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Product Detailed Parameters
- Description：IC COMPARATOR 2 W/VOLT REF 8SO
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- Type：with Voltage Reference
- Number of Elements：2
- Output Type：Open-Drain
- Voltage - Supply, Single/Dual (±)：2.5V ~ 11V, ±1.25V ~ 5.5V
- Voltage - Input Offset (Max)：10mV @ 5V
- Current - Input Bias (Max)：-
- Current - Output (Typ)：-
- Current - Quiescent (Max)：5.7µA
- CMRR, PSRR (Typ)：80dB CMRR, 80dB PSRR
- Propagation Delay (Max)：12µs
- Hysteresis：50mV
- Operating Temperature：-40°C ~ 85°C
- Package / Case：8-SOIC (0.154", 3.90mm Width)
- Mounting Type：Surface Mount
- Supplier Device Package：8-SO
- Grade：-
- Qualification：-
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Overview
The LTC1843IS8#PBF is an ultralow power dual comparator with a built-in reference, manufactured by Analog Devices Inc. It operates from a single 2.5V to 11V supply or a dual ±1.25V to ±5.5V supply. The device features a typical supply current of 3.5μA and includes a 1.182V ±1% reference output capable of driving a 0.01μF capacitor. It offers programmable hysteresis via the HYST pin and open-drain outputs that typically sink greater than 20mA. Propagation delay is 12μs with 10mV overdrive. The input voltage range extends from the negative supply to within 1.3V of the positive supply.
Feature Summary
- Built-in 1.182V reference output for simplified circuit design
- Programmable hysteresis using external resistors connected to the HYST pin
- Open-drain outputs capable of sinking high currents without cross-conduction glitches
Applications
- Battery-powered system monitoring
- Threshold detectors
- Window comparators
- Oscillator circuits
Procurement Notes
Verify the specific IS8 suffix indicates the industrial temperature grade (-40°C to +85°C) and SO-8 package configuration. Confirm RoHS compliance status through official manufacturer documentation before integration. Ensure supply voltage constraints (minimum 2.5V single supply) align with target application requirements.
Selection Notes
Select this component when low quiescent current is critical alongside precise threshold detection. The integrated reference eliminates the need for external voltage references in many designs. Consider the open-drain output topology for level shifting or wire-OR configurations. Verify that the required hysteresis can be achieved within the specified 50mV limit between REF and HYST pins.
Part Context
This part belongs to the LTC1841/LTC1842/LTC1843 family of ultralow power comparators. While the LTC1841 lacks a reference and the LTC1842 has different input polarity, the LTC1843 provides dual comparators with a fixed reference and specific input configurations suitable for window detector applications.
Replacement Considerations
LTC1843CS8#PBF
FAQ
What is the maximum hysteresis voltage band achievable?
The maximum hysteresis voltage band is 100mV, determined by the maximum allowed voltage difference of 50mV between the REF and HYST pins.
Can the reference output drive large capacitive loads?
The reference can directly drive up to 0.01μF without oscillation. Larger capacitance values require a series damping resistor to prevent instability.
