCLE =
100%)
DUTY CYCLE (SWITCH OPEN) = 80%
DUTY CYCLE (SWITCH CLOSED) = 20%
SW1
SPST
R1
R2
U1
INA VS+
OE OUTA
VS
INB OUTB
VL ISL7457SRH NC
GND
VH
NC OUTC
INC OUTD
IND VS-
C1 = 100n
R1 = 15k
R2 = 10k
VS = 15V
R1
R1
R1
R1
R1
C1 R1
R1
FIGURE 2. RAD EXPOSURE CIRCUIT (BIAS DUTY CYCLE =
20%)
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2009. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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