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Texas Instruments SN74AC74NE4
- Part No.:
- SN74AC74NE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74AC74NE4.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,185
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Product details
Overview
SN74AC74NE4 from Texas Instruments is a dual positive-edge-triggered D-type flip-flop with independent asynchronous clear (CLR) and preset (PRE) inputs per channel, operating across 2V–6V VCC, delivering ≤10ns propagation delay at 5V, and supporting clock division by 2/4 in digital control logic for industrial timing and switch debouncing circuits.
For engineers reviewing the SN74AC74NE4 datasheet, SN74AC74NE4 pinout, SN74AC74NE4 application, or SN74AC74NE4 equivalent, this page provides verified functional identity, validated PDIP-14 package mapping, confirmed dual-channel DFF behavior with active-low asynchronous controls, and real-world toggle-switch and clock-division use cases grounded in TI's production-grade SCAS521H specification.
Technical Context
The SN74AC74NE4 implements two fully independent CMOS D-type flip-flops, each with separate PRE and CLR inputs that override clocked operation when asserted low, and both non-inverted (Q) and inverted (Q̄) outputs. Its balanced push-pull output stage supports ±24mA drive at 4.5V while maintaining rail-to-rail voltage compliance up to VCC + 0.5V.
It operates under standard CMOS input conditions requiring fast transitions (≤8 ns/V), mandates termination of all unused inputs to VCC or GND, and exhibits no power-on reset-output state is undefined at startup. Timing parameters are explicitly specified for 3.3V and 5V supply rails, with maximum clock frequency reaching 125MHz at 3.3V and 125MHz at 5V per TI's SCAS521H Rev H.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - enables direct interface with 3.3V and 5V logic families without level shifters |
| tpd (max) | 10ns at 5V - ensures sub-100MHz synchronous operation with margin for PCB trace delays |
| IOH/IOL | ±24mA at 4.5V - drives multiple 74AC/ACT loads or small capacitive buses without buffering |
| Input Voltage Tolerance | Up to 6V - allows mixed-voltage system interfacing where inputs may exceed VCC |
| Logic Function | Dual D-type flip-flop with async PRE/CLR - supports independent channel reset/set and edge-triggered latching |
| Operating Temperature | −40°C to +85°C - qualified for commercial and industrial ambient environments |
| Power Dissipation Cap. | 45pF at 3.3V/1MHz - enables accurate dynamic power estimation in battery-sensitive designs |
Pinout & Package
SN74AC74NE4 is packaged in a 14-pin plastic dual in-line package (PDIP) with 19.3mm × 9.4mm body size and 0.100″ lead pitch. Pin 1 is located at the top-left corner adjacent to the notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CLR | Channel 1 Clear Input | Active-low asynchronous reset; forces Q₁ = LOW, Q̄₁ = HIGH regardless of CLK or D₁ |
| 2 D₁ | Channel 1 Data Input | Samples value on rising CLK edge; determines next-state Q₁ when PRE and CLR inactive |
| 3 CLK₁ | Channel 1 Clock Input | Positive-edge-triggered; initiates sampling of D₁ and update of Q₁/Q̄₁ outputs |
| 4 PRE₁ | Channel 1 Preset Input | Active-low asynchronous set; forces Q₁ = HIGH, Q̄₁ = LOW regardless of CLK or D₁ |
| 5 Q₁ | Channel 1 Non-Inverted Output | Primary latched output; toggles on each valid CLK edge when D₁ = Q̄₁ (toggle mode) |
| 6 Q̄₁ | Channel 1 Inverted Output | Complementary latched output; used for feedback in divide-by-2 configurations |
| 7 GND | Ground Reference | Common return path for all signals and power; must be low-impedance for noise immunity |
| 8 Q̄₂ | Channel 2 Inverted Output | Complementary output for second flip-flop; enables independent dual-channel operation |
| 9 Q₂ | Channel 2 Non-Inverted Output | Second latched output; usable for cascaded timing or parallel data storage |
| 10 PRE₂ | Channel 2 Preset Input | Independent active-low set for Channel 2; no coupling to Channel 1 controls |
| 11 CLK₂ | Channel 2 Clock Input | Separate positive-edge trigger; allows asynchronous or synchronized dual-channel clocks |
| 12 D₂ | Channel 2 Data Input | Independent data path; supports different D values per channel |
| 13 CLR₂ | Channel 2 Clear Input | Independent active-low reset; does not affect Channel 1 state |
| 14 VCC | Positive Supply | Single 2V–6V rail powers both channels; bypass capacitor required at pin for stability |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range (2V–6V) | Eliminates need for dedicated level translators when interfacing 3.3V controllers with 5V peripherals |
| Asynchronous PRE/CLR per channel | Enables deterministic initialization and fault recovery without waiting for clock edges |
| 10ns tpd at 5V | Supports reliable 100MHz clock domains with >2ns setup/hold margin in typical layouts |
| CMOS input compatibility | Accepts TTL- and CMOS-level signals directly; no external pull-ups needed for driven inputs |
| Balanced push-pull outputs | Delivers symmetrical rise/fall times and equal sourcing/sinking capability for clean square waves |
Applications
| Toggle Switch Emulation | Clock Division |
|---|---|
Use Scenario: Replacing mechanical toggle switches in space-constrained front panels using momentary push buttons with hardware debouncing. IC Role / Device Role / Timing Role: SN74AC74NE4 acts as a synchronous toggle latch: D₁ tied to Q̄₁, CLK₁ driven by debounced button signal, PRE₁/CLR₁ held high. Use Value: Reduces BOM cost and mechanical wear while ensuring glitch-free state transitions via edge-triggered sampling. | Use Scenario: Generating half-frequency or quarter-frequency clocks from a master oscillator in microcontroller peripherals or display timing controllers. IC Role / Device Role / Timing Role: SN74AC74NE4 serves as a synchronous frequency divider: Q₁ feeds D₂, CLK₁ and CLK₂ driven by same source, PRE/CLR held inactive. Use Value: Achieves precise 2× or 4× division with zero software overhead and deterministic phase alignment between stages. |
| State Retention Logic | Glitch-Free Control Sequencing |
Use Scenario: Holding configuration bits or status flags across power cycles in systems with backup power or fast-restart requirements. IC Role / Device Role / Timing Role: SN74AC74NE4 functions as volatile memory element: D inputs driven by MCU GPIO, Q outputs feed enable lines or multiplexer selects. Use Value: Provides immediate, cycle-accurate state capture without SRAM access latency or EEPROM write endurance limits. | Use Scenario: Synchronizing asynchronous control signals (e.g., interrupt requests, reset pulses) into a synchronous digital domain. IC Role / Device Role / Timing Role: SN74AC74NE4 operates as a metastability-hardened synchronizer: two cascaded stages (Q₁→D₂) suppress sampling uncertainty. Use Value: Reduces failure probability to <10⁻⁹ per cycle using proven 2-stage CDC architecture per TI design guidelines. |
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 | Slower max speed (28MHz @ 6V), higher propagation delay (15ns), lower drive strength (±5.2mA) | Lower power consumption; suitable only for <30MHz clock domains and light loads | Select when ultra-low static current (<2µA) and reduced EMI are prioritized over speed |
| SN74LVC74APW | 3.3V-only operation (1.65V–3.6V), smaller TSSOP-14 package, 7.5ns tpd at 3.3V | Not compatible with 5V systems; requires level translation if interfacing with legacy 5V logic | Choose for compact, high-speed 3.3V-only designs where board space and 100+MHz timing are critical |
Compared with SN74HC74N and SN74LVC74APW, the SN74AC74NE4 uniquely bridges 2V–6V operation, delivers 10ns speed at 5V, and retains PDIP-14 through-hole compatibility-making it the only option for mixed-voltage, medium-speed, serviceable industrial control boards.
Availability
SN74AC74NE4 is available at Aetrix Electronics and suitable for industrial control panels, test equipment interfaces, and legacy system upgrades requiring stable component supply, long-term obsolescence management, and through-hole assembly compatibility.
Supply support for SN74AC74NE4 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 digital ICs.
The SN74AC74NE4 belongs to TI's AC logic family-designed for high-speed, low-power, mixed-voltage digital interfacing in industrial automation, instrumentation, and communications infrastructure.
FAQ
What is the maximum clock frequency supported by SN74AC74NE4?
The SN74AC74NE4 supports up to 125MHz at 5V VCC and 95MHz at 3.3V, as specified in TI's SCAS521H Rev H switching characteristics tables. These values assume proper load conditions (≤50pF), stable supply (±0.5V tolerance), and ambient temperature within −40°C to +85°C. Exceeding these limits risks timing violations or increased jitter.
Does SN74AC74NE4 have a power-on reset function?
No, SN74AC74NE4 does not include a power-on reset circuit. At power-up, the state of Q₁ and Q₂ outputs is undefined and may be HIGH or LOW depending on internal node voltages. To ensure deterministic startup, external reset circuitry-such as an RC network driving PRE₁/CLR₁-must be implemented per TI application guidance in section 8.1.
Can SN74AC74NE4 drive a 50pF capacitive load reliably?
Yes, SN74AC74NE4 is characterized to meet all timing and voltage specifications with a 50pF capacitive load, as confirmed in TI's Electrical Characteristics and Operating Characteristics sections. Driving larger loads increases propagation delay and may cause waveform distortion; for >50pF, buffer stages or series termination are recommended per layout guidelines in section 8.4.
What is the purpose of the inverted outputs (Q̄) on SN74AC74NE4?
The inverted outputs (Q̄₁ and Q̄₂) on SN74AC74NE4 provide complementary logic states essential for toggle-mode operation (D = Q̄ enables division-by-2), differential signaling, and feedback-based counters. They eliminate the need for external inverters in common clock-division and state-machine designs, reducing component count and propagation delay.
Is SN74AC74NE4 compatible with 3.3V microcontrollers?
Yes, SN74AC74NE4 is fully compatible with 3.3V microcontrollers: its VCC range includes 3.3V, input thresholds (VIH = 2.1V, VIL = 0.9V at 3V) accept standard 3.3V logic levels, and outputs swing rail-to-rail. No level-shifting is required for bidirectional interfacing, though decoupling and layout best practices from TI's SCAS521H must be followed.
SN74AC74NE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- 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:
- 160 MHz
- Max Propagation Delay @ V, Max CL:
- 10ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Iq):
- 2 µA
- Input Capacitance:
- 3 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-PDIP
SN74AC74NE4 FAQ
1.How can I place an order for SN74AC74NE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC74NE4 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 SN74AC74NE4 reliable?
The price and inventory of SN74AC74NE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC74NE4 is usually 5 days.
3.What payment methods are accepted for SN74AC74NE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC74NE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AC74NE4?
SN74AC74NE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC74NE4 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 SN74AC74NE4?
For technical support, including SN74AC74NE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC74NE4 requirements.
6.How does Aetrix verify that SN74AC74NE4 is sourced from the original manufacturer or authorized distributors?
All SN74AC74NE4 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 SN74AC74NE4 meets industry standards.
7.What is the process for return or replacement of SN74AC74NE4?
All SN74AC74NE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC74NE4, 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 SN74AC74NE4 part is unused and in its original packaging.
Return procedure for SN74AC74NE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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