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Texas Instruments CD74HCT109MT
- Part No.:
- CD74HCT109MT
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74HCT109MT.pdf
- Description:
- IC FF JK TYPE DUAL 1BIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,575
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Product details
Overview
CD74HCT109MT from Texas Instruments is a dual positive-edge-triggered J-K flip-flop with asynchronous active-low set (S) and reset (R), operating at 4.5V–5.5V, featuring 54MHz maximum clock frequency (CL = 15pF), 15 LSTTL fanout, and -55°C to +125°C temperature range. It serves as a synchronous logic storage element in digital control circuits, state machines, and clock-domain synchronization.
For engineers reviewing the CD74HCT109MT datasheet, CD74HCT109MT pinout, CD74HCT109MT application, or CD74HCT109MT equivalent, key selection criteria include LSTTL-compatible input thresholds (VIL ≤ 0.8V, VIH ≥ 2.0V), guaranteed propagation delay ≤17ns (CP→Q, VCC = 5V, CL = 15pF), and SOIC-16 packaging for high-reliability industrial timing and control systems.
Technical Context
The CD74HCT109MT implements two independent edge-triggered J-K flip-flops sharing no internal coupling; each responds only to its dedicated clock (1CP/2CP), set (1S/2S), reset (1R/2R), J, and K inputs. Its Schmitt-trigger clock inputs reject noise on slow-rising edges, while asynchronous S/R override clock action and force Q/Q outputs to defined states regardless of CP timing.
It uses CMOS silicon technology with TTL-compatible input voltage thresholds and rail-to-rail output swing, enabling direct interfacing with legacy 5V TTL logic without level-shifting. The device exhibits balanced tPLH/tPHL propagation delays and low dynamic power dissipation (CPD = 33pF at 5V), supporting stable operation across full military temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - TTL-compatible input thresholds enable direct connection to 5V TTL outputs without level shifters. |
| Supply Voltage Range | 4.5V to 5.5V - Ensures robust operation under noisy 5V rail conditions common in industrial control boards. |
| Max Clock Frequency | 54MHz at VCC = 5V, CL = 15pF - Supports high-speed state sequencing in programmable logic controllers and data acquisition timing engines. |
| Propagation Delay (CP→Q) | 17ns typical at VCC = 5V, CL = 15pF - Enables sub-20ns setup/hold margin for 40+ MHz synchronous designs. |
| Input Thresholds | VIL ≤ 0.8V (max), VIH ≥ 2.0V (min) - Guarantees reliable recognition of standard TTL logic levels across temperature. |
| Operating Temperature | -55°C to +125°C - Qualified for extended-range applications including avionics, downhole tools, and engine control units. |
| Fanout Capability | 15 LSTTL loads - Drives multiple downstream logic gates without external buffering in dense digital subsystems. |
Pinout & Package
CD74HCT109MT is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package with 1.27mm pitch, JEDEC MS-012 compliant, and moisture sensitivity level (MSL) 1 (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 = H, Q̅ = H; overrides clock and J/K inputs when asserted. |
| 2, 14 | 1J, 2J - Data Input J | J input determines toggle/no-change behavior on next clock edge when K = 0 or 1. |
| 3, 13 | 1K, 2K - Data Input K | K input complements J function; J=K=1 enables toggle mode, J=K=0 holds state. |
| 4, 12 | 1CP, 2CP - Clock Input | Positive-edge-triggered; Schmitt-trigger input rejects noise and accepts slow-rising clocks. |
| 5, 11 | 1S, 2S - Active-low Set | Asynchronous set forces Q = H, Q̅ = L; takes priority over clock and J/K when asserted. |
| 6, 10 | 1Q, 2Q - True Output | Complementary to Q̅; latched state reflects J/K and clock action after positive CP edge. |
| 7, 9 | 1Q̅, 2Q̅ - Complement Output | Inverted version of Q; provides both polarities for feedback or bus driving without external inverters. |
| 8 | GND | Ground reference for all I/O and internal circuitry; must be low-impedance return path. |
| 16 | VCC | Positive supply rail (4.5–5.5V); decoupling capacitor required within 10mm of pin for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous Set and Reset | Independent active-low S/R per flip-flop enable immediate state forcing without waiting for clock edge - critical for system initialization and fault recovery. |
| Schmitt Trigger Clock Inputs | Input hysteresis >0.5V at 5V supply rejects up to 500mV of noise on clock lines, eliminating false triggering in EMI-prone environments. |
| LSTTL-Compatible Input Levels | VIL ≤ 0.8V and VIH ≥ 2.0V ensure interoperability with legacy 74LS, 74ALS, and microcontroller GPIOs without interface components. |
| Balanced Propagation Delays | tPLH and tPHL differ by ≤1ns (typical), minimizing skew between rising/falling output transitions - essential for clean clock distribution and metastability mitigation. |
| Wide Temperature Range | -55°C to +125°C operation validated per MIL-PRF-38535 screening - supports deployment in unheated outdoor enclosures and high-temperature engine bays. |
Applications
| Industrial PLC Timing Modules | Digital Power Supply Sequencing |
|---|---|
Use Scenario: Precise multi-stage power-up and power-down sequencing across FPGAs, ADCs, and RF transceivers in telecom base stations. IC Role / Device Role / Timing Role: Dual J-K flip-flop acts as a synchronous state register controlling enable signals for DC-DC converters via clock-gated outputs. Use Value: Asynchronous reset ensures deterministic startup from brownout; Schmitt-trigger CP inputs tolerate noisy supply-ramp clocks. |
Use Scenario: Implementing watchdog-timed fail-safe shutdown in motor drive inverters where overtemperature or overcurrent must trigger immediate gate disable. IC Role / Device Role / Timing Role: Flip-flop stores fault latch state; set/reset pins driven by comparator outputs to capture first-event faults independently of main controller clock. Use Value: Guaranteed -55°C to +125°C operation ensures reliability in sealed, convection-cooled enclosures near heat sinks. |
| Aerospace Avionics Control Logic | Test Equipment Pattern Generators |
Use Scenario: Generating synchronized pulse trains for sensor excitation and sampling windows in inertial measurement units (IMUs). IC Role / Device Role / Timing Role: Edge-triggered J-K configuration creates divide-by-2 and toggle functions to derive sub-clocks from master oscillator. Use Value: 54MHz fMAX and 17ns CP→Q delay support tight timing budgets in real-time flight control loops. |
Use Scenario: Building finite-state machines in automated test equipment (ATE) that generate stimulus patterns with precise phase alignment. IC Role / Device Role / Timing Role: Dual flip-flops implement overlapping enable/disable cycles for parallel DUT channel control with glitch-free transitions. Use Value: Balanced tPLH/tPHL and low output skew (<1ns) prevent race conditions during pattern switching at >40MHz rates. |
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 |
|---|---|---|---|
| SN74HCT109DR | Same HCT logic family, identical pinout, but rated only for -40°C to +85°C industrial range. | Not suitable for extended-temperature deployments such as downhole or aerospace systems requiring -55°C operation. | Select SN74HCT109DR only for cost-sensitive commercial-grade applications with ambient temperature constraints. |
| CD74HC109MT | Same package and pinout, but HC family: 2V–6V supply, higher VIH/VIL thresholds (VIH ≥ 3.15V @ 4.5V), no TTL compatibility. | Requires level translation when interfacing with legacy 5V TTL drivers; unsuitable for mixed-logic systems without redesign. | Choose CD74HC109MT only when wider supply range or lower static current (ICC < 4µA) outweighs need for TTL input compatibility. |
Compared with CD74HCT109MT, SN74HCT109DR sacrifices extended temperature capability for lower cost and broader distribution, while CD74HC109MT trades TTL compatibility for wider voltage flexibility and lower quiescent power - making CD74HCT109MT the sole choice for ruggedized 5V TTL-interfaced systems demanding full military-grade thermal performance.
Availability
CD74HCT109MT is available at Aetrix Electronics and suitable for industrial automation, aerospace avionics, and digital power supply design requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HCT109MT 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 ICs, with decades of heritage in high-reliability logic families and automotive/military qualification programs.
The CD74HCT109MT belongs to TI's CD74HCT logic series - designed specifically for seamless integration into legacy 5V TTL-based systems while delivering CMOS efficiency, noise immunity, and extended temperature resilience.
FAQ
What is the maximum clock frequency supported by the CD74HCT109MT?
The CD74HCT109MT supports a maximum clock frequency of 54MHz under specified conditions: VCC = 5V, CL = 15pF, TA = 25°C. This value decreases to 18MHz at -55°C to +125°C extremes due to increased propagation delay. The CD74HCT109MT achieves this performance using optimized CMOS gate design with Schmitt-trigger clock inputs to maintain edge integrity at high speeds.
Does the CD74HCT109MT support direct connection to standard TTL outputs?
Yes, the CD74HCT109MT features TTL-compatible input thresholds: VIL ≤ 0.8V (max) and VIH ≥ 2.0V (min) across its full 4.5V–5.5V supply range. This allows direct interfacing with 74LS, 74ALS, and other standard 5V TTL outputs without level-shifting circuitry - a core design objective of the HCT logic family embodied in the CD74HCT109MT.
What happens if both Set and Reset are asserted simultaneously on the CD74HCT109MT?
When both Set (S) and Reset (R) inputs are low simultaneously on the CD74HCT109MT, both Q and Q̅ outputs are forced high - a defined, predictable state. However, if both S and R transition from low to high at the same time, the resulting output state is unpredictable and unstable per the datasheet truth table note; designers must avoid this condition using external arbitration or timing controls in the CD74HCT109MT application.
Is the CD74HCT109MT available in tape-and-reel packaging?
Yes, the CD74HCT109MT is supplied in tape-and-reel format (suffix "T" denotes small-quantity reel of 250 units). This packaging option supports automated SMT assembly and is documented in TI's ordering information table. The CD74HCT109MT reel conforms to EIA-481 standards with 16mm tape width, 8mm pocket pitch, and Q1 pin-one quadrants for consistent machine vision alignment.
What is the thermal resistance (θJA) of the CD74HCT109MT SOIC package?
The CD74HCT109MT in SOIC package (package drawing D) has a typical junction-to-ambient thermal resistance (θJA) of 73°C/W, as specified in the Absolute Maximum Ratings section. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance depends on PCB copper area, airflow, and nearby heat sources - critical for sustained operation at +125°C ambient in the CD74HCT109MT application.
CD74HCT109MT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- 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:
- 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
CD74HCT109MT FAQ
1.How can I place an order for CD74HCT109MT through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT109MT 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 CD74HCT109MT reliable?
The price and inventory of CD74HCT109MT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT109MT is usually 5 days.
3.What payment methods are accepted for CD74HCT109MT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT109MT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT109MT?
CD74HCT109MT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT109MT 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 CD74HCT109MT?
For technical support, including CD74HCT109MT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT109MT requirements.
6.How does Aetrix verify that CD74HCT109MT is sourced from the original manufacturer or authorized distributors?
All CD74HCT109MT 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 CD74HCT109MT meets industry standards.
7.What is the process for return or replacement of CD74HCT109MT?
All CD74HCT109MT units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT109MT, 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 CD74HCT109MT part is unused and in its original packaging.
Return procedure for CD74HCT109MT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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