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Texas Instruments SN74AS174NSR
- Part No.:
- SN74AS174NSR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74AS174NSR.pdf
- Description:
- IC FF D-TYPE SNGL 6BIT 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,292
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Product details
Overview
SN74AS174NSR 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 single-rail output flip-flops, features buffered clock and direct-clear inputs, operates at 5 V supply, supports 100 MHz maximum clock frequency, and uses SOP-16 (NS) package for high-density PCB layouts. It is used in synchronous data latching within industrial control registers.
For engineers reviewing the SN74AS174NSR datasheet, SN74AS174NSR pinout, SN74AS174NSR application, or SN74AS174NSR equivalent, key selection criteria include its 100 MHz toggle rate, 3.5 ns typical tPLH/tPHL propagation delay, 20 mA output drive capability, and compatibility with legacy TTL bus interfaces in register-based digital systems.
Technical Context
The SN74AS174NSR implements six identical D-type flip-flops sharing a common buffered clock (CLK) and active-low asynchronous clear (CLR) input. Each stage transfers data from D to Q on the positive-going edge of CLK, with setup time of 4 ns and hold time of 1 ns under recommended conditions.
All inputs are TTL-compatible, outputs are fully buffered to minimize noise coupling, and the device exhibits no internal feedback or metastability mitigation circuitry-functionality is strictly edge-triggered with no internal state-holding beyond the latch itself.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced Schottky TTL (AS), ensuring fast switching and backward compatibility with standard TTL loads |
| Flip-Flop Count | 6 independent D-type flip-flops with single-rail (Q-only) outputs - no complementary Q̅ outputs |
| Max Clock Frequency | 100 MHz - enables use in high-speed synchronous data capture up to 10 ns period timing windows |
| tPLH / tPHL (typ) | 3.5 ns / 4.5 ns - defines minimum pulse-width and setup/hold margin requirements for reliable edge sampling |
| IOL / IOH | 20 mA sink / –2 mA source - sufficient to drive multiple TTL inputs or small LED indicators directly |
| Supply Voltage Range | 4.5 V to 5.5 V - requires stable 5 V rail; not tolerant of undervoltage or overvoltage operation |
| Operating Temperature | 0°C to +70°C - commercial-grade rating suitable for non-military embedded and instrumentation applications |
Pinout & Package
SOP-16 (NS) package: 16-pin small-outline plastic package, 1.27 mm pitch, 10.4 mm × 5.4 mm body, 2.00 mm max height, tape-and-reel packaging (2000 pcs/reel), RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLR | Active-low asynchronous reset - forces all Q outputs low regardless of CLK or D state |
| 2–7, 9–14 | D1–D6 | Data inputs for each of six flip-flops - sampled on CLK↑ if CLR is high |
| 8 | GND | Ground reference for all logic and power connections |
| 15 | CLK | Buffered positive-edge clock input - triggers simultaneous transfer of all six D inputs to Q outputs |
| 16 | VCC | +5 V power supply - must be decoupled locally due to high transient current during switching |
| 3, 4, 5, 6, 11, 12 | Q1–Q6 | True (non-inverted) outputs - no complementary outputs provided on this variant |
Key Features
| Feature | Design Value |
|---|---|
| Positive-edge triggering | Ensures deterministic sampling aligned to rising clock transitions, eliminating race conditions in synchronous designs |
| Asynchronous clear | Allows immediate global reset without waiting for next clock edge - critical for system initialization and fault recovery |
| Full output buffering | Isolates internal logic from bus loading effects, maintaining signal integrity across multiple fan-out loads |
| TTL-compatible I/O | Direct interface with legacy 74LS/74F logic families without level-shifting or pull-up resistors |
| High-speed AS process | Delivers 2.5× faster propagation than ALS variants, enabling tighter timing budgets in register pipelines |
Applications
| Industrial Control Register | Test Equipment Pattern Generator |
|---|---|
|
Use Scenario: Latching sensor status bits from parallel bus in PLC I/O modules. IC Role / Device Role / Timing Role: Hex D-flip-flop acting as synchronized input register, capturing 6-bit status on rising CLK edge while CLR initializes state at power-up. Use Value: Enables deterministic sampling of noisy industrial signals with 4 ns setup margin and 100 MHz timing headroom. |
Use Scenario: Generating fixed test vectors for ASIC validation using programmable pattern sequences. IC Role / Device Role / Timing Role: Data staging element in shift-register-based vector generator, where D inputs receive pattern bits and Q outputs feed next stage or DUT interface. Use Value: Provides 6-bit parallel load capability with sub-10 ns propagation, supporting >100 MHz test clock rates. |
| Legacy Bus Interface Buffer | Digital Audio Sample Register |
|
Use Scenario: Isolating and synchronizing address/data lines between microcontroller and peripheral memory chips. IC Role / Device Role / Timing Role: Synchronizing burst-mode data transfers by registering handshake signals and address bits before memory access. Use Value: Eliminates metastability risk via positive-edge sampling and provides 20 mA drive to meet TTL bus loading specs. |
Use Scenario: Capturing parallel PCM audio samples from ADC before serial conversion in professional audio gear. IC Role / Device Role / Timing Role: Parallel-to-serial pipeline stage holding 6-bit segments of multi-channel sample words prior to bitstream formatting. Use Value: Delivers jitter-free latching with 1 ns hold time margin, preserving sample timing accuracy in real-time audio paths. |
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 |
|---|---|---|---|
| SN74ALS174NSR | ALS family: slower (50 MHz max), lower ICC (11–19 mA), higher VOL (0.4 V @ 4 mA) | Lower speed, lower power - suitable for cost-sensitive, non-critical timing applications | Select when 100 MHz performance is unnecessary and board-level power budget is constrained |
| SN74AS175BNSR | AS family with quad DFFs and complementary Q/Q̅ outputs - different pinout and function count | Provides inverted outputs per stage but only four flip-flops; not pin-compatible | Choose only if complementary outputs are required and layout allows reassignment of I/O resources |
Compared with SN74ALS174NSR, the SN74AS174NSR delivers 2× clock speed and 2.4× output drive at higher static current; versus SN74AS175BNSR, it offers +50% flip-flop density but lacks Q̅ outputs, making it optimal for space-constrained, single-rail register applications.
Availability
SN74AS174NSR is available at Aetrix Electronics and suitable for industrial control registers, test equipment pattern generators, and legacy bus interface buffers requiring stable component supply and long-term production continuity.
Supply support for SN74AS174NSR 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 and embedded processing technologies with broad industrial, automotive, and communications product portfolios.
The SN74AS174NSR belongs to TI's legacy 74AS logic family, designed specifically for high-speed, TTL-compatible digital systems requiring robust noise immunity and predictable timing in register-transfer-level implementations.
FAQ
What is the maximum clock frequency supported by the SN74AS174NSR?
The SN74AS174NSR supports a maximum clock frequency of 100 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, CL = 50 pF, TA = 0°C to 70°C). This specification is based on characterization data per MIL-STD-883 Class B and reflects guaranteed timing margins for reliable positive-edge triggering across all six flip-flops in the SN74AS174NSR.
Does the SN74AS174NSR provide complementary (Q and Q̅) outputs?
No, the SN74AS174NSR provides only true (Q) outputs for each of its six D-type flip-flops. Complementary outputs are available only on the 'AS175B variant (e.g., SN74AS175BNSR), which contains four flip-flops with dual-rail outputs. The SN74AS174NSR is explicitly designated as a "hex D-type flip-flop with single-rail outputs" in its official TI documentation.
What is the recommended operating voltage range for the SN74AS174NSR?
The SN74AS174NSR is specified to operate reliably within a supply voltage range of 4.5 V to 5.5 V. Operation outside this range - including at 3.3 V or above 5.5 V - is not supported and may result in undefined logic states, excessive ICC, or permanent damage. The SN74AS174NSR requires a well-regulated 5 V rail with local 0.1 µF ceramic decoupling at the VCC pin.
Can unused inputs on the SN74AS174NSR be left floating?
No, all unused inputs on the SN74AS174NSR - including D inputs and CLR - must be tied to a defined logic level (VCC or GND) to prevent erratic behavior. Floating TTL inputs can drift into the linear region, causing increased power consumption, noise susceptibility, and potential oscillation. TI's application report SCBA004 explicitly mandates this practice for proper SN74AS174NSR operation.
What package type and moisture sensitivity level does the SN74AS174NSR use?
The SN74AS174NSR uses the SOP-16 (NS) package: 16-pin small-outline plastic with 1.27 mm pitch, 10.4 mm × 5.4 mm body, and 2.00 mm max height. It carries an MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH), meaning it may be mounted without baking or dry-pack handling - confirmed in TI's official package addendum for SN74AS174NSR.
SN74AS174NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- Package/Case:
- 16-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 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:
- Surface Mount
- Supplier Device Package:
- 16-SO
SN74AS174NSR FAQ
1.How can I place an order for SN74AS174NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS174NSR 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 SN74AS174NSR reliable?
The price and inventory of SN74AS174NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS174NSR is usually 5 days.
3.What payment methods are accepted for SN74AS174NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS174NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS174NSR?
SN74AS174NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS174NSR 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 SN74AS174NSR?
For technical support, including SN74AS174NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS174NSR requirements.
6.How does Aetrix verify that SN74AS174NSR is sourced from the original manufacturer or authorized distributors?
All SN74AS174NSR 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 SN74AS174NSR meets industry standards.
7.What is the process for return or replacement of SN74AS174NSR?
All SN74AS174NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS174NSR, 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 SN74AS174NSR part is unused and in its original packaging.
Return procedure for SN74AS174NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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