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Texas Instruments SN74AS174N
- Part No.:
- SN74AS174N
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74AS174N.pdf
- Description:
- IC FF D-TYPE SNGL 6BIT 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,453
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Product details
Overview
SN74AS174N from Texas Instruments is a hex D-type positive-edge-triggered flip-flop with asynchronous clear, implemented in advanced Schottky TTL (AS) logic. It contains six independent D-flip-flops, each with single-rail Q outputs, buffered clock and direct-clear inputs, 100 MHz maximum clock frequency, and operates at 4.5–5.5 V supply. It is used in high-speed digital systems such as shift registers and pattern generators.
For engineers reviewing the SN74AS174N datasheet, SN74AS174N pinout, SN74AS174N application, or SN74AS174N equivalent, key selection criteria include its 16-pin PDIP package, TTL-compatible input thresholds, 20 mA output drive capability, propagation delays under 10 ns, and compatibility with legacy 74-series logic designs requiring robust noise immunity and deterministic edge-triggered storage.
Technical Context
The SN74AS174N implements six identical D-type latches synchronized to the rising edge of CLK, with asynchronous active-low CLR overriding clocked behavior. Each flip-flop transfers data from D to Q only when CLK transitions from low to high and CLR remains high.
Its fully buffered inputs and outputs provide high noise immunity and isolation from bus disturbances. The device uses AS (Advanced Schottky) bipolar technology, delivering faster switching than ALS variants while maintaining TTL voltage-level compatibility and fan-out capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74AS - Advanced Schottky TTL, optimized for speed and noise immunity in legacy TTL systems |
| Function | Hex D-type flip-flop with asynchronous clear (6 independent channels, single-rail Q outputs) |
| Max Clock Frequency | 100 MHz - enables use in high-speed synchronous logic, e.g., pipeline registers or counters up to 100 MHz |
| Output Drive | 20 mA sink / 2 mA source - supports direct driving of multiple TTL loads without buffers |
| Propagation Delay | tPLH/tPHL ≤ 9.5 ns (CLK→Q) - ensures tight timing margins in critical datapaths |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL rails; not 3.3 V tolerant |
| Operating Temperature | 0°C to +70°C - commercial-grade rating suitable for industrial control and instrumentation |
Pinout & Package
SN74AS174N is housed in a 16-pin plastic dual in-line package (PDIP-N), with 0.3-inch body width and through-hole mounting. Pin 1 is located at the top-left corner (notch or dot side), and the package is RoHS-compliant with NiPdAu lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLR | Active-low asynchronous clear input - resets all six Q outputs to low regardless of CLK state |
| 2–7, 9–14 | 1D–6D | Data inputs for each of six D-flip-flops - sampled on CLK↑ if CLR is high |
| 3, 4, 7, 8, 13, 14 | 1Q–6Q | True (non-inverted) outputs - one per flip-flop; no complementary outputs (unlike 'AS175B) |
| 15 | CLK | Common clock input - positive-edge-triggered; all six flip-flops share this signal |
| 8, 16 | GND / VCC | Power pins - pin 8 is ground, pin 16 is +5 V supply; decoupling capacitor required near pin 16 |
Key Features
| Feature | Design Value |
|---|---|
| Fully buffered I/O | Minimizes crosstalk and improves noise rejection in dense PCB layouts with shared buses |
| Asynchronous clear | Enables system-wide reset without waiting for clock edges - critical for initialization and fault recovery |
| High-speed AS logic | Delivers 100 MHz operation with sub-10 ns propagation delay - outperforms 74ALS174 by >2× in speed |
| TTL-compatible thresholds | VIH = 2.0 V, VIL = 0.8 V - interoperable with standard 74LS/74F/74AS families without level shifting |
| Robust output drive | 20 mA sink capability supports direct interfacing to LEDs, relays, or multiple TTL inputs |
Applications
| Buffer/Storage Register | Shift Register |
|---|---|
Use Scenario: Holding parallel data between processing stages in a microcontroller peripheral interface or data acquisition subsystem. IC Role / Device Role / Timing Role: Six-bit parallel data latch; stores incoming byte from ADC or parallel port on CLK↑ with simultaneous CLR support. Use Value: Eliminates need for discrete latches or additional glue logic; reduces BOM count and layout area in space-constrained industrial modules. | Use Scenario: Implementing a 6-bit serial-to-parallel converter or ring counter in test equipment timing sequencers. IC Role / Device Role / Timing Role: Cascaded D-flip-flops forming a 6-stage shift register; CLK drives sequential bit movement, CLR resets sequence. Use Value: Enables precise, jitter-free timing control at up to 100 MHz - suitable for high-resolution waveform generation or protocol emulation. |
| Pattern Generator | Digital Control Logic |
Use Scenario: Generating fixed test patterns (e.g., PRBS, walking 1s) for IC validation or FPGA stimulus in ATE systems. IC Role / Device Role / Timing Role: Synchronous state-holding element; preloaded via D inputs and clocked to produce deterministic output sequences. Use Value: Provides glitch-free, edge-aligned pattern output without external clock dividers or state machines - simplifies test fixture design. | Use Scenario: Managing enable/disable states for power domains or sensor arrays in programmable logic controllers. IC Role / Device Role / Timing Role: Synchronized control register - holds configuration bits across clock domains and responds to global reset (CLR). Use Value: Ensures deterministic startup and safe power sequencing; prevents metastability in multi-voltage industrial control systems. |
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 | Slower max clock (50 MHz), lower ICC (19 mA), higher VOL (0.4 V @ 4 mA) | Lower speed/power trade-off; less suitable for >60 MHz systems but more thermally efficient | Select when cost or power dissipation is prioritized over speed; requires timing margin recalculation |
| SN74AS175BN | Quad D-flip-flop with complementary Q/Q̅ outputs; same speed (100 MHz) but fewer channels (4 vs 6) | Used where inverted outputs are needed (e.g., differential signaling, toggle logic), not direct functional replacement | Choose only if complementary outputs are required; not a drop-in substitute due to channel count and pinout mismatch |
Compared with SN74ALS174N, SN74AS174N delivers double the clock rate and stronger drive but consumes ~50% more supply current; versus SN74AS175BN, it offers two additional flip-flops and single-rail outputs, making it preferable for parallel data storage where Q̅ is unnecessary.
Availability
SN74AS174N is available at Aetrix Electronics and suitable for industrial control systems, test equipment design, and legacy TTL-based embedded systems requiring stable component supply and long-term obsolescence management.
Supply support for SN74AS174N 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 with broad industrial and automotive reach.
The SN74AS174N belongs to TI's legacy 74AS logic family, designed specifically for high-speed, noise-immune digital systems requiring TTL compatibility, deterministic timing, and robust operation in industrial environments.
FAQ
What is the maximum operating frequency of the SN74AS174N?
The SN74AS174N supports a maximum clock frequency of 100 MHz under recommended conditions (VCC = 4.5–5.5 V, CL = 50 pF). This value is based on characterization data per MIL-STD-883 Class B and is not production-tested, but confirmed in TI's SDAS207E datasheet revision May 2002. Timing margins must be verified in the target application layout.
Does the SN74AS174N have complementary outputs (Q and Q̅)?
No, the SN74AS174N provides only true (Q) outputs for each of its six flip-flops. Complementary outputs are available only on the SN74AS175B variant. The SN74AS174N pinout and logic diagram confirm single-rail outputs only - using it for inverted logic requires external inverters or redesign.
Can the SN74AS174N be used with a 3.3 V supply?
No, the SN74AS174N is not rated for 3.3 V operation. Its absolute maximum supply voltage is 7 V, but recommended operating range is strictly 4.5 V to 5.5 V. Input thresholds (VIH = 2.0 V, VIL = 0.8 V) and output levels (VOH ≈ VCC–2 V) assume a 5 V rail; interfacing with 3.3 V logic requires level translation.
What is the purpose of the NC pins on the SN74AS174N?
The SN74AS174N has no NC (no-connect) pins in its 16-pin PDIP package. All 16 pins are assigned: pins 1 (CLR), 2–7/9–14 (D/Q), 15 (CLK), 8 (GND), and 16 (VCC). Confusion may arise from other variants (e.g., 'AS175B) or package drawings showing unused pads - but for SN74AS174N in N-package, every pin is electrically connected and functionally defined.
How does the SN74AS174N handle unused inputs?
All unused inputs on the SN74AS174N - including unconnected D inputs and the CLK line if unused - must be tied to a valid logic level (VCC or GND) to prevent floating nodes, which can cause excessive ICC, oscillation, or ESD susceptibility. TI's SCBA004 application report explicitly mandates this for proper device operation and reliability.
SN74AS174N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 6
- Clock Frequency:
- 100 MHz
- Max Propagation Delay @ V, Max CL:
- 10ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 2mA, 20mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 45 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
SN74AS174N FAQ
1.How can I place an order for SN74AS174N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS174N 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 SN74AS174N reliable?
The price and inventory of SN74AS174N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS174N is usually 5 days.
3.What payment methods are accepted for SN74AS174N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS174N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS174N?
SN74AS174N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS174N 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 SN74AS174N?
For technical support, including SN74AS174N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS174N requirements.
6.How does Aetrix verify that SN74AS174N is sourced from the original manufacturer or authorized distributors?
All SN74AS174N 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 SN74AS174N meets industry standards.
7.What is the process for return or replacement of SN74AS174N?
All SN74AS174N units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS174N, 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 SN74AS174N part is unused and in its original packaging.
Return procedure for SN74AS174N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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