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Texas Instruments SN74AS4374BDW
- Part No.:
- SN74AS4374BDW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AS4374BDW.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,550
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Product details
Overview
SN74AS4374BDW from Texas Instruments is an octal edge-triggered D-type dual-rank flip-flop with 3-state outputs in a 20-pin SOIC (DW) package, operating at 5 V supply, supporting 125 MHz clock frequency and delivering ±48 mA output drive capability. It functions as a bus-interface register for bidirectional data transfer in high-speed digital systems.
For engineers reviewing the SN74AS4374BDW datasheet, SN74AS4374BDW pinout, SN74AS4374BDW application, or SN74AS4374BDW equivalent, key selection criteria include dual-rank edge-triggering behavior, 3-state bus-driving capability, 4 ns setup time, 1 ns hold time, and industrial-temperature-range compatibility (0°C to 70°C).
Technical Context
The SN74AS4374BDW implements two independent 4-bit ranks of D-type flip-flops, each triggered on the second positive clock edge - requiring two CLK cycles for data propagation from D to Q. Its 3-state outputs are controlled by a dedicated OE input that does not interfere with internal storage state.
This device uses bipolar Schottky (AS) logic technology, enabling fast propagation delays (2–8 ns), high sink current (48 mA), and robust noise immunity (VIH = 2 V, VIL = 0.8 V) under 4.5–5.5 V operation - optimized for TTL-compatible bus interfacing and register staging in legacy control and data acquisition systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | AS (Advanced Schottky) TTL - enables high-speed switching with low power-delay product vs standard TTL |
| Supply Voltage Range | 4.5 V to 5.5 V - ensures compatibility with 5 V TTL/CMOS mixed-signal systems |
| Max Clock Frequency | 125 MHz - supports high-throughput data latching in real-time control registers |
| Output Drive | IOH = –15 mA / IOL = 48 mA - drives heavy capacitive buses directly without external buffers |
| Propagation Delay | tPLH/tPHL = 2–8 ns - guarantees sub-10 ns timing margin for synchronous bus handshaking |
| Setup/Hold Times | tsu = 4 ns, th = 1 ns - defines minimum data stability window before/after CLK↑ for reliable capture |
| Operating Temperature | 0°C to 70°C - qualified for commercial and industrial ambient environments |
Pinout & Package
SN74AS4374BDW is housed in a 20-pin plastic small-outline integrated circuit (SOIC) package (DW), 7.5 mm wide, with standard 0.050″ pitch and gull-wing leads. Pin 1 is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1Q–8Q (Pins 1,2,3,4,6,7,8,9) | 3-State Output | Octal buffered Q outputs; high-impedance when OE = high |
| 1D–8D (Pins 11,12,13,14,15,16,17,18) | Data Input | Asynchronous D inputs; sampled on second CLK↑ transition |
| CLK (Pin 20) | Clock Input | Positive-edge-triggered; initiates dual-rank sampling sequence |
| OE (Pin 10) | Output Enable | Active-low control; disables outputs without affecting internal flip-flop state |
| VCC (Pin 19) | Power Supply | +5 V supply rail for AS TTL logic core and output drivers |
| GND (Pin 5) | Ground Reference | Common return path for logic and output current |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rank edge triggering | Requires two CLK↑ transitions to propagate D to Q - enables pipelined register staging |
| Independent OE control | Allows retention of stored data while outputs float - critical for bus arbitration |
| High-current 3-state outputs | 48 mA sink capability supports direct connection to 50 pF+ bus loads without buffering |
| TTL-compatible interface | VIH = 2 V / VIL = 0.8 V thresholds ensure interoperability with legacy 5 V logic families |
| Fast enable/disable timing | tPZH/tPLZ = 1.5–8 ns - minimizes bus contention windows during output state transitions |
Applications
| Industrial PLC I/O Expansion | Legacy Bus Interface Adapter |
|---|---|
Use Scenario: Expanding discrete I/O points in programmable logic controllers using parallel backplane buses. IC Role / Device Role / Timing Role: Octal latch and bus driver - holds output states while isolating CPU data bus during scan cycles. Use Value: Dual-rank sampling synchronizes with PLC scan timing; 3-state outputs prevent bus contention during read-modify-write sequences. | Use Scenario: Bridging ISA or VMEbus peripherals to modern microcontroller-based controllers. IC Role / Device Role / Timing Role: Bidirectional bus transceiver and data register - buffers address/data lines with direction control via OE. Use Value: 48 mA sink current drives long legacy traces; 125 MHz max clock supports burst-mode transfers up to 62.5 MB/s. |
| Test Equipment Pattern Generator | Avionics Data Acquisition Module |
Use Scenario: Generating synchronized multi-channel digital stimulus waveforms in automated test systems. IC Role / Device Role / Timing Role: Parallel pattern register - stores and clocks out deterministic bit patterns on precise CLK edges. Use Value: 4 ns setup/1 ns hold enables stable pattern loading at >100 MHz; dual-rank architecture allows overlapping load/capture phases. | Use Scenario: Capturing sensor data from analog-to-digital converters in airborne flight control units. IC Role / Device Role / Timing Role: Synchronized input latch - samples ADC parallel outputs under system clock domain with glitch-free bus isolation. Use Value: 0°C to 70°C rating meets DO-160 environmental requirements; 3-state outputs prevent interference during ADC conversion intervals. |
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 |
|---|---|---|---|
| SN74F374N | F-family TTL; lower speed (50 MHz max), higher ICC (60 mA), no dual-rank behavior | Lacks second-edge triggering; suitable only for single-stage latching | Choose for cost-sensitive, lower-speed designs where dual-rank timing is unnecessary |
| 74ACT374SCX | ACT CMOS family; 5 V tolerant, 10 ns tpd, 24 mA IOL, different pinout (20-pin SOIC but non-identical mapping) | CMOS input thresholds (VIH = 3.5 V); incompatible with TTL-level signaling without level translation | Select when mixing with 5 V CMOS logic and lower power consumption is prioritized over legacy bus drive strength |
Compared with SN74AS4374BDW, SN74F374N offers simpler timing but lacks dual-rank functionality and bus-drive strength, while 74ACT374SCX provides CMOS efficiency but requires signal-level adaptation - making SN74AS4374BDW uniquely suited for high-drive, TTL-native, pipelined register applications.
Availability
SN74AS4374BDW is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy bus interface adapters, test equipment pattern generation, and avionics data acquisition modules requiring stable component supply and long-term obsolescence management.
Supply support for SN74AS4374BDW 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74AS4374BDW belongs to TI's legacy AS-series TTL logic family, designed specifically for high-speed, high-drive bus interface and register applications in 5 V systems where timing predictability and robust noise margins are essential.
FAQ
What is the clocking behavior of the SN74AS4374BDW?
The SN74AS4374BDW uses dual-rank edge-triggering: data presented at the D inputs appears at the Q outputs only after the second positive clock (CLK↑) transition. This behavior enables pipelined register staging and distinguishes it from standard single-edge D flip-flops. The SN74AS4374BDW maintains this timing across its full operating temperature range (0°C to 70°C) and supply voltage (4.5 V to 5.5 V).
Does the OE pin affect internal flip-flop operation in the SN74AS4374BDW?
No - the OE (output enable) pin in the SN74AS4374BDW controls only the 3-state output drivers and has no effect on internal flip-flop storage or clocking behavior. Data can be latched or retained while outputs remain in high-impedance, enabling safe bus sharing and arbitration. This isolation is confirmed in the function table and logic diagram of the SN74AS4374BDW datasheet.
What is the maximum capacitive load the SN74AS4374BDW can drive reliably?
The SN74AS4374BDW is characterized for CL = 50 pF in its switching characteristics table, with propagation delays specified under that condition. Its 48 mA low-level output current (IOL) and fast enable/disable times (tPZH/tPLZ ≤ 8 ns) allow reliable driving of heavier loads - up to ~100 pF in practice - though timing margins degrade beyond 50 pF. The SN74AS4374BDW datasheet explicitly cites suitability for "highly capacitive loads" in its description.
Is the SN74AS4374BDW compatible with 3.3 V logic systems?
No - the SN74AS4374BDW is a 5 V-only TTL device with absolute maximum VI = 5.5 V and recommended VIH = 2 V. Its inputs are not 3.3 V tolerant, and operation below 4.5 V violates recommended conditions. Interfacing with 3.3 V systems requires level-shifting; the SN74AS4374BDW must be powered from and driven by 5 V logic sources to meet specifications.
What package type does the SN74AS4374BDW use, and is it RoHS-compliant?
The SN74AS4374BDW uses a 20-pin plastic small-outline IC (SOIC) package designated DW, measuring 7.5 mm wide with 0.050″ lead pitch. As a legacy device introduced in 1989 and last revised in 1995, the SN74AS4374BDW predates RoHS regulations and is not RoHS-compliant; leaded solder and Pb-containing die attach are used. Aetrix Electronics supplies only original TI-manufactured SN74AS4374BDW units with full traceability.
SN74AS4374BDW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- 8ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 15mA, 48mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 150 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74AS4374BDW FAQ
1.How can I place an order for SN74AS4374BDW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS4374BDW 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 SN74AS4374BDW reliable?
The price and inventory of SN74AS4374BDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS4374BDW is usually 5 days.
3.What payment methods are accepted for SN74AS4374BDW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS4374BDW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS4374BDW?
SN74AS4374BDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS4374BDW 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 SN74AS4374BDW?
For technical support, including SN74AS4374BDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS4374BDW requirements.
6.How does Aetrix verify that SN74AS4374BDW is sourced from the original manufacturer or authorized distributors?
All SN74AS4374BDW 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 SN74AS4374BDW meets industry standards.
7.What is the process for return or replacement of SN74AS4374BDW?
All SN74AS4374BDW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS4374BDW, 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 SN74AS4374BDW part is unused and in its original packaging.
Return procedure for SN74AS4374BDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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