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Texas Instruments SN74LS374NSRG4
- Part No.:
- SN74LS374NSRG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LS374NSRG4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,788
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Product details
Overview
SN74LS374NSRG4 from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with 3-state bus-driving outputs, designed for synchronous data latching in TTL-compatible digital systems. It features independent output-enable (OC) control, buffered clock input, and operates at VCC = 4.75–5.25 V with tPLH/tPHL ≤ 28 ns and fmax = 35 MHz under standard load conditions. It is used in address/data bus buffering, I/O port expansion, and register file implementation in legacy industrial controllers and embedded instrumentation.
For engineers reviewing the SN74LS374NSRG4 datasheet, SN74LS374NSRG4 pinout, SN74LS374NSRG4 application, or SN74LS374NSRG4 equivalent, key selection criteria include its edge-triggered storage behavior, 3-state output drive capability (±24 mA), OC-controlled bus isolation, and compatibility with 5-V TTL logic families in space-constrained SOP-20 layouts.
Technical Context
The SN74LS374NSRG4 implements eight independent D-type flip-flops synchronized to the rising edge of CLK, with each Q output capturing the logic state present at its corresponding D input at clock transition. Its output-enable (OC) terminal operates asynchronously and places all eight outputs in high-impedance state without affecting internal latch states.
It uses standard TTL input thresholds (VIH = 2.0 V min, VIL = 0.8 V max), supports full parallel loading, and maintains data integrity during output disable via internal retention-enabling seamless bus arbitration in multi-master systems without external hold circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.75 V to 5.25 V - Ensures stable operation within commercial-grade 5-V TTL supply tolerance. |
| fmax | 35 MHz - Maximum reliable clock frequency under RL = 667 Ω / CL = 45 pF load, suitable for medium-speed bus interfaces. |
| tPLH / tPHL | ≤ 28 ns - Propagation delay from CLK to Q ensures timing predictability in synchronous pipelines. |
| IOL / IOH | 24 mA / –2.6 mA - Sustained low/high output drive enables direct connection to capacitive or resistive bus loads without buffers. |
| tsu / th (CLK) | 20 ns setup / 5 ns hold - Defines minimum D-input stability window before/after CLK edge for reliable sampling. |
| IOZH / IOZL | ±20 µA - Low off-state leakage preserves bus signal integrity when outputs are disabled. |
| ICC (active) | 27–40 mA - Supply current range reflects dynamic switching activity; critical for power budgeting in dense logic designs. |
Pinout & Package
SOP-20 (Small Outline Package, 20-pin) with gull-wing leads, 0.65 mm pitch, JEDEC MS-013AC compliant. Body dimensions: 12.8 mm × 7.5 mm × 2.65 mm (max height).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OC) | Output Control | Active-low enable: drives all Q outputs to high-Z when high; no effect on internal flip-flop state. |
| 2–9 (D1–D8) | Data Inputs | Asynchronous inputs sampled on rising CLK edge; TTL-compatible voltage thresholds. |
| 10 (GND) | Ground Reference | Signal and power return path; must be low-inductance for noise immunity. |
| 11–18 (Q1–Q8) | 3-State Outputs | Edge-triggered registered outputs; driven high/low or placed in high-Z per OC state. |
| 19 (VCC) | Supply Voltage | +5 V nominal power rail; decoupling capacitor required near pin for transient suppression. |
| 20 (CLK) | Clock Input | Rising-edge sensitive; Schmitt-trigger not present (unlike 'S374 variants); requires clean, monotonic transitions. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-triggered storage | Positive-edge CLK sampling eliminates transparency window, enabling deterministic timing in pipelined architectures. |
| Independent 3-state control | Single OC pin disables all eight outputs simultaneously without disrupting internal data retention. |
| Bus-compatible drive strength | 24 mA sink / 2.6 mA source capability allows direct interfacing with standard TTL/CMOS buses up to 15 pF load. |
| Full parallel access | All eight D inputs and Q outputs accessible concurrently-ideal for byte-wide data paths and register files. |
| TTL input compatibility | Standard VIH/VIL thresholds (2.0 V / 0.8 V) ensure interoperability with legacy 74LS, 74F, and 74ALS logic families. |
Applications
| Microprocessor Address Latching | Industrial I/O Port Expansion |
|---|---|
|
Use Scenario: Holding microprocessor address bus signals during memory or peripheral access cycles where address must remain stable while data transfers occur. IC Role / Device Role / Timing Role: Edge-triggered latch capturing A0–A7 on rising CLK (tied to CPU ALE or similar strobe), holding values until next cycle. Use Value: Eliminates need for external glue logic or dual-latch schemes; enables clean separation of address and data phases in 8-bit bus systems. |
Use Scenario: Expanding GPIO count on PLC or CNC controller boards by adding bidirectional data registers accessible via shared system bus. IC Role / Device Role / Timing Role: Byte-wide I/O register with OC-controlled bus isolation, allowing multiple peripherals to share same data lines without contention. Use Value: Reduces PCB routing complexity and component count versus discrete buffer solutions; supports hot-swap-safe peripheral addressing via OC sequencing. |
| Legacy Bus Buffering | Register File Implementation |
|
Use Scenario: Isolating and driving a shared data bus between CPU and multiple memory-mapped peripherals in retro-computing or test equipment. IC Role / Device Role / Timing Role: Bidirectional bus driver using OC for direction control and CLK for synchronized data capture from bus. Use Value: Provides noise-immune, high-drive bus interface with precise timing alignment-critical for reliable operation at 35 MHz bus rates. |
Use Scenario: Constructing a 4×8-bit general-purpose register file in educational or prototyping FPGA companion boards. IC Role / Device Role / Timing Role: One SN74LS374NSRG4 per register byte; CLK driven by common register-select decoder output. Use Value: Enables compact, low-power, fully synchronous register bank with no external clock gating or reset logic required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS374N | Same logic function and electrical specs; PDIP-20 package instead of SOP-20. | Preferred for through-hole prototyping or legacy board rework where surface-mount is impractical. | Select SN74LS374N for hand-soldered development or repair; SN74LS374NSRG4 for automated assembly and space-constrained layouts. |
| SN74LS374DWR | Identical functionality and SOP-20 package; differs only in tape-and-reel packaging (2000 pcs/reel vs. NSRG4's unspecified quantity). | No functional difference; choice depends solely on procurement channel and volume requirements. | Choose SN74LS374DWR for high-volume production with pick-and-place feeders; SN74LS374NSRG4 for smaller-batch or mixed-SMT builds. |
Compared with SN74LS374N and SN74LS374DWR, the SN74LS374NSRG4 offers identical timing, drive, and logic behavior in a RoHS-compliant SOP-20 package with NIPDAU lead finish and Level-1 moisture sensitivity-making it optimal for modern automated manufacturing while maintaining full drop-in compatibility with legacy designs.
Availability
SN74LS374NSRG4 is available at Aetrix Electronics and suitable for industrial control systems, legacy instrumentation upgrades, and embedded microprocessor support circuits requiring stable component supply across extended product lifecycles.
Supply support for SN74LS374NSRG4 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 founded in 1930, specializing in analog, embedded processing, and logic ICs with deep heritage in TTL and bipolar logic families.
The SN74LS374NSRG4 belongs to TI's legacy 74LS logic series-designed for robust, low-power, pin-compatible replacement of earlier 74-series devices in industrial, military, and computing applications demanding proven reliability and long-term availability.
FAQ
What is the primary function of the SN74LS374NSRG4?
The SN74LS374NSRG4 is an octal positive-edge-triggered D-type flip-flop with 3-state outputs. It captures and holds eight bits of data on the rising edge of its CLK input, and its OC pin independently controls whether the Q outputs drive the bus or enter high-impedance state-making it ideal for synchronous bus interfacing and register applications.
Does the SN74LS374NSRG4 have Schmitt-trigger inputs?
No, the SN74LS374NSRG4 does not feature Schmitt-trigger inputs on CLK or OC. Unlike the 'S374 variants, its inputs follow standard TTL thresholds (VIH = 2.0 V min, VIL = 0.8 V max) without hysteresis-requiring clean, monotonic clock and control signals to avoid metastability or false triggering.
Can the SN74LS374NSRG4 be used as a transparent latch?
No-the SN74LS374NSRG4 is strictly an edge-triggered flip-flop. For transparent latching behavior, use the SN74LS373 family. The SN74LS374NSRG4 samples D inputs only on the rising CLK edge and holds the value until the next clock event; it does not pass through data while CLK is high.
What is the maximum clock frequency supported by the SN74LS374NSRG4?
The SN74LS374NSRG4 supports a maximum clock frequency of 35 MHz under standard test conditions (RL = 667 Ω, CL = 45 pF, VCC = 5 V, TA = 25°C). At higher temperatures or heavier loads, derating is required-consult TI's SDLS165B datasheet for full AC characteristics.
Is the SN74LS374NSRG4 RoHS compliant?
Yes, the SN74LS374NSRG4 is RoHS compliant, featuring NiPdAu (NIPDAU) lead finish and meeting JEDEC J-STD-020 moisture sensitivity Level-1 (260°C peak reflow). Its SOP-20 package is rated for 0°C to 70°C operation and qualified for commercial-grade production use.
SN74LS374NSRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 50 MHz
- Max Propagation Delay @ V, Max CL:
- 28ns @ 5V, 45pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 2.6mA, 24mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Current - Quiescent (Iq):
- 40 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74LS374NSRG4 FAQ
1.How can I place an order for SN74LS374NSRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS374NSRG4 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 SN74LS374NSRG4 reliable?
The price and inventory of SN74LS374NSRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS374NSRG4 is usually 5 days.
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SN74LS374NSRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS374NSRG4 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 SN74LS374NSRG4?
For technical support, including SN74LS374NSRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS374NSRG4 requirements.
6.How does Aetrix verify that SN74LS374NSRG4 is sourced from the original manufacturer or authorized distributors?
All SN74LS374NSRG4 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 SN74LS374NSRG4 meets industry standards.
7.What is the process for return or replacement of SN74LS374NSRG4?
All SN74LS374NSRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS374NSRG4, 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 SN74LS374NSRG4 part is unused and in its original packaging.
Return procedure for SN74LS374NSRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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