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Texas Instruments SN74ALS109ADR
- Part No.:
- SN74ALS109ADR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74ALS109ADR.pdf
- Description:
- IC FF JK TYPE DUAL 1BIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,551
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Product details
Overview
SN74ALS109ADR from Texas Instruments is a dual J-K positive-edge-triggered flip-flop IC designed for synchronous logic control in TTL-compatible digital systems. It operates from 0°C to 70°C, supports 34 MHz maximum clock frequency, dissipates 6 mW per flip-flop at 5 V, and features independent preset (PRE) and clear (CLR) inputs that override clocked operation-used in state machines, counters, and register files.
For engineers reviewing the SN74ALS109ADR datasheet, SN74ALS109ADR pinout, SN74ALS109ADR application, or SN74ALS109ADR equivalent, key selection criteria include its ALS-family propagation delay (5–16 ns), low-power TTL compatibility, 4.5–5.5 V supply range, and SOIC-16 package suitability for space-constrained industrial control and legacy system upgrades.
Technical Context
The SN74ALS109ADR implements two fully independent J-K flip-flops with asynchronous active-low PRE and CLR inputs, enabling immediate output set/reset regardless of clock state. Each section uses positive-edge triggering on CLK, with setup time (15 ns) and hold time (0 ns) referenced to the rising edge.
Its ALS (Advanced Low-Power Schottky) architecture delivers higher speed than standard LS logic while maintaining lower power consumption than AS variants-achieving 34 MHz max clock frequency and 6 mW typical power per flip-flop at 5 V, with output drive capability of ±0.4 mA (IOH/IOL) under recommended conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky) – ensures TTL-compatible voltage thresholds and reduced power vs. LS, without AS-level current draw |
| Max Clock Frequency | 34 MHz – enables reliable operation in high-speed counters and data latching up to 29.4 ns minimum clock period |
| Supply Voltage Range | 4.5 V to 5.5 V – compatible with standard 5 V TTL rails and tolerant of nominal ±10% regulation variation |
| Propagation Delay (tPLH/tPHL) | 5–16 ns (CLK to Q) – guarantees deterministic timing margins in synchronous state machines with ≤16 ns worst-case path delay |
| Power Dissipation | 6 mW per flip-flop at 5 V – supports dense logic integration with minimal thermal impact in unheatsinked PCB layouts |
| Input Thresholds (VIH/VIL) | VIH = 2.0 V min, VIL = 0.8 V max – ensures robust noise immunity and interoperability with 74LS/74F outputs |
| Output Drive (IOL/IOH) | IOL = 4 mA / IOH = −0.4 mA – sufficient to drive 10 LS-TTL loads or interface directly with microcontroller GPIOs |
Pinout & Package
SN74ALS109ADR is supplied in a 16-pin SOIC (D) package with 1.27 mm pitch, 7.5 mm body width, and 2.00 mm max height-designed for surface-mount assembly and IPC-7351-compliant land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | 1CLR / 2CLR | Asynchronous active-low clear: forces Q = L, Q̅ = H independently of clock or J/K inputs |
| 2, 14 | 1J / 2J | Data input for set behavior when K = L and CLK↑ occurs |
| 3, 13 | 1K / 2K | Data input for reset behavior when J = L and CLK↑ occurs; enables toggle when J=K=H |
| 4, 12 | 1CLK / 2CLK | Positive-edge-triggered clock input-transition detection is voltage-level-based, not slew-rate dependent |
| 5, 11 | 1PRE / 2PRE | Asynchronous active-low preset: forces Q = H, Q̅ = L independently of clock or J/K inputs |
| 6, 10 | 1Q / 2Q | True output of respective flip-flop-drives standard TTL loads with guaranteed VOH/VOL levels |
| 7, 9 | 1Q̅ / 2Q̅ | Inverted output-provides complementary signal for differential routing or feedback paths |
| 8 | GND | Ground reference for all internal circuitry and I/O-must be low-impedance connection to minimize switching noise |
| 16 | VCC | +5 V supply rail-requires local 0.1 µF ceramic decoupling capacitor placed within 5 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent J-K flip-flops | Enables compact implementation of two-bit registers or cascaded counters without external gating logic |
| Asynchronous PRE/CLR | Allows immediate initialization or fault recovery in real-time control systems without waiting for clock edges |
| Positive-edge clock triggering | Eliminates metastability risks from slow-rising clocks and simplifies timing analysis in synchronous designs |
| ALS logic family performance | Delivers 34 MHz operation with only 6 mW per flip-flop-optimal balance of speed and power for legacy 5 V systems |
| TTL-compatible I/O thresholds | Ensures plug-and-play interoperability with 74LS, 74F, and microcontroller GPIOs without level-shifting circuitry |
Applications
| Industrial PLC Control Logic | Legacy Computer Bus Interface |
|---|---|
Use Scenario: Synchronizing sensor input sampling and actuator enable signals in programmable logic controllers with deterministic cycle timing. IC Role / Device Role / Timing Role: Dual J-K flip-flop provides edge-triggered register storage for status bits and handshake signals in parallel I/O expansion modules. Use Value: Asynchronous PRE/CLR allows immediate reset during emergency stop events, while 34 MHz clock support accommodates fast scan-cycle updates without timing violations. | Use Scenario: Managing address/data bus handshaking and control signal synchronization in retrocomputing and embedded x86-compatible systems. IC Role / Device Role / Timing Role: Acts as a clocked latch and state sequencer for WAIT, READY, and BUSREQ signal coordination between CPU and peripheral controllers. Use Value: ALS family's 6 mW per flip-flop minimizes heat buildup in densely populated backplane slots, and SOIC-16 footprint eases drop-in replacement of obsolete DIP-16 versions. |
| Test Equipment State Sequencing | Digital Signal Generator Control |
Use Scenario: Implementing finite-state machines for automated test pattern generation and response capture in benchtop instrumentation. IC Role / Device Role / Timing Role: Configured as toggle or D-type flip-flops to generate precise timing windows, pulse widths, and sequence steps in stimulus engines. Use Value: Guaranteed 15 ns setup time and 0 ns hold time simplify timing closure in multi-stage trigger chains, and complementary Q/Q̅ outputs reduce external inverters. | Use Scenario: Controlling waveform selection, frequency division, and output enable sequencing in DDS-based function generators. IC Role / Device Role / Timing Role: Provides synchronized register stages for coarse frequency tuning words and phase accumulator load control. Use Value: 34 MHz max clock frequency supports direct derivation of sub-MHz timing references from master oscillators, and TTL-compatible outputs interface cleanly with DAC control buses. |
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 |
|---|---|---|---|
| SN74AS109AD | Higher speed (105 MHz max), higher power (17 mA ICC), AS-family drive strength (20 mA IOL) | Better suited for high-frequency clock distribution or fanout-heavy loads where ALS timing margin is insufficient | Select when >34 MHz operation or stronger output drive is required; verify thermal design due to 3× higher power dissipation |
| SN74LS109N | Slower (45 MHz max), higher power (15 mW per FF), LS-family thresholds (VIH = 2.0 V, VIL = 0.8 V same) | Compatible with older LS-based boards but lacks ALS speed/power optimization | Choose for cost-sensitive legacy repairs where SOIC-16 footprint isn't mandatory and 34 MHz margin is unnecessary |
Compared with SN74AS109AD and SN74LS109N, SN74ALS109ADR offers the optimal trade-off for mid-speed industrial control: it delivers 34 MHz operation at just 6 mW per flip-flop-enabling denser logic integration without thermal derating-while retaining full pin and functional compatibility with both alternatives in SOIC-16 layout.
Availability
SN74ALS109ADR is available at Aetrix Electronics and suitable for industrial PLCs, legacy computer bus interfaces, test equipment state sequencing, and digital signal generator control requiring stable component supply across extended production lifecycles.
Supply support for SN74ALS109ADR 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 specializing in analog, embedded processing, and logic solutions with over 50 years of innovation in industrial, automotive, and communications markets.
The SN74ALS109ADR belongs to TI's legacy TTL logic portfolio, specifically engineered for reliability and interoperability in 5 V digital systems where speed, power efficiency, and long-term availability are critical-targeting industrial automation, instrumentation, and retro-computing applications.
FAQ
What is the maximum operating temperature range for the SN74ALS109ADR?
The SN74ALS109ADR is characterized for operation from 0°C to 70°C, matching the commercial temperature grade of the 74ALS logic family. This range is validated per TI's recommended operating conditions and applies to all electrical and switching specifications-including 34 MHz max clock frequency and 6 mW typical power dissipation-under continuous operation with proper PCB thermal management.
Does the SN74ALS109ADR support true toggle mode operation?
Yes, the SN74ALS109ADR supports true toggle mode: when J and K inputs are both held high, each positive clock edge toggles the Q output state. This behavior is explicitly confirmed in the device's function table and description, and requires no external feedback-making it ideal for divide-by-two circuits and binary counters without additional logic gates.
Can the SN74ALS109ADR be used as a D-type flip-flop?
Yes, the SN74ALS109ADR can function as a D-type flip-flop by connecting the J and K inputs together to form a single D input. When J = K = D, the output Q follows D on the next positive clock edge-this configuration is documented in the device description and preserves all timing parameters including 15 ns setup time and 0 ns hold time relative to CLK↑.
What package type is used for the SN74ALS109ADR?
The SN74ALS109ADR uses a 16-pin SOIC (Small Outline Integrated Circuit) package designated as 'D' by Texas Instruments, with 1.27 mm lead pitch, 7.5 mm body width, and 2.00 mm maximum height. This RoHS-compliant, NIPDAU-finished package is optimized for surface-mount assembly and matches IPC-7351 land pattern recommendations for NS0016A footprints.
Is the SN74ALS109ADR pin-compatible with other 74xx109 variants?
Yes, the SN74ALS109ADR is pin-compatible with SN74AS109AD, SN74LS109N, and SN74F109N in the SOIC-16 (D) and PDIP-16 (N) packages-the pin assignments for PRE, CLR, CLK, J, K, Q, and Q̅ are identical across these families. However, electrical characteristics (speed, drive strength, power) differ, so system-level validation is required when substituting.
SN74ALS109ADR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-SOIC
SN74ALS109ADR FAQ
1.How can I place an order for SN74ALS109ADR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS109ADR 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 SN74ALS109ADR reliable?
The price and inventory of SN74ALS109ADR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS109ADR is usually 5 days.
3.What payment methods are accepted for SN74ALS109ADR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS109ADR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS109ADR?
SN74ALS109ADR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS109ADR 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 SN74ALS109ADR?
For technical support, including SN74ALS109ADR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS109ADR requirements.
6.How does Aetrix verify that SN74ALS109ADR is sourced from the original manufacturer or authorized distributors?
All SN74ALS109ADR 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 SN74ALS109ADR meets industry standards.
7.What is the process for return or replacement of SN74ALS109ADR?
All SN74ALS109ADR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS109ADR, 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 SN74ALS109ADR part is unused and in its original packaging.
Return procedure for SN74ALS109ADR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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