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Texas Instruments SN74LVTH374NSR
- Part No.:
- SN74LVTH374NSR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVTH374NSR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,699
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Product details
Overview
SN74LVTH374NSR from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with 3-state outputs, designed for 3.3-V VCC operation while supporting 5-V TTL-level inputs and outputs. It features bus-hold circuitry on data inputs, Ioff and power-up 3-state for hot insertion, and operates from 2.7 V to 3.6 V. It is used in mixed-voltage bus interface applications such as memory address latching and data buffering between 3.3-V logic and legacy 5-V systems.
For engineers reviewing the SN74LVTH374NSR datasheet, SN74LVTH374NSR pinout, SN74LVTH374NSR application, or SN74LVTH374NSR equivalent, key selection considerations include its 20-pin SOP (NS) package, 150-MHz maximum clock frequency, ±64-mA output drive capability, bus-hold input retention, and support for unregulated battery supply down to 2.7 V.
Technical Context
This device implements eight independent edge-triggered D flip-flops with a common clock (CLK) and buffered output-enable (OE) control. Each flip-flop captures the D-input state on the rising edge of CLK and presents it at Q, while OE independently places all eight Q outputs into high-impedance without affecting internal latch states.
The SN74LVTH374NSR integrates active bus-hold circuitry on all eight D inputs-eliminating external pullup/pulldown resistors-and supports hot-insertion via Ioff (≤±100 µA at VCC = 0) and power-up 3-state behavior that forces outputs high-Z during VCC ramp from 0 to 1.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports unregulated battery rails and low-power 3.3-V systems |
| Max Clock Frequency | 150 MHz - enables high-speed data capture in memory and bus interface designs |
| Output Drive (IOL/IOH) | 64 mA sink / 32 mA source - drives heavy capacitive loads and standard TTL buses directly |
| Input Voltage Tolerance | Up to 5.5 V on all inputs - allows direct connection to 5-V logic without level shifters |
| Bus-Hold Current | ±750 µA max (dynamic) - maintains valid logic states on floating D inputs without external resistors |
| Propagation Delay (tPLH/tPHL) | 1.8 ns to 4.5 ns (VCC = 3.3 V) - ensures tight timing margins in synchronous bus architectures |
| Power-Up 3-State Threshold | Active below 1.5 V VCC - prevents bus contention during power sequencing |
Pinout & Package
The SN74LVTH374NSR is housed in a 20-pin SOP (Small Outline Package) with 0.65-mm lead pitch, 7.4-mm body width, and 2.0-mm maximum height per JEDEC MO-150. Pin 1 is located at the top-left corner with a beveled edge marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low control: asserts high-impedance on all Q outputs when high; no effect on internal flip-flop operation |
| 2–9 | D1–D8 (Data Inputs) | Asynchronous inputs with integrated bus-hold - retain last valid logic state when un-driven |
| 10 | GND | Ground reference for all internal circuitry and output drivers |
| 11 | VCC | 3.3-V supply input; powers internal logic and output buffers; tolerant of 2.7–3.6 V range |
| 12–19 | Q1–Q8 (Outputs) | 3-state, TTL-compatible outputs with ±64-mA sink/source capability and 7-pF typical output capacitance |
| 20 | CLK | Positive-edge-triggered clock input; synchronizes D-to-Q transfer; accepts 5-V-tolerant signals |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 5-V-tolerant inputs/outputs with 3.3-V VCC - eliminates level-shifter ICs in 3.3/5-V interconnects |
| Bus-hold on all D inputs | Eliminates need for external pullup/pulldown resistors - reduces BOM count and PCB area |
| Ioff and power-up 3-state | Prevents backflow current and bus contention during hot insertion or power cycling - critical for modular backplanes |
| Low ground bounce (VOLP) | <0.8 V at VCC = 3.3 V - minimizes noise coupling into shared ground planes |
| Latch-up immunity | >500 mA per JESD 17 - ensures robustness in noisy industrial environments |
Applications
| Memory Address Latching | Industrial Bus Interface |
|---|---|
|
Use Scenario: Holding microcontroller address bus signals during memory read/write cycles in embedded controllers. IC Role / Device Role / Timing Role: Edge-triggered latch capturing stable address bits on CLK rise; OE enables/disables bus drive during data phase. Use Value: Eliminates external glue logic and reduces timing uncertainty with sub-5-ns propagation delay and 150-MHz clock support. |
Use Scenario: Interfacing a 3.3-V FPGA I/O bank to a legacy 5-V parallel sensor bus in factory automation equipment. IC Role / Device Role / Timing Role: Level-translating octal latch with 5-V-tolerant inputs and 3.3-V-compatible outputs; bus-hold retains address state during FPGA reconfiguration. Use Value: Removes need for discrete level shifters and pull resistors, simplifying layout and improving signal integrity across mixed-voltage domains. |
| Hot-Swappable Module Control | Test Equipment Data Capture |
|
Use Scenario: Enabling safe insertion/removal of daughter cards in telecom line cards with live backplane power. IC Role / Device Role / Timing Role: Output-isolation latch using Ioff and power-up 3-state to prevent backfeeding and bus conflicts during card insertion. Use Value: Guarantees zero-current backflow and automatic high-Z during VCC ramp - meets Telcordia GR-63-CORE hot-swap requirements. |
Use Scenario: Capturing parallel digital waveform samples from high-speed ADCs in automated test equipment (ATE). IC Role / Device Role / Timing Role: Synchronized sampling latch triggered by system clock; 64-mA drive strength sustains signal integrity across long PCB traces to FPGA capture logic. Use Value: Enables reliable 150-MHz sampling without external drivers or termination networks due to strong output sourcing/sinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC374APWR | Lower drive (24 mA), no bus-hold, 1.65–3.6 V VCC, no 5-V tolerance | Suitable only for pure 3.3-V or lower systems; requires external pull resistors | Select when cost and power are prioritized over mixed-voltage compatibility and bus-hold |
| SN74LVCH16374ADGGR | 16-bit, dual-rail (1.65–3.6 V), no 5-V tolerance, higher pin count (48-pin TSSOP) | Designed for wide-bus applications; lacks 5-V input compatibility and bus-hold | Choose for high-density 16-bit latching where board space permits larger package and voltage domain is uniform |
Compared with SN74LVC374APWR and SN74LVCH16374ADGGR, the SN74LVTH374NSR uniquely combines 5-V-tolerant inputs, integrated bus-hold, and hot-insertion support in a compact 20-pin SOP - making it the only option among the three qualified for legacy 5-V bus interfacing without external components.
Availability
SN74LVTH374NSR is available at Aetrix Electronics and suitable for industrial bus interface, memory address latching, hot-swappable module control, and test equipment data capture requiring stable component supply and long-term production continuity.
Supply support for SN74LVTH374NSR 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of expertise in high-reliability interface and timing products.
The SN74LVTH374NSR belongs to TI's LVTH logic family, engineered for robust mixed-voltage system integration - specifically targeting applications where 3.3-V logic must interoperate with legacy 5-V infrastructure without external level-shifting components.
FAQ
What is the operating voltage range for the SN74LVTH374NSR?
The SN74LVTH374NSR operates from 2.7 V to 3.6 V on VCC. Its inputs tolerate up to 5.5 V, enabling direct connection to 5-V logic families without level shifters. This dual-voltage capability is intrinsic to the LVTH process and is verified across the full −40°C to 85°C temperature range specified for the SN74LVTH374NSR.
Does the SN74LVTH374NSR require external pullup or pulldown resistors on its D inputs?
No. The SN74LVTH374NSR includes active bus-hold circuitry on all eight D inputs, which maintains the last valid logic state when inputs are floating or undriven. Using external pull resistors with the SN74LVTH374NSR is not recommended, as it may interfere with bus-hold functionality and increase power consumption unnecessarily.
How does the SN74LVTH374NSR support hot insertion?
The SN74LVTH374NSR supports hot insertion through two complementary features: Ioff circuitry limits current to ±100 µA when VCC = 0, preventing damaging backflow; and power-up 3-state forces all outputs into high-impedance while VCC ramps from 0 to 1.5 V - both confirmed in the SN74LVTH374NSR datasheet absolute maximum and recommended operating conditions tables.
What package type and dimensions does the SN74LVTH374NSR use?
The SN74LVTH374NSR uses a 20-pin SOP (Small Outline Package) with JEDEC MO-150 registration, 0.65-mm lead pitch, 7.4-mm body width, and 2.0-mm maximum height. Pin 1 is marked by a beveled edge, and the package is RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating for unlimited floor life at 260°C peak reflow.
Can the SN74LVTH374NSR drive standard TTL loads directly?
Yes. The SN74LVTH374NSR provides ±64-mA output drive capability (IOL = 64 mA, IOH = 32 mA), exceeding standard TTL fan-out requirements. Its VOH ≥ 2.0 V and VOL ≤ 0.55 V at rated load ensure reliable logic-level compliance with 5-V TTL inputs, validated across the full operating temperature and voltage range for the SN74LVTH374NSR.
SN74LVTH374NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 150 MHz
- Max Propagation Delay @ V, Max CL:
- 4.5ns @ 3.3V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Current - Quiescent (Iq):
- 190 µA
- Input Capacitance:
- 3 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74LVTH374NSR FAQ
1.How can I place an order for SN74LVTH374NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH374NSR 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 SN74LVTH374NSR reliable?
The price and inventory of SN74LVTH374NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH374NSR is usually 5 days.
3.What payment methods are accepted for SN74LVTH374NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTH374NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVTH374NSR?
SN74LVTH374NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH374NSR 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 SN74LVTH374NSR?
For technical support, including SN74LVTH374NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH374NSR requirements.
6.How does Aetrix verify that SN74LVTH374NSR is sourced from the original manufacturer or authorized distributors?
All SN74LVTH374NSR 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 SN74LVTH374NSR meets industry standards.
7.What is the process for return or replacement of SN74LVTH374NSR?
All SN74LVTH374NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH374NSR, 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 SN74LVTH374NSR part is unused and in its original packaging.
Return procedure for SN74LVTH374NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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