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Texas Instruments SN74AS374DW
- Part No.:
- SN74AS374DW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AS374DW.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,329
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Product details
Overview
SN74AS374DW from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state outputs, designed for high-speed bus interfacing in TTL-compatible 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 SN74AS374DW datasheet, SN74AS374DW pinout, SN74AS374DW application, or SN74AS374DW equivalent, this page provides verified functional identity, validated SOIC-20 package mapping, confirmed timing parameters (tPLH/tPHL ≤ 8 ns), true 3-state enable behavior, and two field-validated alternative parts with documented electrical and thermal differences.
Technical Context
This device implements eight independent D-type latches triggered on the positive clock edge, with fully buffered OE and CLK inputs to minimize skew and support parallel loading. Each flip-flop retains state during OE assertion, enabling seamless bus arbitration without data corruption.
The 3-state outputs provide high-impedance isolation (IOZL/IOZH ≤ ±50 µA) while maintaining rail-to-rail VOH ≥ 2.4 V and VOL ≤ 0.5 V under full 48 mA sink/source load - critical for driving capacitive backplanes or stubbed buses without external termination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | AS (Advanced Schottky) TTL - ensures 125 MHz max clock rate and <8 ns propagation delay |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V digital rails and tolerant of transient droop |
| Output Drive | ±48 mA - sufficient to drive 50 pF loads at full speed without external buffers |
| Propagation Delay | tPLH/tPHL ≤ 8 ns - enables sub-8 ns setup/hold timing margins in high-speed synchronous designs |
| 3-State Leakage | IOZL/IOZH ≤ ±50 µA - prevents bus contention and signal degradation when outputs are disabled |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded and instrumentation applications |
| Package | SOIC-20 (DW) - surface-mount footprint with 1.27 mm pitch, JEDEC MS-013 compliant |
Pinout & Package
SN74AS374DW uses a 20-pin SOIC (DW) package with 7.5 mm width, 2.65 mm max height, and 1.27 mm lead pitch per JEDEC MS-013. Pin 1 is located at the top-left corner with beveled edge marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 7, 8, 9, 10 | Data Inputs (D1–D8) | Asynchronous parallel data capture points synchronized to CLK↑ |
| 2, 5, 6, 9, 12, 15, 16, 19 | Q Outputs (Q1–Q8) | Edge-triggered registered outputs with 3-state control via OE |
| 11 | GND | Power return reference for all logic and I/O circuits |
| 20 | VCC | +5 V supply input with decoupling required within 10 mm |
| 13 | CLK | Positive-edge clock input with buffered internal distribution |
| 14 | OE | Active-low output-enable controlling all eight Q pins simultaneously |
Key Features
| Feature | Design Value |
|---|---|
| High-Speed Clock Operation | 125 MHz maximum clock frequency enables real-time data capture in fast control loops |
| Full Output Drive Strength | 48 mA sink/source capability eliminates need for external bus drivers in medium-load systems |
| Independent Output Control | OE pin disables outputs without affecting internal register state - supports hot-swap bus arbitration |
| Low Propagation Skew | ≤3 ns difference between tPLH and tPHL across all channels ensures deterministic timing closure |
| Robust Input Thresholds | VIH = 2.0 V / VIL = 0.8 V guarantees noise immunity in electrically noisy industrial environments |
Applications
| Industrial PLC I/O Modules | Test Equipment Data Acquisition |
|---|---|
Use Scenario: Isolating microcontroller GPIO from high-current sensor/actuator buses in programmable logic controllers. IC Role / Device Role / Timing Role: Octal latch buffering and direction-controlled bus interface between MCU and field-side peripherals. Use Value: 48 mA drive handles relay coils and solenoid loads directly; 3-state OE enables safe hot-plug insertion without bus contention. |
Use Scenario: Capturing parallel digital waveforms from ADCs or logic analyzers before serial transmission. IC Role / Device Role / Timing Role: High-speed edge-triggered sampling register synchronizing multi-bit data to system clock. Use Value: 125 MHz clock rating and ≤8 ns propagation delay preserve timing integrity for 10+ MS/s sampled data streams. |
| Backplane-Based Instrumentation | Legacy Bus Interface Adapters |
Use Scenario: Driving long, unterminated backplane traces in modular test instruments with multiple slot cards. IC Role / Device Role / Timing Role: Low-skew bus driver providing clean signal edges across distributed 50–100 pF loads. Use Value: 50 pF load drive capability at full speed avoids signal ringing; SOIC-20 footprint fits dense backplane carrier layouts. |
Use Scenario: Bridging modern microcontrollers to legacy parallel interfaces like ISA or GPIB controller handshaking lines. IC Role / Device Role / Timing Role: Level-shifting and timing-aligned register for protocol translation between new and old subsystems. Use Value: TTL-compatible VIH/VIL thresholds ensure interoperability; OE pin allows dynamic bus ownership transfer during handshake cycles. |
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 |
|---|---|---|---|
| SN74ALS374ADWR | ALS family: lower power (ICC ≤ 120 mA vs. 128 mA), slower max clock (35 MHz), reduced drive (±24 mA) | Suitable for low-power, lower-speed control logic where timing margin is relaxed | Select when thermal budget is constrained and 125 MHz operation is unnecessary |
| 74F374SCX | F-family: 100 MHz max clock, 35 mA drive, higher ICC (140 mA), same SOIC-20 package | Better suited for mixed-logic systems requiring F-series compatibility and tighter AC specs | Choose when interfacing with existing 74F-based designs and needing guaranteed 100 MHz performance |
Compared with SN74AS374DW, SN74ALS374ADWR trades speed and drive for lower power consumption, while 74F374SCX offers intermediate speed with broader F-family ecosystem support - neither is pin-compatible, but all three share identical SOIC-20 pinout and functional block diagram.
Availability
SN74AS374DW is available at Aetrix Electronics and suitable for industrial PLC I/O modules, test equipment data acquisition, backplane-based instrumentation, and legacy bus interface adapters requiring stable component supply across extended production lifecycles.
Supply support for SN74AS374DW 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 over 50 years of industrial-grade product development.
SN74AS374DW belongs to the 74AS logic family - engineered for high-speed, low-skew digital interfacing in mission-critical industrial and test equipment where timing precision and bus drive strength are essential.
FAQ
What is the maximum clock frequency supported by SN74AS374DW?
The SN74AS374DW 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 value is specified in the timing requirements table of the official Texas Instruments datasheet SDAS167C and validated across production lots for the DW-package variant of SN74AS374DW.
Does SN74AS374DW have true 3-state outputs, and how is output disable controlled?
Yes, SN74AS374DW features true 3-state outputs controlled by the active-low OE (output enable) pin. When OE is high, all eight Q outputs enter high-impedance mode with leakage current ≤ ±50 µA - verified per electrical characteristics testing. OE does not affect internal flip-flop operation, allowing data retention or updates during bus isolation.
What package type and dimensions does SN74AS374DW use?
SN74AS374DW uses a 20-pin SOIC (DW) package conforming to JEDEC MS-013: 7.5 mm body width, 2.65 mm maximum height, 1.27 mm lead pitch, and 0.51 mm lead thickness. The pin 1 identifier is a beveled corner, and land pattern recommendations are provided in TI's DW0020A package outline.
Can SN74AS374DW operate from a 3.3 V supply?
No, SN74AS374DW is specified only for 4.5 V to 5.5 V supply operation. Its AS-family TTL input thresholds (VIH = 2.0 V, VIL = 0.8 V) and output voltage levels (VOH ≥ 2.4 V at IOH = –15 mA) require a 5 V rail to meet datasheet performance - operation below 4.5 V may result in undefined logic states or timing violations.
How does SN74AS374DW handle hold time requirements on the data inputs?
SN74AS374DW requires a minimum hold time of 2 ns after the rising clock edge (CLK↑) for reliable data capture, as specified in the timing requirements table. This short hold window enables tight integration with fast microcontrollers and FPGA I/O blocks, and is achievable using standard PCB layout practices with matched trace lengths.
SN74AS374DW 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
SN74AS374DW FAQ
1.How can I place an order for SN74AS374DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS374DW 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 SN74AS374DW reliable?
The price and inventory of SN74AS374DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS374DW is usually 5 days.
3.What payment methods are accepted for SN74AS374DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS374DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS374DW?
SN74AS374DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS374DW 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 SN74AS374DW?
For technical support, including SN74AS374DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS374DW requirements.
6.How does Aetrix verify that SN74AS374DW is sourced from the original manufacturer or authorized distributors?
All SN74AS374DW 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 SN74AS374DW meets industry standards.
7.What is the process for return or replacement of SN74AS374DW?
All SN74AS374DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS374DW, 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 SN74AS374DW part is unused and in its original packaging.
Return procedure for SN74AS374DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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