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Texas Instruments CD74HC74EE4
- Part No.:
- CD74HC74EE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74HC74EE4.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,951
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Product details
Overview
CD74HC74EE4 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, supporting –55°C to +125°C industrial/military temperature range, delivering ≤45 ns propagation delay at 6 V, and used in clock division and momentary-to-toggle switch conversion circuits.
For engineers reviewing the CD74HC74EE4 datasheet, CD74HC74EE4 pinout, CD74HC74EE4 application, or CD74HC74EE4 equivalent, key selection criteria include dual-channel edge-triggered storage behavior, rail-to-rail CMOS output drive capability, guaranteed timing at extended temperature, asynchronous control pin functionality, and PDIP-14 package compatibility with through-hole prototyping and legacy industrial PCBs.
Technical Context
The CD74HC74EE4 implements two fully independent D-type flip-flops sharing only VCC and GND rails. Each channel features separate positive-edge-triggered clock (CLK), data (D), active-low preset (PRE), active-low clear (CLR), true (Q), and complement (Q̅) outputs - enabling simultaneous but isolated state storage and toggling operations.
Its buffered CMOS inputs accept standard logic thresholds (VIH ≥ 3.15 V @ 4.5 V VCC), while push-pull outputs deliver symmetrical sourcing/sinking (±4 mA @ 4.5 V), with timing parameters including 10 ns minimum clock pulse width and 13 ns setup time at 6 V, ensuring reliable operation in synchronous digital systems up to 29 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | High-speed CMOS (74HC), compatible with TTL input thresholds and offering lower power than LSTTL |
| Supply Voltage Range | 2 V to 6 V - supports single-supply operation across battery, 3.3 V, and 5 V systems without level shifting |
| Operating Temperature | –55°C to +125°C - qualified for aerospace, automotive under-hood, and industrial control environments |
| Max Clock Frequency | 29 MHz at 6 V - enables reliable clock division by 2 or 4 in timing-critical signal conditioning paths |
| Propagation Delay | 30 ns (typ) / 45 ns (max) at 6 V - ensures predictable setup/hold timing margins in cascaded logic chains |
| Output Drive | ±4 mA @ 4.5 V - sufficient to directly drive 10 LSTTL loads or interface with downstream CMOS inputs |
| Input Capacitance | 10 pF - minimizes loading on preceding drivers and preserves signal integrity in high-speed routing |
Pinout & Package
CD74HC74EE4 uses a 14-pin plastic dual in-line package (PDIP-N), 19.30 mm × 6.40 mm body size, with through-hole mounting and industry-standard pin spacing (0.1 inch). Pin 1 is marked by a notch or dot; pin numbering follows standard counter-clockwise layout when viewed from top.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 13 | Channel 1 & 2 Clear (active-low) | Asynchronous reset: forces Q = LOW regardless of clock or data state; requires pull-up for stable HIGH default |
| 2, 12 | Channel 1 & 2 Data Input | Stores logic level at next positive clock edge; must be stable ≥13 ns before CLK rising edge (6 V) |
| 3, 11 | Channel 1 & 2 Clock Input | Positive-edge-triggered sampling node; accepts fast transitions (≤400 ns input rise/fall at 6 V) |
| 4, 10 | Channel 1 & 2 Preset (active-low) | Asynchronous set: forces Q = HIGH independently of clock; tied HIGH when unused to prevent unintended assertion |
| 5, 9 | Channel 1 & 2 True Output | Non-inverted registered output; capable of sourcing/sinking ±4 mA while maintaining VOH ≥ 3.98 V / VOL ≤ 0.33 V |
| 6, 8 | Channel 1 & 2 Complement Output | Inverted registered output; electrically identical to Q but phase-opposed - useful for differential signaling or feedback |
| 7 | Ground (GND) | Reference return path for all inputs/outputs; must be low-impedance and decoupled near VCC pin |
| 14 | Positive Supply (VCC) | Power rail for internal logic and output drivers; requires 0.1 µF ceramic bypass capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Buffered CMOS Inputs | Reduces sensitivity to noise and crosstalk; enables reliable operation with slow-rising signals when combined with external Schmitt triggers |
| Asynchronous Control Pins | Independent PRE/CLR per channel allow immediate state override without waiting for clock edge - critical for system initialization and fault recovery |
| Rail-to-Rail Output Swing | VOH ≥ 3.98 V and VOL ≤ 0.33 V at 4.5 V supply ensure full logic-level compatibility with downstream 5 V CMOS and TTL interfaces |
| Low Dynamic Power | ICC ≤ 40 µA (max) at 6 V eliminates need for thermal derating in dense logic arrays and extends battery life in portable instrumentation |
| Extended Temperature Range | –55°C to +125°C operation validated per MIL-PRF-38535 requirements - suitable for avionics, downhole tools, and engine control units |
Applications
| Toggle Switch Emulation | Clock Division |
|---|---|
|
Use Scenario: Replacing mechanical toggle switches in space-constrained industrial HMI panels using low-cost momentary pushbuttons. IC Role / Device Role / Timing Role: CD74HC74EE4 acts as a synchronous edge-triggered state latch: D input tied to Q̅, CLK driven by debounced button press, generating clean toggle output. Use Value: Eliminates mechanical wear, reduces BOM cost by >60%, and enables remote actuation via microcontroller GPIO without additional logic gates. |
Use Scenario: Generating precise ½ or ¼ frequency sub-clocks from a master oscillator in FPGA configuration sequencers and ADC sampling controllers. IC Role / Device Role / Timing Role: CD74HC74EE4 functions as a divide-by-2 counter stage: Q output fed back to D input, CLK driven by master clock, producing deterministic 50% duty-cycle output. Use Value: Provides jitter-free clock scaling without PLL complexity; maintains phase coherence between master and derived clocks for timing-critical analog front-ends. |
| Power-On Reset Synchronization | Dual-Channel State Storage |
|
Use Scenario: Ensuring deterministic initial states in safety-critical PLC I/O modules during cold start or brownout recovery. IC Role / Device Role / Timing Role: CD74HC74EE4 serves as a synchronized reset latch: CLR pins tied to RC-based POR circuit, CLK driven by stabilized system clock after power ramp. Use Value: Guarantees both flip-flop channels enter known LOW state simultaneously - preventing metastability in control logic sequencers and watchdog enable paths. |
Use Scenario: Capturing parallel status bits from sensor arrays (e.g., temperature, pressure, flow) in real-time monitoring systems with isolated channel requirements. IC Role / Device Role / Timing Role: CD74HC74EE4 operates as two independent data registers: each channel samples distinct sensor outputs on shared clock edge with separate clear/preset control. Use Value: Enables concurrent acquisition of unrelated analog/digital events without cross-channel interference - essential for fault-detection redundancy architectures. |
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 |
|---|---|---|---|
| SN74HC74N | Same logic function and pinout; rated for –40°C to +85°C only; lower max fCLK (25 MHz @ 4.5 V) | Suitable for commercial-grade consumer electronics but not qualified for extended temperature industrial use | Select SN74HC74N only if operating ambient stays within 0–70°C and cost is primary constraint |
| MC74HC74ANG | Identical electrical specs; manufactured by ON Semiconductor; RoHS-compliant PDIP-14 with same 19.3 × 6.4 mm footprint | Drop-in replacement with identical thermal and timing behavior; validated for same military temp range (–55°C to +125°C) | Choose MC74HC74ANG when dual-sourcing or second-source qualification is required for long-lifecycle programs |
Compared with CD74HC74EE4, SN74HC74N lacks extended temperature support and has reduced speed margin, while MC74HC74ANG provides identical performance and qualification - making it the preferred alternative for mission-critical deployments requiring supply chain resilience.
Availability
CD74HC74EE4 is available at Aetrix Electronics and suitable for industrial control systems, aerospace avionics interfaces, and automotive engine management units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HC74EE4 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 90 years of innovation in high-reliability components for industrial, automotive, and defense markets.
The CD74HC74EE4 belongs to TI's 74HC logic family, designed specifically for robust, low-power, wide-voltage-range digital interfacing in harsh-environment applications where timing predictability and thermal stability are non-negotiable.
FAQ
What is the maximum clock frequency supported by CD74HC74EE4?
The CD74HC74EE4 supports a maximum clock frequency of 29 MHz at 6 V supply voltage and –55°C to +125°C operating temperature. At 4.5 V, the guaranteed maximum is 25 MHz, and at 2 V it drops to 4 MHz. These values are specified in the switching characteristics table and reflect worst-case conditions across full temperature and voltage ranges - the CD74HC74EE4 must be operated within these limits to ensure functional reliability.
Does CD74HC74EE4 require external pull-up resistors on PRE and CLR pins?
Yes, CD74HC74EE4 requires external pull-up resistors on both PRE and CLR pins when not actively driven low, because they are active-low asynchronous controls with no internal pull-ups. A 10-kΩ resistor to VCC is recommended per TI application guidance to ensure stable HIGH default states and prevent unintended toggling or resetting due to floating inputs.
Can CD74HC74EE4 operate reliably at 3.3 V supply voltage?
Yes, CD74HC74EE4 is fully specified to operate at 3.3 V supply voltage, with validated parameters including VIH = 2.31 V (min), VOL = 0.33 V (max), and tpd = 44 ns (max) across –55°C to +125°C. Its 2 V to 6 V operating range makes CD74HC74EE4 ideal for mixed-voltage systems interfacing with 3.3 V microcontrollers while retaining compatibility with legacy 5 V peripherals.
What is the thermal resistance (RθJA) of the CD74HC74EE4 package?
The CD74HC74EE4 uses a PDIP-14 (N) package with a junction-to-ambient thermal resistance (RθJA) of 62.2°C/W, as specified in TI's SCHS124E datasheet. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance depends on PCB copper area, airflow, and nearby heat sources - adequate heatsinking is unnecessary for typical logic-level power dissipation (<1 mW per gate).
Is CD74HC74EE4 pin-compatible with CD74HC74M (SOIC-14)?
No, CD74HC74EE4 (PDIP-14) is not mechanically or soldering-process pin-compatible with CD74HC74M (SOIC-14), though their electrical pin functions are identical. The PDIP version has 0.1-inch lead pitch and through-hole mounting, while SOIC requires surface-mount reflow. Board redesign is required for substitution - however, logic behavior, timing, and DC specs remain consistent across both packages.
CD74HC74EE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 14-DIP (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-PDIP
CD74HC74EE4 FAQ
1.How can I place an order for CD74HC74EE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HC74EE4 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 CD74HC74EE4 reliable?
The price and inventory of CD74HC74EE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HC74EE4 is usually 5 days.
3.What payment methods are accepted for CD74HC74EE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HC74EE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HC74EE4?
CD74HC74EE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HC74EE4 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 CD74HC74EE4?
For technical support, including CD74HC74EE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HC74EE4 requirements.
6.How does Aetrix verify that CD74HC74EE4 is sourced from the original manufacturer or authorized distributors?
All CD74HC74EE4 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 CD74HC74EE4 meets industry standards.
7.What is the process for return or replacement of CD74HC74EE4?
All CD74HC74EE4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HC74EE4, 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 CD74HC74EE4 part is unused and in its original packaging.
Return procedure for CD74HC74EE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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