DocumentationDatasheet
Design Note
- DN123 - Ultralow Power Comparators Include Reference
- DN137 - New Comparators Feature Micropower Operation Under All Conditions
Reliability Data
Product Selector Card
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Features
- Ultralow Quiescent Current: 8.5μA Max
- Reference Output Drives 0.01μF Capacitor
- Adjustable Hysteresis (LTC1444/LTC1445)
- Wide Supply Range
Single: 2V to 11V
Dual: ±1V to ±5.5V - Input Voltage Range Includes the Negative Supply
- TTL/CMOS Compatible Outputs
- Propagation Delay: 12μs (Typ) (10mV Overdrive)
- No Crowbar Current
- 40mA Continuous Source Current
- Pin Compatible Upgrades for MAX924 (LTC1443)
- Low Profile (5mm × 4mm × 0.8mm) DFN Package
Typical Application
Description
The LTC®1443/LTC1444/LTC1445 are ultralow power quad comparators with a built-in reference. The comparators feature less than 8.5μA supply current over temperature, an internal reference (1.182V ±1% for LTC1443 or 1.221V ±1% for LTC1444/LTC1445), programmable hysteresis (LTC1444/LTC1445) and TTL/CMOS output (LTC1443/ LTC1445) that sinks and sources current (open-drain output for LTC1444). The reference output can drive a bypass capacitor of up to 0.01μF without oscillation.
The comparators operate from a single 2V to 11V supply or a dual ±1V to ±5.5V supply (LTC1443). Comparator hysteresis is easily programmable using two resistors and the HYST pin (LTC1444/LTC1445). Each comparator’s input operates from the negative supply to within 1.3V of the positive supply. The LTC1443/LTC1445 comparator output stage can continuously source up to 40mA. By eliminating the cross-conducting current that normally happens when the comparator changes logic states, power supply glitches are eliminated.
The LTC1443/LTC1444/LTC1445 are available in the 16-pin SO, PDIP and DFN packages.
5x4 DFN-16,N-16,SO-16
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC1444CDHD#PBF | DFN | 16 | C | $3.21 | $2.25 |
| LTC1444CDHD#TRPBF | DFN | 16 | C | $2.31 | |
| LTC1444CN#PBF | PDIP | 16 | C | $3.00 | $2.45 |
| LTC1444CS#PBF | SO | 16 | C | $3.00 | $2.45 |
| LTC1444CS#TRPBF | SO | 16 | C | $2.51 | |
| LTC1444IDHD#PBF | DFN | 16 | I | $3.86 | $2.70 |
| LTC1444IDHD#TRPBF | DFN | 16 | I | $2.76 | |
| LTC1444IN#PBF | PDIP | 16 | I | $3.50 | $2.95 |
| LTC1444IS#PBF | SO | 16 | I | $3.50 | $2.95 |
| LTC1444IS#TRPBF | SO | 16 | I | $3.01 | |
| LTC1444CN | PDIP | 16 | C | $6.00 | $4.90 |
| LTC1444CS | SO | 16 | C | $6.00 | $4.90 |
| LTC1444CS#TR | SO | 16 | C | $5.02 | |
| LTC1444IN | PDIP | 16 | I | $7.00 | $5.90 |
| LTC1444IS | SO | 16 | I | $7.00 | $5.90 |
| LTC1444IS#TR | SO | 16 | I | $6.02 | |
| LTC1444CDHD | DFN | 16 | C | $6.42 | $4.50 |
| LTC1444CDHD#TR | DFN | 16 | C | $4.62 | |
| LTC1444IDHD | DFN | 16 | I | $7.72 | $5.40 |
| LTC1444IDHD#TR | DFN | 16 | I | $5.52 |
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.