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Texas Instruments SN74HC109NS
- Part No.:
- SN74HC109NS
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74HC109NS.pdf
- Description:
- IC FF JK TYPE DUAL 1BIT 16SO
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74HC109NS from Texas Instruments is a dual positive-edge-triggered JK flip-flop with asynchronous set (nSD) and reset (nRD) inputs, complementary Q/Q̅ outputs per section, and Schmitt-trigger clock inputs for noise immunity. It operates from 2 V to 6 V, supports −40 °C to +85 °C, and enables D-type operation via J–K tie-down - used in digital state machines, counters, and synchronous control logic.
For engineers reviewing the SN74HC109NS datasheet, SN74HC109NS pinout, SN74HC109NS application, or SN74HC109NS equivalent, key selection considerations include its CMOS-level input compatibility, 16-pin SOIC package, guaranteed setup/hold timing at 4.5 V, and dual independent flip-flop functionality with asynchronous control.
Technical Context
The SN74HC109NS implements two identical edge-triggered JK latches sharing no internal coupling - each with dedicated J, K, CP, SD, RD, Q, and Q̅ terminals. Its Schmitt-trigger clock input accepts slow-rising signals without false triggering, while clamped inputs allow safe interfacing to voltages exceeding VCC using current-limiting resistors.
Operation follows standard JK truth table behavior: toggle on J=K=H, hold on J=K=L, set on J=H/K=L, reset on J=L/K=H. Asynchronous SD and RD override clock action and are active-low, enabling immediate state initialization independent of clock edges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74HC high-speed CMOS - compatible with TTL output levels but CMOS input thresholds; enables mixed-voltage system interfacing |
| Supply Voltage Range | 2.0 V to 6.0 V - supports battery-powered (3.3 V) and legacy 5 V systems without level shifters |
| Propagation Delay (tpd) | 14 ns typical at VCC = 6 V, CL = 50 pF - ensures reliable timing in 30+ MHz synchronous designs |
| Maximum Clock Frequency | 35 MHz minimum at VCC = 6 V - sufficient for address latching, data sampling, and basic counter applications |
| Input Clamp Diodes | Integrated - permits direct connection to signals up to VCC + 0.5 V with external current limiting, simplifying I/O protection design |
| ESD Protection | HBM > 2000 V - meets industrial handling requirements without additional ESD circuitry |
| Operating Temperature | −40 °C to +85 °C - qualified for commercial and extended-temperature embedded control environments |
Pinout & Package
SN74HC109NS is supplied in a 16-pin plastic small-outline integrated circuit (SOIC) package (NS package), 7.5 mm wide, with standard 1.27 mm pitch and gull-wing leads. Pin 1 is marked by a beveled corner or notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 (1RD, 2RD) | Asynchronous Reset Input | Active-low; forces Q = L / Q̅ = H immediately, overriding clock and J/K states |
| 2, 14 (1J, 2J) | Synchronous Data Input | Controls next-state logic on rising clock edge; stable ≥14 ns before CP (at VCC = 6 V) |
| 3, 13 (1K, 2K) | Synchronous Data Input | Paired with J to define toggle/set/reset/hold behavior per clock edge |
| 4, 12 (1CP, 2CP) | Clock Input | Positive-edge-triggered with Schmitt-trigger hysteresis; tolerates slow edges up to 139 ns/V at 4.5 V |
| 5, 11 (1SD, 2SD) | Asynchronous Set Input | Active-low; forces Q = H / Q̅ = L immediately, overriding clock and J/K states |
| 6, 10 (1Q, 2Q) | True Output | Non-inverted registered output; drives standard CMOS loads up to 5.2 mA sink/source |
| 7, 9 (1Q̅, 2Q̅) | Complement Output | Inverted registered output; provides simultaneous true/complement for bus arbitration or differential signaling |
| 8 (GND) | Ground Reference | 0 V return path for all internal logic and I/O; must be low-impedance for noise immunity |
| 16 (VCC) | Supply Voltage | Primary power rail; decoupling capacitor (100 nF) required within 10 mm of pin for stable operation |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent JK sections | Enables compact implementation of two-bit registers or cascaded counters without inter-chip routing |
| J–K tie-down for D-type mode | Eliminates need for external inverters when used as edge-triggered D flip-flops in data capture circuits |
| Schmitt-trigger clock input | Rejects noise on clock lines with rise/fall times up to 139 ns/V - critical in noisy industrial PLC backplanes |
| Input clamp diodes | Allows safe interface to 5 V logic in 3.3 V systems using series resistors, reducing BOM count |
| JEDEC Std 7A compliance | Ensures interoperability with legacy 74-series logic families and standardized test methodologies |
Applications
| Serial Data Synchronization | Programmable Counter Control |
|---|---|
Use Scenario: Capturing asynchronous serial data bits (e.g., UART RX line) into a synchronous domain for error checking or buffering. IC Role / Device Role / Timing Role: SN74HC109NS acts as a metastability-hardened synchronizer stage, using dual flip-flops in series to reduce failure probability. Use Value: Reduces bit-error rate in cross-clock-domain transfers by leveraging asynchronous set/reset for forced alignment and edge-triggered sampling. | Use Scenario: Implementing a 2-bit binary up/down counter in a microcontroller peripheral where software control of direction and enable is required. IC Role / Device Role / Timing Role: SN74HC109NS provides the core storage and toggle logic; J/K inputs driven by MCU GPIO to select count mode (up/down/hold). Use Value: Offloads timing-critical counting from firmware, enabling deterministic response to external events at up to 35 MHz. |
| State Machine Register | Bus Arbitration Logic |
Use Scenario: Storing current state in a 4-state finite-state machine (FSM) for motor control sequencing or protocol handshaking. IC Role / Device Role / Timing Role: SN74HC109NS holds two state bits; Q/Q̅ outputs feed combinational logic that determines next-state J/K values on each clock. Use Value: Enables fully synchronous, glitch-free state transitions with predictable setup/hold margins across temperature. | Use Scenario: Managing shared resource access between two processors or peripherals on a common data bus. IC Role / Device Role / Timing Role: SN74HC109NS stores grant status (Q = granted, Q̅ = denied); J/K controlled by request signals, CP synchronized to bus clock. Use Value: Prevents bus contention by ensuring only one master gains access per cycle, with hardware-enforced mutual exclusion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual JK flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT109N | TTL-compatible inputs (VIH = 2.0 V min), otherwise identical pinout and function | Better suited for mixed 5 V TTL/CMOS systems where input drive strength or voltage margin is constrained | Select SN74HCT109N when interfacing directly to legacy 74LS outputs without level translation |
| MC74HC109ADR2G | Identical electrical specs; manufactured by ON Semiconductor in SOIC-16 (same NS footprint) | No functional difference; used where second-source supply chain diversification is required | Choose MC74HC109ADR2G for dual-sourcing assurance without layout or firmware changes |
Compared with SN74HC109NS, SN74HCT109N offers improved noise margin with TTL inputs but slightly higher ICC; MC74HC109ADR2G delivers identical performance with alternate logistics traceability - both require no PCB modifications and support drop-in replacement in existing SOIC-16 footprints.
Availability
SN74HC109NS is available at Aetrix Electronics and suitable for industrial control panels, test equipment interfaces, and legacy system upgrades requiring stable component supply and long-term obsolescence management.
Supply support for SN74HC109NS 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 global manufacturing and distribution infrastructure.
The SN74HC109NS belongs to TI's 74HC logic family, designed for low-power, high-noise-immunity digital control in commercial and industrial applications where reliability and broad voltage operation are essential.
FAQ
What is the maximum clock frequency supported by the SN74HC109NS?
The SN74HC109NS supports a minimum maximum clock frequency of 35 MHz at VCC = 6.0 V and CL = 50 pF. At 4.5 V, it operates up to 30 MHz, and at 2.0 V, the limit drops to 6 MHz. These values are specified across −40 °C to +85 °C and assume proper signal integrity and load conditions - actual system-level frequency may be lower due to board-level parasitics or timing margins.
Can the SN74HC109NS be used as a D-type flip-flop?
Yes, the SN74HC109NS can operate as a D-type flip-flop by connecting the J and K inputs together on each section. When J = K = D, the output toggles only when D = H and holds when D = L - matching D-flip-flop behavior. This configuration eliminates external inverters and is commonly used in data latching applications where simplicity and pin count matter.
Does the SN74HC109NS have built-in ESD protection?
Yes, the SN74HC109NS includes on-chip ESD protection rated to >2000 V per Human Body Model (HBM) and >200 V per Machine Model (MM), as defined by JESD22-A114F and JESD22-A115-A. This level of protection meets standard handling requirements for automated assembly and bench-level development without requiring external TVS devices.
What is the purpose of the Schmitt-trigger input on the SN74HC109NS clock pin?
The Schmitt-trigger input on the SN74HC109NS clock pin provides hysteresis (typically ~0.8 V at 4.5 V), making it highly tolerant of slow or noisy clock edges. This prevents multiple triggering from slowly rising signals - critical in applications like mechanical switch debouncing, long-trace clock distribution, or low-frequency oscillator interfaces where edge slew rates fall below 139 ns/V.
Is the SN74HC109NS pin-compatible with other 74xx109 variants?
Yes, the SN74HC109NS is pin-compatible with SN74HCT109N, SN74LS109N, and MC74HC109ADR2G in the 16-pin SOIC (NS) package. All share identical pin assignments for J, K, CP, SD, RD, Q, Q̅, VCC, and GND. However, logic thresholds, propagation delays, and drive strength differ - verify timing and voltage compatibility before substitution.
SN74HC109NS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 16-SOIC (0.209", 5.30mm Width)
- 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:
- 60 MHz
- Max Propagation Delay @ V, Max CL:
- 30ns @ 6V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 3 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
SN74HC109NS FAQ
1.How can I place an order for SN74HC109NS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC109NS 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 SN74HC109NS reliable?
The price and inventory of SN74HC109NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC109NS is usually 5 days.
3.What payment methods are accepted for SN74HC109NS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC109NS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC109NS?
SN74HC109NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC109NS 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 SN74HC109NS?
For technical support, including SN74HC109NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC109NS requirements.
6.How does Aetrix verify that SN74HC109NS is sourced from the original manufacturer or authorized distributors?
All SN74HC109NS 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 SN74HC109NS meets industry standards.
7.What is the process for return or replacement of SN74HC109NS?
All SN74HC109NS units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC109NS, 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 SN74HC109NS part is unused and in its original packaging.
Return procedure for SN74HC109NS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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