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Texas Instruments SN74AS374DWR
- Part No.:
- SN74AS374DWR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AS374DWR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:8,000
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Product details
Overview
SN74AS374DWR from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state outputs, designed for high-speed bus interfacing in digital systems. It operates at up to 125 MHz clock frequency, delivers ±48 mA output drive, and features independent output-enable control for bidirectional bus management in industrial control and data acquisition systems.
For engineers reviewing the SN74AS374DWR datasheet, SN74AS374DWR pinout, SN74AS374DWR application, or SN74AS374DWR equivalent, this page provides verified timing parameters (tPLH = 3 ns, tPHL = 4 ns), absolute maximum ratings (VCC = –0.5 V to 7 V), thermal impedance (θJA = 58°C/W), and confirmed SOIC-20 DW package compatibility.
Technical Context
This device implements eight independent D-type latches triggered on the positive clock edge, with asynchronous 3-state output control via OE. Internal buffering isolates OE and CLK inputs from bus loading effects while preserving setup/hold timing integrity (tsu = 2 ns, th = 2 ns).
Each channel supports true logic-level outputs (no inversion), retains state during OE assertion, and drives capacitive loads without external pull-ups. The architecture enables parallel data capture and controlled bus release-critical for register file expansion and bidirectional data exchange circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | AS (Advanced Schottky) - enables 125 MHz operation with low propagation delay |
| Max Clock Frequency | 125 MHz - supports high-throughput data sampling in real-time I/O subsystems |
| Output Drive Strength | IOL = 48 mA / IOH = –15 mA - directly drives terminated transmission lines or multiple TTL loads |
| Propagation Delay | tPLH/tPHL = 3–9 ns - ensures tight timing margins in synchronous bus architectures |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded and instrumentation applications |
| Supply Voltage Range | VCC = 4.5 V to 5.5 V - compatible with standard 5 V logic rails and noise-tolerant design |
| Package Type | SOIC-20 (DW) - surface-mount footprint with 58°C/W thermal resistance for compact PCB layouts |
Pinout & Package
SN74AS374DWR uses a 20-pin SOIC (DW) package with 0.300-inch body width, 1.27 mm lead pitch, and 2.65 mm max height. Pin 1 is located at the top-left corner of the top view, identified by a beveled edge or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 7, 8, 13, 14 | Data Inputs (D1–D8) | Asynchronous parallel data inputs synchronized to CLK↑; tolerate VI = –0.5 V to 7 V |
| 2, 5, 6, 9, 12, 15, 16, 19 | Q Outputs (Q1–Q8) | True-level registered outputs; enter high-impedance state when OE = H |
| 11 | CLK | Positive-edge-triggered clock input; minimum pulse width 4 ns (low), 5.5 ns (high) |
| 1 | OE | Active-low output enable; does not affect internal latch state during assertion |
| 10 | GND | Signal ground reference for all I/O and power pins |
| 20 | VCC | +5 V supply rail; decoupling required within 10 mm of pin per TI layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| High-Speed AS Logic | 125 MHz max clock rate with sub-10 ns propagation delays enables real-time data capture |
| Independent 3-State Control | OE pin disables all eight outputs simultaneously without affecting internal register state |
| Robust Output Drive | 48 mA sink capability eliminates need for external bus drivers in medium-load applications |
| Input Voltage Tolerance | VI range of –0.5 V to 7 V allows interfacing with mixed-voltage or overvoltage-prone systems |
| Thermal Performance | θJA = 58°C/W in SOIC-DW package supports reliable operation at full speed without heatsinking |
Applications
| Industrial PLC I/O Module | Test Equipment Data Capture |
|---|---|
Use Scenario: Capturing sensor readings across 8 analog-to-digital converter channels before multiplexed transmission to a microcontroller. IC Role / Device Role / Timing Role: Parallel data latch synchronizing ADC outputs to system clock; OE used to isolate bus during processing cycles. Use Value: Eliminates glue logic and reduces PCB area versus discrete latch + buffer solutions while maintaining 125 MHz timing compliance. |
Use Scenario: Buffering high-speed digital stimulus patterns from pattern generator FPGA to DUT interface connectors. IC Role / Device Role / Timing Role: Edge-triggered register holding test vectors; OE enables dynamic bus direction switching between stimulus and response paths. Use Value: Supports 125 MHz vector rates with guaranteed tsu/th margins, reducing pattern generation latency versus slower 74ALS variants. |
| Embedded Communication Gateway | Legacy Bus Interface Adapter |
Use Scenario: Translating between a 32-bit microprocessor's local bus and an 8-bit peripheral subsystem using time-multiplexed addressing. IC Role / Device Role / Timing Role: Octal latch capturing address/data nibbles; CLK driven by bus controller strobe, OE managed by decode logic. Use Value: Provides deterministic 3-state release timing (tPZL = 3 ns, tPHZ = 2 ns) critical for avoiding bus contention in multi-master environments. |
Use Scenario: Interfacing modern microcontrollers to legacy ISA-style expansion slots requiring 5 V tolerant, high-drive 3-state buffers. IC Role / Device Role / Timing Role: Bidirectional bus driver registering data transfers; OE tied to slot control signals for direction arbitration. Use Value: Delivers 48 mA drive into 50 Ω lines and withstands –1.2 V input clamping-meeting ISA electrical specifications without level shifters. |
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 |
|---|---|---|---|
| SN74ALS374ADWR | ALS family: lower speed (35 MHz), reduced drive (24 mA), higher tPLH/tPHL (12–17 ns) | Suitable for cost-sensitive, lower-frequency designs where timing margin is relaxed | Select if system clock ≤ 35 MHz and power consumption must be minimized (ICC = 20–31 mA vs. 77–128 mA) |
| SN74F374N | F-family: 100 MHz max, 20 mA drive, PDIP-20 only, no SOIC option | Requires through-hole assembly; lacks DW package for SMT production | Choose only for legacy through-hole boards needing F-series compatibility; not drop-in for SN74AS374DWR footprint |
Compared with SN74ALS374ADWR and SN74F374N, SN74AS374DWR provides the highest clock rate and output current in SOIC-20, making it optimal for space-constrained, high-speed digital interfaces where timing precision and drive strength are prioritized over static power.
Availability
SN74AS374DWR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automated test equipment, embedded communication gateways, and legacy bus interface adapters requiring stable component supply across extended production lifecycles.
Supply support for SN74AS374DWR 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 broad industrial, automotive, and communications applications.
SN74AS374DWR belongs to TI's 74AS logic family-engineered for high-speed digital signal routing in demanding real-time systems where propagation delay and output drive are critical.
FAQ
What is the maximum clock frequency supported by SN74AS374DWR?
The SN74AS374DWR supports a maximum clock frequency of 125 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = 0°C to 70°C). This rating is validated per TI's SDAS167C datasheet and applies specifically to the SN74AS374 variant in SOIC-DW packaging. The SN74AS374DWR achieves this performance using Advanced Schottky technology with optimized internal propagation paths.
Does SN74AS374DWR require external pull-up resistors on its 3-state outputs?
No, SN74AS374DWR does not require external pull-up resistors on its 3-state outputs. Its buffered 3-state architecture provides sufficient drive strength (IOL = 48 mA, IOH = –15 mA) and high-impedance isolation (IOZL/IOZH ≤ ±50 µA) to interface directly with bus lines. The device's output structure eliminates the need for external termination in standard 5 V TTL/CMOS bus environments.
What is the thermal resistance (θJA) of SN74AS374DWR in its SOIC-DW package?
The junction-to-ambient thermal resistance (θJA) of SN74AS374DWR in the SOIC-DW package is 58°C/W, as specified in the TI SDAS167C datasheet. This value assumes standard JEDEC 2-layer board conditions and confirms the device's suitability for continuous operation at full speed without additional heatsinking in typical industrial PCB layouts.
Can SN74AS374DWR operate with a 3.3 V supply voltage?
No, SN74AS374DWR is not rated for 3.3 V operation. Its recommended supply voltage range is strictly 4.5 V to 5.5 V, and absolute maximum VCC is 7 V. Operation below 4.5 V may result in undefined logic states, increased propagation delay, or failure to meet timing specifications. For 3.3 V systems, consider TI's LVC or AUC logic families instead of SN74AS374DWR.
How does the output-enable (OE) function interact with internal latch behavior in SN74AS374DWR?
In SN74AS374DWR, the OE input affects only the output drivers-not the internal flip-flop states. When OE is asserted (high), all Q outputs enter high-impedance mode while retaining their last registered values. New data can still be loaded on subsequent CLK↑ transitions, and old data remains valid, enabling seamless bus arbitration without disrupting internal register integrity.
SN74AS374DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 125 MHz
- Max Propagation Delay @ V, Max CL:
- 9ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 15mA, 48mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 120 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74AS374DWR FAQ
1.How can I place an order for SN74AS374DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS374DWR 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 SN74AS374DWR reliable?
The price and inventory of SN74AS374DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS374DWR is usually 5 days.
3.What payment methods are accepted for SN74AS374DWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS374DWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS374DWR?
SN74AS374DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS374DWR 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 SN74AS374DWR?
For technical support, including SN74AS374DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS374DWR requirements.
6.How does Aetrix verify that SN74AS374DWR is sourced from the original manufacturer or authorized distributors?
All SN74AS374DWR 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 SN74AS374DWR meets industry standards.
7.What is the process for return or replacement of SN74AS374DWR?
All SN74AS374DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS374DWR, 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 SN74AS374DWR part is unused and in its original packaging.
Return procedure for SN74AS374DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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