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Texas Instruments SN74AS109ADRG4
- Part No.:
- SN74AS109ADRG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74AS109ADRG4.pdf
- Description:
- IC FF JK TYPE DUAL 1BIT 16SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74AS109ADRG4 from Texas Instruments is a dual positive-edge-triggered J-K flip-flop IC operating at 0°C to 70°C, supporting 105 MHz maximum clock frequency, 17 mA typical ICC supply current, and 20 mA output sink capability in a 16-pin SOIC (D) package. It performs synchronous data latching, toggle, and D-type functions in digital control logic and state-machine circuits.
For engineers reviewing the SN74AS109ADRG4 datasheet, SN74AS109ADRG4 pinout, SN74AS109ADRG4 application, or SN74AS109ADRG4 equivalent, key selection factors include its high-speed AS-family propagation delay (2.5–9 ns), TTL-compatible input thresholds (VIL = 0.8 V), rail-to-rail output swing under load, and compatibility with legacy 74-series board layouts requiring dual J-K functionality.
Technical Context
This device implements two independent J-K flip-flops with asynchronous preset (PRE) and clear (CLR) inputs active-low, enabling immediate state override regardless of clock edge. Each flip-flop samples J and K inputs on the rising edge of CLK only when PRE and CLR are high, satisfying setup (tsu = 2 ns) and hold (th = 0 ns) timing constraints.
The SN74AS109ADRG4 uses bipolar Schottky (AS) technology for fast switching and low propagation skew between Q and Q̅ outputs. Its output stage delivers ±2 mA high-level and 20 mA low-level drive into standard TTL loads, with VOH ≥ VCC−2 V and VOL ≤ 0.5 V at IOL = 20 mA - critical for noise-immune inter-stage interfacing in high-density logic systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | TTL-compatible Advanced Schottky (AS), ensuring interoperability with 74LS/74ALS and driving capability beyond standard TTL. |
| Max Clock Frequency | 105 MHz - enables use in high-speed counters, shift registers, and clock-domain synchronization up to 9.5 ns period. |
| Propagation Delay (tPLH/tPHL) | 2.5–9 ns - supports sub-10 ns timing margins in pipeline stages and synchronous state machines. |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with regulated +5 V rails and tolerant of transient droop during heavy switching. |
| Output Drive Strength | 20 mA sink / −2 mA source - sufficient to directly drive multiple 74-series inputs or small LED indicators without buffering. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade industrial control, test equipment, and computing peripheral logic. |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - provides robust noise margin against ground bounce and crosstalk in mixed-signal PCB environments. |
Pinout & Package
SN74AS109ADRG4 is housed in a 16-pin SOIC (D) package, 7.5 mm wide, with 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, and moisture sensitivity level (MSL) 1 (unlimited floor life at <30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | 1CLR / 2CLR | Asynchronous active-low clear for Flip-Flop 1 and 2 - forces Q = L, Q̅ = H independently of clock or J/K states. |
| 2, 14 | 1J / 2J | Data input for set condition - when PRE and CLR high, J = H and K = L sets Q = H on next CLK↑. |
| 3, 13 | 1K / 2K | Data input for reset condition - when PRE and CLR high, J = L and K = H resets Q = L on next CLK↑. |
| 4, 12 | 1CLK / 2CLK | Positive-edge-triggered clock input - transition from L to H transfers validated J/K data to outputs; edge-sensitive, not slew-rate dependent. |
| 5, 11 | 1PRE / 2PRE | Asynchronous active-low preset - forces Q = H, Q̅ = L independently of clock or J/K states. |
| 6, 10 | 1Q / 2Q | True output of Flip-Flop 1 and 2 - complements logic state of corresponding J/K inputs sampled at CLK↑ when PRE/CLR inactive. |
| 7, 9 | 1Q̅ / 2Q̅ | Inverted output - provides complementary signal for differential routing, enable/disable logic, or toggle-mode feedback. |
| 8 | GND | Power return reference - must be low-inductance connection to minimize ground bounce affecting timing margins. |
| 16 | VCC | +5 V supply - requires local 0.1 µF ceramic decoupling adjacent to pin to suppress high-frequency supply noise. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent J-K flip-flops | Enables compact implementation of two-bit registers, binary counters, or parallel-load shift registers without external gating. |
| Asynchronous PRE/CLR per flip-flop | Allows deterministic initialization or fault recovery in real-time control systems without waiting for clock edges. |
| Toggle and D-type configuration support | J=K=H yields toggle mode; J=K tied together yields D-type behavior - increases functional flexibility per device. |
| High-speed AS logic family | Delivers 105 MHz operation with sub-10 ns delays - outperforms ALS variants by >3× in clock rate for same power envelope. |
| TTL-compatible voltage thresholds | Accepts standard 0.8 V/2.0 V logic levels and drives legacy TTL loads directly - eliminates level-shifter requirements in retrofits. |
Applications
| Industrial PLC Sequencing | Digital Test Equipment Counters |
|---|---|
Use Scenario: Synchronizing multi-axis motion commands in programmable logic controllers where deterministic state transitions are required across 16+ I/O channels. IC Role / Device Role / Timing Role: Dual J-K flip-flop providing edge-triggered register storage for step-and-direction signals, with asynchronous CLR used for emergency stop assertion. Use Value: 105 MHz clock tolerance allows oversampling of encoder inputs at 50 MHz, improving position resolution by 2× versus ALS-family alternatives. | Use Scenario: Building modular frequency dividers and event counters in automated test systems measuring pulse widths down to 10 ns. IC Role / Device Role / Timing Role: Configured as toggle flip-flops to implement divide-by-2 chains; CLK inputs driven by precision oscillator, Q outputs feed subsequent stages. Use Value: 2.5 ns tPLH ensures <5 ns cumulative jitter per stage, maintaining sub-100 ps timing accuracy over 8-stage cascades. |
| Legacy System Logic Retrofit | Communications Protocol State Machines |
Use Scenario: Replacing obsolete 74S112 or 74F112 devices in avionics maintenance test adapters where board space and pinout compatibility are constrained. IC Role / Device Role / Timing Role: Drop-in replacement for dual J-K function with identical 16-pin SOIC footprint and TTL-compatible signaling. Use Value: SOIC-16 package matches original layout; 17 mA ICC enables direct substitution without thermal derating or heatsinking modifications. | Use Scenario: Managing handshaking states in UART-to-USB bridge firmware where hardware flow control signals (RTS/CTS) require glitch-free edge detection. IC Role / Device Role / Timing Role: Used as synchronized edge detectors - J=K=H, PRE/CLR controlled by input strobes to capture metastable transitions cleanly. Use Value: 0 ns hold time (th) eliminates need for external synchronizer chains, reducing BOM count and PCB area by 30% versus discrete solutions. |
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 |
|---|---|---|---|
| SN74ALS109AD | Lower max clock (34 MHz), higher tsu (15 ns), 4 mA IOL, 4 mA ICC - AS family offers 3× speed and 4× drive vs ALS. | Suitable for cost-sensitive, lower-speed control logic where timing margins exceed 30 ns. | Select SN74ALS109AD only if system clock ≤25 MHz and power budget <5 mA per flip-flop is mandatory. |
| SN74F112N | Fast TTL variant: 60 MHz max, 10 ns tPLH, 20 mA IOL, but no guaranteed 0 ns th and wider VIL range (0.8 V vs F-series 0.5 V). | Better for mixed-logic systems with older 74F peripherals needing tighter input noise immunity. | Choose SN74F112N when interfacing with legacy 74F bus transceivers and board layout cannot accommodate AS-family's stricter VIL. |
Compared with SN74ALS109AD and SN74F112N, SN74AS109ADRG4 delivers the highest clock rate and lowest propagation delay in the 74xx109 family, making it optimal for new designs targeting >50 MHz operation while retaining full pin and functional compatibility.
Availability
SN74AS109ADRG4 is available at Aetrix Electronics and suitable for industrial automation, test instrumentation, and legacy system upgrades requiring stable component supply, long-term obsolescence mitigation, and RoHS-compliant sourcing.
Supply support for SN74AS109ADRG4 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 specializing in analog, embedded processing, and logic ICs with over 50 years of leadership in TTL and advanced logic families.
The SN74AS109ADRG4 belongs to TI's 74AS logic series, engineered for high-speed digital control applications demanding sub-10 ns timing, robust noise immunity, and seamless integration with legacy 74-series architectures.
FAQ
What is the maximum clock frequency supported by the SN74AS109ADRG4?
The SN74AS109ADRG4 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 characterized but not production-tested per MIL-STD-883 Class B; actual system-level performance depends on PCB layout, decoupling, and load capacitance. The SN74AS109ADRG4 achieves this using Advanced Schottky transistor technology to minimize internal propagation delay.
Does the SN74AS109ADRG4 support true toggle mode operation?
Yes, the SN74AS109ADRG4 supports true toggle mode: tie J and K inputs high (J = K = VCC), then apply clock pulses - each rising edge toggles Q and Q̅ outputs. This behavior is guaranteed across the full operating temperature and voltage range, with no external components required. The SN74AS109ADRG4's 0 ns hold time ensures reliable toggling even with skewed or noisy clock edges.
What are the absolute maximum ratings for SN74AS109ADRG4 supply voltage and input voltage?
The absolute maximum supply voltage (VCC) for SN74AS109ADRG4 is 7 V, and the absolute maximum input voltage (VI) is also 7 V - exceeding either rating risks permanent damage. These are stress limits only; functional operation is specified only within 4.5 V to 5.5 V for VCC and −0.5 V to VCC+0.5 V for VI. The SN74AS109ADRG4 must never be operated continuously at absolute maximum conditions, as reliability degradation may occur.
Can SN74AS109ADRG4 be used as a D-type flip-flop?
Yes, the SN74AS109ADRG4 can function as a D-type flip-flop by connecting J to the data input and K to its logical inverse (via an inverter) or by tying J and K together and feeding the data signal to both - in this configuration, Q follows D on each CLK↑. This usage is explicitly documented in the SN74AS109ADRG4 datasheet and maintains full timing compliance, including setup (2 ns) and hold (0 ns) requirements.
Is SN74AS109ADRG4 pin-compatible with SN74ALS109AD?
Yes, SN74AS109ADRG4 is pin-compatible with SN74ALS109AD: both use identical 16-pin SOIC (D) packages with matching pin functions, ordering, and mechanical dimensions. However, SN74AS109ADRG4 operates at higher speed (105 MHz vs 34 MHz) and draws more supply current (17 mA vs 4 mA), so thermal and timing validation is required when upgrading. The SN74AS109ADRG4 retains full electrical compatibility for VCC, VIH/VIL, and output drive levels.
SN74AS109ADRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- 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:
- 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-SOIC
SN74AS109ADRG4 FAQ
1.How can I place an order for SN74AS109ADRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS109ADRG4 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 SN74AS109ADRG4 reliable?
The price and inventory of SN74AS109ADRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS109ADRG4 is usually 5 days.
3.What payment methods are accepted for SN74AS109ADRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS109ADRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS109ADRG4?
SN74AS109ADRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS109ADRG4 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 SN74AS109ADRG4?
For technical support, including SN74AS109ADRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS109ADRG4 requirements.
6.How does Aetrix verify that SN74AS109ADRG4 is sourced from the original manufacturer or authorized distributors?
All SN74AS109ADRG4 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 SN74AS109ADRG4 meets industry standards.
7.What is the process for return or replacement of SN74AS109ADRG4?
All SN74AS109ADRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS109ADRG4, 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 SN74AS109ADRG4 part is unused and in its original packaging.
Return procedure for SN74AS109ADRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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