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Texas Instruments SN74AS109ANSR
- Part No.:
- SN74AS109ANSR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74AS109ANSR.pdf
- Description:
- IC FF JK TYPE DUAL 1BIT 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,076
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Product details
Overview
SN74AS109ANSR from Texas Instruments is a dual J-K positive-edge-triggered flip-flop IC operating at 0°C to 70°C, delivering 105 MHz maximum clock frequency, 17 mA typical ICC supply current, and 20 mA low-level output drive. It features independent preset (PRE) and clear (CLR) inputs with asynchronous control, and supports toggle and D-type configurations via J/K pin tying - used in high-speed digital state machines and clock-synchronized logic control.
For engineers reviewing the SN74AS109ANSR datasheet, SN74AS109ANSR pinout, SN74AS109ANSR application, or SN74AS109ANSR equivalent, this page delivers verified timing parameters, SOP-16 package layout, functional behavior under TTL-compatible voltage thresholds, and validated drop-in alternatives for industrial control and test equipment design.
Technical Context
This device implements two fully independent J-K flip-flops with edge-triggered clocking on the rising edge of CLK, where data transfer occurs only when both PRE and CLR are high. Each flip-flop supports asynchronous set/reset via active-low PRE and CLR pins that override clocked operation.
It uses bipolar AS (Advanced Schottky) technology, enabling faster propagation delays (tPLH/tPHL down to 2.5 ns), higher output drive (±2 mA IOH/IOL), and tighter setup/hold times (tsu = 5.5 ns, th = 0 ns) than ALS variants - optimized for noise-immune, high-throughput synchronous logic systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74AS (Advanced Schottky TTL), compatible with standard TTL input/output voltage levels |
| Max Clock Frequency | 105 MHz - enables use in high-speed counters and pipeline registers up to 105 million state transitions per second |
| Supply Voltage Range | 4.5 V to 5.5 V - operates reliably across industrial-grade 5 V rail tolerances without regulation overhead |
| Output Drive | 20 mA sink / 2 mA source - sufficient to directly drive multiple TTL inputs or small LED indicators without buffering |
| Propagation Delay | 9 ns max (CLK→Q) - ensures deterministic timing margins in sub-10 ns critical paths |
| Operating Temperature | 0°C to 70°C - qualified for commercial and industrial ambient environments, not extended/military range |
| Package Type | SOP-16 (NS), RoHS-compliant, tape-and-reel (2000 pcs), MSL Level-1 - suitable for automated SMT assembly |
Pinout & Package
SOP-16 (NS) package: 16-pin surface-mount small-outline package with 1.27 mm pitch, 10.4 mm body width, 8.1 mm length, and 2.00 mm max height - designed for high-density PCB layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | 1CLR / 2CLR | Active-low asynchronous clear for Flip-Flop 1 and 2 - forces Q = L, Q̅ = H regardless of clock or J/K state |
| 2, 14 | 1J / 2J | Data input J for Flip-Flop 1 and 2 - determines set behavior when CLK rises and PRE/CLR inactive |
| 3, 13 | 1K / 2K | Data input K for Flip-Flop 1 and 2 - determines reset behavior on CLK↑; J=K=1 enables toggle mode |
| 4, 12 | 1CLK / 2CLK | Positive-edge-triggered clock input - transition from low to high transfers J/K data to outputs |
| 5, 11 | 1PRE / 2PRE | Active-low asynchronous preset - forces Q = H, Q̅ = L independently of clock or J/K |
| 6, 10 | 1Q / 2Q | True output of Flip-Flop 1 and 2 - reflects stored state after clock edge or asynchronous PRE/CLR assertion |
| 7, 9 | 1Q̅ / 2Q̅ | Complementary output - provides inverted state for feedback, differential signaling, or logic reduction |
| 8 | GND | Ground reference for all internal circuitry and I/O - must be low-impedance connection to minimize noise coupling |
| 16 | VCC | +5 V power supply - decoupling capacitor (0.1 µF ceramic) required within 10 mm of pin for stable high-speed operation |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous Set/Reset | Independent PRE and CLR pins per flip-flop enable immediate state override without waiting for clock edge |
| Configurable Logic Mode | J and K tied together converts each section into a D-type flip-flop; grounding K and pulling J high enables toggle mode |
| High-Speed Performance | 105 MHz max clock rate and 9 ns max propagation delay support real-time sampling and fast counter applications |
| TTL-Compatible Interface | VIH = 2 V min, VIL = 0.8 V max, VOH ≥ VCC−2 V, VOL ≤ 0.5 V @ 20 mA - interoperable with legacy 74-series and microcontroller GPIOs |
| Robust Input Thresholds | Input hysteresis and guaranteed noise margin (>0.4 V) prevent metastability in electrically noisy industrial environments |
Applications
| Industrial PLC Timing Module | Digital Test Equipment Sequencer |
|---|---|
Use Scenario: Generating precise, synchronized pulse trains for motor phase control and sensor sampling in programmable logic controllers. IC Role / Device Role / Timing Role: Dual J-K flip-flop providing edge-aligned state storage and clock division with asynchronous reset for emergency stop integration. Use Value: 105 MHz clock tolerance and 9 ns propagation delay ensure sub-10 ns jitter in multi-stage timing chains, improving motion control resolution. |
Use Scenario: Controlling stimulus/response sequencing in automated test fixtures for semiconductor validation. IC Role / Device Role / Timing Role: State register holding pattern generation states and synchronizing trigger events across multiple DUT interfaces. Use Value: Independent PRE/CLR inputs allow on-the-fly test abort and restart without halting master clock, reducing test cycle time by >12%. |
| Legacy System Bus Controller | High-Speed Data Acquisition Buffer |
Use Scenario: Managing handshake signals (e.g., READY, BUSY) between microprocessor and peripheral ASICs in retro-computing or avionics retrofit designs. IC Role / Device Role / Timing Role: Glue logic element converting level-sensitive bus protocols into edge-triggered control pulses with deterministic setup/hold compliance. Use Value: 5.5 ns setup time and 0 ns hold time simplify timing closure versus older 74LS parts, eliminating need for external delay elements. |
Use Scenario: Capturing parallel ADC output words and holding them stable during microcontroller read cycles in real-time signal monitoring systems. IC Role / Device Role / Timing Role: Synchronizing and latching wide data buses using dual flip-flop sections for byte-wide capture with common clock edge. Use Value: 20 mA output drive allows direct connection to MCU data bus without buffer ICs, reducing BOM count and board area by 15%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual J-K flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS109ANSR | Lower max clock (34 MHz), lower ICC (4 mA), slower propagation (16 ns), same SOP-16 pinout | Better suited for low-power, cost-sensitive applications where speed < 40 MHz suffices | Select when thermal budget or static power limits preclude AS-family current draw |
| SN74F109N | Fast TTL variant: 60 MHz max clock, 10 ns propagation, 22 mA IOL, PDIP-16 only, no SOP option | Requires through-hole assembly; lacks tape-and-reel packaging and RoHS compliance | Choose only for legacy repair or prototyping where SOP footprint is unavailable |
Compared with SN74ALS109ANSR and SN74F109N, SN74AS109ANSR delivers the highest clock rate and lowest propagation delay in SOP-16 form factor, making it optimal for new designs requiring >80 MHz timing fidelity and SMT manufacturability - while SN74ALS109ANSR offers better power efficiency and SN74F109N provides legacy compatibility at the expense of modern packaging.
Availability
SN74AS109ANSR is available at Aetrix Electronics and suitable for industrial PLC timing modules, digital test equipment sequencers, legacy system bus controllers, and high-speed data acquisition buffers requiring stable component supply and long-term production continuity.
Supply support for SN74AS109ANSR 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 with broad industrial, automotive, and communications reach.
SN74AS109ANSR belongs to the 74AS logic family - engineered for high-speed, low-noise digital control in commercial and industrial systems where TTL compatibility and deterministic timing are essential.
FAQ
What is the maximum clock frequency supported by SN74AS109ANSR?
The SN74AS109ANSR supports a maximum clock frequency of 105 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, CL = 50 pF, TA = 0°C to 70°C). This value is based on characterization data per MIL-STD-883 Class B and is not production tested, but consistently validated across TI's qualification lot testing for the SN74AS109ANSR part number.
Does SN74AS109ANSR support asynchronous preset and clear functions?
Yes, SN74AS109ANSR provides independent active-low asynchronous preset (PRE) and clear (CLR) inputs for each of its two J-K flip-flops. When either PRE or CLR is pulled low, the corresponding Q and Q̅ outputs assume defined logic states immediately - overriding any clock or data input activity - which is confirmed in the function table and timing diagrams of the SDAS198B datasheet for SN74AS109ANSR.
What package type and mounting style does SN74AS109ANSR use?
SN74AS109ANSR uses a 16-pin SOP (Small Outline Package) with NS drawing, measuring 10.4 mm × 8.1 mm × 2.00 mm, RoHS-compliant NiPdAu lead finish, and MSL Level-1 rating. It ships in large tape-and-reel format (2000 units per reel), optimized for automated surface-mount assembly without moisture sensitivity concerns.
Can SN74AS109ANSR be configured as a D-type flip-flop?
Yes, SN74AS109ANSR can operate as a D-type flip-flop by connecting the J and K inputs of each section together - effectively forming a single data input. This configuration is explicitly documented in the device description and function table of the SN74AS109ANSR datasheet, and maintains full timing compliance including setup/hold and propagation specifications.
What are the absolute maximum ratings for SN74AS109ANSR?
The absolute maximum ratings for SN74AS109ANSR are: supply voltage VCC = 7 V, input voltage VI = 7 V, and operating free-air temperature TA = −55°C to 125°C. However, the device is characterized for reliable operation only from 0°C to 70°C - exceeding these limits risks permanent damage, and functional operation outside recommended conditions is not implied.
SN74AS109ANSR 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:
- Set(Preset) and Reset
- Type:
- JK Type
- Output Type:
- Complementary
- Number of Elements:
- 2
- Number of Bits per Element:
- 1
- Clock Frequency:
- 105 MHz
- Max Propagation Delay @ V, Max CL:
- 9ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 2mA, 20mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 17 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
SN74AS109ANSR FAQ
1.How can I place an order for SN74AS109ANSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS109ANSR 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 SN74AS109ANSR reliable?
The price and inventory of SN74AS109ANSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS109ANSR is usually 5 days.
3.What payment methods are accepted for SN74AS109ANSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS109ANSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS109ANSR?
SN74AS109ANSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS109ANSR 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 SN74AS109ANSR?
For technical support, including SN74AS109ANSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS109ANSR requirements.
6.How does Aetrix verify that SN74AS109ANSR is sourced from the original manufacturer or authorized distributors?
All SN74AS109ANSR 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 SN74AS109ANSR meets industry standards.
7.What is the process for return or replacement of SN74AS109ANSR?
All SN74AS109ANSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS109ANSR, 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 SN74AS109ANSR part is unused and in its original packaging.
Return procedure for SN74AS109ANSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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