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Laptop Computer System

System View | Block Diagram
Protection Area Illustration (click to open larger image in new window)
  1. AC Power
  2. Buttons
  3. CD / DVD ROM
  4. CPU Protection
  5. DVI Port
  6. Ethernet
  7. Hard Drive
  8. HDMI Port
  9. Headphone Jack
  10. IEEE 1394 FireWire
  11. IEEE 1284 Parallel Port
  12. Laptop Speaker
  13. LCD Monitor Controller
  14. PCMCIA Card Slot
  15. Phone / Modem
  16. PS/2 Port
  17. RS-232
  18. SCSI I/O Bus
  19. S-Video
  20. USB 2.0 Port
Laptop Computer System

SCSI I/O Bus Protection

Problem: Short-circuit overload

The TERMPWR line on a SCSI port provides termination power for peripherals on the SCSI bus. A short-circuit anywhere on the bus can cause the entire bus and host to crash.
 

Solution: PolySwitch devices.

PolySwitch device can be used for circuit protection on the SCSI controller circuit and on each individual peripheral that is connected to the SCSI bus. PolySwitch devices limit the flow of dangerously high currents during fault conditions and reset back to normal operating mode once the fault condition is removed.

 

Read more about the Raychem Surface-mount (SMD) PolySwitch device

Applicable Product Series: microSMD, miniSMD, SMD.
Download SMD Datasheet - (pdf 439KB)
Agency Recognition: UL E74889, TÜV R9872049, R9872048, R2172061, CSA 078165_C_000.

 

Circuit Diagram / Schematic
 

Application Notes:

• SCSI Appnote (pdf 84KB)

Related Technical Information:
• Fundamentals of PolySwitch Overcurrent and Overtemperature Devices - (pdf 169KB)
• Selection Guide for PolySwitch Devices and Technology Summary - (pdf 1,550KB)
 

Competitor Cross-reference

Cross-reference competitor products
NOTE: You should already know the competitor part number to cross-reference it with our part.

Hard Drive PCMCIA Card Slot CD/DVD ROM IEEE 1394 FireWire USB 2.0 Port RJ-11 Phone/Modem Ethernet Port HDMI Port PS/2 Port S-Video CPU Protection LCD Monitor Controller SCSI I/O Bus Laptop Speaker Laptop Speaker LCD Monitor Controller/Inverter Laptop Speaker Buttons Buttons AC Power AC Power RS-232 Port IEEE 1264 Parallel Port DVI Port SCSI I/O Bus LCD Monitor Controller CPU Protection S-Video Hard Drive PS/2 Port HDMI Port Ethernet Port RJ-11 Phone/Modem USB 2.0 Port IEEE 1394 FireWire Headphone Jack PCMCIA Card Slot CD/DVD ROM Headphone Jack