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Texas Instruments CD54HC74F
- Part No.:
- CD54HC74F
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-CDIP (0.300", 7.62mm)
- Datasheet:
-
CD54HC74F.pdf
- Description:
- HIGH SPEED CMOS LOGIC DUAL POSIT
- Quantity:
- Payment:
- Shipping:
Inventory:1,763
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Product details
Overview
CD54HC74F from Texas Instruments is a dual D-type positive-edge-triggered flip-flop with independent asynchronous clear and preset inputs per channel, operating across 2 V to 6 V supply voltage and –55°C to +125°C temperature range, supporting fanout up to 10 LSTTL loads, and used in clock division and momentary-to-toggle switch conversion circuits.
For engineers reviewing the CD54HC74F datasheet, CD54HC74F pinout, CD54HC74F application, or CD54HC74F equivalent, this page delivers verified functional architecture, timing constraints (e.g., 35 MHz max clock at 6 V), thermal metrics (RθJA = 133.6 °C/W for CDIP), and precise package mapping to CDIP (J) 14-pin hermetic ceramic.
Technical Context
The CD54HC74F implements two fully independent CMOS D-type flip-flops, each with separate asynchronous active-low clear (CLR) and preset (PRE) inputs, and positive-edge-triggered clock (CLK) inputs. Its logic operates on standard CMOS input thresholds and balanced push-pull outputs capable of sourcing/sinking ±25 mA.
It features buffered inputs, supports wide-voltage operation (2–6 V), and guarantees timing performance across military-grade temperature extremes (–55°C to +125°C). Propagation delay is 30 ns typical at 6 V (CL = 50 pF), with setup time of 10 ns and hold time of 3 ns under same conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - enables direct interface with 3.3 V and 5 V logic systems without level translation |
| Operating Temperature | –55°C to +125°C - qualified for aerospace, defense, and high-reliability industrial environments |
| Max Clock Frequency | 35 MHz at 6 V - supports high-speed clock division (÷2, ÷4) in timing-critical control logic |
| Propagation Delay | 30 ns (typ) at 6 V, CL = 50 pF - determines minimum achievable clock period in synchronous designs |
| Output Drive | ±25 mA continuous - sufficient to drive multiple LSTTL loads or small capacitive bus lines |
| Input Capacitance | 10 pF - low loading minimizes signal integrity impact on upstream drivers and clock distribution |
| Power Dissipation Cap. | 25 pF per gate - used to calculate dynamic power consumption in high-frequency toggle applications |
Pinout & Package
CD54HC74F is housed in a hermetic 14-pin Ceramic Dual In-line Package (CDIP, J package), body size 21.30 mm × 7.60 mm, rated for military-temperature operation and long-term reliability in harsh environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 13 | Channel 1 & 2 Clear (CLR) | Asynchronous active-low reset - forces Q = LOW regardless of clock or data state |
| 2, 12 | Channel 1 & 2 Data (D) | Stores logic level on rising CLK edge - defines next-state output value |
| 3, 11 | Channel 1 & 2 Clock (CLK) | Positive-edge-triggered sampling input - synchronizes state changes to system clock edges |
| 4, 10 | Channel 1 & 2 Preset (PRE) | Asynchronous active-low set - forces Q = HIGH independently of clock or data |
| 5, 9 | Channel 1 & 2 True Output (Q) | Non-inverted registered output - provides primary logic state for downstream logic or control |
| 6, 8 | Channel 1 & 2 Complement Output (Q̅) | Inverted registered output - enables toggle configuration when fed back to D input |
| 7 | Ground (GND) | Reference return path for all signals and power - must be low-impedance for noise immunity |
| 14 | Positive Supply (VCC) | Primary power rail - decoupling capacitor (0.1 µF) required adjacent to pin for stable operation |
Key Features
| Feature | Design Value |
|---|---|
| Buffered Inputs | Reduces sensitivity to noise and crosstalk, enabling reliable operation in mixed-signal PCB layouts |
| Wide Voltage Range (2–6 V) | Eliminates need for external voltage translators when interfacing with legacy 5 V and modern 3.3 V subsystems |
| Military-Temperature Rating | Validated operation from –55°C to +125°C ensures functionality in avionics, downhole tools, and space-qualified systems |
| Fanout Support (10 LSTTL) | Drives multiple TTL-compatible inputs directly - reduces need for buffer ICs in distributed control logic |
| Low Dynamic Power | Typical ICC = 4 µA at 6 V - enables ultra-low-power operation in battery-backed or always-on monitoring circuits |
Applications
| Toggle Switch Emulation | Clock Division |
|---|---|
Use Scenario: Replacing mechanical toggle switches with momentary pushbuttons in panel-mounted controls or remote interfaces. IC Role / Device Role / Timing Role: CD54HC74F configured as a T-flip-flop (D tied to Q̅) toggles output state on each debounced clock edge from the button. Use Value: Reduces mechanical wear, improves long-term reliability, and shrinks front-panel footprint while maintaining user-intuitive on/off behavior. |
Use Scenario: Generating sub-harmonics of a master system clock for peripheral timing, LED blinking, or low-speed serial baud rate derivation. IC Role / Device Role / Timing Role: CD54HC74F's first stage divides input clock by 2; cascading both stages achieves ÷4 division with deterministic phase alignment. Use Value: Provides clean, jitter-controlled divided clocks without external PLLs or microcontroller intervention - ideal for deterministic real-time control loops. |
| Power-On State Initialization | Synchronous Reset Sequencing |
Use Scenario: Ensuring known logic states at power-up in safety-critical sequencers, FPGA configuration managers, or watchdog supervisors. IC Role / Device Role / Timing Role: CD54HC74F's asynchronous PRE/CLR pins accept a hardware reset pulse to force Q = LOW or HIGH before clock stabilization. Use Value: Guarantees deterministic startup behavior without software dependency - critical for fail-safe embedded systems. |
Use Scenario: Coordinating reset assertion across multiple digital subsystems using a single synchronized edge-triggered signal. IC Role / Device Role / Timing Role: CD54HC74F latches a global reset request on a system clock edge, distributing a glitch-free, edge-aligned reset pulse to downstream logic blocks. Use Value: Eliminates metastability and race conditions in multi-clock-domain systems - improves design robustness and test repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD74HC74E | Plastic PDIP (N) package, RoHS-compliant NiPdAu finish, rated –55°C to +125°C but not hermetic | Lower cost and lead-free compliance; unsuitable for vacuum, high-humidity, or long-life sealed environments | Select CD74HC74E for commercial/industrial applications where hermeticity and solder-leaded finish are not required. |
| SN54HC74J | Same CDIP (J) package and military temp rating, but TI's legacy 54HC logic family with identical AC/DC specs | No functional difference; SN54HC74J is functionally and pin-compatible but uses older revision control and documentation | Choose SN54HC74J only if legacy qualification traceability or specific procurement history mandates its use. |
Compared with CD54HC74F, CD74HC74E trades hermetic reliability for RoHS compliance and lower cost, while SN54HC74J offers identical performance in a legacy-qualified form - making CD54HC74F the optimal choice when long-term environmental stability and tin-lead solder compatibility are mandatory.
Availability
CD54HC74F is available at Aetrix Electronics and suitable for aerospace control systems, defense electronics, and high-reliability industrial automation requiring stable component supply across extended product lifecycles.
Supply support for CD54HC74F 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 solutions for high-reliability and industrial markets.
The CD54HC74F belongs to TI's 54HC logic family, designed specifically for military and aerospace applications demanding extended temperature operation, hermetic packaging, and long-term supply assurance.
FAQ
What is the maximum clock frequency supported by CD54HC74F?
The CD54HC74F supports a maximum clock frequency of 35 MHz at VCC = 6 V and TA = 25°C, dropping to 23 MHz at full temperature range (–55°C to +125°C). This specification is measured under CL = 50 pF load and defines the upper limit for reliable edge-triggered state transitions in synchronous designs using CD54HC74F.
Does CD54HC74F require external pull-up or pull-down resistors on unused inputs?
Yes - all unused inputs of CD54HC74F must be terminated to either VCC or GND to prevent floating states that cause excessive current draw or undefined logic behavior. A 10-kΩ resistor is commonly used; direct connection is acceptable if the input is permanently inactive. Leaving inputs unconnected violates TI's recommended operating conditions for CD54HC74F.
Is CD54HC74F compatible with 3.3 V logic systems?
Yes - CD54HC74F operates over 2 V to 6 V, making it fully compatible with 3.3 V logic systems. At VCC = 3.3 V, VIH = 2.31 V and VIL = 0.99 V per datasheet specifications, ensuring robust noise margins and interoperability with standard 3.3 V CMOS outputs without level shifters.
What is the thermal resistance (RθJA) of CD54HC74F and why does it matter?
The CD54HC74F has RθJA = 133.6 °C/W (CDIP package), meaning junction temperature rises 133.6°C above ambient per watt of dissipated power. This high value reflects the insulating nature of ceramic packaging and necessitates careful power budgeting - especially in high-density layouts - to keep TJ below 175°C and ensure CD54HC74F reliability.
Can CD54HC74F be used to build a divide-by-3 counter?
No - CD54HC74F implements only D-type flip-flops with asynchronous preset/clear and no built-in feedback logic. A divide-by-3 counter requires custom combinational logic (e.g., NAND gates) to detect count states and reset - CD54HC74F can serve as the storage element but cannot perform modulo-3 division alone. Its native capability is divide-by-2 or divide-by-4 via cascading.
CD54HC74F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54HC
- Package/Case:
- 14-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Set(Preset) and Reset
- Type:
- D-Type
- Output Type:
- Complementary
- Number of Elements:
- 2
- Number of Bits per Element:
- 1
- Clock Frequency:
- 35 MHz
- Max Propagation Delay @ V, Max CL:
- 34ns @ 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:
- 10 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-CDIP
CD54HC74F FAQ
1.How can I place an order for CD54HC74F through Aetrix?
Please submit a Request for Quotation (RFQ) for CD54HC74F 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 CD54HC74F reliable?
The price and inventory of CD54HC74F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD54HC74F is usually 5 days.
3.What payment methods are accepted for CD54HC74F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD54HC74F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD54HC74F?
CD54HC74F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD54HC74F 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 CD54HC74F?
For technical support, including CD54HC74F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD54HC74F requirements.
6.How does Aetrix verify that CD54HC74F is sourced from the original manufacturer or authorized distributors?
All CD54HC74F 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 CD54HC74F meets industry standards.
7.What is the process for return or replacement of CD54HC74F?
All CD54HC74F units undergo pre-shipment inspection (PSI). If there is an issue with CD54HC74F, 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 CD54HC74F part is unused and in its original packaging.
Return procedure for CD54HC74F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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