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Texas Instruments SN74AS109AN
- Part No.:
- SN74AS109AN
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74AS109AN.pdf
- Description:
- IC FF JK TYPE DUAL 1BIT 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,059
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Product details
Overview
SN74AS109AN from Texas Instruments is a dual positive-edge-triggered J-K flip-flop in a 16-pin plastic DIP (N) package, operating from 0°C to 70°C. It delivers 105 MHz maximum clock frequency, 17 mA typical ICC at 5.5 V, and supports independent preset/clear with asynchronous control. It is used in high-speed digital logic sequencing, state machine design, and clock-domain synchronization in industrial control systems.
For engineers reviewing the SN74AS109AN datasheet, SN74AS109AN pinout, SN74AS109AN application, or SN74AS109AN equivalent, this page provides verified functional identity, validated timing parameters, confirmed package mapping, real-world use scenarios, and two technically documented alternative parts for logic-level compatibility assessment.
Technical Context
This device implements two independent J-K flip-flops with positive-edge clock triggering, where output transitions occur strictly on the rising edge of CLK and are unaffected by clock rise time. Each flip-flop features active-low asynchronous PRE and CLR inputs that override clocked operation, enabling immediate set/reset independent of clock phase.
It supports multiple functional modes: as a toggle flip-flop (J=1, K=1), D-type latch (J=K tied), or gated data register (J/K driven separately). Its propagation delays-tPLH/tPHL ≤9 ns (CLK→Q) and ≤8 ns (PRE/CLR→Q)-are specified under 50 pF load and 4.5–5.5 V supply, confirming suitability for sub-10 ns synchronous logic paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced Schottky (AS) TTL - enables 105 MHz operation with low power-delay product vs. ALS variants. |
| Max Clock Frequency | 105 MHz - supports high-speed counter and shift-register designs without external clock division. |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V TTL bus systems and tolerant of rail variation. |
| Output Drive | IOL = 20 mA / IOH = −2 mA - sufficient to drive 10+ standard TTL loads or interface directly with 74AS/ALS inputs. |
| Propagation Delay | tPLH/tPHL ≤9 ns (CLK→Q) - ensures tight timing margins in multi-stage synchronous pipelines. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded and industrial control applications. |
| Package Type | 16-pin PDIP (N) - through-hole mounting compatible with legacy prototyping, test fixtures, and repair workflows. |
Pinout & Package
SN74AS109AN uses a 16-pin plastic dual in-line package (PDIP-N) with 0.3-inch body width and 0.1-inch lead pitch. Pin 1 is marked by a notch or dot; leads are tin-lead (NIPDAU) finish, RoHS-compliant, and rated for wave soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1CLR | Active-low asynchronous clear for first flip-flop; forces Q1 = 0, Q1̅ = 1 when low. |
| 2 | 1J | Data input J for first flip-flop; controls set behavior on next clock edge when PRE/CLR inactive. |
| 3 | 1K | Data input K for first flip-flop; controls reset behavior on next clock edge when PRE/CLR inactive. |
| 4 | 1CLK | Positive-edge-triggered clock input for first flip-flop; transition from low to high latches J/K states. |
| 5 | 1PRE | Active-low asynchronous preset for first flip-flop; forces Q1 = 1, Q1̅ = 0 when low. |
| 6 | 1Q | True output of first flip-flop; reflects stored state after clock edge or asynchronous PRE/CLR assertion. |
| 7 | 1Q̅ | Complementary output of first flip-flop; always inverse of 1Q under valid operating conditions. |
| 8 | GND | Ground reference for all internal circuitry and I/O; must be connected to system 0 V plane. |
| 9 | VCC | Positive supply input (4.5–5.5 V); powers internal logic and output drivers. |
| 10 | 2Q̅ | Complementary output of second flip-flop; electrically isolated from first section. |
| 11 | 2PRE | Active-low asynchronous preset for second flip-flop; independent of first section's control signals. |
| 12 | 2CLK | Positive-edge-triggered clock input for second flip-flop; no shared timing path with 1CLK. |
| 13 | 2K | Data input K for second flip-flop; functionally identical to 1K but electrically isolated. |
| 14 | 2J | Data input J for second flip-flop; fully independent of 1J, supporting dual-channel operation. |
| 15 | 2CLR | Active-low asynchronous clear for second flip-flop; independent of 1CLR and non-interacting. |
| 16 | 2Q | True output of second flip-flop; maintains state until next clock edge or asynchronous assertion. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent J-K flip-flops | Enables two parallel state-storage channels on one IC-reducing board space vs. discrete single FFs. |
| Positive-edge clock triggering | Eliminates sensitivity to clock rise time; allows reliable operation with slower or noisy clock sources. |
| Asynchronous preset and clear | Permits immediate initialization or fault recovery without waiting for clock edges-critical for safety logic. |
| 105 MHz max clock frequency | Supports real-time sampling and counting up to 100+ MHz in commercial-temperature environments. |
| 20 mA sink / 2 mA source drive | Drives standard TTL loads directly; avoids need for buffer stages in mixed-logic interfacing. |
Applications
| Industrial PLC Sequencing | Digital Test Equipment Control |
|---|---|
|
Use Scenario: Implementing step-indexed state machines in programmable logic controllers for conveyor belt motion control. IC Role / Device Role / Timing Role: SN74AS109AN serves as a dual-stage register holding current step count and next-step enable signal, synchronized to a 50 MHz system clock. Use Value: Sub-10 ns propagation delay ensures deterministic state advancement across 16-step sequences with <100 ns total latency per cycle. |
Use Scenario: Generating precise stimulus patterns in automated test equipment for digital ASIC validation. IC Role / Device Role / Timing Role: SN74AS109AN acts as a pattern generator core, toggling outputs on each clock edge to produce repeating 0101/1010 test vectors. Use Value: 105 MHz clock tolerance allows direct connection to high-speed pattern clocks-eliminating PLL-based clock multiplication. |
| Legacy Bus Interface Logic | High-Speed Counter Module |
|
Use Scenario: Adapting legacy 5 V TTL bus protocols (e.g., IEEE-488 GPIB handshaking) to modern microcontroller peripherals. IC Role / Device Role / Timing Role: SN74AS109AN buffers and synchronizes handshake signals (DAV, NRFD) between microcontroller GPIO and bus transceivers. Use Value: Asynchronous PRE/CLR enables immediate bus reset on error detection-guaranteeing clean restart without clock dependency. |
Use Scenario: Building modular 4-bit binary counters for frequency measurement front-ends in spectrum analyzers. IC Role / Device Role / Timing Role: SN74AS109AN forms two cascaded 2-bit counters; Q outputs feed carry logic and display drivers. Use Value: Matched tPLH/tPHL (≤9 ns) ensures minimal skew between bit stages-preserving counter accuracy up to 100 MHz input. |
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 | Lower max clock (34 MHz), lower ICC (4 mA), higher input thresholds (VIH = 2 V). | Suitable for lower-speed, low-power systems where timing margin >30 ns is acceptable. | Select SN74ALS109AN only if system clock ≤30 MHz and power budget <5 mA per FF is critical. |
| SN74F109N | Fast TTL family; 45 MHz max clock, 22 mA ICC, 10 ns propagation delay. | Compatible with legacy F-series logic families but lacks AS-level speed and drive capability. | Choose SN74F109N only for drop-in replacement in existing F-family designs where 105 MHz is unnecessary. |
Compared with SN74ALS109AN and SN74F109N, SN74AS109AN delivers 3× higher clock rate than ALS and 2.3× higher than F-series while maintaining full pinout compatibility-making it the optimal choice for upgrading legacy 74xx109-based systems to higher throughput without PCB redesign.
Availability
SN74AS109AN is available at Aetrix Electronics and suitable for industrial PLC sequencing, digital test equipment control, legacy bus interface logic, and high-speed counter modules requiring stable component supply across extended production lifecycles.
Supply support for SN74AS109AN 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 high-reliability digital ICs.
SN74AS109AN belongs to TI's Advanced Schottky TTL logic family, designed specifically for high-speed commercial applications demanding robust noise immunity, fast switching, and direct TTL/LSTTL interoperability.
FAQ
What is the maximum clock frequency supported by SN74AS109AN?
The SN74AS109AN supports a maximum clock frequency of 105 MHz under recommended operating conditions (VCC = 4.5–5.5 V, CL = 50 pF, TA = 0°C to 70°C). This value is characterized-not production-tested-but confirmed in TI's SDAS198B datasheet revision August 1995, and applies specifically to the SN74AS109AN variant, not ALS or F-series equivalents.
Does SN74AS109AN support asynchronous reset and preset functions?
Yes, SN74AS109AN provides active-low asynchronous preset (1PRE, 2PRE) and clear (1CLR, 2CLR) inputs for both flip-flops. When asserted low, these inputs force immediate Q = 1 or Q = 0 regardless of clock or J/K states-enabling instant initialization or fault recovery without clock dependency.
What package type is used for SN74AS109AN?
SN74AS109AN uses a 16-pin plastic dual in-line package (PDIP-N) with 0.3-inch width and 0.1-inch lead pitch. It is RoHS-compliant with NIPDAU lead finish, intended for through-hole assembly, and documented in TI's PACKAGE OPTION ADDENDUM as orderable part SN74AS109AN.
Can SN74AS109AN operate with a 3.3 V supply?
No, SN74AS109AN is specified only for 4.5 V to 5.5 V operation. Its input thresholds (VIH = 2 V, VIL = 0.8 V) and output drive characteristics are optimized for 5 V TTL logic levels. Operation below 4.5 V is outside recommended conditions and may result in unreliable switching or increased propagation delay.
How does SN74AS109AN differ from SN74ALS109AN in timing performance?
SN74AS109AN offers significantly faster timing: 105 MHz max clock vs. 34 MHz for SN74ALS109AN, and propagation delays ≤9 ns (CLK→Q) vs. ≤16 ns. It also draws higher supply current (17 mA typical vs. 4 mA), reflecting its Advanced Schottky architecture optimized for speed over power efficiency.
SN74AS109AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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:
- Through Hole
- Supplier Device Package:
- 16-PDIP
SN74AS109AN FAQ
1.How can I place an order for SN74AS109AN through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS109AN 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 SN74AS109AN reliable?
The price and inventory of SN74AS109AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS109AN is usually 5 days.
3.What payment methods are accepted for SN74AS109AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS109AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS109AN?
SN74AS109AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS109AN 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 SN74AS109AN?
For technical support, including SN74AS109AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS109AN requirements.
6.How does Aetrix verify that SN74AS109AN is sourced from the original manufacturer or authorized distributors?
All SN74AS109AN 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 SN74AS109AN meets industry standards.
7.What is the process for return or replacement of SN74AS109AN?
All SN74AS109AN units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS109AN, 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 SN74AS109AN part is unused and in its original packaging.
Return procedure for SN74AS109AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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