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Analog Devices Inc. LT1394CS8#PBF
- Part No.:
- LT1394CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1394CS8#PBF.pdf
- Description:
- IC COMPARATOR 1 W/LATCH 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:132
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Product details
Overview
LT1394CS8#PBF from Analog Devices (formerly Linear Technology) is an ultrafast, ground-sensing comparator with complementary TTL/CMOS outputs and internal latch functionality. It delivers 7ns propagation delay, 0.8mV input offset voltage, and operates from single 5V or dual ±5V supplies. Its input common-mode range extends to the negative rail - enabling current-sense applications in switching regulators and high-speed zero-crossing detection.
For engineers reviewing the LT1394CS8#PBF datasheet, LT1394CS8#PBF pinout, LT1394CS8#PBF application, or LT1394CS8#PBF equivalent, key selection considerations include latch-enable timing (tSU = –0.4ns, tH = 2ns), differential propagation delay (≤2.2ns), output drive capability into TTL/CMOS loads, and compatibility with legacy LT1016/LT1116 footprints in SO-8 packaging.
Technical Context
The LT1394CS8#PBF employs a PNP-input differential stage with rail-to-rail input common-mode range down to V– and up to 1.5V below V+, enabling ground-sensing operation without external level-shifting. Its output stage provides active pull-up/pull-down for fast edge rates and minimal cross-conduction, supporting direct interface to TTL/CMOS logic without external buffers.
Latch control is implemented via a dedicated TTL/CMOS-compatible ENABLE pin (Pin 5), allowing data retention with 6ns latch propagation delay and no built-in hysteresis. The device remains stable under slow input transitions - eliminating minimum slew rate requirements - and maintains specified gain (≥750 V/V), offset (≤2.5mV), and supply current (≤10mA) across –40°C to 85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay (tPD) | 7ns typical at 5mV overdrive - enables sub-10ns decision timing in high-speed sampling and pulse discrimination. |
| Input Offset Voltage (VOS) | 0.8mV max - supports precision threshold detection in current-sense and V/F converter circuits. |
| Supply Range | Single 5V or dual ±5V - simplifies power architecture in mixed-signal systems and eliminates need for split supplies in many applications. |
| Input Common-Mode Range | Extends to V– and up to 3.5V on ±5V supply - allows direct sensing of signals referenced to ground or negative rails. |
| Output Type | Complementary TTL/CMOS - drives standard logic families directly without level-shifting or external inverters. |
| Latch Enable Function | Dedicated Pin 5 with –0.4ns setup and 2ns hold time - supports precise data capture synchronized to system clocks or trigger events. |
| Quiescent Current | 6mA typical - balances speed and power efficiency for battery-sensitive or thermally constrained designs. |
Pinout & Package
LT1394CS8#PBF is housed in an 8-lead plastic SO (SO-8) package with standard JEDEC MS-012AC outline, 1.27mm pitch, and 5.0mm × 6.2mm footprint. Pin 1 is V+ (positive supply), Pin 4 is V– (negative supply), Pin 6 is GND, and Pin 5 is LATCH ENABLE - a TTL/CMOS-compatible control input with no internal hysteresis.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ (Pin 1) | Positive supply input | Accepts 4.6V to 5.4V (single 5V) or up to +7V (dual supply); powers internal bias and output stages. |
| +IN (Pin 2) | Noninverting input | High-impedance PNP input; accepts voltages from V– to 3.5V on ±5V supply without phase reversal. |
| –IN (Pin 3) | Inverting input | Matches +IN characteristics; differential inputs tolerate ±12V differential voltage. |
| V– (Pin 4) | Negative supply input | Accepts –5V (dual) or 0V (single 5V); defines lower bound of input common-mode range. |
| LATCH ENABLE (Pin 5) | Asynchronous latch control | High = latch active (outputs hold state); low = transparent mode; VIH ≥ 2V, VIL ≤ 0.8V. |
| GND (Pin 6) | Ground reference | Return path for bias currents and output loads; must be low-inductance connection for stability. |
| Q OUT (Pin 7) | Noninverting logic output | TTL/CMOS-compatible; VOH ≥ 2.7V @ 1mA, VOL ≤ 0.5V @ –4mA; complements Q OUT. |
| Q OUT (Pin 8) | Inverting logic output | Active-low complement to Pin 7; enables direct connection to clocked flip-flops or enable inputs. |
Key Features
| Feature | Design Value |
|---|---|
| UltraFast 7ns propagation delay | Enables real-time response in 100+ MHz sampling circuits and adaptive line receivers without added latency. |
| Ground-sensing input architecture | Supports direct current measurement in low-side switch configurations without shunt resistor relocation. |
| Internal latch with TTL/CMOS-compatible enable | Eliminates need for external D-latches in pulse-width discriminators and digital oscilloscope trigger paths. |
| No minimum input slew rate requirement | Stable operation with slow-rising signals (e.g., thermocouple outputs or filtered sensor data) avoids false triggering. |
| Pin compatibility with LT1016/LT1116/LT1671 | Allows drop-in upgrade path in existing designs using those comparators, preserving PCB layout and BOM. |
Applications
| High-Speed Sampling Circuits | Current Sense for Switching Regulators |
|---|---|
Use Scenario: Capturing fast transient waveforms in digital storage oscilloscopes and time-domain reflectometers. IC Role / Device Role / Timing Role: Comparator core in track-and-hold or flash ADC front-ends, where 7ns delay determines maximum sampling rate. Use Value: Enables >100 MSPS sampling with deterministic timing margin due to guaranteed 7ns tPD and <2.2ns ∆tPD. |
Use Scenario: Monitoring MOSFET source current in synchronous buck converters to implement cycle-by-cycle overcurrent protection. IC Role / Device Role / Timing Role: Ground-referenced current comparator with latch, detecting fault conditions within one switching cycle. Use Value: Input common-mode range extending to V– allows direct shunt placement on low-side FET without level shifters or isolated amplifiers. |
| Zero-Crossing Detectors | Adaptive Line Receivers |
Use Scenario: Precise AC phase alignment in motor control inverters and solid-state relay timing. IC Role / Device Role / Timing Role: Fast, low-offset comparator with Schottky-clamped inputs to minimize dead-time uncertainty. Use Value: 0.8mV VOS and 7ns tPD reduce zero-crossing jitter to <100ps, improving PWM synchronization accuracy. |
Use Scenario: Recovering digital data from attenuated or DC-drifted signals in fiber-optic transceivers and RS-485 links. IC Role / Device Role / Timing Role: Adaptive threshold generator feeding a high-speed comparator stage for amplitude-independent triggering. Use Value: Stable operation across –40°C to 85°C and insensitivity to input slew rate allow reliable detection from 100Hz to 45MHz without 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 |
|---|---|---|---|
| LT1719CS8#PBF | 2.7ns propagation delay, 1.5mV offset, no internal latch, requires external pull-up resistors for open-collector outputs. | Better suited for ultra-low-latency window comparators but lacks latch for data retention. | Select when <3ns timing is critical and latch functionality is implemented externally. |
| MAX961ESA+ | 4.5ns propagation delay, 1.2mV offset, rail-to-rail inputs, no latch, designed for single 2.7V–5.5V supply only. | Optimized for low-voltage portable systems; incompatible with dual-supply operation or ±5V legacy designs. | Choose for battery-powered instrumentation requiring sub-5ns response and single-supply simplicity. |
Compared with LT1719CS8#PBF and MAX961ESA+, the LT1394CS8#PBF uniquely combines 7ns speed, internal latch, ground-sensing input, and dual/single supply flexibility - making it the only option among the three that supports latched current-sense protection in industrial SMPS without redesigning the signal path or power architecture.
Availability
LT1394CS8#PBF is available at Aetrix Electronics and suitable for high-speed sampling circuits, current-sense protection in switching regulators, zero-crossing detection, and adaptive line receivers requiring stable component supply across extended temperature ranges.
Supply support for LT1394CS8#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 technologies, formed through the acquisition of Linear Technology in 2017.
The LT1394CS8#PBF belongs to ADI's legacy Linear Technology high-speed comparator product line, engineered specifically for precision timing-critical applications including test equipment, power management, and communications infrastructure where speed, latch capability, and rail-sensing accuracy are jointly required.
FAQ
What is the operating temperature range for LT1394CS8#PBF?
The LT1394CS8#PBF is specified for operation from –40°C to 85°C. While the commercial-grade CS8 variant is tested and guaranteed from 0°C to 70°C, it is characterized and designed to meet full extended-range performance across –40°C to 85°C - consistent with its absolute maximum junction temperature rating of 150°C and thermal resistance θJA = 190°C/W in SO-8 packaging. This makes LT1394CS8#PBF suitable for industrial environments where ambient extremes occur.
Does LT1394CS8#PBF require external pull-up resistors on its outputs?
No, LT1394CS8#PBF does not require external pull-up resistors. Its Q OUT and Q OUT pins feature active push-pull TTL/CMOS-compatible outputs capable of sourcing ≥1mA and sinking ≥4mA while maintaining VOH ≥ 2.7V and VOL ≤ 0.5V. This eliminates external components needed by open-collector comparators like the LT1719, simplifying board layout and reducing signal path capacitance in high-speed applications.
Can LT1394CS8#PBF operate from a single 3.3V supply?
No, LT1394CS8#PBF is not rated for reliable operation on a single 3.3V supply. Its absolute maximum positive supply voltage is 7V, but its electrical specifications - including propagation delay, output swing, and input common-mode range - are guaranteed only for single 5V (V+ = 5V, V– = 0V) or dual ±5V (V+ = +5V, V– = –5V) operation. Using 3.3V risks degraded tPD, reduced VOH, and undefined latch behavior, as confirmed by the datasheet's test conditions and supply voltage derating curves.
How does the latch function behave during power-up of LT1394CS8#PBF?
During power-up, the LATCH ENABLE pin (Pin 5) of LT1394CS8#PBF floats high by default, placing the device in latched mode until actively driven low. This ensures outputs retain a known state (not oscillating) during supply stabilization. To achieve transparent operation at startup, the host system must assert a logic low on Pin 5 after V+ and V– reach regulation - typically via a reset controller or GPIO. The latch hold time (tH = 2ns) and setup time (tSU = –0.4ns) remain valid once supplies are stable.
Is LT1394CS8#PBF pin-compatible with LT1016CN8#PBF?
Yes, LT1394CS8#PBF is pin-compatible with LT1016CN8#PBF in the 8-lead SO package. Both share identical pin assignments: V+ (1), +IN (2), –IN (3), V– (4), LATCH/STROBE (5), GND (6), Q OUT (7), and Q OUT (8). However, LT1394CS8#PBF replaces the LT1016's strobe-only function with full latch enable capability and improves propagation delay from 10ns to 7ns - enabling direct replacement in most LT1016-based designs without layout changes.
LT1394CS8#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:
- 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-SO
LT1394CS8#PBF FAQ
1.How can I place an order for LT1394CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1394CS8#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 LT1394CS8#PBF reliable?
The price and inventory of LT1394CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1394CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1394CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1394CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1394CS8#PBF?
LT1394CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1394CS8#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 LT1394CS8#PBF?
For technical support, including LT1394CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1394CS8#PBF requirements.
6.How does Aetrix verify that LT1394CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1394CS8#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 LT1394CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1394CS8#PBF?
All LT1394CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1394CS8#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 LT1394CS8#PBF part is unused and in its original packaging.
Return procedure for LT1394CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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