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Analog Devices Inc. LT1394CMS8#PBF
- Part No.:
- LT1394CMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1394CMS8#PBF.pdf
- Description:
- IC COMPARATOR 1 W/LATCH 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:800
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Product details
Overview
LT1394CMS8#PBF from Analog Devices (formerly Linear Technology) is an UltraFast 7ns ground-sensing comparator with complementary TTL/CMOS outputs and internal latch, operating from single 5V or dual ±5V supplies. It features 0.8mV input offset voltage, 6mA supply current, and input common-mode range extending to the negative rail - enabling precision current sensing in switching regulators and high-speed zero-crossing detection in line receivers.
For engineers reviewing the LT1394CMS8#PBF datasheet, LT1394CMS8#PBF pinout, LT1394CMS8#PBF application, or LT1394CMS8#PBF equivalent, this page delivers verified specifications, validated MSOP-8 pin functions, real-world timing-critical use cases (e.g., adaptive triggers, pulse discriminators), and two confirmed alternative comparators with documented functional and packaging differences.
Technical Context
The LT1394CMS8#PBF uses a PNP differential input stage enabling rail-to-rail negative common-mode operation down to V–, with no minimum input slew rate requirement. Its output stage provides active drive in both directions for fast edge rates into TTL, CMOS, or passive loads while minimizing cross-conduction current.
An internal TTL/CMOS-compatible latch retains output states when the LATCH ENABLE pin is high; latch propagation delay is 6ns, setup time is –0.4ns, and hold time is 2ns. Device gain (750–1600 V/V), offset (0.8mV typ), and PSRR (50–100 dB) remain stable across –40°C to 85°C and supply variations (V+ = 4.6–5.4V, V– = –7 to –2V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 7ns typical at 5mV overdrive - enables sub-10ns decision timing in A/D front-ends and sampling circuits. |
| Input Offset Voltage | 0.8mV max - supports precision threshold detection in current-sense and V/F converter applications. |
| Supply Current | 6mA positive supply current - balances speed and power efficiency for battery-sensitive or thermally constrained designs. |
| Input Common-Mode Range | Extends to V– rail and up to 1.5V below V+ - allows direct ground-referenced signal monitoring without level-shifting. |
| Output Type | Complementary TTL/CMOS outputs - interfaces directly to logic without external pull-ups or level translators. |
| Latch Function | Internal enable-controlled latch with 6ns propagation delay - eliminates need for external flip-flops in gated sampling or strobe-hold systems. |
| Package | 8-lead MSOP (3mm × 3mm) - provides compact footprint for high-density PCB layouts while maintaining thermal performance (θJA = 250°C/W). |
Pinout & Package
LT1394CMS8#PBF is housed in an 8-lead MSOP package (3mm × 3mm, 0.65mm pitch) with exposed pad for thermal enhancement. Pin 6 is GND; pins 1 and 4 are V+ and V– respectively; pins 2 and 3 are +IN and –IN; pins 5, 7, and 8 are LATCH ENABLE, Q OUT, and Q OUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ (Pin 1) | Positive supply input | Accepts 4.6–5.4V (single 5V) or up to +7V (dual supply); powers internal bias and output drivers. |
| +IN (Pin 2) | Noninverting input | High-impedance PNP input; accepts signals down to V– rail without phase reversal or damage. |
| –IN (Pin 3) | Inverting input | Matches +IN characteristics; differential input voltage rated to ±12V. |
| V– (Pin 4) | Negative supply input | Accepts –7V to 0V; defines lower common-mode limit and enables true ground-sensing operation. |
| LATCH ENABLE (Pin 5) | Active-high latch control | When high, freezes Q OUT/Q OUT states; floats high when unconnected - requires grounding for flow-through mode. |
| GND (Pin 6) | Ground reference | Signal and power return path; must be low-inductance connection for stable high-speed operation. |
| Q OUT (Pin 7) | Noninverting logic output | TTL/CMOS-compatible; sinks 10mA or sources 4mA; VOH = 2.4–3.1V, VOL = 0.3–0.5V. |
| Q OUT (Pin 8) | Inverting logic output | Complementary to Pin 7; enables direct interface to differential logic or latched bus architectures. |
Key Features
| Feature | Design Value |
|---|---|
| UltraFast 7ns propagation delay | Enables >100MHz sampling in high-speed ADC drivers and pulse-width discriminators without added latency. |
| Ground-sensing input stage | Operates with inputs at or below GND (V– = 0V), eliminating need for negative rails in current-sense amplifier feedback paths. |
| No minimum input slew rate | Stable response to slow-moving or DC-biased signals - critical for zero-crossing detectors and extended-range V/F converters. |
| Input overvoltage tolerance | Inputs tolerate voltages exceeding V+ by ≤12V (via internal diodes), supporting robust interfacing to unregulated or noisy sensor outputs. |
| Pin compatibility with LT1016/LT1116/LT1671 | Allows drop-in replacement in legacy designs using those comparators - same pinout, function, and output drive capability. |
Applications
| Current Sense for Switching Regulators | High-Speed Sampling Circuits |
|---|---|
Use Scenario: Monitoring MOSFET source current in synchronous buck converters to trigger cycle-by-cycle overcurrent protection. IC Role / Device Role / Timing Role: Ground-sensing comparator compares shunt voltage against reference; 7ns delay ensures fault detection within one switching cycle at 10MHz. Use Value: Enables <100ns response to current faults, improving system reliability without adding external amplifiers or level shifters. |
Use Scenario: Capturing transient events in oscilloscope front-ends or digital storage scopes requiring precise time-stamping of analog edges. IC Role / Device Role / Timing Role: Comparator acts as high-speed trigger with latch holding sampled state until readout; complementary outputs drive SR latches directly. Use Value: Eliminates external latch ICs and reduces jitter-induced timing uncertainty by integrating decision and hold functions in one device. |
| Zero-Crossing Detectors | Adaptive Line Receivers |
Use Scenario: Detecting AC line zero crossings in solid-state relays and TRIAC dimmers operating from 50/60Hz mains with ±10% voltage variation. IC Role / Device Role / Timing Role: Comparator monitors transformer-coupled line signal; input common-mode range accommodates full-wave rectified offsets without clamping. Use Value: Achieves <1µs timing accuracy across temperature and supply variations, reducing harmonic distortion in phase-controlled loads. |
Use Scenario: Recovering clock/data from variable-amplitude fiber-optic or coaxial receiver outputs (2mV–175mV, 100Hz–45MHz). IC Role / Device Role / Timing Role: Adaptive trigger core - LT1394CMS8#PBF compares AC-coupled signal against dynamically adjusted threshold generated by peak detector. Use Value: Maintains consistent triggering across amplitude drift and DC offset shifts, enabling reliable data recovery without manual recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1016CS8#PBF | Slower 10ns propagation delay; no internal latch; 15mA supply current; same MSOP-8 pinout. | Lacks latch functionality - requires external flip-flop for sampled-data systems; higher power limits battery-operated use. | Select when latch is unnecessary and cost sensitivity outweighs 3ns speed penalty and 9mA power savings. |
| MAX961ASA+ | 8ns propagation delay; rail-to-rail inputs; 3.5mA supply current; SO-8 package only (not MSOP-8). | SO-8 footprint increases board area vs. MSOP-8; rail-to-rail input extends upper common-mode but lacks ground-sensing below GND. | Select when ultra-low power (3.5mA) is critical and SO-8 layout is acceptable; avoid where ground-referenced negative inputs are required. |
Compared with LT1394CMS8#PBF, LT1016CS8#PBF trades 3ns speed and 9mA power for latch omission and legacy compatibility, while MAX961ASA+ offers lower power and rail-to-rail input range but sacrifices ground-sensing capability and forces SO-8 layout - making LT1394CMS8#PBF optimal for compact, latch-dependent, ground-referenced high-speed detection.
Availability
LT1394CMS8#PBF is available at Aetrix Electronics and suitable for high-speed sampling circuits, switching regulator current sense, zero-crossing detection, and adaptive line receivers requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LT1394CMS8#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. (including former Linear Technology products) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for precision and high-speed applications.
The LT1394CMS8#PBF belongs to Linear Technology's UltraFast comparator family, designed specifically for timing-critical systems demanding sub-10ns decision latency, latch retention, and robust operation across single/dual supplies without external support components.
FAQ
What is the maximum operating temperature range for the LT1394CMS8#PBF?
The LT1394CMS8#PBF is specified for operation from –40°C to 85°C. While not fully tested across that range, it is designed and characterized to meet all electrical specifications within these limits - unlike the industrial-grade LT1394IS8, which is guaranteed over the full range. Thermal derating is recommended above 70°C ambient.
Can the LT1394CMS8#PBF operate from a single 3.3V supply?
No - the LT1394CMS8#PBF requires a minimum total supply voltage of 4.6V (V+ to V–) and is specified only for single 5V (V+ = 5V, V– = 0V) or dual ±5V (V+ = +5V, V– = –5V) operation. Operation at 3.3V violates absolute maximum ratings and will result in undefined output behavior and potential damage.
Does the LT1394CMS8#PBF require external bypass capacitors?
Yes - stable high-speed operation of the LT1394CMS8#PBF requires local bypassing: a 0.1µF ceramic capacitor placed as close as possible to pins 1 (V+) and 4 (V–), plus a 4.7µF tantalum capacitor nearby. Omitting bypassing causes supply rail bounce, increased propagation delay variation, and potential oscillation at the outputs.
Is the LT1394CMS8#PBF pin-compatible with the LT1394CS8#PBF?
Yes - both LT1394CMS8#PBF (MSOP-8) and LT1394CS8#PBF (SO-8) share identical pin numbering, pin functions, and electrical specifications. The only difference is package type: MSOP-8 offers 3mm × 3mm footprint and 250°C/W thermal resistance, while SO-8 is larger (5mm × 6mm) with 190°C/W θJA.
What is the purpose of the LATCH ENABLE pin on the LT1394CMS8#PBF?
The LATCH ENABLE pin (Pin 5) controls the internal latch: when driven high, it freezes the Q OUT and Q OUT output states regardless of subsequent input changes; when low, outputs respond immediately to input transitions. The latch holds data for as long as the pin remains high, with 6ns propagation delay when released - enabling precise gated sampling in test equipment and data acquisition systems.
LT1394CMS8#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, TTL
- Voltage - Supply, Single/Dual (±):
- -
- :
- 2.5mV @ ±5V
- Voltage - Input Offset (Max):
- 4.5µA @ ±5V
- Current - Input Bias (Max):
- 20mA
- Current - Output (Typ):
- 8.5mA
- Current - Quiescent (Max):
- 100dB CMRR, 100dB PSRR
- CMRR, PSRR (Typ):
- 9ns
- Propagation Delay (Max):
- -
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-MSOP
LT1394CMS8#PBF FAQ
1.How can I place an order for LT1394CMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1394CMS8#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 LT1394CMS8#PBF reliable?
The price and inventory of LT1394CMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1394CMS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1394CMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1394CMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1394CMS8#PBF?
LT1394CMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1394CMS8#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 LT1394CMS8#PBF?
For technical support, including LT1394CMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1394CMS8#PBF requirements.
6.How does Aetrix verify that LT1394CMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1394CMS8#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 LT1394CMS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1394CMS8#PBF?
All LT1394CMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1394CMS8#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 LT1394CMS8#PBF part is unused and in its original packaging.
Return procedure for LT1394CMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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