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Texas Instruments SN74ALS174NS
- Part No.:
- SN74ALS174NS
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ALS174NS.pdf
- Description:
- D FLIP-FLOP, ALS SERIES TTL
- Quantity:
- Payment:
- Shipping:
Inventory:5,500
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Product details
Overview
SN74ALS174NS from Texas Instruments is a hex D-type positive-edge-triggered flip-flop with direct-clear input, implemented in Advanced Schottky TTL logic. It contains six independent single-rail output flip-flops, operates at 5 V (4.5–5.5 V), supports up to 40 MHz clock frequency, and is rated for 0°C to 70°C industrial temperature range. It serves as a storage register or shift register element in synchronous digital systems.
For engineers reviewing the SN74ALS174NS datasheet, SN74ALS174NS pinout, SN74ALS174NS application, or SN74ALS174NS equivalent, key selection criteria include TTL-compatible input/output levels, 6-bit parallel storage capability, direct asynchronous clear functionality, propagation delay ≤17 ns, and compatibility with legacy 300-mil DIP-based board designs.
Technical Context
The SN74ALS174NS implements six edge-triggered D latches synchronized to the rising edge of CLK, with each stage featuring independent D input and Q output. Its direct-clear (CLR) input resets all outputs asynchronously to low, independent of clock state.
All inputs and outputs conform to standard TTL voltage thresholds (VIH = 2 V min, VIL = 0.8 V max), and it drives ±0.4 mA / +8 mA loads while maintaining VOH ≥ VCC–2 V and VOL ≤ 0.4 V at IOL = 4 mA. It uses bipolar Advanced Schottky technology for improved speed-power tradeoff over standard TTL.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced Schottky TTL (ALS), fully compatible with standard TTL interfaces |
| Number of Flip-Flops | 6 independent D-type stages, each with single-rail Q output (no Q̅) |
| Supply Voltage | 4.5 V to 5.5 V - ensures robust operation across standard 5 V rail tolerances |
| Max Clock Frequency | 40 MHz - supports medium-speed synchronous logic in control and interface applications |
| Propagation Delay | ≤17 ns (tPHL/tPLH, CLK to Q) - enables reliable timing in 25 ns cycle-time systems |
| Input Setup Time | 10 ns (tsu, D before CLK↑) - defines minimum data stability window for valid latching |
| Operating Temperature | 0°C to 70°C - qualified for commercial/industrial ambient environments |
Pinout & Package
SN74ALS174NS is supplied in a 16-pin plastic dual in-line package (PDIP), designated "N" or "NS" suffix, with 300-mil body width and through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLK | Common positive-edge-triggered clock input for all six flip-flops |
| 2 | 1Q | Output of first flip-flop (non-inverted) |
| 3 | 1D | Data input for first flip-flop |
| 4 | 2D | Data input for second flip-flop |
| 5 | 2Q | Output of second flip-flop (non-inverted) |
| 6 | 3D | Data input for third flip-flop |
| 7 | 3Q | Output of third flip-flop (non-inverted) |
| 8 | GND | Ground reference for power and signal integrity |
| 9 | 4Q | Output of fourth flip-flop (non-inverted) |
| 10 | 5Q | Output of fifth flip-flop (non-inverted) |
| 11 | 4D | Data input for fourth flip-flop |
| 12 | 5D | Data input for fifth flip-flop |
| 13 | 6D | Data input for sixth flip-flop |
| 14 | 6Q | Output of sixth flip-flop (non-inverted) |
| 15 | CLR | Active-low asynchronous clear input - resets all Q outputs to low immediately |
| 16 | VCC | +5 V supply terminal - powers internal ALS circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Hex D-type architecture | Provides six independent storage bits in one IC - reduces component count in register files and pattern generators |
| Direct-clear (CLR) input | Asynchronously resets all outputs without requiring clock edges - essential for system initialization and fault recovery |
| TTL-compatible I/O | Interoperates directly with 74LS, 74S, and other TTL families without level-shifting circuitry |
| Positive-edge clocking | Synchronizes data capture on rising CLK transitions - simplifies timing analysis in synchronous designs |
| ALS process technology | Delivers 40 MHz operation with lower power than standard Schottky TTL (e.g., 74S), improving thermal margin |
Applications
| Buffer/Storage Register | Shift Register Stage |
|---|---|
Use Scenario: Holding parallel data between bus transactions in microcontroller peripheral interfaces. IC Role / Device Role / Timing Role: Acts as a 6-bit latch to isolate and retain data during address decode delays or bus arbitration gaps. Use Value: Prevents bus contention and ensures deterministic read-back timing using its guaranteed 10 ns setup and ≤17 ns propagation delay. | Use Scenario: Implementing a 6-bit serial-in/parallel-out shift register for LED display multiplexing. IC Role / Device Role / Timing Role: Each SN74ALS174NS stage captures one bit per clock edge; cascaded CLK and D lines enable serial loading. Use Value: Enables precise 6-bit alignment with minimal external logic due to identical timing across all six flip-flops. |
| Pattern Generator | System Initialization Logic |
Use Scenario: Generating fixed test patterns for digital subsystem validation in bench testing setups. IC Role / Device Role / Timing Role: Preloaded via D inputs and triggered by a free-running clock to produce repeatable binary sequences. Use Value: Delivers stable, jitter-free output waveforms with TTL-level drive strength suitable for driving logic analyzers or FPGA test points. | Use Scenario: Resetting multiple downstream logic blocks simultaneously at power-up in industrial controllers. IC Role / Device Role / Timing Role: Receives a debounced reset signal on CLR to force all Q outputs low before firmware begins execution. Use Value: Guarantees known initial state across six channels with sub-15 ns assertion time, eliminating race conditions in startup sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS174N | Identical electrical specs and pinout; differs only in packaging - "N" denotes standard PDIP, "NS" denotes PDIP with moisture-sensitive labeling per J-STD-020 | No functional difference; both support same 0°C to 70°C operation and 40 MHz clocking | Select SN74ALS174NS when moisture sensitivity compliance and tape-and-reel delivery (2000-unit reels) are required for SMT-compatible assembly lines. |
| SN74AS174N | Same pinout and function but AS-family - higher speed (100 MHz fmax), lower tsu (4 ns), higher ICC (30 mA typical), and tighter VOL (0.35 V at 20 mA) | Better suited for high-speed timing-critical paths; requires more PCB decoupling and thermal management | Choose SN74AS174N only if the design demands >40 MHz operation or sub-10 ns setup; otherwise SN74ALS174NS offers better power-efficiency and noise immunity. |
Compared with SN74ALS174N, the SN74ALS174NS provides identical logic behavior and timing but ships in JEDEC-standard moisture-sensitive packaging for automated placement. Against SN74AS174N, it trades speed for lower static current (19 mA vs. 30 mA) and relaxed drive requirements - making it preferable for cost-sensitive, thermally constrained, or noise-immune industrial control applications.
Availability
SN74ALS174NS is available at Aetrix Electronics and suitable for buffer/register implementations, shift register stages, pattern generation circuits, and system initialization logic requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS174NS 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 specializing in analog, embedded processing, and logic solutions, with decades of leadership in TTL and advanced logic families.
The SN74ALS174NS belongs to TI's Advanced Schottky TTL (ALS) logic product line, engineered for balanced speed and power efficiency in industrial and commercial digital systems where compatibility with legacy TTL infrastructure is essential.
FAQ
What logic family does the SN74ALS174NS belong to, and how does it interface with other TTL devices?
The SN74ALS174NS belongs to the Advanced Schottky TTL (ALS) logic family. It features standard TTL input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) and output drive capability (IOH = –0.4 mA, IOL = 8 mA), ensuring full interoperability with 74LS, 74S, and earlier TTL families without level translation. Its VOH and VOL specifications align precisely with TTL voltage standards, allowing direct connection to other TTL inputs and outputs in mixed-family systems.
Does the SN74ALS174NS provide complementary (Q and Q̅) outputs per flip-flop?
No, the SN74ALS174NS provides only true (Q) outputs for each of its six D-type flip-flops. Complementary outputs are exclusive to the 'ALS175 and 'AS175B variants, which contain four flip-flops with both Q and Q̅ terminals. The SN74ALS174NS datasheet explicitly confirms single-rail output configuration, and its pinout shows no Q̅ terminals - only pins 2, 5, 7, 9, 10, and 14 are labeled as 1Q through 6Q.
What is the maximum clock frequency supported by the SN74ALS174NS, and what limits this value?
SN74ALS174NS supports a maximum clock frequency of 40 MHz under recommended operating conditions (VCC = 4.5–5.5 V, TA = 0°C to 70°C, CL = 50 pF). This limit arises from its propagation delay (tPLH/tPHL ≤ 17 ns) and setup time requirement (tsu = 10 ns), which together define the minimum clock period (≥27 ns). Operation beyond 40 MHz risks setup/hold violations and metastability, especially with capacitive loading or marginal signal rise times.
Can the SN74ALS174NS be used in place of the SN74ALS174N, and what is the difference between them?
Yes, SN74ALS174NS is a direct replacement for SN74ALS174N in all electrical and functional respects. The "NS" suffix indicates compliance with J-STD-020 moisture sensitivity level (MSL) requirements and packaging in tape-and-reel format (2000 units/reel), whereas "N" denotes standard PDIP packaging without MSL labeling. Both share identical die, pinout, timing, and DC specifications - the distinction is purely in packaging and logistics handling.
What is the purpose of the CLR input on the SN74ALS174NS, and how does it behave relative to the clock?
The CLR (clear) input on the SN74ALS174NS is an active-low, asynchronous control that forces all six Q outputs low immediately upon assertion - independent of the CLK signal state or edge. When CLR returns high, the flip-flops resume normal edge-triggered operation on subsequent CLK rising edges. This behavior is confirmed in the device's function table and logic diagrams, and enables reliable system-wide reset without dependency on clock availability or phase.
SN74ALS174NS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 16-SOIC (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 6
- Clock Frequency:
- 50 MHz
- Max Propagation Delay @ V, Max CL:
- 17ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 400µA, 8mA
- 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:
- 16-SO
SN74ALS174NS FAQ
1.How can I place an order for SN74ALS174NS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS174NS 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 SN74ALS174NS reliable?
The price and inventory of SN74ALS174NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS174NS is usually 5 days.
3.What payment methods are accepted for SN74ALS174NS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS174NS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS174NS?
SN74ALS174NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS174NS 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 SN74ALS174NS?
For technical support, including SN74ALS174NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS174NS requirements.
6.How does Aetrix verify that SN74ALS174NS is sourced from the original manufacturer or authorized distributors?
All SN74ALS174NS 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 SN74ALS174NS meets industry standards.
7.What is the process for return or replacement of SN74ALS174NS?
All SN74ALS174NS units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS174NS, 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 SN74ALS174NS part is unused and in its original packaging.
Return procedure for SN74ALS174NS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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