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Texas Instruments CD74AC574MG4
- Part No.:
- CD74AC574MG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74AC574MG4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,452
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Product details
Overview
CD74AC574MG4 from Texas Instruments is an octal D-type, 3-state, positive-edge-triggered flip-flop in SOIC-20 package, operating from 1.5 V to 5.5 V with ±24 mA output drive, balanced propagation delays (9.8 ns max at 5 V), and -55°C to +125°C temperature range - used for data latching and bus interface in industrial control and instrumentation systems.
For engineers reviewing the CD74AC574MG4 datasheet, CD74AC574MG4 pinout, CD74AC574MG4 application, or CD74AC574MG4 equivalent, key selection factors include its AC-series voltage flexibility, 3-state output enable control, 50-Ω transmission-line drive capability, and compatibility with legacy TTL logic levels.
Technical Context
This device implements eight independent D-type latches synchronized to the rising edge of CLK, with a separate active-low Output Enable (OE) controlling all eight outputs simultaneously into high-impedance state. Its RCA Advanced CMOS process ensures SCR-latchup resistance and low static power consumption (160 µA max ICC).
Timing behavior is defined by strict setup/hold requirements (2 ns SU/H at 5 V), clock pulse width minimum (3.5 ns), and propagation delay symmetry between Q and Q̅ outputs - enabling reliable operation in synchronous bus-hold and data capture applications across wide supply and temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced CMOS (AC series), compatible with TTL input thresholds and 5-V CMOS output swing |
| Supply Voltage Range | 1.5 V to 5.5 V - supports mixed-voltage system interfacing and low-power operation down to 1.5 V |
| Max Clock Frequency | 143 MHz at 5 V - enables high-speed data sampling in real-time control loops |
| Output Drive | ±24 mA per pin - directly drives 50 Ω transmission lines or fans out to 15 FAST ICs without buffers |
| Propagation Delay | 2.9 ns (tPLH/tPHL, 5 V) - ensures tight timing margins in high-frequency digital interfaces |
| Operating Temperature | -55°C to +125°C - qualified for extended industrial and military-grade embedded applications |
| ESD Rating | ±2000 V HBM - meets standard handling robustness for manufacturing and field deployment |
Pinout & Package
CD74AC574MG4 is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 10.3 mm (including pins), with body size 12.80 mm × 7.50 mm. Pin 1 is located at top-left corner with notch orientation per JEDEC MS-013.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OE (Pin 1) | Active-low output enable | Asserting high disables all eight outputs into high-Z - essential for shared-bus arbitration |
| CLK (Pin 11) | Clock input | Rising-edge sensitive; triggers simultaneous capture of all eight D inputs into respective registers |
| VCC (Pin 20) | Power supply | Accepts 1.5–5.5 V; requires local 0.1 µF bypass capacitor for stable switching performance |
| GND (Pin 10) | Ground reference | Common return path for all signals and internal logic; must be low-inductance connection |
| D1–D8 (Pins 3,4,7,8,13,14,17,18) | Data inputs | Asynchronous inputs sampled on CLK rising edge; must be held stable during setup/hold windows |
| Q1–Q8 (Pins 2,5,6,9,12,15,16,19) | Registered outputs | Non-inverted, 3-state outputs controlled by OE; capable of driving transmission lines or logic loads |
Key Features
| Feature | Design Value |
|---|---|
| SCR-latchup-resistant process | Prevents destructive latch-up under overvoltage or ESD stress - critical for reliability in harsh environments |
| Balanced propagation delays | Ensures matched tPLH/tPHL across all eight channels - eliminates skew-induced timing errors in parallel data paths |
| 1.5 V to 5.5 V operation | Enables direct interface with 1.8 V, 3.3 V, and 5 V logic domains without level shifters |
| ±24 mA output drive | Supports point-to-point or short-bus connections without external drivers - reduces BOM count and layout complexity |
| 3-state output control | Single OE pin manages all eight outputs - simplifies bus contention management in multi-device systems |
Applications
| Industrial PLC I/O Expansion | Test Equipment Data Capture |
|---|---|
Use Scenario: Latching sensor readings from analog-to-digital converters before serial transfer to microcontroller. IC Role / Device Role / Timing Role: Synchronizes parallel 8-bit ADC output to system clock domain using positive-edge-triggered register action. Use Value: Eliminates metastability risk and ensures deterministic sampling timing across all eight channels at up to 143 MHz. | Use Scenario: Capturing high-speed digital waveform samples in automated test equipment front-end. IC Role / Device Role / Timing Role: Acts as a parallel data buffer between high-speed acquisition circuitry and slower controller interface. Use Value: Provides clean, glitch-free latched data with sub-10 ns propagation delay and 50 Ω line drive capability. |
| Avionics Bus Interface | Motor Control Feedback Register |
Use Scenario: Isolating and buffering discrete status signals from flight-critical subsystems onto shared ARINC or MIL-STD-1553 buses. IC Role / Device Role / Timing Role: Provides galvanically isolated (via downstream isolators) 3-state bus interface with precise edge-aligned capture. Use Value: Enables hot-swappable module detection and fault containment via OE-controlled bus disconnection. | Use Scenario: Holding encoder position or current-sense feedback values for real-time motor commutation algorithms. IC Role / Device Role / Timing Role: Stores instantaneous sensor data on each PWM cycle edge for deterministic control loop execution. Use Value: Delivers jitter-free, low-latency feedback registration with guaranteed -55°C to +125°C operation in motor drive enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AC574N | Same AC logic family, identical pinout and timing, but in PDIP-20 package (larger footprint, no RoHS exemption) | Preferred for through-hole prototyping or legacy board rework where SOIC reflow is unavailable | Select when mechanical mounting or hand-soldering constraints override surface-mount preference |
| CD74ACT574M96G4 | ACT variant: TTL-compatible input thresholds (2.0 V VIH min), same SOIC-20 package and pinout, slightly higher ICC | Better suited for mixed 5 V TTL/CMOS systems requiring guaranteed TTL-level recognition | Choose when interfacing with legacy 5 V TTL peripherals where AC-series input noise margin is insufficient |
Compared with SN74AC574N and CD74ACT574M96G4, CD74AC574MG4 offers optimal voltage flexibility (1.5–5.5 V), lowest static power, and industry-standard SOIC packaging - making it the preferred choice for new designs targeting broad supply compatibility and space-constrained layouts.
Availability
CD74AC574MG4 is available at Aetrix Electronics and suitable for industrial automation, avionics subsystems, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74AC574MG4 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 delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
CD74AC574MG4 belongs to TI's legacy CD74AC logic family, designed specifically for high-reliability, wide-temperature-range digital interfacing and data latching in mission-critical embedded systems.
FAQ
What is the maximum clock frequency supported by CD74AC574MG4?
The CD74AC574MG4 supports a maximum clock frequency of 143 MHz at 5 V supply and 25°C ambient, derating to 125 MHz over the full -55°C to +125°C operating range. This specification is validated per TI's switching characteristics table (Section 4.7) and assumes proper signal integrity, load capacitance ≤50 pF, and rise/fall times ≤3 ns.
Does CD74AC574MG4 require external pull-up resistors on unused inputs?
Yes - all unused inputs of CD74AC574MG4 must be tied to either VCC or GND to prevent floating states that cause increased ICC, noise susceptibility, or undefined logic behavior. TI explicitly recommends this in Section 7.2.1 of the datasheet to ensure stable operation and avoid unintended current paths in the CMOS structure.
Can CD74AC574MG4 drive a 50 Ω transmission line directly?
Yes - CD74AC574MG4 delivers ±24 mA output drive per pin, verified to meet minimum 50 Ω transmission-line-drive capability at +85°C (per Section 4.5 footnote). This allows direct connection to controlled-impedance PCB traces without external line drivers in point-to-point or short-bus configurations.
What is the function of Pin 1 (OE) on CD74AC574MG4?
Pin 1 (OE) is the active-low output enable terminal of CD74AC574MG4. When OE is logic high, all eight Q outputs enter high-impedance (3-state) mode regardless of clock or data activity - enabling safe sharing of a common data bus among multiple devices without contention.
Is CD74AC574MG4 RoHS compliant and lead-free?
Yes - CD74AC574MG4 is RoHS compliant with lead-free NIPDAU finish, rated MSL Level-1 (unlimited floor life at <30°C/60% RH), and qualified per TI's Package Option Addendum (May 2024 revision). Its tape-and-reel packaging (2000 units per reel) conforms to JEDEC J-STD-020 standards for lead-free reflow.
CD74AC574MG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 125 MHz
- Max Propagation Delay @ V, Max CL:
- 10.8ns @ 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:
- 20-SOIC
CD74AC574MG4 FAQ
1.How can I place an order for CD74AC574MG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74AC574MG4 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 CD74AC574MG4 reliable?
The price and inventory of CD74AC574MG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74AC574MG4 is usually 5 days.
3.What payment methods are accepted for CD74AC574MG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74AC574MG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74AC574MG4?
CD74AC574MG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74AC574MG4 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 CD74AC574MG4?
For technical support, including CD74AC574MG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74AC574MG4 requirements.
6.How does Aetrix verify that CD74AC574MG4 is sourced from the original manufacturer or authorized distributors?
All CD74AC574MG4 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 CD74AC574MG4 meets industry standards.
7.What is the process for return or replacement of CD74AC574MG4?
All CD74AC574MG4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74AC574MG4, 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 CD74AC574MG4 part is unused and in its original packaging.
Return procedure for CD74AC574MG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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