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Features
- Withstands Transient Voltages Up to 200V/–200V
- Requires No Precision External Components
- 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
- Small Footprint: 8-Lead MSOP Package
- Specified from –40°C to 85°C
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The LTC1921 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 8-pin MSOP and SOIC packages.
Applications
- Telecom Backplanes or Switch Cards
- Networking Backplanes or Switch Cards
- High Voltage Fuse Monitoring
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LTC1921
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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LTC1921CMS8#PBF |
8-Lead MSOP
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| LTC1921CMS8#TRPBF |
8-Lead MSOP
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| LTC1921CS8#PBF |
8-Lead SOIC (Narrow 0.15 Inch)
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| LTC1921CS8#TRPBF |
8-Lead SOIC (Narrow 0.15 Inch)
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| LTC1921IMS8#PBF |
8-Lead MSOP
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| LTC1921IMS8#TRPBF |
8-Lead MSOP
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| LTC1921IS8#PBF |
8-Lead SOIC (Narrow 0.15 Inch)
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| LTC1921IS8#TRPBF |
8-Lead SOIC (Narrow 0.15 Inch)
|
|
- LTC1921CMS8#PBF
- Pin/Package Drawing
-
8-Lead MSOP
- Documentation
-
HTML
Material Declaration
-
HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
-
Ultra Librarian
-
SamacSys
- LTC1921CMS8#TRPBF
- Pin/Package Drawing
-
8-Lead MSOP
- Documentation
-
HTML
Material Declaration
-
HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
-
Ultra Librarian
-
SamacSys
- LTC1921CS8#PBF
- Pin/Package Drawing
-
8-Lead SOIC (Narrow 0.15 Inch)
- Documentation
-
HTML
Material Declaration
-
HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
-
Ultra Librarian
-
SamacSys
- LTC1921CS8#TRPBF
- Pin/Package Drawing
-
8-Lead SOIC (Narrow 0.15 Inch)
- Documentation
-
HTML
Material Declaration
-
HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
-
Ultra Librarian
-
SamacSys
- LTC1921IMS8#PBF
- Pin/Package Drawing
-
8-Lead MSOP
- Documentation
-
HTML
Material Declaration
-
HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
-
Ultra Librarian
-
SamacSys
- LTC1921IMS8#TRPBF
- Pin/Package Drawing
-
8-Lead MSOP
- Documentation
-
HTML
Material Declaration
-
HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
-
Ultra Librarian
-
SamacSys
- LTC1921IS8#PBF
- Pin/Package Drawing
-
8-Lead SOIC (Narrow 0.15 Inch)
- Documentation
-
HTML
Material Declaration
-
HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
-
Ultra Librarian
-
SamacSys
- LTC1921IS8#TRPBF
- Pin/Package Drawing
-
8-Lead SOIC (Narrow 0.15 Inch)
- Documentation
-
HTML
Material Declaration
-
HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
-
Ultra Librarian
-
SamacSys
Filter by Model
Part Models
Product Lifecycle
PCN
Oct 11, 2022
- 22_0244
Epoxy Change from Henkel 8290 to 8290A for MSOP Package
LTC1921CMS8#PBF
PRODUCTION
LTC1921CMS8#TRPBF
PRODUCTION
LTC1921IMS8#PBF
PRODUCTION
LTC1921IMS8#TRPBF
PRODUCTION
Feb 3, 2020
- 20_0128
Laser Top Mark for 8 Lead MSOP Packages Assembled in ADPG and UTAC
LTC1921CMS8#PBF
PRODUCTION
LTC1921CMS8#TRPBF
PRODUCTION
LTC1921IMS8#PBF
PRODUCTION
LTC1921IMS8#TRPBF
PRODUCTION
Oct 12, 2022
- 22_0255
Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)
LTC1921CS8#PBF
PRODUCTION
LTC1921CS8#TRPBF
PRODUCTION
LTC1921IS8#PBF
PRODUCTION
LTC1921IS8#TRPBF
PRODUCTION
Jun 16, 2021
- 21_0026
Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM
LTC1921CS8#PBF
PRODUCTION
LTC1921CS8#TRPBF
PRODUCTION
LTC1921IS8#PBF
PRODUCTION
LTC1921IS8#TRPBF
PRODUCTION
Filter by Model
Part Models
Product Lifecycle
PCN
Oct 11, 2022
- 22_0244
Epoxy Change from Henkel 8290 to 8290A for MSOP Package
LTC1921CMS8#PBF
PRODUCTION
LTC1921CMS8#TRPBF
PRODUCTION
LTC1921IMS8#PBF
PRODUCTION
LTC1921IMS8#TRPBF
PRODUCTION
Feb 3, 2020
- 20_0128
Laser Top Mark for 8 Lead MSOP Packages Assembled in ADPG and UTAC
LTC1921CMS8#PBF
PRODUCTION
LTC1921CMS8#TRPBF
PRODUCTION
LTC1921IMS8#PBF
PRODUCTION
LTC1921IMS8#TRPBF
PRODUCTION
Oct 12, 2022
- 22_0255
Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)
LTC1921CS8#PBF
PRODUCTION
LTC1921CS8#TRPBF
PRODUCTION
LTC1921IS8#PBF
PRODUCTION
LTC1921IS8#TRPBF
PRODUCTION
Jun 16, 2021
- 21_0026
Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM
LTC1921CS8#PBF
PRODUCTION
LTC1921CS8#TRPBF
PRODUCTION
LTC1921IS8#PBF
PRODUCTION
LTC1921IS8#TRPBF
PRODUCTION
Software & Part Ecosystem
| Parts | Product Life Cycle | Description | ||
|---|---|---|---|---|
|
Dual-Supply Monitors1 |
||||
|
RECOMMENDED FOR NEW DESIGNS |
100V Micropower Dual Voltage Monitor |
|||
Evaluation Kits 1
DC548A
LTC1921CMS8 | Dual -48V Suppy and Fuse Monitor
Product Detail
DC548A: Demo Board for LTC1921 Dual -48V Supply and Fuse Monitor.
Resources
