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Texas Instruments CD74AC74M
- Part No.:
- CD74AC74M
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74AC74M.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,135
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Product details
Overview
CD74AC74M from Texas Instruments is a dual positive-edge-triggered D-type flip-flop with independent clear and preset inputs, operating across 1.5 V to 5.5 V supply range, delivering ±24 mA output drive, balanced propagation delays, and SCR-latchup-resistant CMOS process - used in synchronous logic control, clock domain interfacing, and data synchronization circuits.
For engineers reviewing the CD74AC74M datasheet, CD74AC74M pinout, CD74AC74M application, or CD74AC74M equivalent, this page provides verified functional identity, SOIC-14 package mapping, timing parameters at 1.5 V/3.3 V/5 V, dual-channel edge-triggered behavior, and validated alternative options for industrial control and digital system design.
Technical Context
The CD74AC74M implements two independent D-type flip-flops, each with asynchronous active-low clear (CLR) and preset (PRE), synchronous data capture on the rising edge of CLK, and complementary Q/Q̅ outputs. Its AC logic family ensures noise immunity at 30% of VCC and compatibility with TTL-level inputs.
It supports wide temperature operation (−55°C to +125°C), features 55 pF typical power dissipation capacitance, and maintains stable switching characteristics across supply voltages - with fMAX up to 125 MHz at 5 V and tPLH/tPHL as low as 2.5 ns under load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced CMOS (AC), compatible with TTL input thresholds and offering 1.5–5.5 V operation |
| Supply Voltage Range | 1.5 V to 5.5 V - enables direct interface with mixed-voltage systems including 1.8 V, 3.3 V, and 5 V domains |
| Max Clock Frequency | 125 MHz at VCC = 5 V - supports high-speed state sequencing in digital controllers and counters |
| Output Drive | ±24 mA - drives 15 F-series logic loads or directly interfaces with small-signal MOSFET gates |
| Propagation Delay | 2.5 ns (tPLH/tPHL, VCC = 5 V) - ensures tight timing margins in pipelined or cascaded register stages |
| ESD Rating | ±2000 V HBM - meets industrial handling requirements without additional protection circuitry |
| Operating Temperature | −55°C to +125°C - qualified for extended-range automotive, aerospace, and downhole instrumentation |
Pinout & Package
CD74AC74M is packaged in a 14-pin Small Outline Integrated Circuit (SOIC-D) with 8.65 mm × 6.0 mm body size and 1.75 mm maximum height, RoHS-compliant, NIPDAU lead finish, and moisture sensitivity level (MSL) Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CLR | Channel 1 Clear Input | Asynchronous active-low reset - forces 1Q = L / 1Q̅ = H regardless of clock or data state |
| 2 1D | Channel 1 Data Input | Synchronous data input sampled on rising CLK edge when PRE/CLR are inactive (high) |
| 3 1CLK | Channel 1 Clock Input | Positive-edge-triggered clock - transitions >1.5 V qualify as valid edges independent of rise time |
| 4 1PRE | Channel 1 Preset Input | Asynchronous active-low set - forces 1Q = H / 1Q̅ = L regardless of clock or data state |
| 5 1Q | Channel 1 True Output | Non-inverted registered output - reflects 1D state after next qualifying CLK↑ |
| 6 1Q̅ | Channel 1 Complement Output | Inverted registered output - always opposite 1Q; usable for feedback or differential signaling |
| 7 GND | Ground Reference | Primary return path for all internal logic and I/O - must be low-impedance and decoupled locally |
| 8 2Q̅ | Channel 2 Complement Output | Independent inverted output from second flip-flop - no electrical coupling to Channel 1 |
| 9 2Q | Channel 2 True Output | Independent non-inverted output - enables dual-channel storage without external inversion |
| 10 2PRE | Channel 2 Preset Input | Asynchronous set for Channel 2 only - does not affect Channel 1 operation |
| 11 2CLK | Channel 2 Clock Input | Independent clock input - allows separate timing domains or phase-shifted sampling |
| 12 2D | Channel 2 Data Input | Independent data path - supports dual-data-stream latching (e.g., I/Q sampling) |
| 13 2CLR | Channel 2 Clear Input | Asynchronous reset for Channel 2 only - enables selective channel initialization |
| 14 VCC | Positive Supply | Single-supply rail - requires local 0.1 µF ceramic bypass capacitor placed within 3 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent flip-flops | Enables compact implementation of 2-bit registers, toggle dividers, or dual-channel synchronizers without inter-channel delay coupling |
| Asynchronous preset/clear per channel | Allows deterministic initialization or fault recovery without waiting for clock edges - critical for safety-critical state machines |
| Balanced tPLH/tPHL | Minimizes duty-cycle distortion in clock division or pulse generation applications where Q/Q̅ symmetry matters |
| SCR-latchup-resistant process | Prevents destructive latch-up under transient overvoltage or ESD events - eliminates need for external current-limiting resistors |
| 1.5 V to 5.5 V operation | Supports direct integration into battery-powered (1.8 V), industrial (3.3 V), and legacy (5 V) systems without level-shifting |
Applications
| Industrial PLC I/O Expansion | Digital Audio Sample Synchronization |
|---|---|
Use Scenario: Capturing parallel sensor status bits in programmable logic controller backplanes with asynchronous fault-clear signals. IC Role / Device Role / Timing Role: Dual-channel edge-triggered register holding real-time I/O states; PRE/CLR used for emergency stop or module reset. Use Value: Guarantees deterministic state capture at 125 MHz while surviving −55°C to +125°C ambient - eliminating need for external glue logic. |
Use Scenario: Aligning left/right audio sample clocks across ADC/DAC channels in multi-codec systems. IC Role / Device Role / Timing Role: Dual DFF used as synchronized enable latches - one channel aligns LRCLK, the other gates bit-clock edges. Use Value: Achieves sub-nanosecond skew between Q outputs at 5 V, enabling jitter-free I²S/TDM frame alignment without PLL overhead. |
| Automotive CAN Node State Management | Test Equipment Pattern Generation |
Use Scenario: Managing transmit/receive enable states and error flags in ISO 11898-2 CAN transceiver interface circuits. IC Role / Device Role / Timing Role: Flip-flop pair stores bus arbitration outcome and fault latch status, cleared by microcontroller GPIO. Use Value: ±24 mA drive directly controls transceiver EN pins; wide VCC range accommodates 5 V CAN PHY and 3.3 V MCU rails simultaneously. |
Use Scenario: Generating precise multi-phase test vectors for memory or ASIC validation using fixed-pattern sequences. IC Role / Device Role / Timing Role: Cascaded CD74AC74M devices form 2-bit shift registers or Johnson counters driving pattern buffers. Use Value: 2.5 ns propagation delay at 5 V enables <10 ns resolution in pattern timing; SOIC-14 footprint simplifies PCB layout for dense test fixtures. |
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 |
|---|---|---|---|
| SN74AC74DR | Same AC logic family, identical pinout, but rated only for −40°C to +85°C and uses different SOIC package variant (DR vs M) | Limited to commercial/industrial ambient; unsuitable for extended-temperature automotive or aerospace use | Select SN74AC74DR only if operating temperature stays within −40°C to +85°C and RoHS compliance is required without MSL-1 reflow constraints |
| CD74HC74M | HC family - slower max frequency (60 MHz at 6 V), higher propagation delay (~15 ns), lower drive (±5.2 mA), but wider VCC range (2 V–6 V) | Lower speed and drive limit use in high-frequency clocking or bus-driving roles; better for ultra-low-power standby modes | Choose CD74HC74M when power consumption is prioritized over speed, or when 2 V minimum supply is mandatory |
Compared with SN74AC74DR and CD74HC74M, the CD74AC74M uniquely combines extended temperature support (−55°C to +125°C), 125 MHz operation at 5 V, and ±24 mA drive in a single SOIC-14 package - making it the only option for high-reliability, high-speed dual-register functions in harsh environments.
Availability
CD74AC74M is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74AC74M 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 company specializing in analog and embedded processing technologies, with leadership in logic, power management, and signal chain solutions.
The CD74AC74M belongs to TI's CDx4AC74 series of advanced CMOS dual D-type flip-flops, designed for high-speed, low-power, and robust operation in mission-critical digital systems across industrial, aerospace, and defense applications.
FAQ
What is the maximum clock frequency supported by the CD74AC74M at 3.3 V?
The CD74AC74M supports a maximum clock frequency of 90 MHz at VCC = 3.3 V ± 0.3 V over the full operating temperature range (−55°C to +125°C). This value is specified in Section 4.7 of the official TI datasheet SCHS231E and confirmed by switching characteristics testing with CL = 50 pF load. The CD74AC74M maintains reliable edge-triggered operation at this rate due to its balanced AC logic architecture and low propagation delay.
Does the CD74AC74M have built-in ESD protection, and what is its rating?
Yes, the CD74AC74M includes on-chip ESD protection rated at ±2000 V per the Human Body Model (HBM), as documented in Section 4.2 of the TI datasheet SCHS231E. This level meets standard industrial handling requirements and eliminates the need for external ESD diodes in most board-level implementations. The SCR-latchup-resistant CMOS process further enhances robustness against transient overstress events.
Can unused inputs on the CD74AC74M be left floating?
No, unused inputs on the CD74AC74M must not be left floating. Per Section 4.3 and Layout Example in Section 7.1.2 of the TI datasheet, all unused inputs must be tied to either VCC or GND to prevent undefined logic states, increased power consumption, or potential oscillation. For example, an unconnected PRE or CLR input may drift into indeterminate voltage, causing unintended set/reset behavior in the associated flip-flop channel.
What is the recommended bypass capacitor for the CD74AC74M VCC pin?
Texas Instruments recommends a 0.1 µF ceramic capacitor placed as close as possible to the VCC pin (within 3 mm) of the CD74AC74M, as stated in Section 7 Application and Implementation. This capacitor minimizes power supply noise and stabilizes internal node voltages during fast output transitions. For boards with multiple CD74AC74M units or mixed-signal sections, paralleling a 0.01 µF capacitor may improve high-frequency decoupling.
Is the CD74AC74M pin-compatible with the SN74AC74 series?
Yes, the CD74AC74M is functionally and physically pin-compatible with the SN74AC74 series in SOIC-14 packages, sharing identical pin configuration, logic behavior, and DC/AC specifications. However, the CD74AC74M is qualified for −55°C to +125°C operation, whereas SN74AC74 variants are typically rated only to +85°C - making CD74AC74M the appropriate choice for extended-temperature applications despite identical pinout and basic functionality.
CD74AC74M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Set(Preset) and Reset
- Type:
- D-Type
- Output Type:
- Complementary
- Number of Elements:
- 2
- Number of Bits per Element:
- 1
- Clock Frequency:
- 110 MHz
- Max Propagation Delay @ V, Max CL:
- 10ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 1.5V ~ 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:
- 14-SOIC
CD74AC74M FAQ
1.How can I place an order for CD74AC74M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74AC74M 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 CD74AC74M reliable?
The price and inventory of CD74AC74M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74AC74M is usually 5 days.
3.What payment methods are accepted for CD74AC74M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74AC74M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74AC74M?
CD74AC74M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74AC74M 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 CD74AC74M?
For technical support, including CD74AC74M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74AC74M requirements.
6.How does Aetrix verify that CD74AC74M is sourced from the original manufacturer or authorized distributors?
All CD74AC74M 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 CD74AC74M meets industry standards.
7.What is the process for return or replacement of CD74AC74M?
All CD74AC74M units undergo pre-shipment inspection (PSI). If there is an issue with CD74AC74M, 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 CD74AC74M part is unused and in its original packaging.
Return procedure for CD74AC74M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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