Analog Devices Inc. LT1711CMS8#TRPBF

Overview

LT1711CMS8#TRPBF 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 inputs extending 100mV beyond supply rails, and complementary outputs sourcing/sinking 10mA while maintaining TTL/CMOS logic compatibility - enabling use in high-speed sampling circuits, crystal oscillator feedback loops, and pulse width modulators.

For engineers reviewing the LT1711CMS8#TRPBF datasheet, LT1711CMS8#TRPBF pinout, LT1711CMS8#TRPBF application, or LT1711CMS8#TRPBF equivalent, key selection criteria 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 MSOP-8 thermal performance (θJA = 250°C/W).

Technical Context

The LT1711CMS8#TRPBF employs a bipolar differential input stage with NPN/PNP pairs enabling true rail-to-rail input operation and controlled bias current polarity reversal across the common-mode range. Its matched complementary outputs are internally terminated to support direct interfacing with TTL or CMOS loads without external level-shifting.

Latch functionality is implemented via an internal edge-triggered flip-flop with 100mV hysteresis on the LATCH ENABLE pin, ensuring robust operation against slow or noisy control signals. Propagation delay is specified with 10pF load and 1kΩ test load configuration per supply condition, and timing jitter is characterized at 11psRMS for 30MHz sine-wave input.

Key Specifications

Pinout & Package

LT1711CMS8#TRPBF is housed in an 8-lead plastic MSOP package (3mm × 3mm, 0.65mm pitch), rated for –40°C to 85°C operation with θJA = 250°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed comparator applications.

Compared with LT1711CMS8#TRPBF, LT1719CS6#TRMPBF simplifies power design in single-supply systems but sacrifices ±5V compatibility, while LT1720CGN#PBF offers channel density at the cost of larger footprint and higher layout complexity for isolated signal routing.

Availability

LT1711CMS8#TRPBF is available at Aetrix Electronics and suitable for high-speed automatic test equipment, crystal oscillator circuits, and pulse width modulators requiring stable component supply across industrial temperature ranges.

Supply support for LT1711CMS8#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 acquired Linear Technology in 2017 and maintains full product support, datasheet archives, and application engineering for legacy Linear parts including the LT1711 family.

The LT1711CMS8#TRPBF belongs to Linear's UltraFast™ comparator product line, designed specifically for applications demanding sub-5ns decision latency, rail-to-rail signal handling, and integrated latching - targeting test instrumentation, communications infrastructure, and precision timing systems.

FAQ

What is the maximum supply voltage rating for LT1711CMS8#TRPBF?

The LT1711CMS8#TRPBF has an absolute maximum supply voltage rating of V+ to V– ≤ 12.6V. For single-supply operation, V+ to GND must not exceed 12.6V; for dual-supply, V– to GND must remain between –10V and 0.3V. Exceeding these limits risks permanent damage. The recommended operating range remains 2.4V–7V (single) or ±2.4V–±6V (dual), as specified in the LT1711CMS8#TRPBF datasheet.

Does LT1711CMS8#TRPBF support rail-to-rail input operation with inputs exceeding the supply rails?

Yes, the LT1711CMS8#TRPBF supports rail-to-rail input operation with common-mode voltage extending 100mV beyond both V+ and V– rails - e.g., –0.1V to V+ + 0.1V on single supply. Inputs beyond this range may cause phase reversal unless protected by external Schottky clamps, as internal substrate diodes can conduct. The LT1711CMS8#TRPBF is explicitly characterized and guaranteed for correct operation within this extended range.

How does the latch function behave on LT1711CMS8#TRPBF during power-up?

During power-up, the LT1711CMS8#TRPBF latch defaults to transparent (flow-through) mode because the LATCH ENABLE pin floats low when unconnected. To ensure deterministic behavior, tie LATCH ENABLE to GND for transparent operation or drive it high only after supplies stabilize. The LT1711CMS8#TRPBF latch holds its last valid output state when ENABLE is high, and updates synchronously on the rising edge when ENABLE transitions from low to high.

Can LT1711CMS8#TRPBF drive 50Ω transmission lines directly?

No, the LT1711CMS8#TRPBF is not designed to drive 50Ω loads continuously. Its outputs are rated for ±10mA into resistive loads, corresponding to ~500Ω minimum at 5V swing. Driving 50Ω would require >100mA, exceeding absolute maximum ratings. For 50Ω line driving, use external buffer amplifiers or dedicated high-speed line drivers - the LT1711CMS8#TRPBF is intended for logic interfacing and medium-impedance sampling nodes.

What is the thermal resistance (θJA) of LT1711CMS8#TRPBF in MSOP-8 package?

The LT1711CMS8#TRPBF in the 8-lead MSOP package has a junction-to-ambient thermal resistance (θJA) of 250°C/W, as specified in the official Linear Technology datasheet. This value assumes standard JEDEC 2-layer board conditions. Actual thermal performance depends on PCB copper area, via count, and airflow; for continuous 26mA total supply current at 85°C ambient, die temperature must be monitored to stay below TJMAX = 150°C.