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Analog Devices Inc. LT1711CMS8#PBF
- Part No.:
- LT1711CMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1711CMS8#PBF.pdf
- Description:
- IC COMPARATOR 1 W/LATCH 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,673
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Product details
Overview
LT1711CMS8#PBF from Analog Devices (formerly Linear Technology) is a single ultrafast rail-to-rail input/output comparator with internal TTL/CMOS-compatible latch, optimized for 2.4V–7V single or ±2.4V–±6V dual supplies. It delivers 4.5ns propagation delay at 20mV overdrive, rail-to-rail complementary outputs capable of sinking 10mA to within 0.5V of GND and sourcing 10mA to within 0.7V of V+, and operates from –40°C to 85°C in the 8-lead MSOP package. It is used in high-speed sampling circuits, crystal oscillator control, and pulse width modulation.
For engineers reviewing the LT1711CMS8#PBF datasheet, LT1711CMS8#PBF pinout, LT1711CMS8#PBF application, or LT1711CMS8#PBF equivalent, key selection considerations include propagation delay vs. overdrive, latch timing parameters (tSU = 1ns, tLPD = 5ns), rail-to-rail input common-mode range (–0.1V to V+ + 0.1V), output drive capability under load, and ±20mA absolute maximum output current rating.
Technical Context
The LT1711CMS8#PBF employs a high-gain, low-offset differential input stage with matched NPN/PNP pairs enabling rail-to-rail operation and input voltage tolerance beyond supply rails by 100mV. Its complementary Q/Q̅ outputs are internally latched via a dedicated enable pin with 100mV hysteresis, supporting flow-through or hold modes without external logic.
Propagation delay is specified with 10pF load and 100mV step input; differential delay (∆tPD ≤ 1.5ns) ensures precise edge alignment between rising/falling transitions. The device maintains stable operation across 2.4V–7V single-supply or ±2.4V–±6V dual-supply configurations, with PSRR+ ≥ 58dB and CMRR ≥ 56dB over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 4.5ns typical at 20mV overdrive - enables sub-5ns decision timing in high-speed A/D front-ends and sampling triggers. |
| Rail-to-Rail Input Range | –0.1V to V+ + 0.1V - supports sensing beyond supply rails, critical for overvoltage detection and crystal oscillator biasing. |
| Output Drive Capability | Sinks 10mA to within 0.5V of GND / sources 10mA to within 0.7V of V+ - directly interfaces with TTL/CMOS loads without level-shifting. |
| Latch Setup Time | 1ns - allows tight synchronization with high-frequency clock domains in automatic test equipment. |
| Input Offset Voltage | 0.5–6.0mV (max over temp) - ensures accurate threshold detection in precision window comparators and V/F converters. |
| Supply Voltage Range | 2.4V–7V single or ±2.4V–±6V dual - supports legacy 5V, modern 3V, and bipolar ±5V systems without redesign. |
| Output Timing Jitter | 11psRMS at 30MHz - preserves signal integrity in high-speed line receivers and clock recovery circuits. |
Pinout & Package
LT1711CMS8#PBF is housed in an 8-lead plastic MSOP (Mini Small Outline Package) with 0.65mm lead pitch, 3mm × 3mm body, and exposed pad for thermal enhancement. Pin 1 is V+, pin 2 is +IN, pin 3 is –IN, pin 4 is V–, pin 5 is LATCH ENABLE, pin 6 is GND, pin 7 is Q (noninverting output), and pin 8 is Q̅ (inverting output).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ (Pin 1) | Positive supply rail | Accepts 2.4V–7V single supply or positive rail of ±2.4V–±6V dual supply; powers internal amplifier and latch. |
| +IN (Pin 2) | Noninverting input | Rail-to-rail capable; accepts signals from –0.1V to V+ + 0.1V; paired with –IN for differential comparison. |
| –IN (Pin 3) | Inverting input | Rail-to-rail capable; complements +IN; enables hysteresis feedback without common-mode constraints. |
| V– (Pin 4) | Negative supply rail | Accepts 0V (ground) or –7V to 0V; defines lower rail for dual-supply operation and input common-mode floor. |
| LATCH ENABLE (Pin 5) | Digital latch control input | Logic-high enables data retention at Q/Q̅ outputs; built-in 100mV hysteresis rejects noise on slow-moving control signals. |
| GND (Pin 6) | Ground reference | System ground return path; must be low-impedance and separated from analog input traces per high-speed layout guidelines. |
| Q (Pin 7) | Noninverting output | Active-high rail-to-rail CMOS/TTL-compatible output; sinks up to 10mA at VOL ≤ 0.5V, sources up to 10mA at VOH ≥ V+ – 0.7V. |
| Q̅ (Pin 8) | Inverting output | Complementary to Q; provides differential signaling capability for noise-immune clock distribution and LVDS-like interfaces. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrafast 4.5ns propagation delay | Enables >100MHz toggle frequency and sub-5ns timing resolution in high-speed A/D converters and pulse discriminators. |
| Rail-to-rail inputs with 100mV beyond rails | Eliminates need for external level shifters when monitoring signals exceeding supply boundaries, e.g., in crystal oscillator tuning networks. |
| Matched complementary Q/Q̅ outputs | Supports true differential signaling and direct interface to both TTL and CMOS logic families without external inverters. |
| Integrated latch with 1ns setup time | Reduces external logic count in automatic test equipment and digital sampling systems requiring synchronized data capture. |
| Phase reversal immunity | Prevents output inversion during input overdrive conditions, ensuring reliable operation in fast transient environments like switching regulator current sense. |
Applications
| Crystal Oscillator Circuits | High Speed Sampling Circuits |
|---|---|
Use Scenario: Voltage-tunable crystal oscillator (VCXO) generating 4× NTSC subcarrier (14.31818MHz) with 0–5V tuning input. IC Role / Device Role / Timing Role: LT1711CMS8#PBF functions as series-resonant oscillator core, using varactor diode biasing and rail-to-rail input to sustain oscillation across full tuning range. Use Value: Achieves ±240ppm frequency deviation with <11psRMS jitter, enabling phase-locked loop stability in broadcast video timing systems. | Use Scenario: Front-end comparator in high-speed digitizers capturing transient pulses from photodiodes or RF detectors. IC Role / Device Role / Timing Role: LT1711CMS8#PBF performs threshold discrimination with 4.5ns delay, feeding latched output to FPGA-based time-of-flight measurement logic. Use Value: Sub-5ns timing resolution supports <200ps time-stamping accuracy, critical for laser rangefinders and time-domain reflectometry. |
| Current Sense for Switching Regulators | High Speed Triggers |
Use Scenario: Peak current mode control in synchronous buck converters operating at 1MHz+ switching frequencies. IC Role / Device Role / Timing Role: LT1711CMS8#PBF compares sensed inductor current against reference ramp, with latch holding fault state until next cycle reset. Use Value: 1ns latch setup time ensures cycle-by-cycle current limiting without propagation delay-induced instability or false triggering. | Use Scenario: Edge-triggered event detector in particle physics instrumentation requiring precise coincidence timing. IC Role / Device Role / Timing Role: LT1711CMS8#PBF detects leading edges of fast pulses (<10ns rise time) and latches result for downstream timestamping. Use Value: Differential propagation delay ≤1.5ns minimizes channel-to-channel skew, enabling <50ps coincidence window resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1719CS8#PBF | Single-supply only (2.7V–6V); no negative supply pin; rail-to-rail outputs with level-shifting capability. | Optimized for 3V/5V-only systems; lacks ±5V dual-supply support and extended input common-mode beyond rails. | Select when system uses only positive supply and requires integrated level shifting for mixed-voltage interfacing. |
| LT1713CMS8#PBF | 7ns propagation delay; 5mA supply current (vs. 19mA typ. for LT1711); same MSOP-8 package and rail-to-rail I/O. | Lower power consumption but slower response; suitable for battery-powered portable test gear where speed <7ns is acceptable. | Select when 7ns delay suffices and average supply current reduction from 19mA to 5mA improves thermal budget or battery life. |
Compared with LT1719CS8#PBF, LT1711CMS8#PBF supports bipolar supplies and wider input range, while LT1713CMS8#PBF trades 2.5ns speed for >60% lower quiescent current-enabling optimization for either precision timing headroom or power-constrained deployments.
Availability
LT1711CMS8#PBF is available at Aetrix Electronics and suitable for high-speed automatic test equipment, crystal oscillator circuits, and current sense for switching regulators requiring stable component supply and guaranteed industrial temperature performance.
Supply support for LT1711CMS8#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 documentation, and long-term manufacturing commitment for legacy Linear parts including the LT1711 family.
The LT1711CMS8#PBF belongs to Linear's UltraFast™ comparator product line, designed specifically for applications demanding sub-5ns decision latency, rail-to-rail signal handling, and integrated data retention-targeting test & measurement, communications infrastructure, and precision power control.
FAQ
What is the maximum supply voltage rating for LT1711CMS8#PBF?
The LT1711CMS8#PBF has an absolute maximum supply voltage rating of 12.6V between V+ and V–, and ±10V between V– and GND. Operation beyond these limits risks permanent damage. For reliable long-term use, the recommended operating range is 2.4V–7V single supply or ±2.4V–±6V dual supply, as validated in the datasheet's electrical characteristics table.
Does LT1711CMS8#PBF require external hysteresis for stable operation?
No, the LT1711CMS8#PBF does not require external hysteresis for basic comparator operation due to its internal design, but hysteresis is recommended in noisy environments or for Schmitt trigger behavior. Its rail-to-rail inputs allow flexible feedback configurations-e.g., connecting Q or Q̅ to –IN or +IN respectively-without violating common-mode constraints, as confirmed in Figure 2 of the LT1711/LT1712 datasheet.
Can LT1711CMS8#PBF operate from a single 3V supply?
Yes, the LT1711CMS8#PBF is fully specified and characterized for 3V single-supply operation (V+ = 3V, V– = 0V). Key parameters-including 4.5ns propagation delay, rail-to-rail input range (–0.1V to 3.1V), and output swing (VOL ≤ 0.4V, VOH ≥ 2.3V at 1mA)-are guaranteed at 3V per the Electrical Characteristics table, making it suitable for modern low-voltage portable instrumentation.
What is the function of the LATCH ENABLE pin on LT1711CMS8#PBF?
The LATCH ENABLE pin (Pin 5) controls data retention at the Q and Q̅ outputs. When held high, it latches and holds the current comparator decision; when low, the outputs follow input changes in real time. It features 100mV hysteresis to reject noise, requires VIH ≥ 2.4V and VIL ≤ 0.8V, and exhibits 1ns setup time-ensuring robust synchronization in high-speed digital acquisition systems using LT1711CMS8#PBF.
Is LT1711CMS8#PBF pin-compatible with other comparators in the LT171x family?
No, LT1711CMS8#PBF is not pin-compatible with LT1712 (16-pin SSOP) or LT1713 (same MSOP-8 package but different pin mapping). While LT1713CMS8#PBF shares the MSOP-8 footprint, its pinout differs: LT1711 uses Pin 4 = V–, Pin 5 = LATCH, Pin 6 = GND; LT1713 assigns Pin 4 = GND, Pin 5 = V–, Pin 6 = LATCH. PCB layout must match the exact pin configuration defined for LT1711CMS8#PBF in the MS8 package drawing.
LT1711CMS8#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:
- with Latch
- Number of Elements:
- 1
- Output Type:
- CMOS, Complementary, Rail-to-Rail, TTL
- Voltage - Supply, Single/Dual (±):
- 2.4V ~ 12V, ±2.4V ~ 6V
- :
- 5mV @ 5V
- Voltage - Input Offset (Max):
- 5µA @ 5V
- Current - Input Bias (Max):
- 20mA
- Current - Output (Typ):
- 22mA
- Current - Quiescent (Max):
- 75dB CMRR, 85dB PSRR
- CMRR, PSRR (Typ):
- 6ns
- Propagation Delay (Max):
- -
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-MSOP
LT1711CMS8#PBF FAQ
1.How can I place an order for LT1711CMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1711CMS8#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 LT1711CMS8#PBF reliable?
The price and inventory of LT1711CMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1711CMS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1711CMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1711CMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1711CMS8#PBF?
LT1711CMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1711CMS8#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 LT1711CMS8#PBF?
For technical support, including LT1711CMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1711CMS8#PBF requirements.
6.How does Aetrix verify that LT1711CMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1711CMS8#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 LT1711CMS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1711CMS8#PBF?
All LT1711CMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1711CMS8#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 LT1711CMS8#PBF part is unused and in its original packaging.
Return procedure for LT1711CMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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