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Analog Devices Inc. LTC1444CN#PBF
- Part No.:
- LTC1444CN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1444CN#PBF.pdf
- Description:
- IC COMPARATOR 4 W/VOLT REF 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,953
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Product details
Overview
LTC1444CN#PBF from Analog Devices (formerly Linear Technology) is an ultralow power quad comparator IC with integrated 1.221V ±1% voltage reference and open-drain outputs referenced to V–. It draws ≤8.5µA supply current over temperature, supports single-supply operation from 2V to 11V, features programmable hysteresis via the HYST pin, and operates with input common-mode range from V– to V+ – 1.3V. It is used in battery-powered threshold detection circuits where low quiescent current and stable internal reference are critical.
For engineers reviewing the LTC1444CN#PBF datasheet, LTC1444CN#PBF pinout, LTC1444CN#PBF application, or LTC1444CN#PBF equivalent, key selection criteria include its 1.221V reference accuracy, open-drain output architecture tied to V–, HYST-pin-based hysteresis programming, 12µs typical propagation delay at 10mV overdrive, and compatibility with PDIP-16 packaging for through-hole prototyping and industrial control modules.
Technical Context
The LTC1444CN#PBF implements four independent comparators sharing a precision bandgap reference (1.221V ±1% over –40°C to +85°C), with each comparator's inputs operating rail-to-rail down to V– and up to V+ – 1.3V. Its open-drain outputs sink current to V– and require external pull-up for logic-high assertion - unlike the TTL/CMOS-sourcing outputs of LTC1443/LTC1445.
Hysteresis is implemented externally via two resistors between REF and HYST pins, enabling adjustable threshold bands up to 100mV (±50mV around REF); the HYST pin accepts voltages from REF – 50mV to REF. The reference can drive up to 0.01µF bypass capacitance without oscillation and delivers up to 200µA source / 15µA sink current while maintaining microamp-level quiescent draw.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | ≤8.5µA max over full temperature range - enables multi-year operation on coin-cell batteries in remote sensors. |
| Reference Voltage | 1.221V ±1% (C-temp), ±1.5% (I-temp) - provides stable trip point without external reference IC or resistor divider calibration. |
| Propagation Delay | 12µs typical at 10mV overdrive (COUT = 100pF) - balances speed and ultralow power for slow-varying signals like battery voltage monitoring. |
| Input Common-Mode Range | V– to V+ – 1.3V - allows direct sensing of signals near ground in single-supply systems without level-shifting circuitry. |
| Output Type | Open-drain to V– - supports wired-OR logic, mixed-voltage interfacing, and flexible pull-up configuration (e.g., to higher rail or optocoupler). |
| Hysteresis Control | Programmable via HYST pin (REF – 50mV to REF) - eliminates false triggering from noise without adding external components beyond two resistors. |
| Supply Voltage Range | Single: 2V to 11V; Dual: ±1V to ±5.5V - accommodates wide input sources including depleted alkaline, Li-ion, and industrial 5V/9V rails. |
Pinout & Package
Package: 16-lead plastic DIP (PDIP), 0.300-inch width, through-hole mount. Pin 14 functions as HYST (hysteresis control input), not GND - distinguishing it from LTC1443.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 15, 16 | Comparator Outputs (OUT B, OUT A, OUT D, OUT C) | Open-drain outputs sinking to V–; require external pull-up for logic-high; support wired-OR and level translation. |
| 3 | V+ | Positive supply rail; accepts 2V–11V single supply or +1V–+5.5V in dual-supply mode. |
| 4, 5, 6, 7, 10, 11, 12, 13 | IN A–/A+/B–/B+/C–/C+/D–/D+ | Differential input pairs for four comparators; inputs tolerate 300mV beyond rails without damage; leakage <1nA. |
| 8 | REF | 1.221V reference output; drives 0.01µF bypass cap stably; sources up to 200µA, sinks 15µA. |
| 9 | V– | Negative supply; connect to GND for single-supply use; internally ties to exposed pad in DFN variants. |
| 14 | HYST | Hysteresis control input; voltage set between REF – 50mV and REF to define threshold band; connect to REF if unused. |
Key Features
| Feature | Design Value |
|---|---|
| No crowbar current during output transitions | Eliminates supply rail glitches that could falsely trigger other comparators or digital logic in shared power domains. |
| Reference drives 0.01µF capacitor without oscillation | Enables robust local decoupling at the reference node, reducing sensitivity to PCB layout parasitics and supply noise. |
| Programmable hysteresis using two external resistors | Allows precise noise immunity tuning (up to ±50mV around REF) without modifying comparator core or adding op-amps. |
| Input voltage range includes negative supply rail | Supports direct sensing of 0V-referenced signals (e.g., battery cathode monitoring) without biasing networks. |
| Ultralow 8.5µA max supply current over temperature | Extends operational lifetime in energy-harvesting and battery-backed applications such as smoke detectors and IoT endpoints. |
Applications
| Battery Voltage Monitoring | Multi-Rail Power Sequencing |
|---|---|
|
Use Scenario: Detecting low-voltage cutoff thresholds across multiple battery chemistries (Li-ion, alkaline, NiMH) in portable medical devices. IC Role / Device Role / Timing Role: Quad comparator compares battery voltage against 1.221V reference scaled by precision resistor dividers; HYST pin configures hysteresis to prevent chatter during gradual discharge. Use Value: Eliminates need for external reference IC and discrete hysteresis circuitry, reducing BOM count by ≥3 components per channel while maintaining ±1% trip accuracy over temperature. |
Use Scenario: Ensuring correct power-up order for FPGA, memory, and analog subsystems in industrial controllers. IC Role / Device Role / Timing Role: Each comparator monitors individual supply rails (e.g., 3.3V, 2.5V, 1.8V, 1.2V); open-drain outputs feed into AND-gate logic to gate enable signals only after all rails stabilize. Use Value: Open-drain outputs allow direct connection to diverse logic families (3.3V, 5V, 1.8V) without level shifters; internal reference removes dependency on unstable LDO feedback nodes. |
| Glitch-Immune Level Detection | Window Comparator for Sensor Thresholding |
|
Use Scenario: Detecting valid signal presence in noisy industrial sensor interfaces (e.g., thermocouple cold-junction compensation outputs). IC Role / Device Role / Timing Role: One comparator monitors signal vs reference; HYST pin adds hysteresis to reject EMI-induced transients; REF output bypassed with 0.01µF capacitor suppresses supply-coupled glitches. Use Value: Reference stability and hysteresis programmability reduce false alarms by >95% compared to discrete comparator + Zener solutions under 100mVpp conducted noise. |
Use Scenario: Validating analog sensor outputs (e.g., pressure transducer) remain within safe operating bounds before data acquisition. IC Role / Device Role / Timing Role: Two comparators form upper/lower thresholds using same REF; third comparator combines outputs via external diodes to generate window-in-range flag; fourth unused or reserved. Use Value: Single-package integration of reference + four comparators enables compact 4-channel window detection with matched reference drift (<10ppm/°C), avoiding inter-device offset mismatches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad micropower comparator with reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1445CS#PBF | TTL/CMOS push-pull outputs (source/sink), 1.221V reference, same hysteresis capability, SO-16 package | Requires no external pull-up; better for driving capacitive loads directly but less flexible for mixed-voltage bus interfacing | Select when sourcing >1mA output current is required without external components, and board space permits SOIC footprint. |
| LTC1440CS#PBF | Single comparator, 1.128V ±1% reference, 5.7µA supply current, SO-8 package | Lower channel count and quiescent current; lacks hysteresis pin - uses fixed internal hysteresis (~5mV) | Select for ultra-low-power single-threshold detection where board area is constrained and hysteresis requirements are minimal. |
Compared with LTC1445CS#PBF, LTC1444CN#PBF offers superior noise immunity via programmable hysteresis and mixed-voltage interface flexibility, while LTC1440CS#PBF trades channel count and hysteresis control for lower ICC and smaller footprint - making LTC1444CN#PBF optimal for multi-threshold, noise-prone, through-hole designs.
Availability
LTC1444CN#PBF is available at Aetrix Electronics and suitable for battery-powered system monitoring, threshold detectors, and industrial power sequencing requiring stable component supply with long-term manufacturability and RoHS-compliant lead-free finish.
Supply support for LTC1444CN#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains full product support, datasheet archives, and application engineering resources for legacy Linear parts including the LTC1444 series.
The LTC1444 belongs to Linear's ultralow power comparator family designed specifically for energy-constrained applications such as portable instrumentation, remote sensors, and always-on supervisory circuits where nanoscale leakage and reference stability are design-critical.
FAQ
What is the reference voltage tolerance of the LTC1444CN#PBF over temperature?
The LTC1444CN#PBF features a 1.221V internal reference with ±1% initial accuracy at 25°C and ±1.5% total variation over the commercial temperature range (0°C to 70°C). This is confirmed in the Electrical Characteristics table under "VREF No Load, LTC1444/LTC1445" with min/max values of 1.209V to 1.233V at C-temp and 1.203V to 1.239V at I-temp. The LTC1444CN#PBF reference remains stable enough to eliminate external trimming in most battery-monitoring applications.
Can the LTC1444CN#PBF operate from a single 3.3V supply?
Yes, the LTC1444CN#PBF supports single-supply operation from 2V to 11V, including 3.3V. At V+ = 3.3V and V– = GND, the input common-mode range extends from 0V to 2.0V (V+ – 1.3V), and the open-drain outputs sink cleanly to GND. Supply current remains ≤8.5µA, and propagation delay is 12µs typical at 10mV overdrive - making the LTC1444CN#PBF ideal for 3.3V IoT endpoint supervision.
How is hysteresis configured on the LTC1444CN#PBF?
Hysteresis on the LTC1444CN#PBF is configured by connecting two external resistors: R1 between REF and HYST, and R2 between HYST and V–. The hysteresis voltage band (VHB) equals twice the voltage difference between REF and HYST, with maximum VHB = 100mV (±50mV). If hysteresis is not needed, short HYST to REF. This configuration is validated in Figure 4 and Applications Information section of the LTC1444CN#PBF datasheet.
What is the maximum capacitive load the REF pin of the LTC1444CN#PBF can drive without oscillation?
The REF pin of the LTC1444CN#PBF can drive up to 0.01µF (10nF) bypass capacitance without oscillation, as explicitly stated in the Features list and Applications Information section. For larger capacitors (up to 100µF), a series damping resistor (e.g., 430Ω for 1µF, per Figure 2) must be added between REF and the capacitor to maintain stability - a design detail confirmed in the LTC1444CN#PBF reference settling test circuit (Figure 1).
Is the LTC1444CN#PBF pin-compatible with the MAX924 comparator?
No - the LTC1444CN#PBF is not pin-compatible with the MAX924. While the LTC1443 is noted as a pin-compatible upgrade for MAX924, the LTC1444CN#PBF differs critically at Pin 14 (HYST vs GND) and output structure (open-drain vs push-pull). Swapping them would cause incorrect biasing and undefined output behavior. Always verify pin functions per device-specific pin configuration diagrams - the LTC1444CN#PBF requires redesign of hysteresis and pull-up networks relative to MAX924 layouts.
LTC1444CN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- with Voltage Reference
- Number of Elements:
- 4
- Output Type:
- CMOS, Open-Drain, TTL
- Voltage - Supply, Single/Dual (±):
- 2V ~ 11V, ±1V ~ 5.5V
- :
- 10mV @ 5V
- Voltage - Input Offset (Max):
- -
- Current - Input Bias (Max):
- 0.015mA @ 5V
- Current - Output (Typ):
- 8.5µA
- Current - Quiescent (Max):
- 80dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 12µs
- Propagation Delay (Max):
- 50mV
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Through Hole
- :
- 16-PDIP
LTC1444CN#PBF FAQ
1.How can I place an order for LTC1444CN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1444CN#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC1444CN#PBF reliable?
The price and inventory of LTC1444CN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1444CN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1444CN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1444CN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1444CN#PBF?
LTC1444CN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1444CN#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC1444CN#PBF?
For technical support, including LTC1444CN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1444CN#PBF requirements.
6.How does Aetrix verify that LTC1444CN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1444CN#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC1444CN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1444CN#PBF?
All LTC1444CN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1444CN#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC1444CN#PBF part is unused and in its original packaging.
Return procedure for LTC1444CN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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