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Analog Devices Inc. LT1720CS8#TRPBF
- Part No.:
- LT1720CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1720CS8#TRPBF.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,624
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Product details
Overview
LT1720CS8#TRPBF from Analog Devices (formerly Linear Technology) is a dual ultrafast comparator optimized for single-supply 3V/5V operation, delivering 4.5ns propagation delay at 20mV overdrive, rail-to-rail TTL/CMOS-compatible outputs, and internal 3.5mV hysteresis. It operates from 2.7V to 6V, supports input voltages down to 100mV below ground, and is used in high-speed sampling circuits, crystal oscillator interfaces, and threshold detection where timing precision and low power (4mA per comparator) are critical.
For engineers reviewing the LT1720CS8#TRPBF datasheet, LT1720CS8#TRPBF pinout, LT1720CS8#TRPBF application, or LT1720CS8#TRPBF equivalent, this page provides verified technical context, package-validated pin functions, real-world application mappings, and two confirmed alternative comparators with documented functional trade-offs for design-in decisions.
Technical Context
The LT1720CS8#TRPBF implements a complementary bipolar differential input stage with integrated hysteresis, enabling stable operation with slow-moving inputs without external feedback. Its rail-to-rail output stage uses PNP/NPN push-pull drivers capable of sourcing 4mA and sinking 10mA while maintaining VOH ≥ VCC – 0.4V and VOL ≤ 0.4V under load.
Pin layout follows high-speed optimization: inverting inputs (–INA, –INB) are placed opposite outputs (OUTA, OUTB) and shielded by VCC and GND rails to minimize parasitic coupling. The SO-8 package supports layout practices that suppress oscillation-critical given its 2V/ns slew rate and sensitivity to <0.02pF output-to-input coupling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 4.5ns typical at 20mV overdrive - enables sub-5ns decision timing in clock recovery or pulse stretching. |
| Supply Voltage Range | 2.7V to 6V - supports direct interface with 3.3V and 5V logic domains without level shifting. |
| Input Common Mode Range | –0.1V to VCC – 1.2V - allows detection of signals below ground (e.g., AC-coupled sensors) and up to 3.8V on 5V supply. |
| Output Type | Rail-to-rail CMOS/TTL compatible - drives 10pF loads directly with 2.5ns rise/fall times, eliminating buffer stages. |
| Quiescent Current | 4mA per comparator at 5V - balances speed and power for battery-sensitive or thermally constrained systems. |
| Internal Hysteresis | 3.5mV typical - prevents chatter on noisy or slowly varying thresholds without external components. |
| Input Offset Voltage | 3.0mV max over temperature - ensures consistent trip-point accuracy in window or zero-crossing detectors. |
Pinout & Package
LT1720CS8#TRPBF is housed in an 8-lead plastic SO (Small Outline) package, 3.9mm × 4.9mm body size, with standard 1.27mm lead pitch and gull-wing leads. Thermal resistance θJA = 200°C/W supports operation up to +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+INA) | Noninverting input of Comparator A | Accepts reference or signal input; designed for minimal capacitive loading and noise pickup. |
| 2 (–INA) | Inverting input of Comparator A | High-impedance node; positioned away from outputs to reduce crosstalk-induced false triggering. |
| 3 (–INB) | Inverting input of Comparator B | Electrically isolated from Comparator A; shares no internal bias paths. |
| 4 (+INB) | Noninverting input of Comparator B | Independent threshold node; supports dual-channel window or differential sensing. |
| 5 (GND) | Analog and digital ground reference | Single ground pin serves both comparators; requires low-inductance PCB connection to minimize bounce. |
| 6 (OUTB) | Output of Comparator B | Rail-to-rail CMOS/TTL output; capable of driving 10pF loads with <3ns edge times. |
| 7 (OUTA) | Output of Comparator A | Independent output; differential skew <1.0ns ensures matched timing between channels. |
| 8 (VCC) | Positive supply voltage | Accepts 2.7V–6V; requires local 10nF ceramic + 2.2μF tantalum bypass within 5cm. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrafast propagation delay | 4.5ns at 20mV overdrive - enables >200MHz sampling in high-speed data acquisition front-ends. |
| Single-supply rail-to-rail outputs | VOH ≥ VCC – 0.4V, VOL ≤ 0.4V - eliminates level translators when interfacing with FPGA I/O banks or microcontroller GPIOs. |
| Input range extending below ground | –0.1V minimum common mode - supports direct connection to AC-coupled transducers or op-amp outputs biased near 0V. |
| Integrated hysteresis | 3.5mV typical, specified limits - removes need for external positive feedback resistors in threshold detection applications. |
| Optimized high-speed pinout | Inverting inputs shielded by VCC/GND rails - reduces layout-induced oscillation risk in >100MHz signal paths. |
Applications
| Crystal Oscillator Interface | High-Speed Sampling Circuit |
|---|---|
|
Use Scenario: Driving TTL/CMOS logic from a 1MHz–10MHz AT-cut crystal oscillator with minimal phase jitter. IC Role / Device Role / Timing Role: Comparator acts as a high-gain, low-jitter amplifier converting crystal's sine wave into clean square-wave clock. Use Value: 15psRMS timing jitter at 20MHz and 4.5ns propagation delay ensure sub-ns edge placement stability for synchronous sampling. |
Use Scenario: Capturing fast transient events (e.g., laser pulses, RF envelope detection) with precise trigger timing. IC Role / Device Role / Timing Role: Dual comparator forms leading/trailing edge detector or window comparator for pulse width discrimination. Use Value: Differential propagation delay <1.0ns and <3ns rise/fall times enable accurate pulse width measurement down to ~5ns resolution. |
| Threshold Detector/Discriminator | Zero-Crossing Detector |
|
Use Scenario: Detecting voltage excursions beyond programmable upper/lower limits in industrial sensor monitoring. IC Role / Device Role / Timing Role: Each comparator independently monitors one threshold; internal hysteresis rejects noise near trip points. Use Value: Guaranteed 2.0mV min hysteresis and 3.0mV max offset voltage ensure repeatable switching across temperature and supply variation. |
Use Scenario: Converting AC line voltage or audio signals to synchronized digital timing edges for phase control or demodulation. IC Role / Device Role / Timing Role: Comparator compares input against 0V reference (tied to GND via resistor divider), detecting polarity reversals. Use Value: Input common mode range extends to –0.1V, allowing reliable detection even with small negative excursions before full rail return. |
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 propagation delay, 5.5mA supply current, 2.5V–5.5V supply range, no internal hysteresis. | Requires external hysteresis network for noise immunity; better suited for precision DC thresholding than dynamic signal slicing. | Select when lower input bias current (±1pA) or wider supply range is prioritized over integrated hysteresis and lowest delay. |
| ADCMP600BRMZ | 2.5ns propagation delay, 12mA supply current, 2.5V–5.5V supply, rail-to-rail outputs, no internal hysteresis. | Higher speed but higher power; lacks built-in hysteresis, demanding careful PCB layout and external feedback for stability. | Select when sub-3ns timing is mandatory and system-level hysteresis can be implemented externally with controlled impedance routing. |
Compared with LT1720CS8#TRPBF, MAX961ASA+ trades 0.3ns delay for picoampere input bias and eliminates internal hysteresis, while ADCMP600BRMZ delivers 2ns faster response at triple the quiescent current and no hysteresis-making LT1720CS8#TRPBF optimal for balanced speed, power, and ease-of-use in cost-sensitive industrial timing designs.
Availability
LT1720CS8#TRPBF is available at Aetrix Electronics and suitable for crystal oscillator circuits, high-speed sampling circuits, and threshold discriminators requiring stable component supply, RoHS-compliant packaging, and guaranteed C-grade (0°C to 70°C) performance.
Supply support for LT1720CS8#TRPBF 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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and industrial markets.
The LT1720 family was designed specifically for high-speed, single-supply comparator applications where propagation delay, input range below ground, and integrated hysteresis are essential-targeting crystal oscillator buffering, pulse shaping, and real-time signal conditioning.
FAQ
What is the maximum operating temperature range for the LT1720CS8#TRPBF?
The LT1720CS8#TRPBF is rated for the C grade: 0°C to +70°C ambient operating temperature. Its SO-8 package has a thermal resistance θJA of 200°C/W, and junction temperature must not exceed 150°C. For extended temperature operation, the LT1720IS8#TRPBF (–40°C to +85°C) is the qualified alternative part number.
Does the LT1720CS8#TRPBF require external hysteresis for stable operation?
No-the LT1720CS8#TRPBF includes internal hysteresis of 3.5mV typical (2.0mV min, 7.0mV max), which prevents oscillation with slow-moving or noisy inputs. This eliminates the need for external positive feedback resistors in most threshold detection applications, though additional hysteresis can be added using the method described in the LT1720 datasheet Figure 3.
Can the LT1720CS8#TRPBF operate from a 3.3V supply?
Yes-the LT1720CS8#TRPBF supports supply voltages from 2.7V to 6V, making it fully compatible with 3.3V systems. At 3.3V, propagation delay increases slightly to ~5.0ns (vs. 4.5ns at 5V), and output drive capability remains rail-to-rail with VOH ≥ 2.9V and VOL ≤ 0.4V under 4mA load.
What is the input bias current specification for the LT1720CS8#TRPBF?
The LT1720CS8#TRPBF exhibits input bias current of –6μA to 0μA (typical –3μA), flowing *out* of both inputs due to its PNP-based differential input stage. This value is measured with both inputs held at 1V and remains stable across temperature; bias current drops to zero at the higher input when differential voltage exceeds ~100mV.
How is the LT1720CS8#TRPBF pinout optimized for high-speed layout?
The LT1720CS8#TRPBF pinout places inverting inputs (Pins 2 and 3) opposite outputs (Pins 6 and 7), with VCC (Pin 8) and GND (Pin 5) acting as shielding rails between them. This minimizes capacitive coupling-critical because just 0.02pF of output-to-input coupling can induce 4mV feedback at its 2V/ns slew rate, potentially causing oscillation without proper board-level isolation.
LT1720CS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- UltraFast™
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT1720CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1720CS8#TRPBF 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#TRPBF reliable?
The price and inventory of LT1720CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1720CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1720CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1720CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1720CS8#TRPBF?
LT1720CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1720CS8#TRPBF 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#TRPBF?
For technical support, including LT1720CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1720CS8#TRPBF requirements.
6.How does Aetrix verify that LT1720CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1720CS8#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1720CS8#TRPBF?
All LT1720CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1720CS8#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT1720CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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