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Texas Instruments SN74AS4374BDWR
- Part No.:
- SN74AS4374BDWR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AS4374BDWR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,687
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Product details
Overview
SN74AS4374BDWR 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 bidirectional bus register or I/O port buffer in TTL-compatible digital systems.
For engineers reviewing the SN74AS4374BDWR datasheet, SN74AS4374BDWR pinout, SN74AS4374BDWR application, or SN74AS4374BDWR equivalent, key selection criteria include dual-rank edge-triggering behavior, 3-state output timing (tPZH ≤ 6 ns), high-current drive (IOL = 48 mA), and industrial-temperature operation (0°C to 70°C).
Technical Context
The SN74AS4374BDWR implements eight independent D-type flip-flops triggered on the second positive clock edge, requiring two CLK cycles for data propagation from D to Q. Its dual-rank architecture decouples input latching from output update, enabling synchronized staging of data flow.
3-state control is fully independent of internal flip-flop operation: OE assertion places outputs in high-impedance without affecting stored state or new data capture at D inputs. This supports hot-swappable bus arbitration and multi-master system design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced Schottky (AS) TTL - ensures fast switching with low power-delay product |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V TTL and CMOS interface rails |
| Max Clock Frequency | 125 MHz - supports high-speed synchronous bus buffering up to 125 million transitions/sec |
| Output Drive Strength | IOL = 48 mA / IOH = –15 mA - directly drives heavy capacitive loads (e.g., >100 pF buses) without external buffers |
| Propagation Delay | tPLH/tPHL ≤ 8 ns - enables sub-8 ns path timing in critical register-to-bus signal chains |
| 3-State Enable/Disable Time | tPZH ≤ 6 ns, tPLZ ≤ 7 ns - guarantees rapid bus release for time-multiplexed shared resource access |
| Operating Temperature | 0°C to 70°C - qualified for commercial and industrial ambient environments |
Pinout & Package
SN74AS4374BDWR is housed in a 20-pin plastic small-outline integrated circuit (SOIC) package (DW suffix), 7.5 mm wide, with standard 0.050″ lead pitch and gull-wing leads. Pin 1 is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1Q–8Q (pins 1–4, 6–9) | 3-State Output | Octal buffered Q outputs; high-impedance when OE = high |
| 1D–8D (pins 11–14, 16–19) | Data Input | Asynchronous D inputs; sampled on second rising CLK edge |
| CLK (pin 20) | Clock Input | Positive-edge-triggered master clock for dual-rank latching sequence |
| OE (pin 10) | Output Enable | Active-low control; high = outputs disabled (Z), low = outputs active |
| VCC (pin 15) | Power Supply | +5 V supply rail; must be decoupled locally per high-speed TTL practice |
| GND (pin 5) | Ground Reference | Signal and power return; requires low-inductance connection to minimize noise |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rank edge triggering | Two-stage clock synchronization prevents metastability during asynchronous bus handshaking |
| Independent 3-state control | OE does not interfere with internal flip-flop state retention or new data sampling |
| High-current TTL outputs | 48 mA sink capability eliminates need for external bus drivers in dense backplane designs |
| Fast enable/disable timing | Sub-7 ns 3-state transition supports time-sliced bus sharing at >100 MHz effective rates |
| Industrial temperature range | Validated operation from 0°C to 70°C ensures reliability in non-automotive embedded systems |
Applications
| Bus Interface Register | Parallel I/O Port |
|---|---|
Use Scenario: Isolating CPU address/data bus from peripheral logic during DMA transfers. IC Role / Device Role / Timing Role: Octal 3-state register synchronizing and buffering bidirectional bus signals with precise clock-edge alignment. Use Value: Enables clean bus arbitration using OE-controlled high-Z windows, preventing contention during memory-mapped I/O cycles. | Use Scenario: Expanding microcontroller GPIO count for industrial sensor array readout. IC Role / Device Role / Timing Role: Latched parallel input/output port with independent OE control per group. Use Value: Provides 8-bit synchronized data capture and drive with 48 mA per pin-sufficient for direct LED or relay driver interfacing. |
| Working Register Bank | Buffered Control Latch |
Use Scenario: Staging intermediate results in pipelined arithmetic logic units. IC Role / Device Role / Timing Role: Dual-rank D-flip-flop acting as pipeline stage register between ALU functional blocks. Use Value: Two-phase clocking allows overlapping computation and result latching, improving throughput in fixed-point DSP paths. | Use Scenario: Holding configuration bits for programmable logic devices or analog front-ends. IC Role / Device Role / Timing Role: Non-volatile latch holding static control words until next reconfiguration event. Use Value: 3-state outputs permit safe reprogramming of downstream devices without bus conflicts or glitch injection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop with 3-state output applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F374N | F-family TTL; lower max clock (50 MHz), weaker drive (IOL = 20 mA), no dual-rank timing | Suitable only for legacy 50 MHz bus systems; lacks second-edge synchronization | Select when cost sensitivity outweighs speed and dual-rank requirements |
| SN74ACT374DW | ACT family (CMOS); 5 V tolerant, lower ICC (20 µA), but slower tPLH (9 ns), no AS-speed performance | Better for mixed-voltage systems; unsuitable for 125 MHz timing-critical paths | Prefer where ultra-low static power or 5 V–3.3 V level translation is required |
Compared with SN74F374N and SN74ACT374DW, the SN74AS4374BDWR delivers unique dual-rank edge-triggering and 125 MHz operation with 48 mA drive-making it the only option among the three for high-speed, contention-free bus staging in legacy TTL systems.
Availability
SN74AS4374BDWR is available at Aetrix Electronics and suitable for industrial control panels, legacy test equipment, and military-grade avionics subsystems requiring stable component supply across extended production lifecycles.
Supply support for SN74AS4374BDWR 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 ICs with broad industrial and automotive qualification.
The SN74AS4374BDWR belongs to TI's legacy Advanced Schottky TTL logic family, engineered for high-speed, high-drive digital interfacing in mission-critical commercial and industrial systems.
FAQ
What is the clocking behavior of the SN74AS4374BDWR?
The SN74AS4374BDWR uses dual-rank edge-triggering: data at the D inputs is latched on the first rising CLK edge and appears at Q outputs on the second rising CLK edge. This two-cycle latency enables deterministic staging in synchronous pipelines and avoids race conditions in bus arbitration logic. The SN74AS4374BDWR does not respond to single-edge transitions for output update.
Does the SN74AS4374BDWR support 3.3 V logic levels?
No, the SN74AS4374BDWR is an Advanced Schottky TTL device designed for 5 V operation (4.5–5.5 V). Its input thresholds (VIH = 2 V, VIL = 0.8 V) and output voltages (VOH ≥ 2.4 V, VOL ≤ 0.5 V) align with TTL-not LVCMOS-levels. Direct 3.3 V interface requires level-shifting; the SN74AS4374BDWR itself does not tolerate 3.3 V supply or guarantee 3.3 V-compatible signaling.
How does OE affect internal flip-flop operation in the SN74AS4374BDWR?
In the SN74AS4374BDWR, the OE input controls only output buffer state and has no effect on internal flip-flop storage or data sampling. While OE is high (outputs disabled), the flip-flops continue to capture new D-input data on each second CLK rising edge and retain prior state. This allows seamless bus arbitration without disrupting pipeline integrity.
What is the maximum capacitive load the SN74AS4374BDWR can drive reliably?
The SN74AS4374BDWR is characterized for CL = 50 pF in timing tests, but its 48 mA output sink current supports heavier loads. With proper PCB layout (short traces, ground plane, local decoupling), it reliably drives >100 pF bus capacitance at full 125 MHz speed. For loads exceeding 150 pF, derating clock frequency or adding series termination is recommended to maintain signal integrity.
Is the SN74AS4374BDWR RoHS compliant?
The SN74AS4374BDWR is a legacy device introduced in 1989 and revised in 1995-predating RoHS legislation. Texas Instruments offers RoHS-compliant alternatives (e.g., SN74ACT374), but the SN74AS4374BDWR itself is not RoHS certified. Aetrix Electronics provides full material declaration documentation upon request for compliance verification in regulated programs.
SN74AS4374BDWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
SN74AS4374BDWR FAQ
1.How can I place an order for SN74AS4374BDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS4374BDWR 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 SN74AS4374BDWR reliable?
The price and inventory of SN74AS4374BDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS4374BDWR is usually 5 days.
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SN74AS4374BDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS4374BDWR 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 SN74AS4374BDWR?
For technical support, including SN74AS4374BDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS4374BDWR requirements.
6.How does Aetrix verify that SN74AS4374BDWR is sourced from the original manufacturer or authorized distributors?
All SN74AS4374BDWR 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 SN74AS4374BDWR meets industry standards.
7.What is the process for return or replacement of SN74AS4374BDWR?
All SN74AS4374BDWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS4374BDWR, 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 SN74AS4374BDWR part is unused and in its original packaging.
Return procedure for SN74AS4374BDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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