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Analog Devices Inc. LT1719IS8#PBF
- Part No.:
- LT1719IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1719IS8#PBF.pdf
- Description:
- IC COMPARATOR 1 GEN PUR 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,315
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Product details
Overview
LT1719IS8#PBF from Analog Devices (formerly Linear Technology) is an UltraFast™ rail-to-rail output comparator optimized for low-voltage, high-speed operation in industrial and embedded timing-critical systems. It delivers 4.5ns propagation delay at 20mV overdrive, supports dual supply operation (VCC/VEE input stage, +VS/GND output stage), features internal 3.5mV hysteresis, and operates across –40°C to +85°C. It is used in crystal oscillator circuits, level translation, and zero-crossing detection where sub-5ns response and robust input common-mode range (VEE – 0.1V to VCC – 1.2V) are required.
For engineers reviewing the LT1719IS8#PBF datasheet, LT1719IS8#PBF pinout, LT1719IS8#PBF application, or LT1719IS8#PBF equivalent, key selection considerations include its SO-8 package with separate input/output supplies, shutdown current of 0.1μA, TTL/CMOS-compatible rail-to-rail output drive, and guaranteed performance over extended temperature range - critical for portable instrumentation, precision clock conditioning, and high-reliability signal discrimination.
Technical Context
The LT1719IS8#PBF employs a complementary bipolar process with PNP input stage and symmetric rail-to-rail CMOS/TTL-compatible output stage. Its internal hysteresis (typ. 3.5mV) eliminates need for external feedback in noisy environments, while separate VCC/VEE and +VS/GND supplies enable independent analog input referencing and logic-level output translation - e.g., –5V/5V input stage driving 3V logic outputs.
Propagation delay is specified down to 4.2ns under –5V VEE condition and remains stable across 2.7V–6V output supply range. Input common-mode range extends from VEE – 0.1V to VCC – 1.2V, and absolute maximum ratings allow VCC–VEE up to 12V and +VS–GND up to 7V - supporting flexible power configurations including ±5V input with 3V output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 4.5ns at 20mV overdrive (25°C, VEE = 0V); enables sub-5ns timing-critical decision paths in sampling circuits and delay lines. |
| Input Offset Voltage | 2.5mV max (full temp range); ensures accurate threshold detection without calibration in discriminators and zero-crossing detectors. |
| Supply Range | VCC–VEE: 2.7V–10.5V; +VS–GND: 2.7V–6V; allows mixed-supply operation such as ±5V input stage with 3V output logic interface. |
| Input Hysteresis | 3.5mV typ; provides noise immunity for slow-moving signals without external components - critical for reliable crystal oscillator startup and threshold sensing. |
| Shutdown Current | 0.1μA max (full temp range); extends battery life in portable applications by disabling comparator while preserving fast wake-up (350ns). |
| Rail-to-Rail Output | VOH = +VS – 0.4V, VOL = 0.4V (at load); directly interfaces to TTL/CMOS without level-shifting, reducing BOM count in digital control subsystems. |
| Common-Mode Range | VEE – 0.1V to VCC – 1.2V; supports inputs below ground (e.g., –100mV) and near supply rails - essential for single-supply sensor front-ends. |
Pinout & Package
LT1719IS8#PBF is housed in an 8-lead plastic SO (SO-8) package, 1.27mm pitch, with exposed pad not present. The package supports reflow soldering per JEDEC J-STD-020 and is RoHS-compliant (Pb-free finish).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Positive supply for input stage; must be ≥ VEE + 2.7V and ≤ VEE + 10.5V - sets upper bound of analog input common-mode range. |
| 2 | +IN | Noninverting input; PNP-based, bias current flows out; requires low-impedance source (<1kΩ) to minimize RC-induced delay. |
| 3 | –IN | Inverting input; same PNP structure as +IN; differential input voltage may exceed supply rails within absolute max limits. |
| 4 | VEE | Negative supply for input stage and substrate; must be ≤ GND; defines lower bound of input common-mode range (VEE – 0.1V). |
| 5 | GND | Ground reference for output stage; tied to system ground in most configurations; shields inputs from outputs in PCB layout. |
| 6 | SHDN | Active-high shutdown control; pulls to +VS – 0.5V to disable; draws <0.1μA when open - enables low-power sleep without external pull-down. |
| 7 | OUT | CMOS/TTL-compatible rail-to-rail output; capable of sourcing/sinking 10mA; slew rate ~2V/ns - requires short traces or termination to prevent ringing. |
| 8 | +VS | Positive supply for output stage; independent of VCC/VEE; sets VOH level and output logic swing (e.g., 3V or 5V compatible). |
Key Features
| Feature | Design Value |
|---|---|
| UltraFast propagation | 4.5ns at 20mV overdrive - enables >200MHz toggle rates in high-speed sampling and clock recovery loops. |
| Dual-supply architecture | Separate VCC/VEE (input) and +VS/GND (output) - permits analog input referenced to –5V while driving 3V CMOS logic, eliminating level shifters. |
| Internal hysteresis | 3.5mV typ - stabilizes output against noise on slowly varying inputs, removing need for external positive feedback in threshold detectors. |
| Rail-to-rail output drive | VOH = +VS – 0.4V, VOL = 0.4V @ 10mA - ensures full logic swing compatibility with 3V/5V TTL and CMOS families without external resistors. |
| Low-power shutdown | 0.1μA max disabled current - reduces system standby power in battery-operated instruments and portable test equipment. |
Applications
| Crystal Oscillator Circuits | Level Translators |
|---|---|
|
Use Scenario: Sustaining oscillation in AT-cut crystal tanks operating from 1MHz to 10MHz with 2.7V–6V supply. IC Role / Device Role / Timing Role: High-gain, low-delay comparator providing phase-inverting feedback path with precise zero-crossing detection. Use Value: 4.5ns propagation delay and 3.5mV hysteresis ensure reliable startup and stable oscillation even under wide temperature variation (–40°C to +85°C). |
Use Scenario: Converting 5V TTL signals to 3V CMOS logic levels in mixed-voltage FPGA I/O banks. IC Role / Device Role / Timing Role: Rail-to-rail output comparator acting as a supply-independent voltage threshold translator. Use Value: Separate +VS and VCC supplies allow 5V input stage to drive 3V output logic without external level-shifting components or timing penalty. |
| Threshold Detectors/Discriminators | Zero-Crossing Detectors |
|
Use Scenario: Detecting overvoltage events on DC power rails in industrial PLC modules. IC Role / Device Role / Timing Role: Precision comparator with known trip points (±1.5mV) and low drift (10μV/°C) for repeatable fault triggering. Use Value: 2.5mV max input offset and 3.5mV hysteresis provide clean, chatter-free switching at defined thresholds without software debouncing. |
Use Scenario: Identifying AC line zero crossings in motor control inverters for synchronized gate drive timing. IC Role / Device Role / Timing Role: High-speed comparator with wide input common-mode range (–100mV to 3.8V) accepting bipolar AC signals directly. Use Value: Input range extending 100mV below ground enables direct connection to transformer-coupled AC inputs without DC biasing networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1720IS8#PBF | Dual-channel version; identical speed (4.5ns), same SO-8 package; higher quiescent current (5.5mA vs 4.2mA). | Used where two independent comparators are needed in same footprint - e.g., window comparator or differential pair detection. | Select LT1720IS8#PBF only when dual functionality is required; LT1719IS8#PBF remains optimal for single-channel space- or cost-constrained designs. |
| MAX961ESA+ | Single 2.7V–5.5V supply; no separate input/output rails; 4.8ns delay; 1.5mV offset; lacks shutdown mode. | Suitable for low-voltage, single-supply systems where rail separation is unnecessary - e.g., battery-powered sensors. | Choose MAX961ESA+ for simplified supply design; select LT1719IS8#PBF when mixed-supply operation, shutdown, or extended common-mode range is mandatory. |
Compared with LT1720IS8#PBF and MAX961ESA+, the LT1719IS8#PBF uniquely combines single-channel optimization, independent input/output supplies, sub-5ns delay, and ultra-low shutdown current - making it the preferred choice for thermally constrained, multi-rail industrial timing applications requiring long-term reliability across –40°C to +85°C.
Availability
LT1719IS8#PBF is available at Aetrix Electronics and suitable for crystal oscillator circuits, level translators, threshold discriminators, and zero-crossing detectors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1719IS8#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT1719 belongs to Linear Technology's UltraFast™ comparator family, designed specifically for high-speed signal conditioning in timing-critical systems where nanosecond-level propagation delay, rail-to-rail output drive, and robust operation across wide temperature and supply ranges are essential.
FAQ
What is the operating temperature range of the LT1719IS8#PBF?
The LT1719IS8#PBF is rated for operation from –40°C to +85°C (I-grade). This extended temperature range is validated across all key parameters including propagation delay, input offset voltage, and shutdown current - ensuring reliable performance in industrial control, outdoor instrumentation, and automotive under-hood applications where thermal stress is significant. The LT1719IS8#PBF maintains 4.5ns typical delay and 0.1μA shutdown current across this full range.
How does the LT1719IS8#PBF achieve rail-to-rail output operation?
The LT1719IS8#PBF uses a complementary bipolar output stage that actively drives the output to within 0.4V of either +VS or GND under 10mA load. This rail-to-rail capability is enabled by independent +VS and GND pins (pins 8 and 5), decoupling output logic swing from the input-stage supplies (VCC/VEE). As a result, the LT1719IS8#PBF can deliver full TTL/CMOS-compatible logic levels regardless of input supply configuration - a key advantage over single-supply comparators.
Can the LT1719IS8#PBF operate with different input and output supply voltages?
Yes - the LT1719IS8#PBF is explicitly designed for dual-supply operation: VCC/VEE powers the input stage (2.7V–10.5V range), while +VS/GND powers the output stage (2.7V–6V range). For example, it can accept ±5V analog inputs (VCC = 5V, VEE = –5V) while driving 3V CMOS logic (+VS = 3V, GND = 0V). This separation eliminates level-shifting components and simplifies mixed-voltage system design - a core feature confirmed in the LT1719IS8#PBF datasheet's power configuration diagrams.
What is the purpose of the internal hysteresis in the LT1719IS8#PBF?
The LT1719IS8#PBF integrates 3.5mV typical internal hysteresis to prevent output oscillation when comparing slowly changing or noisy input signals - such as sine waves in crystal oscillators or sensor outputs near threshold. This hysteresis creates distinct upper (VTRIP+) and lower (VTRIP–) trip points, eliminating need for external positive feedback. Unlike many comparators, the LT1719IS8#PBF's hysteresis is tightly controlled and stable across temperature and supply voltage, ensuring predictable behavior in threshold detectors and discriminators.
Does the LT1719IS8#PBF require external bypass capacitors?
Yes - the LT1719IS8#PBF requires local bypassing to ensure stability and maintain specified 4.5ns propagation delay. The datasheet recommends a 10nF ceramic capacitor placed adjacent to the device (between +VS and GND, and between VCC and VEE), plus a 2.2μF tantalum capacitor within 5cm. These capacitors suppress supply transients induced by the 2V/ns output slew rate and prevent oscillations caused by parasitic coupling. Failure to implement proper bypassing may result in increased jitter, delayed wake-up, or erratic output behavior - all documented in the LT1719IS8#PBF application notes.
LT1719IS8#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:
- 1
- Output Type:
- CMOS, Rail-to-Rail, TTL
- Voltage - Supply, Single/Dual (±):
- 2.7V ~ 6V
- :
- 2.5mV @ ±5V
- Voltage - Input Offset (Max):
- 6µA @ ±5V
- Current - Input Bias (Max):
- 20mA
- Current - Output (Typ):
- 9mA
- Current - Quiescent (Max):
- 70dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 13ns
- Propagation Delay (Max):
- 7mV
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SO
LT1719IS8#PBF FAQ
1.How can I place an order for LT1719IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1719IS8#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 LT1719IS8#PBF reliable?
The price and inventory of LT1719IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1719IS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1719IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1719IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1719IS8#PBF?
LT1719IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1719IS8#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 LT1719IS8#PBF?
For technical support, including LT1719IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1719IS8#PBF requirements.
6.How does Aetrix verify that LT1719IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1719IS8#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 LT1719IS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1719IS8#PBF?
All LT1719IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1719IS8#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 LT1719IS8#PBF part is unused and in its original packaging.
Return procedure for LT1719IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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