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Analog Devices Inc. LT1720CMS8#PBF
- Part No.:
- LT1720CMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1720CMS8#PBF.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:304
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Product details
Overview
LT1720CMS8#PBF from Analog Devices (formerly Linear Technology) is a dual, ultrafast rail-to-rail output comparator optimized for single-supply 3V/5V operation. It delivers 4.5ns propagation delay at 20mV overdrive, 4mA per comparator supply current, and input common-mode range extending 100mV below ground to 1.2V below VCC - enabling direct interfacing with TTL/CMOS logic in high-speed threshold detection circuits.
For engineers reviewing the LT1720CMS8#PBF datasheet, LT1720CMS8#PBF pinout, LT1720CMS8#PBF application, or LT1720CMS8#PBF equivalent, key selection considerations include its guaranteed 4.5ns speed at 20mV overdrive, internal 3.5mV hysteresis, MSOP-8 package footprint, rail-to-rail output drive capability, and compatibility with low-voltage crystal oscillator buffer and window comparator topologies.
Technical Context
The LT1720CMS8#PBF implements a complementary bipolar input stage with internal hysteresis, enabling stable operation with slow-moving inputs without external feedback. Its differential propagation delay is ≤1.0ns between channels, and output rise/fall times are 2.5ns/2.2ns into 10pF, supporting clean signal edge integrity in sampling and timing-critical paths.
Designed for single-supply systems, it features independent comparator cores sharing only VCC and GND pins, with pinout optimized to minimize parasitic coupling - inverting inputs are placed opposite outputs and shielded by power rails to suppress oscillation in high-speed layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay (tPD20) | 4.5ns typical - enables sub-5ns decision latency in 100MHz+ sampling systems |
| Supply Voltage Range | 2.7V to 6V - supports direct integration into 3.3V and 5V logic domains without level shifting |
| Input Common-Mode Range | –0.1V to VCC – 1.2V - allows ground-referenced sensing and interface with negative-going signals |
| Output Drive | Rail-to-rail (VOH ≥ VCC – 0.4V, VOL ≤ 0.4V @ 4mA/10mA) - ensures full-swing TTL/CMOS compatibility |
| Internal Hysteresis | 3.5mV typical - eliminates chatter on noisy or slowly varying thresholds without external components |
| Quiescent Current | 4mA per comparator at 5V - balances speed and power for battery-sensitive portable instrumentation |
| Operating Temperature | 0°C to 70°C (C grade) - validated for commercial-grade industrial control and test equipment |
Pinout & Package
LT1720CMS8#PBF is housed in an 8-lead plastic MSOP package (3mm × 3mm, 0.85mm height), thermally rated to TJMAX = 150°C with θJA = 230°C/W. The MSOP footprint provides compact layout while maintaining hand-solderability and reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN A (Pin 1) | Noninverting input of Comparator A | Accepts reference or signal input; designed for minimal capacitive loading in high-Z threshold networks |
| –IN A (Pin 2) | Inverting input of Comparator A | High-sensitivity input placed opposite outputs to reduce crosstalk; requires controlled-impedance routing |
| –IN B (Pin 3) | Inverting input of Comparator B | Electrically isolated from Comparator A; shares no internal nodes beyond GND/VCC |
| +IN B (Pin 4) | Noninverting input of Comparator B | Enables dual independent comparisons - e.g., upper/lower bounds in window detection |
| GND (Pin 5) | Analog/digital ground reference | Single ground pin serves both comparators; must be low-inductance connection to system ground plane |
| OUT B (Pin 6) | Output of Comparator B | Rail-to-rail CMOS-compatible output; capable of driving 10pF loads with <2.5ns rise time |
| OUT A (Pin 7) | Output of Comparator A | Independent output with matched timing skew (<1.5ns) to OUT B for synchronized decisions |
| VCC (Pin 8) | Positive supply voltage | Accepts 2.7V–6V; requires local 10nF ceramic + 2.2μF tantalum bypassing within 5cm |
Key Features
| Feature | Design Value |
|---|---|
| UltraFast 4.5ns propagation delay | Enables real-time response in >200MHz clock domain monitoring and pulse-stretching applications |
| Internal 3.5mV hysteresis | Eliminates need for external positive feedback resistors in noise-prone industrial sensor interfaces |
| Rail-to-rail TTL/CMOS-compatible outputs | Directly drives FPGA I/O banks, microcontroller GPIO, and logic gates without level-shifter ICs |
| Input range extends 100mV below ground | Supports detection of signals crossing zero in single-supply data acquisition front-ends |
| Pinout optimized for high-speed layout | Inverting inputs shielded by VCC/GND rails reduce layout-induced oscillation risk in PCB designs |
Applications
| Crystal Oscillator Buffer | Window Comparator |
|---|---|
Use Scenario: Buffers and squares up low-power AT-cut crystal oscillator outputs (1MHz–10MHz) before distribution to clock domains. IC Role / Device Role / Timing Role: High-speed comparator acting as a zero-crossing detector with rail-to-rail output swing to regenerate clean CMOS clocks. Use Value: Maintains jitter <15psRMS at 20MHz while consuming only 8mA total, preserving oscillator phase integrity without active amplification. |
Use Scenario: Monitors analog sensor output (e.g., temperature, pressure) against upper and lower thresholds to trigger alarm states. IC Role / Device Role / Timing Role: Dual comparator implementing independent high/low trip points using shared reference divider network. Use Value: Internal hysteresis prevents false triggering near thresholds; 4.5ns response enables fast fault isolation in motor control safety circuits. |
| Zero-Crossing Detector | Pulse Stretcher |
Use Scenario: Detects AC line voltage zero crossings in smart energy meters and TRIAC dimmer controllers. IC Role / Device Role / Timing Role: Comparator configured with resistive attenuator and bias to detect ±10mV transitions around 0V in single-supply systems. Use Value: Input common-mode range down to –0.1V allows direct ground-referenced sensing; rail-to-rail output ensures reliable MCU interrupt assertion. |
Use Scenario: Extends narrow pulses (e.g., from photodiode detectors or encoder edges) to meet minimum width requirements of downstream logic. IC Role / Device Role / Timing Role: One comparator triggers monostable timing via RC network; second comparator resets latch after defined delay. Use Value: Sub-5ns propagation delay minimizes timing uncertainty; low 4mA quiescent current reduces power overhead in always-on sensor nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual high-speed comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH7322MA/NOPB | 4.5ns delay at 100mV overdrive (not 20mV); higher 9mA supply current; no internal hysteresis | Requires external hysteresis resistors; better suited for precision DC-coupled comparisons than fast AC-triggered events | Select when absolute offset matching <1mV is required and board space permits external feedback components |
| ADCMP600BRMZ-REEL | 2.8ns delay but limited 2.7V–5.5V supply range; 12mA supply current; rail-to-rail output not guaranteed below 3V | Superior speed for RF sampling, but less robust in 3.3V industrial I/O where rail-to-rail swing is critical | Select when sub-3ns latency is mandatory and system operates strictly at 5V with heavy capacitive loads |
Compared with LMH7322MA/NOPB and ADCMP600BRMZ-REEL, LT1720CMS8#PBF uniquely combines guaranteed 4.5ns performance at low 20mV overdrive, built-in hysteresis, and full rail-to-rail output drive across 2.7V–6V - making it optimal for cost-sensitive, space-constrained 3V/5V threshold detection where reliability under noise and supply variation is essential.
Availability
LT1720CMS8#PBF is available at Aetrix Electronics and suitable for crystal oscillator buffering, window comparator circuits, zero-crossing detection, and pulse stretching applications requiring stable component supply across industrial and test equipment lifecycles.
Supply support for LT1720CMS8#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) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving precision instrumentation, communications, and industrial markets.
The LT1720 series belongs to Linear's UltraFast comparator product line, engineered specifically for single-supply, low-voltage, high-speed decision-making in timing-critical systems - emphasizing speed/power trade-off optimization and layout-friendly pinouts.
FAQ
What is the maximum toggle frequency supported by the LT1720CMS8#PBF?
The LT1720CMS8#PBF supports a maximum toggle frequency of 70.0MHz at 3V supply and 62.5MHz at 5V supply when driven with 50mV overdrive. This is derived from its 4.5ns propagation delay and internal architecture - verified in the Electrical Characteristics table under fMAX parameter with specified test conditions.
Does the LT1720CMS8#PBF require external hysteresis for stable operation?
No, the LT1720CMS8#PBF includes internal hysteresis of 3.5mV typical (2.0mV min, 7.0mV max), explicitly designed to prevent oscillation with slow-moving or noisy inputs. This eliminates the need for external positive feedback resistors in most threshold-detection applications, as confirmed in the FEATURES and ELECTRICAL CHARACTERISTICS sections.
Can the LT1720CMS8#PBF operate from a 2.7V supply while maintaining rail-to-rail output swing?
Yes, the LT1720CMS8#PBF is fully specified from 2.7V to 6V. At 2.7V supply, its rail-to-rail outputs deliver VOH ≥ 2.3V and VOL ≤ 0.4V under load, meeting TTL/CMOS logic thresholds. This is validated in the ELECTRICAL CHARACTERISTICS table (VOH/VOL rows) and Absolute Maximum Ratings section.
What is the thermal resistance (θJA) of the LT1720CMS8#PBF in its MSOP-8 package?
The LT1720CMS8#PBF in the MSOP-8 package has a junction-to-ambient thermal resistance (θJA) of 230°C/W, as stated in the PIN CONFIGURATION diagram for the MS8 PACKAGE. This value assumes standard JEDEC 2-layer board conditions and guides heatsinking requirements for continuous 8mA operation at elevated ambient temperatures.
How does the LT1720CMS8#PBF handle input voltages below the negative rail?
The LT1720CMS8#PBF allows input voltages down to –0.1V (100mV below ground) with valid operation. If both inputs fall below this limit (e.g., to –400mV), phase reversal protection holds output polarity but increases offset/hysteresis to ~15mV. This behavior is documented in the "Input Voltage Considerations" section on page 8 of the datasheet.
LT1720CMS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- UltraFast™
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- CMOS, Rail-to-Rail, TTL
- Voltage - Supply, Single/Dual (±):
- 2.7V ~ 6V
- :
- 3mV @ 5V
- Voltage - Input Offset (Max):
- 6µA @ 5V
- Current - Input Bias (Max):
- 20mA
- Current - Output (Typ):
- 7mA
- Current - Quiescent (Max):
- 70dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 10ns
- Propagation Delay (Max):
- 7mV
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-MSOP
LT1720CMS8#PBF FAQ
1.How can I place an order for LT1720CMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1720CMS8#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 LT1720CMS8#PBF reliable?
The price and inventory of LT1720CMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1720CMS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1720CMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1720CMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1720CMS8#PBF?
LT1720CMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1720CMS8#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 LT1720CMS8#PBF?
For technical support, including LT1720CMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1720CMS8#PBF requirements.
6.How does Aetrix verify that LT1720CMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1720CMS8#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 LT1720CMS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1720CMS8#PBF?
All LT1720CMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1720CMS8#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 LT1720CMS8#PBF part is unused and in its original packaging.
Return procedure for LT1720CMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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