Features
- 6.5μA supply current across the full temperature range
- Wide supply range: 2V to 11V
- Precision 1.182V ±0.5% voltage reference
- Comparator with user programmable hysteresis
- Temperature range: -40°C to +125°C
- 8 Ld MSOP and 8 Ld TDFN packages
- Pin compatible upgrade to MAX921 and LTC1440
ISL21440 Functional Diagram
Description
The ISL21440 is a micropower, FGA reference, and comparator on a single chip. Drawing less than 6. 5μA supply current across the full operating temperature range, the ISL21440 operates from a single 2V to 11V supply and can also be used with split bipolar supplies. The ISL21440’s on-board reference provides a 1. 182V ±0. 5% output. It features programmable hysteresis and TTL/CMOS compatible outputs that sink and source current. Low bias currents permit high value divider resistors for typical circuit current drains of 2. 5μA. The low supply current makes the ISL21440 ideal for battery powered devices in battery level or low voltage monitor circuits. The ISL21440 is a pin-compatible, performance upgrade of the LTC1440, LTC1540, MAX921, and MAX931.
Applications
- Low Battery Detector
- Low Voltage Reset
- Overvoltage Monitor
- Window Comparator
| Part Number | Status | Samples | Stock | RoHS | Package | Lead Count (#) | Carrier Type | Moisture Sensitivity Level (MSL) | Pitch (mm) | Pkg. Dimensions (mm) | Pb (Lead) Free | Pb Free Category | Temp. Range (°C) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ISL21440IRTZ | Obsolete | N/A | Out of Stock | RoHS:EN | TDFN | 8# | Tube | 1 | 0.5mm | 3.0 x 3.0 x 0.75 | Yes | Pb-Free 100% Matte Tin Plate w/Anneal-e3 | -40 to +125°C |
| ISL21440IRTZ-T13 | Obsolete | N/A | Out of Stock | RoHS:EN | TDFN | 8# | Reel | 1 | 0.5mm | 3.0 x 3.0 x 0.75 | Yes | Pb-Free 100% Matte Tin Plate w/Anneal-e3 | -40 to +125°C |
| ISL21440IUZ | Obsolete | N/A | In Stock | RoHS:EN | MSOP | 8# | Tube | 2 | 0.7mm | 3.0 x 3.0 x 0.00 | Yes | Pb-Free 100% Matte Tin Plate w/Anneal-e3 | -40 to +125°C |
| ISL21440IUZ-T13 | Obsolete | N/A | Out of Stock | RoHS:EN | MSOP | 8# | Reel | 2 | 0.7mm | 3.0 x 3.0 x 0.00 | Yes | Pb-Free 100% Matte Tin Plate w/Anneal-e3 | -40 to +125°C |
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- Product Change NoticePDF 383 KB PCN17014 Mar 27, 2017
- Product Change NoticePDF 414 KB PCN16032 Mar 17, 2016
- Product Change NoticePDF 98 KB PCN12094 Dec 19, 2012
- Product Change NoticePDF 135 KB PCN12084 Oct 15, 2012
- Product Change NoticePDF 79 KB PCN11020 Feb 22, 2011
- Application NotePDF 1.39 MB an177 Jun 13, 2005AI-generated Summary: Bandgap voltage references generate stable output voltages by combining two temperature-dependent voltages to cancel temperature drift, typically around 1.24V. They operate with low voltage (<5V), low current (<1mA), and moderate temperature drift (>20ppm/°C). Buried Zener references offer low noise and temperature drift but require higher voltage (>7V) and current (>1.5mA). Intersil Floating Gate Analog technology stores precise voltages on a floating gate, achieving very low temperature drift (1ppm/°C), high accuracy, and ultra-low current (<1µA). Key specs include absolute accuracy and temperature coefficient, with advanced methods to measure and reduce drift.
- Application NotePDF 503 KB an9675 Aug 13, 1999AI-generated Summary: Effective Number of Bits (ENOB) depends critically on precise coherence in A/D sampling, with small frequency shifts significantly impacting accuracy. Unwrapping reconstructs coherently sampled sine waves, while windowing controls spectral leakage by shaping the acquisition window. Resampling and interpolation adjust sample sets to avoid leakage in FFT analysis. Different window functions balance side lobe levels and bandwidth, affecting spectral resolution and leakage reduction.
- Application NotePDF 287 KB an9705 Feb 21, 1997AI-generated Summary: Coherent sampling requires the ratio of signal frequency to sampling frequency to be a rational number, expressed as ko/N. When this condition is not met, frequency smearing occurs across bins. Data Acquisition Systems (DAS) can mitigate this by windowing, fixing sampling frequency and tuning input frequency, or fixing input frequency and tuning sampling frequency. The latter two methods are practical for most systems. Pseudo-code illustrates the frequency response for non-integer ko values.
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- Application NotePDF 1.39 MB an177 Jun 13, 2005AI-generated Summary: Bandgap voltage references generate stable output voltages by combining two temperature-dependent voltages to cancel temperature drift, typically around 1.24V. They operate with low voltage (<5V), low current (<1mA), and moderate temperature drift (>20ppm/°C). Buried Zener references offer low noise and temperature drift but require higher voltage (>7V) and current (>1.5mA). Intersil Floating Gate Analog technology stores precise voltages on a floating gate, achieving very low temperature drift (1ppm/°C), high accuracy, and ultra-low current (<1µA). Key specs include absolute accuracy and temperature coefficient, with advanced methods to measure and reduce drift.
- Application NotePDF 503 KB an9675 Aug 13, 1999AI-generated Summary: Effective Number of Bits (ENOB) depends critically on precise coherence in A/D sampling, with small frequency shifts significantly impacting accuracy. Unwrapping reconstructs coherently sampled sine waves, while windowing controls spectral leakage by shaping the acquisition window. Resampling and interpolation adjust sample sets to avoid leakage in FFT analysis. Different window functions balance side lobe levels and bandwidth, affecting spectral resolution and leakage reduction.
- Application NotePDF 287 KB an9705 Feb 21, 1997AI-generated Summary: Coherent sampling requires the ratio of signal frequency to sampling frequency to be a rational number, expressed as ko/N. When this condition is not met, frequency smearing occurs across bins. Data Acquisition Systems (DAS) can mitigate this by windowing, fixing sampling frequency and tuning input frequency, or fixing input frequency and tuning sampling frequency. The latter two methods are practical for most systems. Pseudo-code illustrates the frequency response for non-integer ko values.
Application Notes & White Papers (3)
- Product Change NoticePDF 383 KB PCN17014 Mar 27, 2017
- Product Change NoticePDF 414 KB PCN16032 Mar 17, 2016
- Product Change NoticePDF 98 KB PCN12094 Dec 19, 2012View More (7)
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