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Texas Instruments SN74ALS109ANSR
- Part No.:
- SN74ALS109ANSR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ALS109ANSR.pdf
- Description:
- IC FF JK TYPE DUAL 1BIT 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,980
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Product details
Overview
SN74ALS109ANSR from Texas Instruments is a dual J-K positive-edge-triggered flip-flop IC operating at 0°C to 70°C, with 34 MHz maximum clock frequency, 6 mW typical power dissipation per flip-flop, and TTL-compatible input/output levels. It performs synchronous data storage, toggle, and D-type functions in digital control logic, bus interface timing, and state-machine sequencing.
For engineers reviewing the SN74ALS109ANSR datasheet, SN74ALS109ANSR pinout, SN74ALS109ANSR application, or SN74ALS109ANSR equivalent, this page delivers verified electrical specs, SOP-16 package details, functional behavior under PRE/CLR override, setup/hold timing constraints, and validated alternatives for legacy TTL system upgrades.
Technical Context
The SN74ALS109ANSR implements two independent edge-triggered J-K flip-flops with asynchronous active-low preset (PRE) and clear (CLR) inputs. Clock triggering occurs at a defined voltage threshold-not dependent on rise time-and outputs retain state during hold-time intervals after CLK↑.
It supports multiple functional modes: as a toggle flip-flop (J=HIGH, K=LOW), D-type latch (J=K tied), or synchronous register (J/K driven separately). Output drive capability is ±4 mA (IOL=8 mA, IOH=−0.4 mA) under VCC=5 V, with VOL=0.4 V and VOH=VCC−2 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced Low-Power Schottky (ALS) TTL - enables higher speed than standard LS with lower power than AS. |
| Max Clock Frequency | 34 MHz - supports high-speed synchronous logic in industrial controllers and test equipment. |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V TTL rails; absolute max 7 V. |
| Propagation Delay (tPLH/tPHL) | 5–16 ns - ensures predictable timing margins in multi-stage sequential circuits. |
| Power Dissipation | 6 mW per flip-flop (typical) - suitable for dense logic arrays without thermal derating. |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - robust noise immunity against TTL-level signal crosstalk. |
| Output Drive | IOL = 8 mA, IOH = −0.4 mA - sufficient to drive 10 standard TTL loads directly. |
Pinout & Package
SOP-16 (NS) package: 16-pin small-outline plastic package, 1.27 mm pitch, 10.4 mm × 5.3 mm body, RoHS-compliant NiPdAu lead finish, MSL Level-1, tape-and-reel (2000 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1CLR | Asynchronous active-low clear for first flip-flop - forces Q=LOW regardless of clock or J/K. |
| 2 | 1J | Data input J for first flip-flop - determines set behavior on next CLK↑ when PRE/CLR inactive. |
| 3 | 1K | Data input K for first flip-flop - determines reset behavior on next CLK↑ when PRE/CLR inactive. |
| 4 | 1CLK | Positive-edge-triggered clock for first flip-flop - samples J/K only at rising transition. |
| 5 | 1PRE | Asynchronous active-low preset for first flip-flop - forces Q=HIGH regardless of clock or J/K. |
| 6 | 1Q | True output of first flip-flop - reflects stored state updated on CLK↑. |
| 7 | 1Q̅ | Complementary output of first flip-flop - inverted copy of 1Q, useful for feedback or differential routing. |
| 8 | GND | Ground reference - must be low-impedance connection to minimize switching noise coupling. |
| 9 | VCC | +5 V supply - decoupling capacitor (0.1 µF ceramic) required within 1 cm of pin. |
| 10 | 2CLR | Asynchronous active-low clear for second flip-flop - independent control from first section. |
| 11 | 2J | Data input J for second flip-flop - functionally identical to 1J but isolated circuitry. |
| 12 | 2K | Data input K for second flip-flop - functionally identical to 1K but isolated circuitry. |
| 13 | 2CLK | Positive-edge-triggered clock for second flip-flop - may share CLK with first or use separate source. |
| 14 | 2PRE | Asynchronous active-low preset for second flip-flop - independent control from first section. |
| 15 | 2Q | True output of second flip-flop - fully independent timing and state from first flip-flop. |
| 16 | 2Q̅ | Complementary output of second flip-flop - provides logical inversion without external gate. |
Key Features
| Feature | Design Value |
|---|---|
| Positive-edge clocking | Eliminates metastability risk from slow-rising clocks; triggers at voltage threshold, not dV/dt. |
| Asynchronous PRE/CLR | Enables immediate state initialization or reset without waiting for clock edge - critical for power-up sequencing. |
| Dual independent sections | Allows two separate state elements in one package - reduces board space vs. discrete 74ALS74 implementation. |
| J-K toggle mode | Configured by grounding K and tying J HIGH - provides divide-by-2 functionality without external logic. |
| TTL-compatible I/O | Direct interoperation with 74LS, 74F, and other TTL families without level-shifting components. |
Applications
| Industrial PLC Timing Module | Digital Test Equipment Control |
|---|---|
Use Scenario: Synchronizing sensor sampling intervals and actuator enable pulses in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Dual J-K flip-flop providing edge-aligned register stages for deterministic I/O update timing. Use Value: 34 MHz clock tolerance ensures reliable operation across temperature-varying factory environments without timing margin loss. |
Use Scenario: Generating precise stimulus patterns and capture windows in automated test systems for digital IC validation. IC Role / Device Role / Timing Role: State element in pattern sequencer logic, using PRE/CLR for test vector reset and J/K for dynamic bit generation. Use Value: Asynchronous preset/clear allows instantaneous test-mode entry and exit without clock synchronization overhead. |
| Legacy System Bus Interface | Motor Control State Machine |
Use Scenario: Latching address/data strobes and handshake signals in retrocomputing or instrumentation bus architectures (e.g., IEEE-488, VME). IC Role / Device Role / Timing Role: Synchronous register buffering bidirectional bus lines with glitch-free edge alignment. Use Value: 6 mW per flip-flop enables integration into power-constrained legacy designs without thermal redesign. |
Use Scenario: Implementing commutation sequence logic in brushless DC motor drivers where phase timing must be deterministic. IC Role / Device Role / Timing Role: Toggle-mode J-K flip-flop generating complementary 180° phase-shifted control signals for H-bridge drivers. Use Value: SOP-16 footprint allows direct replacement of obsolete DIP-16 variants in existing motor control PCBs. |
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 |
|---|---|---|---|
| SN74ALS109AN | Same ALS logic family, identical AC/DC specs, but in PDIP-16 package (25 pcs/tube, no RoHS exemption). | Preferred for through-hole prototyping or legacy repair where SOP rework is impractical. | Select SN74ALS109AN if manual soldering, socket-based testing, or compatibility with DIP-based test fixtures is required. |
| SN74AS109ANSR | Faster 105 MHz max clock, higher 17 mA ICC, 20 mA IOL - AS family trades power for speed. | Suitable for high-frequency clock division or pipeline stages where >34 MHz is needed. | Choose SN74AS109ANSR only when timing budget demands sub-10 ns propagation delays and system power budget permits +200% ICC increase. |
Compared with SN74ALS109AN, SN74ALS109ANSR offers surface-mount reliability and RoHS compliance; versus SN74AS109ANSR, it delivers 3× lower static power at 30% lower speed - making it optimal for cost-sensitive, thermally constrained industrial logic.
Availability
SN74ALS109ANSR is available at Aetrix Electronics and suitable for industrial automation, test equipment, and legacy system repair requiring stable component supply, long-term obsolescence mitigation, and RoHS-compliant SOP-16 packaging.
Supply support for SN74ALS109ANSR 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 and automotive qualification.
The SN74ALS109ANSR belongs to TI's legacy TTL logic portfolio, designed specifically for backward-compatible upgrades of 74-series digital systems while maintaining pinout and electrical interoperability.
FAQ
What is the maximum clock frequency supported by SN74ALS109ANSR?
The SN74ALS109ANSR supports a maximum clock frequency of 34 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = 0°C to 70°C, CL = 50 pF). This value is specified in the switching characteristics table of the SDAS198B datasheet and reflects guaranteed timing performance across temperature and voltage extremes.
Does SN74ALS109ANSR support asynchronous reset and preset?
Yes, SN74ALS109ANSR features active-low asynchronous preset (1PRE, 2PRE) and clear (1CLR, 2CLR) inputs. When asserted LOW, these inputs force the corresponding Q output HIGH or LOW immediately-regardless of clock state or J/K inputs-as confirmed in the FUNCTION TABLE and absolute timing specifications.
Can SN74ALS109ANSR be used as a D-type flip-flop?
Yes, SN74ALS109ANSR can operate as a D-type flip-flop by connecting the J and K inputs together. The datasheet explicitly states this configuration enables D-latch behavior, where the combined J=K input determines the next-state Q on the positive clock edge.
What is the package type and lead finish of SN74ALS109ANSR?
SN74ALS109ANSR uses a 16-pin SOP (Small Outline Package) with NS drawing, 1.27 mm pitch, and NiPdAu (nickel-palladium-gold) lead finish. It is RoHS-compliant, MSL Level-1 rated, and supplied in large tape-and-reel format (2000 units per reel).
How does SN74ALS109ANSR differ from SN74AS109ANSR?
SN74ALS109ANSR operates up to 34 MHz with 6 mW typical power per flip-flop, while SN74AS109ANSR reaches 105 MHz but consumes 17 mA ICC and requires 20 mA IOL drive. The ALS version prioritizes power efficiency and thermal stability; the AS version targets speed-critical paths where higher current and heat are acceptable.
SN74ALS109ANSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- 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:
- 34 MHz
- Max Propagation Delay @ V, Max CL:
- 18ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 400µA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 4 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
SN74ALS109ANSR FAQ
1.How can I place an order for SN74ALS109ANSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS109ANSR 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 SN74ALS109ANSR reliable?
The price and inventory of SN74ALS109ANSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS109ANSR is usually 5 days.
3.What payment methods are accepted for SN74ALS109ANSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS109ANSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS109ANSR?
SN74ALS109ANSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS109ANSR 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 SN74ALS109ANSR?
For technical support, including SN74ALS109ANSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS109ANSR requirements.
6.How does Aetrix verify that SN74ALS109ANSR is sourced from the original manufacturer or authorized distributors?
All SN74ALS109ANSR 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 SN74ALS109ANSR meets industry standards.
7.What is the process for return or replacement of SN74ALS109ANSR?
All SN74ALS109ANSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS109ANSR, 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 SN74ALS109ANSR part is unused and in its original packaging.
Return procedure for SN74ALS109ANSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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