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Analog Devices Inc. LT1671CS8#TRPBF
- Part No.:
- LT1671CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1671CS8#TRPBF.pdf
- Description:
- IC COMPARATOR 1 W/LATCH 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,604
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Product details
Overview
LT1671CS8#TRPBF from Analog Devices (acquired Linear Technology) is a low-power, 60ns ground-sensing comparator with complementary TTL/CMOS outputs and integrated latch. It operates from single 5V or dual ±5V supplies, features 0.8mV offset voltage, 450µA supply current, and input common-mode range extending to the negative rail - enabling precision zero-crossing detection in switching regulator current sense circuits.
For engineers reviewing the LT1671CS8#TRPBF datasheet, LT1671CS8#TRPBF pinout, LT1671CS8#TRPBF application, or LT1671CS8#TRPBF equivalent, this page delivers verified electrical specs, latch timing constraints (tSU = –15ns, tH = 35ns), propagation delay vs. overdrive behavior, SO-8 package mechanical data, and real-world crystal oscillator and adaptive trigger implementations.
Technical Context
The LT1671CS8#TRPBF employs a PNP differential input stage enabling rail-to-rail common-mode operation down to V–, with no minimum input slew rate requirement - critical for slow-transition signals in line receivers and sampling circuits. Its output stage provides active pull-up/pull-down drive into TTL, CMOS, or passive loads, minimizing cross-conduction current while maintaining 60ns propagation delay at 20mV overdrive.
Latch functionality is implemented via a dedicated LATCH ENABLE pin (Pin 5) that holds Q and Q̅ outputs when high; latch propagation delay is 60ns, setup time is –15ns (data valid 15ns after latch assertion), and hold time is 35ns. Input bias current flows out of both inputs (120–280nA typical), varying with input voltage polarity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 60ns at 20mV overdrive - enables sub-10MHz sampling in A/D converters and fast pulse discriminators. |
| Input Offset Voltage | 0.8mV max - supports precision threshold detection in current-sense feedback loops with <1% error at 100mV sense levels. |
| Supply Current | 450µA typical - allows battery-powered zero-crossing detectors and portable instrumentation with >1-year runtime on coin cells. |
| Input Common-Mode Range | –5V to +3.5V on ±5V supply - permits direct ground-referenced sensing in buck converter low-side current monitoring. |
| Output Drive | VOH = 2.7V min @ 400µA, VOL = 0.5V max @ –400µA - ensures robust TTL logic interfacing without external level-shifting. |
| Latch Hold Time | 35ns - defines minimum input stability window after LATCH pin assertion, constraining maximum input transition rate in gated sampling. |
| Operating Temperature | –40°C to 85°C - validated for industrial motor control and telecom line receiver applications without derating. |
Pinout & Package
LT1671CS8#TRPBF is housed in an 8-lead plastic SO (Small Outline) package, 0.150" wide, with standard JEDEC MS-012AC dimensions (5.0mm × 4.0mm body, 1.27mm pitch). Pin 1 is V+, Pin 6 is GND, and all pins are lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ (Pin 1) | Positive Supply Input | Accepts 4.6V–5.4V for single-supply operation or up to +7V absolute max; powers internal bias and output stages. |
| +IN (Pin 2) | Noninverting Input | Accepts signals down to V– rail; phase reversal avoided even if voltage exceeds V+ by ≤12V (with current limiting). |
| –IN (Pin 3) | Inverting Input | Same common-mode and overvoltage tolerance as +IN; differential input voltage rated ±12V. |
| V– (Pin 4) | Negative Supply Input | Connect to 0V (single supply) or –5V (dual supply); enables ground-sensing operation with inputs referenced to system ground. |
| LATCH ENABLE (Pin 5) | Asynchronous Latch Control | High = latch enabled (outputs frozen); low = transparent mode; no internal hysteresis; driven by TTL/CMOS logic. |
| GND (Pin 6) | Ground Reference | Return path for input bias currents and output sink current; must be low-impedance for stable propagation delay. |
| Q OUT (Pin 7) | Noninverting Logic Output | Active-high TTL-compatible output; high when +IN > –IN and LATCH ENABLE = low; drives 4mA load. |
| Q̅ OUT (Pin 8) | Inverting Logic Output | Active-low complement of Q OUT; enables direct connection to D-latches or SR flip-flops without inverters. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Extends to V– rail on ±5V or single 5V supplies - eliminates need for level-shifting in ground-referenced current sensing. |
| No minimum input slew rate | Stable operation with arbitrarily slow input transitions - removes slew-rate-dependent timing uncertainty in zero-crossing detectors. |
| Integrated TTL/CMOS latch | Latch enable pin (Pin 5) freezes Q/Q̅ outputs with 35ns hold time - enables synchronous sampling without external flip-flops. |
| Complementary outputs | Q and Q̅ provide true/complement logic levels simultaneously - reduces component count in edge-triggered clock generation. |
| Pin compatibility with LT1394/LT1016/LT1116 | SO-8 footprint matches legacy comparators - allows drop-in replacement in existing designs without PCB rework. |
Applications
| High-Speed A/D Converter Front-End | Switching Regulator Current Sense |
|---|---|
Use Scenario: Sampling analog input at >10MSPS using flash or pipeline ADC architectures requiring precise, low-delay threshold comparison. IC Role / Device Role / Timing Role: LT1671CS8#TRPBF serves as the core comparator in the ADC's flash encoder, converting analog input to thermometer-coded digital output within 60ns. Use Value: 60ns propagation delay and 15ns differential delay ensure monotonic code transitions and minimize aperture jitter in multi-bit conversion. |
Use Scenario: Monitoring MOSFET source current in synchronous buck converters to trigger overcurrent protection before inductor saturation. IC Role / Device Role / Timing Role: LT1671CS8#TRPBF compares shunt voltage against a fixed reference, with output latched to hold fault state during controller response latency. Use Value: Ground-sensing input range allows direct connection to low-side shunt; latch hold time (35ns) guarantees fault capture even under nanosecond-scale current spikes. |
| Crystal Oscillator Circuit | Adaptive Line Receiver |
Use Scenario: Generating stable 1MHz–10MHz clock signals using AT-cut quartz crystals in embedded microcontroller timing systems. IC Role / Device Role / Timing Role: LT1671CS8#TRPBF functions as gain element and limiter in a Pierce oscillator configuration, sustaining oscillation via crystal feedback path. Use Value: Low input bias current (120nA typ) prevents crystal drive-level degradation; complementary outputs enable direct buffering of square-wave clocks. |
Use Scenario: Recovering digital data from fiber-optic or coaxial line receivers where input amplitude varies >85:1 due to cable loss or transmitter drift. IC Role / Device Role / Timing Role: LT1671CS8#TRPBF acts as adaptive threshold comparator, with its positive input biased by a ratiometric peak-detected midpoint voltage. Use Value: No minimum slew rate requirement allows reliable triggering on distorted or attenuated waveforms; latch capability freezes decision during signal settling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1394CS8#TRPBF | 7ns propagation delay, 6mA supply current, no latch, same SO-8 pinout. | Better speed for ultrafast sampling, but higher power and no latch - requires external storage for sampled data. | Select when <10ns delay is mandatory and latch functionality is implemented elsewhere in the design. |
| LT1720CS8#TRPBF | Dual-channel, 4.5ns per comparator, 4mA supply current, no latch, SO-8 package. | Provides two independent comparators in same footprint - suitable for differential signaling or window detection. | Choose for space-constrained dual-threshold applications where latch is unnecessary and speed outweighs power budget. |
Compared with LT1671CS8#TRPBF, LT1394CS8#TRPBF trades latch capability and 450µA quiescent current for 7ns speed, while LT1720CS8#TRPBF offers dual channels at 4.5ns but doubles supply current and omits latching - making LT1671CS8#TRPBF optimal for single-channel, low-power, latch-integrated timing-critical systems.
Availability
LT1671CS8#TRPBF is available at Aetrix Electronics and suitable for high-speed A/D converters, switching regulator current sense circuits, crystal oscillator modules, and adaptive line receivers requiring stable component supply across industrial temperature ranges.
Supply support for LT1671CS8#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through acquisition of Linear Technology in 2017.
The LT1671CS8#TRPBF belongs to Linear Technology's precision high-speed comparator family, designed specifically for applications demanding ground-sensing capability, latch retention, and stable nanosecond-scale timing in power management, data acquisition, and clock generation systems.
FAQ
What is the maximum operating supply voltage for LT1671CS8#TRPBF?
The LT1671CS8#TRPBF has an absolute maximum total supply voltage (V+ to V–) of 12V. Its positive supply voltage must not exceed +7V, and negative supply voltage must not go below –7V. For reliable operation, use ±5V dual supplies or a single 5V supply with V– tied to ground - staying within the 4.6V–5.4V recommended range for V+ ensures specified propagation delay and output swing performance in the LT1671CS8#TRPBF.
Does LT1671CS8#TRPBF require external hysteresis for noise immunity?
No, the LT1671CS8#TRPBF does not include internal hysteresis, and external hysteresis is optional depending on application noise levels. Its lack of built-in hysteresis allows precise threshold setting, but in noisy environments (e.g., motor drive current sensing), a small positive feedback resistor (e.g., 10MΩ from output to +IN) can add ~1mV hysteresis. The LT1671CS8#TRPBF's 0.8mV offset voltage and rail-to-rail input make it compatible with such configurations without compromising common-mode range.
Can LT1671CS8#TRPBF operate with inputs exceeding the positive supply rail?
Yes, the LT1671CS8#TRPBF inputs can safely exceed V+ by up to 12V, limited by the ±12V differential input rating and 10mA absolute maximum input current. An internal diode clamps each input to V+, so operation remains functional as long as current is limited externally (e.g., with series resistors). This feature enables direct interface to overvoltage-tolerant sensors without level-shifting - a key capability confirmed in the LT1671CS8#TRPBF datasheet's Absolute Maximum Ratings and Applications Information sections.
What is the purpose of the LATCH ENABLE pin on LT1671CS8#TRPBF?
Pin 5 (LATCH ENABLE) on the LT1671CS8#TRPBF controls asynchronous data retention: when high, it freezes the Q and Q̅ outputs regardless of input changes; when low, the comparator operates transparently. This latch function eliminates need for external D-flip-flops in sampling circuits. The LT1671CS8#TRPBF specifies 35ns hold time and –15ns setup time, meaning input stability is required 35ns after latch assertion and valid up to 15ns after - enabling precise timing control in high-speed data acquisition systems using the LT1671CS8#TRPBF.
Is LT1671CS8#TRPBF suitable for single-supply 3.3V operation?
No, the LT1671CS8#TRPBF is not characterized or guaranteed for 3.3V single-supply operation. Its electrical specifications (e.g., VOH = 2.7V min @ 400µA) assume V+ ≥ 4.6V, and the input common-mode range on single supply is specified only for 0V to 3.5V - which requires V+ ≥ 5V to maintain full 3.5V upper limit. Using 3.3V risks degraded propagation delay, reduced output swing, and potential failure to meet latch timing specs. For 3.3V systems, consider alternatives like LTC6702 or AD8611 explicitly rated for 2.7V–5.5V operation instead of the LT1671CS8#TRPBF.
LT1671CS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- with Latch
- Number of Elements:
- 1
- Output Type:
- CMOS, Complementary, TTL
- Voltage - Supply, Single/Dual (±):
- -
- :
- 2.5mV @ ±5V
- Voltage - Input Offset (Max):
- 0.28µA @ ±5V
- Current - Input Bias (Max):
- 20mA
- Current - Output (Typ):
- 800µA
- Current - Quiescent (Max):
- 100dB CMRR, 85dB PSRR
- CMRR, PSRR (Typ):
- 80ns
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SO
LT1671CS8#TRPBF FAQ
1.How can I place an order for LT1671CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1671CS8#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 LT1671CS8#TRPBF reliable?
The price and inventory of LT1671CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1671CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1671CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1671CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1671CS8#TRPBF?
LT1671CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1671CS8#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 LT1671CS8#TRPBF?
For technical support, including LT1671CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1671CS8#TRPBF requirements.
6.How does Aetrix verify that LT1671CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1671CS8#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 LT1671CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1671CS8#TRPBF?
All LT1671CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1671CS8#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 LT1671CS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1671CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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