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Analog Devices Inc. LT1720CS8#PBF
- Part No.:
- LT1720CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1720CS8#PBF.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,122
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Product details
Overview
LT1720CS8#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 interface with TTL/CMOS logic in high-speed threshold detection systems.
For engineers reviewing the LT1720CS8#PBF datasheet, LT1720CS8#PBF pinout, LT1720CS8#PBF application, or LT1720CS8#PBF equivalent, this page provides verified functional identity, SO-8 package mapping, dual-comparator timing behavior, rail-to-rail output drive capability, and validated alternative options for high-speed comparator selection.
Technical Context
The LT1720CS8#PBF implements a complementary bipolar differential input stage with internal 3.5mV typical hysteresis, enabling stable operation with slow-moving signals without external feedback. Its rail-to-rail CMOS-compatible outputs swing within 400mV of VCC and GND under 10mA load, supporting direct connection to 3V/5V logic families.
Pinout is optimized for high-speed layout: inverting inputs (–INA, –INB) are placed opposite outputs (OUTA, OUTB) and shielded by VCC and GND rails to minimize parasitic coupling. The device operates across 2.7V–6V supply range with guaranteed performance from 0°C to 70°C (C-grade).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 4.5ns at 20mV overdrive - enables sub-5ns decision timing in pulse discrimination and zero-crossing detection. |
| Supply Voltage Range | 2.7V to 6V - supports direct integration into 3V and 5V digital systems without level-shifting circuitry. |
| Input Common-Mode Range | –0.1V to VCC – 1.2V - allows detection of signals below ground (e.g., AC-coupled sensor outputs) with single supply. |
| Output Drive | Rail-to-rail, VOH ≥ VCC – 0.4V @ 4mA, VOL ≤ 0.4V @ 10mA - ensures TTL/CMOS logic compatibility and robust noise margin. |
| Supply Current | 4mA per comparator at 5V - balances speed and power efficiency for battery-sensitive or thermally constrained designs. |
| Input Hysteresis | 2.0mV to 7.0mV (typ 3.5mV) - eliminates chatter on noisy or slowly varying inputs without external components. |
| Operating Temperature | 0°C to 70°C - qualified for commercial industrial control, test equipment, and communications infrastructure applications. |
Pinout & Package
LT1720CS8#PBF is housed in an 8-lead plastic SO (Small Outline) package, 3.9mm × 4.9mm footprint, 1.75mm height, with gull-wing leads and JEDEC MS-012AC outline. Pin 1 is marked with a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN A (Pin 1) | Noninverting input of Comparator A | Accepts reference or signal input; common-mode range extends to –0.1V for ground-referenced thresholds. |
| –IN A (Pin 2) | Inverting input of Comparator A | High-speed sensitive node; positioned away from outputs to reduce capacitive coupling in PCB layout. |
| –IN B (Pin 3) | Inverting input of Comparator B | Electrically isolated from Comparator A; enables independent dual-threshold monitoring. |
| +IN B (Pin 4) | Noninverting input of Comparator B | Supports differential or single-ended configurations; same voltage range and bias characteristics as +IN A. |
| GND (Pin 5) | Ground reference | Common return for both comparators; must be low-impedance to maintain timing accuracy and noise immunity. |
| OUT B (Pin 6) | Output of Comparator B | Rail-to-rail CMOS/TTL-compatible output; drives 10mA sink / 4mA source with <2.5ns rise/fall times. |
| OUT A (Pin 7) | Output of Comparator A | Independent output with matched propagation delay (<1ns skew vs 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 for stable high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrafast 4.5ns propagation delay | Enables real-time pulse stretching, sampling, and crystal oscillator monitoring up to 70MHz toggle frequency. |
| Internal 3.5mV hysteresis | Eliminates need for external positive feedback resistors in threshold detectors and window comparators. |
| Rail-to-rail output swing | Guarantees full logic-level compatibility with 3V/5V CMOS and TTL without pull-up resistors or level translators. |
| Optimized SO-8 pinout | Shields sensitive inverting inputs between VCC and GND rails to suppress crosstalk in high-density layouts. |
| Low dynamic current drain | 15μA/(V·MHz) loading - minimizes supply noise generation during high-frequency switching events. |
Applications
| Crystal Oscillator Monitoring | High-Speed Line Receiver |
|---|---|
|
Use Scenario: Detecting valid oscillation and amplitude loss in 1MHz–10MHz AT-cut crystal circuits with TTL/CMOS output stages. IC Role / Device Role / Timing Role: Dual comparator configured as amplitude discriminator and zero-crossing detector to validate start-up and sustain conditions. Use Value: 4.5ns delay and rail-to-rail output ensure accurate edge timing capture without added gate delay or level translation. |
Use Scenario: Receiving differential or single-ended high-speed data lines (e.g., LVDS-derived signals converted to single-ended) in test instrumentation. IC Role / Device Role / Timing Role: High-speed differential line receiver with programmable threshold via resistor divider on +IN pins. Use Value: Input common-mode range down to –0.1V supports reception of signals referenced below ground, common in legacy bus interfaces. |
| Window Comparator | Pulse Stretcher / Edge Detector |
|
Use Scenario: Validating analog sensor outputs (e.g., temperature, pressure) remain within safe operational bounds before triggering alarms. IC Role / Device Role / Timing Role: Dual comparator implementing upper and lower trip points using shared reference and internal hysteresis. Use Value: Matched propagation delays (<1ns skew) and identical hysteresis ensure symmetrical window response with no timing-induced false triggers. |
Use Scenario: Converting narrow pulses from photodiodes or RF detectors into standardized logic-width outputs for FPGA capture. IC Role / Device Role / Timing Role: One comparator detects rising edge, second detects falling edge; XOR of outputs generates stretched pulse. Use Value: Sub-5ns delay and <2.5ns rise/fall times preserve pulse fidelity and enable >100MHz input event rates. |
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 |
|---|---|---|---|
| MAX961ASA+ | 4.8ns delay, 5.5V max supply, 3.5mA per comparator, SO-8 package | Lacks guaranteed operation below 2.7V; no specified hysteresis - external feedback required for noise immunity | Preferred when operating above 3V and external hysteresis design is acceptable |
| ADCMP600BRMZ | 2.8ns delay, 5.5V max supply, 6.5mA per comparator, 8-lead MSOP package | Higher speed but higher power; MSOP footprint differs from SO-8 - requires PCB redesign | Selected when sub-3ns timing is critical and layout revision is feasible |
Compared with MAX961ASA+ and ADCMP600BRMZ, the LT1720CS8#PBF offers the best balance of ultrafast timing (4.5ns), low-voltage operation (2.7V), integrated hysteresis, and SO-8 compatibility - making it optimal for cost-sensitive, space-constrained 3V/5V systems requiring drop-in reliability without layout changes.
Availability
LT1720CS8#PBF is available at Aetrix Electronics and suitable for crystal oscillator monitoring, high-speed line receivers, window comparators, and pulse stretchers requiring stable component supply across commercial temperature ranges.
Supply support for LT1720CS8#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, documentation, and manufacturing continuity for the LT® series precision analog ICs.
The LT1720CS8#PBF belongs to Linear's UltraFast™ comparator family, designed specifically for high-speed, single-supply threshold detection in test equipment, communications, and industrial control where timing accuracy and rail-to-rail interfacing are essential.
FAQ
What is the maximum toggle frequency supported by the LT1720CS8#PBF?
The LT1720CS8#PBF supports a maximum toggle frequency of 70.0MHz at 3V supply and 62.5MHz at 5V supply when driven with 50mV overdrive. This specification reflects the device's ability to reliably switch states at high repetition rates while maintaining propagation delay integrity and output drive strength - critical for clock monitoring and high-speed data acquisition applications using the LT1720CS8#PBF.
Does the LT1720CS8#PBF require external hysteresis for stable operation?
No, the LT1720CS8#PBF includes internal hysteresis of 2.0mV to 7.0mV (typical 3.5mV), eliminating the need for external positive feedback resistors in most threshold detection applications. This built-in hysteresis prevents output oscillation with slow-moving or noisy inputs - a key differentiator confirmed in the LT1720CS8#PBF datasheet and validated across its 0°C to 70°C operating range.
Can the LT1720CS8#PBF operate from a 2.7V supply?
Yes, the LT1720CS8#PBF is fully specified to operate from 2.7V to 6V, with all key parameters - including 4.5ns propagation delay, rail-to-rail output swing, and input common-mode range - guaranteed across this range. At 2.7V, it draws 3.5mA per comparator and maintains 70MHz toggle capability, making the LT1720CS8#PBF suitable for low-voltage portable and battery-powered systems.
What is the input common-mode voltage range of the LT1720CS8#PBF?
The LT1720CS8#PBF features an input common-mode voltage range from –0.1V (100mV below ground) to VCC – 1.2V, enabling detection of signals that go slightly negative relative to GND - such as AC-coupled sensor outputs or crystal oscillator waveforms. This specification is guaranteed over temperature and supply voltage, and is a defining feature of the LT1720CS8#PBF's single-supply usability.
Is the LT1720CS8#PBF pin-compatible with other packages in the LT1720 family?
Yes, the LT1720CS8#PBF shares identical pinout and electrical functionality with the LT1720CMS8#PBF (MSOP-8) and LT1720CDD#PBF (DFN-8), differing only in package type and thermal characteristics. All three variants use the same SO-8 pin assignment: Pin 1 (+INA), Pin 2 (–INA), Pin 3 (–INB), Pin 4 (+INB), Pin 5 (GND), Pin 6 (OUTB), Pin 7 (OUTA), Pin 8 (VCC) - ensuring direct substitution in existing LT1720CS8#PBF designs.
LT1720CS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SO
LT1720CS8#PBF FAQ
1.How can I place an order for LT1720CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1720CS8#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 LT1720CS8#PBF reliable?
The price and inventory of LT1720CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1720CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1720CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1720CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1720CS8#PBF?
LT1720CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1720CS8#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 LT1720CS8#PBF?
For technical support, including LT1720CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1720CS8#PBF requirements.
6.How does Aetrix verify that LT1720CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1720CS8#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 LT1720CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1720CS8#PBF?
All LT1720CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1720CS8#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 LT1720CS8#PBF part is unused and in its original packaging.
Return procedure for LT1720CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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