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Texas Instruments CD74AC174M
- Part No.:
- CD74AC174M
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74AC174M.pdf
- Description:
- CD74AC174 HEX D-TYPE FLIP-FLOPS
- Quantity:
- Payment:
- Shipping:
Inventory:1,094
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Product details
Overview
CD74AC174M from Texas Instruments is a hex D-type positive-edge-triggered flip-flop with asynchronous clear, designed for 1.5-V to 5.5-V operation. It contains six independent single-rail output stages, features ±24-mA output drive, balanced propagation delays, and SCR-latchup-resistant CMOS construction. It is used in buffer/storage register and shift register applications requiring reliable edge-triggered data capture.
For engineers reviewing the CD74AC174M datasheet, CD74AC174M pinout, CD74AC174M application, or CD74AC174M equivalent, this device serves as a low-power, high-noise-immunity storage element compatible with TTL- and CMOS-level logic across wide voltage rails and industrial temperature ranges (–55°C to 125°C).
Technical Context
The CD74AC174M implements six identical D-type flip-flops sharing a common clock (CLK) and asynchronous clear (CLR) input. Each stage transfers data from D to Q on the rising edge of CLK, while CLR forces Q low independently of CLK. Inputs are buffered, and outputs drive up to 15 F-family loads.
It operates across 1.5 V–5.5 V supply range with guaranteed timing at 1.5 V, 3.3 V, and 5 V. At VCC = 5 V, it achieves fMAX = 108 MHz and tPLH/tPHL ≤ 13.5 ns (–55°C to 125°C), with setup time tsu = 2 ns and hold time th = 2.6 ns - all specified under CL = 50 pF load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced CMOS (AC), TTL-compatible input thresholds and output drive |
| Supply Voltage Range | 1.5 V to 5.5 V - enables direct interfacing with mixed-voltage systems (e.g., 1.8-V, 3.3-V, 5-V domains) |
| Output Drive | ±24 mA at VCC = 4.5–5.5 V - sufficient to drive 15 F-family loads or standard 50-Ω transmission lines |
| Max Clock Frequency | 108 MHz at VCC = 5 V, –55°C to 125°C - supports high-speed synchronous logic in industrial control registers |
| Propagation Delay | tPLH/tPHL ≤ 13.5 ns at VCC = 5 V, CL = 50 pF - ensures tight timing margins in pipeline or latch-based designs |
| ESD Protection | >2 kV per MIL-STD-883, Method 3015 - enhances robustness in handling and board assembly environments |
| Operating Temperature | –55°C to 125°C - qualified for aerospace, automotive under-hood, and industrial motor control applications |
Pinout & Package
CD74AC174M is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package, designated TI package drawing "D", with 1.27-mm pitch, body width 3.9 mm, and JEDEC-standard footprint. Pin 1 is marked by a beveled corner or notch indicator.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLR | Asynchronous active-low clear - resets all six Q outputs to logic low regardless of CLK state |
| 2 | 1Q | Output of first flip-flop - non-inverted, single-rail, capable of ±24-mA drive |
| 3 | 1D | Data input for first flip-flop - sampled on rising CLK edge if setup/hold times met |
| 4 | 2D | Data input for second flip-flop - independent channel, same timing behavior as 1D |
| 5 | 2Q | Output of second flip-flop - electrically isolated from other outputs, no internal bus contention |
| 6 | 3D | Data input for third flip-flop - part of six-channel parallel data path |
| 7 | 3Q | Output of third flip-flop - matches propagation delay and drive strength of 1Q/2Q |
| 8 | GND | Ground reference - must be connected to system ground plane for noise immunity and timing stability |
| 9 | VCC | Positive supply - decoupling capacitor (0.1 µF ceramic) required within 10 mm of this pin |
| 10 | 6Q | Output of sixth flip-flop - final stage in hex configuration, identical electrical specs to 1Q |
| 11 | 6D | Data input for sixth flip-flop - supports full parallel loading of 6-bit data word |
| 12 | 5D | Data input for fifth flip-flop - enables simultaneous latching of multi-bit status or control signals |
| 13 | 5Q | Output of fifth flip-flop - used in cascaded shift register or status feedback loops |
| 14 | 4D | Data input for fourth flip-flop - completes 6-bit parallel input set |
| 15 | 4Q | Output of fourth flip-flop - provides mid-word output access without disturbing adjacent bits |
| 16 | CLK | Common clock input - rising-edge sensitive; all six flip-flops update simultaneously on valid transition |
Key Features
| Feature | Design Value |
|---|---|
| Balanced noise immunity | 30% of VCC - prevents false triggering in noisy industrial environments without external filtering |
| SCR-latchup resistance | Guaranteed per process and circuit design - eliminates risk of destructive latchup during transient overvoltage events |
| Wide VCC range (1.5–5.5 V) | Eliminates level-shifting requirements when interfacing with legacy 5-V and modern low-voltage microcontrollers |
| Buffered inputs | Reduces capacitive loading on upstream drivers and improves signal integrity across PCB traces |
| Low power consumption | ICC = 8 µA typical at VCC = 5.5 V - enables use in battery-backed or energy-constrained register banks |
| Industrial temperature rating | –55°C to 125°C operation - validated for deployment in engine control units, power inverters, and avionics subsystems |
Applications
| Buffer/Storage Register | Shift Register |
|---|---|
|
Use Scenario: Holding 6-bit sensor calibration data between MCU read cycles in an automotive pressure sensor module. IC Role / Device Role / Timing Role: Synchronous storage element capturing parallel data on clock edge; CLR used for cold-start initialization. Use Value: Ensures deterministic, glitch-free retention of critical calibration values across power cycles and EMI exposure. |
Use Scenario: Serial-to-parallel conversion in a programmable logic controller (PLC) I/O expansion card. IC Role / Device Role / Timing Role: First stage of 6-bit shift register chain; CLK synchronized to master controller's SPI frame clock. Use Value: Enables compact, low-component-count implementation of 6-bit parallel output from serial command stream. |
| Industrial Control Latch | Digital Signal Conditioning |
|
Use Scenario: Capturing real-time status flags from motor driver fault monitors in a servo amplifier. IC Role / Device Role / Timing Role: Edge-triggered latch holding six independent fault indicators (overcurrent, overtemp, UVLO, etc.). Use Value: Provides metastability-hardened sampling of asynchronous fault signals with precise timing alignment to system clock domain. |
Use Scenario: Debouncing and synchronizing mechanical switch inputs in a ruggedized HMI panel for factory automation. IC Role / Device Role / Timing Role: Input synchronizer - two stages of CD74AC174M used per switch to eliminate metastability in 125°C ambient. Use Value: Delivers robust, single-clock-cycle synchronization of slow, noisy mechanical inputs into high-speed digital logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AC174N | PDIP-16 package; higher θJA (67°C/W); same AC logic family, identical AC174 core functionality | Preferred for through-hole prototyping or legacy board rework where SOIC footprint unavailable | Select SN74AC174N only when manual soldering or socket-based testing is required; not suitable for automated SMT production. |
| CD74HC174M | HC logic family; lower drive (±5.2 mA); max fCLK = 25 MHz at 5 V; wider VCC range (2–6 V) but reduced speed/noise margin | Suitable for low-power, cost-sensitive consumer applications where 108-MHz timing not needed | Choose CD74HC174M only when system clock < 25 MHz and drive load ≤ 10 LS-TTL units; avoid in noise-critical or high-speed industrial use. |
Compared with SN74AC174N and CD74HC174M, the CD74AC174M uniquely delivers 108-MHz operation with ±24-mA drive in a surface-mount SOIC package, making it optimal for high-reliability, high-speed industrial register applications where thermal performance and noise immunity are prioritized.
Availability
CD74AC174M is available at Aetrix Electronics and suitable for industrial control latches, sensor data buffers, PLC I/O expansion, and motor driver status registers requiring stable component supply across extended temperature and long product lifecycles.
Supply support for CD74AC174M 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and logic ICs for industrial, automotive, and communications markets.
The CD74AC174M belongs to TI's CD74AC high-speed CMOS logic family, engineered for low-power, high-noise-immunity digital interfacing and data storage in harsh-environment applications.
FAQ
What is the maximum clock frequency supported by CD74AC174M at 5 V and full temperature range?
The CD74AC174M supports a maximum clock frequency of 108 MHz at VCC = 5 V and across the full operating temperature range of –55°C to 125°C, as verified in the official TI datasheet SCHS346 under switching characteristics tables. This specification assumes CL = 50 pF and proper power supply decoupling. The CD74AC174M maintains this performance without derating in industrial-grade thermal conditions.
Does CD74AC174M require external pull-up or pull-down resistors on unused inputs?
Yes - all unused inputs of the CD74AC174M must be held at either VCC or GND to prevent floating states that could cause excessive ICC, logic instability, or increased EMI susceptibility. TI's application report SCBA004 explicitly mandates this practice. Leaving inputs unconnected violates recommended operating conditions and may compromise the reliability of the CD74AC174M in production systems.
Is CD74AC174M pin-compatible with CD74HC174M?
No - although both devices share identical pin numbering and function mapping (e.g., CLR on Pin 1, CLK on Pin 16), the CD74AC174M and CD74HC174M are not pin-compatible in terms of electrical behavior. The CD74AC174M drives ±24 mA and operates up to 108 MHz, whereas CD74HC174M drives only ±5.2 mA and maxes out at 25 MHz. Interchanging them without redesign risks timing failure or insufficient drive strength, so the CD74AC174M cannot serve as a drop-in replacement for CD74HC174M.
What is the purpose of the CLR input on CD74AC174M, and how does it behave?
The CLR (clear) input on CD74AC174M is an asynchronous, active-low signal that forces all six Q outputs to logic low immediately - independent of the clock (CLK) state or timing. When CLR returns high, the next rising CLK edge captures new D-input data. This behavior is confirmed in the function table and logic diagram of the CD74AC174M datasheet, enabling deterministic reset for safety-critical or initialization sequences.
Can CD74AC174M operate reliably at 1.8 V supply voltage?
Yes - the CD74AC174M is fully specified for operation from 1.5 V to 5.5 V, including 1.8 V. At VCC = 1.8 V, it delivers guaranteed timing (e.g., fMAX ≥ 8 MHz, tPLH ≤ 169 ns) and noise immunity (30% of 1.8 V = 0.54 V), making it suitable for mixed-signal systems interfacing with 1.8-V microcontrollers. All electrical characteristics in the CD74AC174M datasheet apply across this full voltage range.
CD74AC174M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 6
- Clock Frequency:
- 95 MHz
- Max Propagation Delay @ V, Max CL:
- 13.5ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 1.5V ~ 5.5V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 10 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
CD74AC174M FAQ
1.How can I place an order for CD74AC174M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74AC174M 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 CD74AC174M reliable?
The price and inventory of CD74AC174M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74AC174M is usually 5 days.
3.What payment methods are accepted for CD74AC174M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74AC174M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74AC174M?
CD74AC174M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74AC174M 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 CD74AC174M?
For technical support, including CD74AC174M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74AC174M requirements.
6.How does Aetrix verify that CD74AC174M is sourced from the original manufacturer or authorized distributors?
All CD74AC174M 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 CD74AC174M meets industry standards.
7.What is the process for return or replacement of CD74AC174M?
All CD74AC174M units undergo pre-shipment inspection (PSI). If there is an issue with CD74AC174M, 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 CD74AC174M part is unused and in its original packaging.
Return procedure for CD74AC174M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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