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Analog Devices Inc. LT1719CS8#PBF
- Part No.:
- LT1719CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1719CS8#PBF.pdf
- Description:
- IC COMPARATOR 1 GEN PUR 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,330
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Product details
Overview
LT1719CS8#PBF from Analog Devices (formerly Linear Technology) is an UltraFast rail-to-rail comparator in SO-8 package, optimized for low-voltage operation with 4.5ns propagation delay at 20mV overdrive, 4.2mA supply current at 3V, and separate input/output supply rails. It serves as a high-speed threshold detector in crystal oscillator circuits, level translators, and zero-crossing detection where fast edge response and TTL/CMOS compatibility are critical.
For engineers reviewing the LT1719CS8#PBF datasheet, LT1719CS8#PBF pinout, LT1719CS8#PBF application, or LT1719CS8#PBF equivalent, this page delivers verified electrical parameters, validated SO-8 pin functions, confirmed shutdown behavior, real-world timing jitter (11–15ps RMS), and two technically documented alternative comparators - all extracted from the official LT1719 datasheet (1719fa) and Analog Devices product documentation.
Technical Context
The LT1719CS8#PBF implements a complementary bipolar input stage with internal 3.5mV typical hysteresis, enabling stable operation with slow-moving inputs without external feedback. Its dual-supply architecture separates VCC/VEE (input stage) from +VS/GND (output stage), allowing independent analog input ranges and logic-level outputs.
Propagation delay is specified down to 4.2ns under –5V VEE bias and exhibits <0.5ns skew between rising and falling edges. Output drive is symmetric rail-to-rail (VOH = +VS – 0.4V, VOL = 0.4V @ 10mA sink), supporting direct interface to TTL/CMOS and analog translation applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 4.5ns typical at 20mV overdrive - enables sub-5ns timing-critical sampling and clock recovery |
| Supply Voltage Range | VCC–VEE = 2.7V to 10.5V; +VS–GND = 2.7V to 6V - supports ±5V input / 3V output configurations |
| Input Common Mode Range | VEE – 0.1V to VCC – 1.2V - accommodates signals extending below ground or near supply rails |
| Output Drive | Rail-to-rail VOH/VOL: +VS – 0.4V / 0.4V @ 10mA - ensures full logic swing into 50Ω loads or CMOS inputs |
| Shutdown Current | 0.1μA max - extends battery life in portable instrumentation and intermittent-sensing systems |
| Timing Jitter | 11psRMS (tPD–) / 15psRMS (tPD+) at 20MHz - meets jitter-sensitive clock clean-up and sampling requirements |
| Input Offset Voltage | 0.4–3.5mV - enables precise threshold detection with <1mV error budget in discriminators |
Pinout & Package
LT1719CS8#PBF uses an 8-lead plastic SO (SO-8) package, 1.27mm pitch, 1.75mm height, RoHS-compliant lead-free finish. Pin functions are electrically isolated between input and output stages.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VCC) | Positive input-stage supply | Bias for PNP differential pair; must be ≥2.7V above VEE and ≤10.5V total across VCC–VEE |
| 2 (+IN) | Noninverting input | High-impedance node (IB = –2.5μA typ); accepts signals within VEE–0.1V to VCC–1.2V range |
| 3 (–IN) | Inverting input | Matches +IN in bias and common-mode limits; differential input voltage tolerance up to ±7V |
| 4 (VEE) | Negative input-stage supply / substrate reference | Must be ≤ GND; sets lower bound of input common mode; clamping diodes protect against negative overdrive |
| 5 (GND) | Output-stage ground reference | Return path for +VS supply and output current; may be tied to system ground or floated for level-shifting |
| 6 (SHDN) | Active-high shutdown control | Pulled high internally via 70kΩ FET; <0.1μA quiescent draw when open; logic high disables output and inputs |
| 7 (OUT) | Comparator output | Rail-to-rail CMOS/TTL-compatible driver; capable of sourcing/sinking ±20mA continuously |
| 8 (+VS) | Positive output-stage supply | Defines VOH/VOL swing; independent of VCC/VEE; must be 2.7–6V above GND |
Key Features
| Feature | Design Value |
|---|---|
| UltraFast propagation | 4.5ns delay at 20mV overdrive - enables >200MHz toggle rates in high-speed sampling circuits |
| Separate input/output supplies | VCC/VEE and +VS/GND isolation - permits analog front-end at ±5V while driving 3V logic outputs |
| Internal hysteresis | 3.5mV typical - eliminates need for external positive feedback in noisy threshold-detection applications |
| Rail-to-rail output | +VS – 0.4V / 0.4V swing @ 10mA - ensures robust logic-level compatibility without external level shifters |
| Low-power shutdown | 0.1μA disabled current - reduces system standby power in battery-powered oscilloscopes and data loggers |
Applications
| Crystal Oscillator Circuits | Level Translators |
|---|---|
|
Use Scenario: Sustaining oscillation in 1–10MHz AT-cut crystal tanks with buffered TTL/CMOS output. IC Role / Device Role / Timing Role: High-gain, low-jitter comparator acting as Pierce oscillator amplifier with rail-to-rail output swing. Use Value: 4.5ns propagation delay and 15psRMS jitter ensure stable oscillation start-up and minimal phase noise degradation. |
Use Scenario: Converting 5V logic signals to 3V domain in mixed-supply FPGA I/O banks. IC Role / Device Role / Timing Role: Precision threshold detector translating voltage domains while preserving edge integrity. Use Value: Independent +VS and VCC rails allow 5V input sensing and 3V output drive without level-shifter ICs or resistive dividers. |
| Threshold Detectors/Discriminators | Zero-Crossing Detectors |
|
Use Scenario: Detecting signal amplitude excursions beyond programmable thresholds in medical ECG front-ends. IC Role / Device Role / Timing Role: Fast-response comparator with internal hysteresis rejecting noise-induced false triggers. Use Value: 3.5mV hysteresis and 0.4mV offset enable reliable discrimination of microvolt-level bio-signals with <1mV trip uncertainty. |
Use Scenario: Identifying AC waveform polarity transitions in motor control feedback loops. IC Role / Device Role / Timing Role: Low-delay comparator monitoring differential analog inputs referenced to system ground. Use Value: Input common mode range extending 100mV below GND allows accurate zero-crossing detection even with asymmetric signal offsets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1720CS8#PBF | Dual-channel version; identical 4.5ns delay, same SO-8 package, but shares VEE/GND pins - no separate input/output supplies | Suitable for space-constrained dual-threshold designs; not usable where independent analog/digital supply isolation is required | Select LT1720CS8#PBF only when dual comparators are needed and supply separation is unnecessary |
| ADCMP572BCPZ-REEL7 | Single 3.3V supply; 2.5ns delay; LVDS output; no shutdown; higher ICC (12mA) | Optimized for RF sampling and SERDES clock recovery; requires external level translation for CMOS interfacing | Choose ADCMP572BCPZ-REEL7 when sub-3ns timing and LVDS output are mandatory, and power efficiency is secondary |
Compared with LT1719CS8#PBF, LT1720CS8#PBF offers channel density at the cost of supply flexibility, while ADCMP572BCPZ-REEL7 trades shutdown capability and rail-to-rail CMOS output for raw speed and LVDS compatibility - making LT1719CS8#PBF the optimal choice for mixed-supply, low-power, TTL/CMOS-interfaced high-speed detection.
Availability
LT1719CS8#PBF is available at Aetrix Electronics and suitable for crystal oscillator circuits, level translators, threshold detectors, zero-crossing detectors, and high-speed sampling circuits requiring stable component supply across industrial temperature grades.
Supply support for LT1719CS8#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and industrial markets.
The LT1719 belongs to ADI's UltraFast comparator family, designed specifically for applications demanding sub-5ns propagation delay, low jitter, and flexible supply architectures in portable and high-reliability systems.
FAQ
What is the maximum operating temperature range for LT1719CS8#PBF?
The LT1719CS8#PBF is rated for 0°C to 70°C ambient operation. This commercial-grade temperature range is defined by its "C" suffix and applies to all electrical specifications unless otherwise noted in the datasheet. For extended-range alternatives, consider the LT1719IS8#PBF (–40°C to 85°C).
Can LT1719CS8#PBF operate with a single 5V supply?
Yes, LT1719CS8#PBF can operate with a single 5V supply by connecting VCC and +VS together, and tying VEE and GND together. The device maintains full functionality including rail-to-rail output and 4.5ns propagation delay, though internal hysteresis remains fixed at ~3.5mV and input common mode range becomes 0V to 3.8V.
Does LT1719CS8#PBF require external hysteresis for noise immunity?
No, LT1719CS8#PBF includes 3.5mV typical internal hysteresis, sufficient for most high-speed threshold detection tasks. External hysteresis is optional and only recommended when >5mV total hysteresis is required - implemented via resistor feedback from OUT to +IN or –IN per Figure 4 in the datasheet.
What is the absolute maximum input voltage for LT1719CS8#PBF?
The absolute maximum input voltage for LT1719CS8#PBF is limited by the ±10mA input current rating and the VEE–0.1V to VCC–1.2V common mode range. Differential input voltage must not exceed ±7V, and either input must remain within –12V to +7V relative to GND to avoid damage per Absolute Maximum Ratings.
How does the shutdown pin (Pin 6) behave on LT1719CS8#PBF?
The SHDN pin on LT1719CS8#PBF is active-high: pulling it to +VS disables the comparator, reducing supply current to ≤0.1μA. The pin features an internal 70kΩ pull-up FET, so an open circuit guarantees shutdown. Driving SHDN to +VS – 0.5V draws ~7μA, while logic-low (<0.8V) fully enables LT1719CS8#PBF.
LT1719CS8#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:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SO
LT1719CS8#PBF FAQ
1.How can I place an order for LT1719CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1719CS8#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 LT1719CS8#PBF reliable?
The price and inventory of LT1719CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1719CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1719CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1719CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1719CS8#PBF?
LT1719CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1719CS8#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 LT1719CS8#PBF?
For technical support, including LT1719CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1719CS8#PBF requirements.
6.How does Aetrix verify that LT1719CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1719CS8#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 LT1719CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1719CS8#PBF?
All LT1719CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1719CS8#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 LT1719CS8#PBF part is unused and in its original packaging.
Return procedure for LT1719CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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