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LTC1921

Features: ` Independently Monitors Two 48V Supplies for Undervoltage Faults: 38.5V ±1VMAX Overvoltage Faults: 70V ±1.5VMAX` Accurately Detects Undervoltage Fault Recovery: 43V ±0.5VMAX` Monitors Two External Fuses` Operates from 10V to 80V` Tolerates DC Faults to 100V` Tolerates Accidental Suppl...

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SeekIC No. : 004401953 Detail

LTC1921: Features: ` Independently Monitors Two 48V Supplies for Undervoltage Faults: 38.5V ±1VMAX Overvoltage Faults: 70V ±1.5VMAX` Accurately Detects Undervoltage Fault Recovery: 43V ±0.5VMAX` Monitors T...

LTC1921 Data Sheet

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Part Number:
LTC1921
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

` Independently Monitors Two 48V Supplies for
   Undervoltage Faults: 38.5V ±1VMAX
   Overvoltage Faults: 70V ±1.5VMAX
` Accurately Detects Undervoltage Fault Recovery:
   43V ±0.5VMAX
` Monitors Two External Fuses
` Operates from 10V to 80V
` Tolerates DC Faults to 100V
` Tolerates Accidental Supply Reversal to 100V
`Withstands Transient Voltages Up to 200V/200V
` Small Footprint: 8-Lead MSOP Package
` Requires No Precision External Components
` Specified from 40 to 85


Application

· Telecom Backplanes or Switch Cards
· Networking Backplanes or Switch Cards
· High Voltage Fuse Monitoring


Pinout

Connection Diagram


Specifications

(Note 1) All voltages referred to RTN
Supply Voltage
(VA, VB, FUSE A, FUSE B) ......................... 100V to 100V
Transient Voltage (VA, VB, FUSE A, FUSE B)
(Note 2) ......................................................... 0V to 200V
Transient Voltage (VA, VB, FUSE A, FUSE B)
(Note 2) ...................................................... 0V to 200V
OUT A, OUT B, OUT F Pins ............................ 0.3V to 8V
Maximum Junction Temperature ............................ 150
Operating Temperature Range
     LTC1921CMS8 ......................................... 0 to 70
     LTC1921IMS8 ..................................... 40 to 85
Storage Temperature Range ................. 65 to 150
Lead Temperature (Soldering, 10 sec).................. 300


Description

The LTC®1921 monitors two independent 48V supplies, including their fuses, and drives up to three optoisolators to indicate status, in accordance with standard backplane specifications. Requiring only three noncritical resistors and optoisolators, the LTC1921 replaces multiple voltage comparators, a voltage reference and several precision resistors.

The monitor features dual supply overvoltage and undervoltage detection circuits. The preset trip thresholds include
overvoltage, undervoltage and undervoltage recovery that are guaranteed over temperature and meet or exceed common backplane specifications. Additional built-in circuitry detects the condition of supply fuses. Overvoltage and undervoltage detectors ignore fast supply transients, eliminating false detection. The LTC1921 operates from  10V to 80V with a typical power dissipation of less than 10mW.

The LTC1921 is available in an 8-pin MSOP package.




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