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Texas Instruments SN74ALS374ADWR
- Part No.:
- SN74ALS374ADWR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS374ADWR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,363
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Product details
Overview
SN74ALS374ADWR from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state outputs in a 20-pin SOIC (DW) package, operating from 0°C to 70°C at 4.5–5.5 V supply. It features positive-edge clock triggering, buffered output-enable control, and ±24 mA output drive capability-designed for bus interface, I/O port buffering, and bidirectional data exchange in industrial control and legacy computing systems.
For engineers reviewing the SN74ALS374ADWR datasheet, SN74ALS374ADWR pinout, SN74ALS374ADWR application, or SN74ALS374ADWR equivalent, key selection criteria include its 35 MHz maximum clock frequency, 10 ns data setup time, high-impedance output enable timing (tPZH/tPLZ ≤ 10 ns), and compatibility with TTL-level logic families in space-constrained PCB layouts.
Technical Context
This device implements eight independent D-type latches synchronized to the rising edge of CLK, with each output placed into high-impedance (Z) when OE is high. Internal operation continues regardless of OE state-enabling data retention or preloading while outputs are disabled.
The SN74ALS374ADWR belongs to the ALS (Advanced Low-Power Schottky) logic family, delivering lower power than standard LS while maintaining compatible voltage thresholds and drive strength. Its 3-state outputs eliminate need for external pull-ups or bus contention management circuitry in shared-data-path applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky) - ensures TTL-compatible input thresholds and reduced ICC vs. LS, critical for legacy system upgrades. |
| Max Clock Frequency | 35 MHz - supports high-speed data capture in synchronous bus interfaces without external clock division. |
| Output Drive | ±24 mA (IOL/IOH) - directly drives 50 pF loads or multiple TTL inputs without buffer amplification. |
| Propagation Delay | tPLH/tPHL ≤ 12 ns - enables tight timing margins in 20–30 MHz system clocks with minimal skew between channels. |
| Enable Timing | tPZH ≤ 10 ns, tPHZ ≤ 10 ns - allows rapid bus arbitration and fast turn-on/turn-off of data paths during burst transfers. |
| Supply Range | 4.5 V to 5.5 V - operates reliably across unregulated 5 V rails common in industrial backplanes and instrumentation. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded controllers, test equipment, and peripheral interface cards. |
Pinout & Package
SN74ALS374ADWR uses a 20-pin SOIC (DW) package, 7.5 mm wide, 12.8 mm long, 2.65 mm max height, with 1.27 mm lead pitch and RoHS-compliant NiPdAu plating. Moisture sensitivity level is Level-1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 7, 8, 13, 14 | Data Inputs (D1–D8) | Asynchronous parallel data inputs; sampled on CLK↑ and latched to corresponding Q outputs. |
| 2, 5, 6, 9, 12, 15, 16, 19 | Outputs (Q1–Q8) | True (non-inverted) latched outputs; driven low/high or placed in high-Z per OE state. |
| 11 | CLK | Positive-edge-triggered clock input; all eight flip-flops update simultaneously on rising transition. |
| 1 | OE | Active-low output-enable; high = all Q outputs in high-impedance; does not affect internal latch state. |
| 10 | GND | Ground reference for logic and output drivers; must be low-inductance connection to minimize switching noise. |
| 20 | VCC | Positive supply (4.5–5.5 V); decoupling capacitor (0.1 µF ceramic) required adjacent to pin for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Octal 3-state outputs | Enables direct connection to shared data buses without external isolation; eliminates bus contention during multi-device access. |
| Buffered OE and CLK inputs | Reduces capacitive loading on control lines and improves noise immunity-critical in mixed-signal environments with switching regulators. |
| Full parallel access | All eight D inputs accept new data simultaneously; supports byte-wide register loading in one clock cycle. |
| High-impedance retention | OE can be toggled without disturbing internal latch states-allows dynamic bus sharing while preserving register contents. |
| ALS logic family performance | Combines 35 MHz speed with 19 mA typical ICC (outputs low), achieving better speed-power tradeoff than standard LS devices. |
Applications
| Industrial I/O Expansion | Legacy System Bus Interface |
|---|---|
|
Use Scenario: Adding isolated digital input/output capability to PLC backplanes using ISA or VME-style parallel buses. IC Role / Device Role / Timing Role: Acts as an 8-bit bidirectional data latch and bus driver, synchronizing field I/O signals to controller clock domain. Use Value: Eliminates need for discrete buffers or level shifters; 24 mA drive sustains signal integrity across 15 cm ribbon cable runs. |
Use Scenario: Interfacing modern microcontrollers to vintage 8-bit CPU buses (e.g., Z80, 6502) requiring TTL-compatible latching. IC Role / Device Role / Timing Role: Provides edge-triggered register storage and bus-isolated output driving for memory-mapped I/O peripherals. Use Value: 10 ns setup time meets Z80's 250 ns minimum write pulse requirement; OE-controlled high-Z prevents bus conflicts during DMA cycles. |
| Test Equipment Data Capture | Programmable Logic Glue Logic |
|
Use Scenario: Capturing parallel sensor outputs (e.g., ADC result buses) in automated test fixtures with precise timing alignment. IC Role / Device Role / Timing Role: Serves as a synchronous sampling register, capturing 8-bit parallel data on system clock edge. Use Value: Matched propagation delays (<12 ns) across all eight channels ensure simultaneous sampling with <1 ns skew. |
Use Scenario: Implementing custom address decoding or status flag aggregation in FPGA/CPLD-based systems where dedicated logic resources are constrained. IC Role / Device Role / Timing Role: Functions as a configurable 8-bit register bank controlled by FPGA GPIOs for status storage or command staging. Use Value: OE pin allows FPGA to read captured values without bus contention; ALS family ensures compatibility with 3.3 V–5 V mixed-voltage I/O banks via level-shifting resistors. |
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 |
|---|---|---|---|
| SN74ALS374AN | Same ALS logic family, identical electrical specs, but in 20-pin PDIP (N) package with 69°C/W θJA. | Preferred for through-hole prototyping, manual rework, or legacy board replacements where SOIC footprint is unavailable. | Select SN74ALS374AN when hand-soldering or socket-based validation is required; thermal performance is lower than DW package. |
| SN74AS374N | AS-family variant: higher speed (125 MHz fmax), stronger drive (±48 mA), but higher ICC (128 mA) and tighter VIH/VIL thresholds. | Suitable for high-performance bus arbitration or clock-domain crossing where timing margin is critical and power budget allows. | Choose SN74AS374N only if 35 MHz is insufficient and layout supports added heat dissipation; not drop-in due to different DC specs. |
Compared with SN74ALS374ADWR, SN74ALS374AN offers identical functionality in through-hole form for ease of evaluation, while SN74AS374N trades higher power for significantly faster switching-making it appropriate only when the design requires sub-10 ns propagation delays and can accommodate increased supply current.
Availability
SN74ALS374ADWR is available at Aetrix Electronics and suitable for industrial I/O expansion, legacy system bus interfacing, test equipment data capture, and programmable logic glue logic requiring stable component supply across extended production lifecycles.
Supply support for SN74ALS374ADWR 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 solutions for industrial, automotive, and communications markets.
The SN74ALS374ADWR belongs to TI's legacy ALS logic portfolio, engineered for robustness and interoperability in mission-critical industrial control and retro-computing applications where long-term availability and proven reliability are essential.
FAQ
What is the maximum clock frequency supported by the SN74ALS374ADWR?
The SN74ALS374ADWR supports a maximum clock frequency of 35 MHz under recommended operating conditions (VCC = 4.5–5.5 V, TA = 0°C to 70°C). This value is derived from the minimum clock pulse width (tw ≥ 14 ns) and verified across production lots per SDAS167C revision November 1999. Exceeding this limit risks metastability or incomplete state capture.
Does the SN74ALS374ADWR support hot insertion or live bus swapping?
The SN74ALS374ADWR is not rated for hot insertion. Its absolute maximum ratings specify VI and VO limits (–0.5 V to 7 V and –0.5 V to 5.5 V respectively), but no bus-fault protection or power-up sequencing features are included. For live-swapping applications, external current-limiting resistors and power-rail sequencing must be implemented before introducing the SN74ALS374ADWR into the signal path.
Can the SN74ALS374ADWR operate with a 3.3 V supply?
No. The SN74ALS374ADWR requires a minimum VCC of 4.5 V and is specified only for 4.5–5.5 V operation. At 3.3 V, VIH and VOL thresholds fall outside guaranteed ranges, and internal logic may fail to switch reliably. For 3.3 V systems, consider TI's newer LVC or AUP families instead of the ALS series.
What is the function of the OE pin on the SN74ALS374ADWR?
The OE (output-enable) pin on the SN74ALS374ADWR is an active-low control that places all eight Q outputs into high-impedance (Z) state when asserted high. It does not affect internal latch operation-data remains stored and can be updated via D inputs and CLK even while outputs are disabled. This enables safe bus sharing without disrupting register contents.
Is the SN74ALS374ADWR pin-compatible with the SN74AS374 series?
Yes, the SN74ALS374ADWR shares identical pinout and package dimensions (20-pin SOIC DW) with SN74AS374 variants. However, they are not functionally interchangeable without circuit review: AS devices draw significantly more supply current (128 mA vs. 31 mA), require stricter input thresholds, and exhibit faster-but less noise-tolerant-switching behavior.
SN74ALS374ADWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 35 MHz
- Max Propagation Delay @ V, Max CL:
- 16ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 2.6mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 19 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74ALS374ADWR FAQ
1.How can I place an order for SN74ALS374ADWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS374ADWR 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 SN74ALS374ADWR reliable?
The price and inventory of SN74ALS374ADWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS374ADWR is usually 5 days.
3.What payment methods are accepted for SN74ALS374ADWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS374ADWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS374ADWR?
SN74ALS374ADWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS374ADWR 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 SN74ALS374ADWR?
For technical support, including SN74ALS374ADWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS374ADWR requirements.
6.How does Aetrix verify that SN74ALS374ADWR is sourced from the original manufacturer or authorized distributors?
All SN74ALS374ADWR 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 SN74ALS374ADWR meets industry standards.
7.What is the process for return or replacement of SN74ALS374ADWR?
All SN74ALS374ADWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS374ADWR, 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 SN74ALS374ADWR part is unused and in its original packaging.
Return procedure for SN74ALS374ADWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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