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Texas Instruments CD74HCT109M
- Part No.:
- CD74HCT109M
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74HCT109M.pdf
- Description:
- IC FF JK TYPE DUAL 1BIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,140
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Product details
Overview
CD74HCT109M from Texas Instruments is a dual positive-edge-triggered J-K flip-flop with asynchronous active-low set (S) and reset (R) inputs, operating at 4.5V–5.5V supply voltage, delivering 54MHz maximum clock frequency at VCC = 5V and CL = 15pF, and rated for -55°C to +125°C industrial/military temperature range. It serves as a synchronous state-storage element in digital control logic, serial data registers, and counter stages.
For engineers reviewing the CD74HCT109M datasheet, CD74HCT109M pinout, CD74HCT109M application, or CD74HCT109M equivalent, key selection criteria include LSTTL-compatible input thresholds (VIL ≤ 0.8V, VIH ≥ 2.0V), guaranteed propagation delay ≤17ns (CP→Q, CL = 15pF), dual independent flip-flop architecture with Schmitt-trigger clock inputs, and SOIC-16 packaging for high-density PCB layouts.
Technical Context
The CD74HCT109M implements two independent edge-triggered J-K flip-flops sharing no internal coupling-each with dedicated J, K, CP, S, R, Q, and Q̅ terminals. Its HCT logic family ensures direct compatibility with legacy TTL signal levels while maintaining CMOS power efficiency and noise immunity (NIL/NIH = 30% of VCC).
State transitions occur on the low-to-high clock edge; asynchronous S and R override clock action and force Q high or low respectively. Simultaneous assertion of both S and R yields defined high outputs, but simultaneous deassertion creates an undefined output condition-requiring external synchronization or reset sequencing in critical systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT: TTL-compatible input thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V) enable direct interfacing with 5V TTL without level-shifting. |
| Supply Voltage Range | 4.5V–5.5V: Ensures stable operation across standard 5V ±5% rails and rejects supply ripple up to ±0.5V. |
| Max Clock Frequency | 54MHz at VCC = 5V, CL = 15pF: Supports high-speed synchronous logic in counters, shift registers, and state machines. |
| Propagation Delay (CP→Q) | 17ns typical (CL = 15pF): Enables precise timing alignment in multi-stage sequential circuits with sub-20ns budget. |
| Operating Temperature | -55°C to +125°C: Qualified for aerospace, defense, and under-hood automotive applications requiring extended thermal margin. |
| Input Capacitance | 10pF max: Minimizes capacitive loading on driving gates and preserves signal integrity in fanout-critical buses. |
| Quiescent Current | ≤80µA over full temperature range: Reduces static power in battery-backed or always-on control subsystems. |
Pinout & Package
CD74HCT109M is housed in a 16-pin Small Outline Integrated Circuit (SOIC) package (Package Drawing D), with 1.27mm lead pitch, JEDEC MS-012 compliant footprint, and moisture sensitivity level (MSL) 1 rating for unlimited floor life at ≤30°C/60% RH.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | 1R, 2R (Active-Low Reset) | Asynchronous reset: Forces Q = 0 and Q̅ = 1 regardless of clock or J/K state; requires pull-up for inactive state. |
| 2, 3, 4, 13, 14 | 1J, 1K, 1CP, 2J, 2K | Data and clock inputs: J/K define next-state logic; CP triggers sampling on rising edge; all accept TTL-level signals. |
| 5, 11 | 1S, 2S (Active-Low Set) | Asynchronous set: Forces Q = 1 and Q̅ = 0 independently of clock; must be held high during normal operation. |
| 6, 7, 12, 16 | 1Q, 1Q̅, 2Q, 2Q̅ | Complementary outputs: Provide true and inverted latched states per flip-flop; drive up to 10 LSTTL loads. |
| 8 | GND | Power return reference: Requires low-inductance connection to system ground plane to minimize switching noise coupling. |
| 16 | VCC | Positive supply: Must be decoupled with 0.1µF ceramic capacitor placed within 5mm of pin to suppress high-frequency transients. |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger clock inputs | Rejects slow-rising or noisy clock edges by providing hysteresis-ensuring clean, jitter-free triggering even with >100ns rise times. |
| Asynchronous set/reset | Enables immediate state initialization or emergency shutdown without waiting for clock edge-critical for fail-safe control sequences. |
| LSTTL input compatibility | Eliminates need for external level translators when interfacing with legacy 74LS-series logic, reducing BOM count and board area. |
| Balanced propagation delays | Guarantees matched tPLH/tPHL (≤2ns skew) between Q and Q̅ outputs-essential for differential signaling and metastability mitigation. |
| Wide temperature range | Validated operation from -55°C to +125°C supports deployment in uncontrolled environments like engine compartments or satellite payloads. |
Applications
| Industrial PLC Timing Modules | Avionics Data Synchronizers |
|---|---|
Use Scenario: Synchronizing sensor sampling clocks across multiple I/O modules in a programmable logic controller rack. IC Role / Device Role / Timing Role: Dual J-K flip-flop acts as a synchronized latch and edge detector-capturing status changes from discrete inputs on rising clock edges while enabling reset-on-alarm functionality. Use Value: Asynchronous reset allows immediate fault recovery without cycle interruption; 54MHz fMAX supports 100kHz scan rates with timing margin for deterministic response. |
Use Scenario: Aligning ARINC 429 bus receive frames across redundant flight control computers. IC Role / Device Role / Timing Role: Each flip-flop stores one bit of frame validity flag; Schmitt-trigger CP inputs reject EMI-induced clock glitches common in aircraft wiring harnesses. Use Value: -55°C to +125°C rating ensures reliability in pressurized cabin and avionics bay environments; LSTTL compatibility simplifies integration with legacy MIL-STD-1553 interface logic. |
| Automotive Powertrain Control | Test Equipment Pattern Generators |
Use Scenario: Debouncing camshaft position sensor signals before feeding to microcontroller ADC trigger logic. IC Role / Device Role / Timing Role: Configured as toggle flip-flop (J=K=1) to divide noisy crank signal frequency; S/R pins used for software-initiated calibration reset. Use Value: 10pF input capacitance minimizes loading on high-impedance sensor outputs; 80µA ICC enables low-power sleep mode retention in ECU standby states. |
Use Scenario: Generating precise, repeatable stimulus waveforms for IC functional validation in ATE systems. IC Role / Device Role / Timing Role: Cascaded CD74HCT109M units form 4-bit binary counters and sequence controllers-driving pattern memory address lines with glitch-free transitions. Use Value: Matched tPLH/tPHL ensures <2ns skew between adjacent bits-critical for setup/hold compliance in high-speed memory access; SOIC-16 allows dense layout in modular test head designs. |
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 |
|---|---|---|---|
| SN74HCT109N | Same HCT logic family, identical electrical specs, but in PDIP-16 package (larger footprint, higher θJA = 67°C/W). | Preferred for prototyping or through-hole assembly; unsuitable for space-constrained PCBs requiring SOIC density. | Select SN74HCT109N only when manual soldering or breadboard evaluation is required. |
| CD74HC109M | Pin-compatible HC variant: wider 2V–6V supply range but lacks TTL input compatibility (VIH min = 1.5V at 2V, 3.15V at 4.5V). | Used where mixed-voltage systems exist (e.g., 3.3V logic driving 5V peripherals); incompatible with pure 5V TTL sources. | Choose CD74HC109M only if supply flexibility outweighs need for guaranteed LSTTL interoperability. |
Compared with CD74HCT109M, SN74HCT109N trades miniaturization for ease of handling and thermal performance, while CD74HC109M sacrifices TTL compatibility for broader voltage operation-making CD74HCT109M the optimal choice for robust 5V industrial control where signal integrity and legacy interface assurance are mandatory.
Availability
CD74HCT109M is available at Aetrix Electronics and suitable for industrial PLC timing modules, avionics data synchronizers, and automotive powertrain control systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HCT109M 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 logic families.
The CD74HCT109M belongs to TI's 74HCT logic series-designed specifically for seamless migration from bipolar TTL into lower-power, higher-noise-immunity CMOS-based control systems in harsh-environment applications.
FAQ
What is the maximum clock frequency supported by CD74HCT109M?
The CD74HCT109M supports a maximum clock frequency of 54MHz when operated at VCC = 5V with a 15pF load capacitance and ambient temperature of 25°C. At full temperature range (-55°C to +125°C), the guaranteed minimum fMAX is 18MHz per datasheet specifications, ensuring reliable timing in extreme environments.
Does CD74HCT109M require external pull-up resistors on its set and reset pins?
Yes, CD74HCT109M features active-low asynchronous set (1S, 2S) and reset (1R, 2R) inputs that must be held high during normal operation. External 4.7kΩ pull-up resistors to VCC are recommended to ensure defined logic-high states and prevent unintended triggering due to floating inputs.
Can CD74HCT109M operate with a 3.3V supply voltage?
No, CD74HCT109M is specified only for 4.5V to 5.5V operation. Applying 3.3V violates the absolute minimum supply requirement and will result in undefined output behavior, increased propagation delay, and potential failure to meet VIH/VIL thresholds for TTL compatibility.
How does the Schmitt-trigger clock input benefit CD74HCT109M in noisy environments?
The Schmitt-trigger clock input on CD74HCT109M provides built-in hysteresis (~0.5V at 5V), rejecting slow-rising edges and high-frequency noise on the CP line. This prevents false triggering in electrically noisy settings such as motor drives or RF-rich enclosures-ensuring only clean, monotonic transitions cause state changes.
Is CD74HCT109M pin-compatible with CD74HC109M?
Yes, CD74HCT109M and CD74HC109M share identical pinouts, package dimensions (SOIC-16), and terminal functions. However, they differ in input threshold specifications-CD74HCT109M guarantees TTL compatibility (VIH ≥ 2.0V), while CD74HC109M requires higher VIH at lower voltages and cannot reliably interface with standard 5V TTL outputs.
CD74HCT109M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 54 MHz
- Max Propagation Delay @ V, Max CL:
- 40ns @ 4.5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 4mA, 4mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 10 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
CD74HCT109M FAQ
1.How can I place an order for CD74HCT109M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT109M 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 CD74HCT109M reliable?
The price and inventory of CD74HCT109M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT109M is usually 5 days.
3.What payment methods are accepted for CD74HCT109M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT109M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT109M?
CD74HCT109M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT109M 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 CD74HCT109M?
For technical support, including CD74HCT109M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT109M requirements.
6.How does Aetrix verify that CD74HCT109M is sourced from the original manufacturer or authorized distributors?
All CD74HCT109M 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 CD74HCT109M meets industry standards.
7.What is the process for return or replacement of CD74HCT109M?
All CD74HCT109M units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT109M, 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 CD74HCT109M part is unused and in its original packaging.
Return procedure for CD74HCT109M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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