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Texas Instruments CD74AC574M
- Part No.:
- CD74AC574M
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74AC574M.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,790
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Product details
Overview
CD74AC574M 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 isolation in industrial control backplanes.
For engineers reviewing the CD74AC574M datasheet, CD74AC574M pinout, CD74AC574M application, or CD74AC574M equivalent, key selection criteria include 3-state output enable timing (13.2 ns enable/disable delay), AC-series voltage flexibility, SCR-latchup resistance, and compatibility with 50 Ω transmission lines in high-speed digital interfaces.
Technical Context
The CD74AC574M implements eight independent D-type latches synchronized to the rising edge of CLK, with asynchronous 3-state control via active-low OE. Its RCA Advanced CMOS process ensures latch-up immunity and rail-to-rail input thresholds (VIH = 3.85 V min at 5.5 V).
Each output supports ±24 mA drive under load, enabling fanout to 15 FAST ICs or direct termination of 50 Ω transmission lines. Propagation delays (tPLH/tPHL) are tightly balanced across all eight channels, critical for skew-sensitive parallel bus applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5 V to 5.5 V - enables single-supply operation across 3.3 V and 5 V logic domains without level shifters |
| Max Clock Frequency | 143 MHz at 5 V - supports high-throughput data capture in real-time control systems |
| Propagation Delay (tPLH/tPHL) | 2.9 ns min / 10.8 ns max at 5 V - ensures sub-11 ns channel-to-channel skew for synchronous bus interfaces |
| Output Drive Strength | ±24 mA per pin - directly drives 50 Ω PCB traces or loads up to 15 FAST-family inputs |
| 3-State Enable/Disable Delay | 3.7 ns min / 14.5 ns max - guarantees clean bus turnaround with minimal contention window |
| Input Leakage Current | ±1 μA max at -55°C to +125°C - maintains signal integrity in low-power standby modes |
| ESD Rating (HBM) | ±2000 V - meets industrial handling requirements without additional protection circuitry |
Pinout & Package
CD74AC574M 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, RoHS-compliant NIPDAU lead finish, and moisture sensitivity level 1 (260°C reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLK (11) | Clock input | Rising-edge trigger synchronizes all eight D inputs to Q outputs; requires monotonic edge with ≤10 ns/V slew rate at 5 V |
| OE (1) | Active-low output enable | Drives all eight outputs to high-impedance when HIGH; enables shared-bus arbitration without external logic |
| VCC (20) / GND (10) | Power supply | Decoupling with 0.1 µF capacitor near each pin required to suppress switching noise during simultaneous output transitions |
| D1–D8 (3,4,7,8,13,14,17,18) | Data inputs | CMOS-compatible inputs with VIH ≥ 3.85 V at 5.5 V; must be tied HIGH or LOW if unused to prevent floating-induced current |
| Q1–Q8 (2,5,6,9,12,15,16,19) | Registered outputs | Non-inverted, 3-state outputs; VOL ≤ 0.5 V at 24 mA sink ensures TTL-compatible low-level signaling |
Key Features
| Feature | Design Value |
|---|---|
| SCR-latchup-resistant CMOS process | Guarantees no destructive latch-up under I/O overvoltage or ground bounce conditions per JEDEC JESD78 |
| Balanced propagation delays | ≤1.0 ns inter-channel skew at 5 V enables reliable 100+ MHz parallel data capture without deskew calibration |
| 1.5 V to 5.5 V wide supply range | Eliminates need for separate voltage rails when interfacing AC574M with mixed-voltage FPGA I/O banks or microcontrollers |
| ±24 mA output drive | Supports direct connection to 50 Ω transmission lines without series termination resistors in point-to-point links |
| 3-state output control | Single OE pin disables all eight outputs simultaneously, simplifying bus arbitration logic in multi-master systems |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Latching sensor data from analog-to-digital converters before multiplexed transmission over CAN or LIN buses. IC Role / Device Role / Timing Role: Octal D-flip-flop captures parallel 8-bit ADC output on clock edge; 3-state outputs isolate data bus during arbitration cycles. Use Value: ±24 mA drive ensures robust signal integrity across noisy vehicle harnesses; -55°C to +125°C rating matches under-hood thermal requirements. |
Use Scenario: Isolating microcontroller GPIOs from high-current door lock actuators and lighting drivers. IC Role / Device Role / Timing Role: Data register buffers MCU commands; OE pin enables/disables driver stage based on safety state machine output. Use Value: SCR-latchup immunity prevents catastrophic failure during load dump transients; 1.5 V minimum supply allows operation during battery brownout events. |
| Test Equipment Digital Pattern Generator | Avionics Data Acquisition Unit |
|
Use Scenario: Generating precise, skew-controlled stimulus waveforms for IC functional testing. IC Role / Device Role / Timing Role: Eight parallel flip-flops synchronize pattern bits to system clock; tight tPLH/tPHL matching ensures <1 ns inter-bit jitter. Use Value: 143 MHz max clock frequency supports >100 Mbps pattern rates; balanced delays eliminate setup/hold violations in high-speed test vectors. |
Use Scenario: Buffering discrete sensor inputs (e.g., pressure, temperature) prior to ARINC 429 encoder processing. IC Role / Device Role / Timing Role: Input latch holds sensor status until polled by flight control processor; OE enables time-multiplexed readout over shared data bus. Use Value: Extended -55°C to +125°C range meets DO-160 environmental test requirements; ±2000 V HBM ESD rating withstands aircraft static discharge events. |
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 AC574 function, but in PDIP-20 package (24.33 mm × 9.4 mm); higher RθJA (50°C/W vs 101.2°C/W) | Preferred for through-hole prototyping or legacy board rework where SOIC footprint unavailable | Select SN74AC574N only when manual soldering or socket-based validation is required; thermal performance limits sustained 143 MHz operation in enclosed enclosures |
| CD74ACT574M | TTL-compatible input thresholds (VIH = 2 V min), 5 V-only supply (4.5–5.5 V), faster tSU/tH (2 ns), but narrower voltage range than CD74AC574M | Suitable for legacy 5 V-only systems with TTL-level microcontrollers or FPGAs lacking 3.3 V I/O support | Choose CD74ACT574M only when interfacing with strict TTL-signaling sources; avoid in mixed-voltage designs requiring 1.5–3.3 V compatibility |
Compared with SN74AC574N and CD74ACT574M, CD74AC574M uniquely combines wide 1.5–5.5 V operation, industrial temperature range, and SOIC-20 packaging - making it optimal for new designs requiring voltage flexibility, space efficiency, and extended thermal reliability.
Availability
CD74AC574M is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, automotive body control modules, and avionics data acquisition units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74AC574M 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.
CD74AC574M belongs to TI's CDx4AC/ACT logic family, designed for industrial, automotive, and aerospace applications demanding latch-up immunity, wide voltage operation, and extended temperature performance.
FAQ
What is the maximum clock frequency supported by CD74AC574M at 3.3 V supply?
The CD74AC574M supports a maximum clock frequency of 101 MHz at 3.3 V supply voltage, as specified in Section 4.7 of the datasheet. This value is validated across the full industrial temperature range (-40°C to +85°C). At 5 V, CD74AC574M achieves 143 MHz, while operation at 1.5 V is limited to 11 MHz. All values assume proper decoupling and signal integrity controls.
Does CD74AC574M require external pull-up or pull-down resistors on unused input pins?
Yes, CD74AC574M requires all unused D-input pins (e.g., D1–D8) and CLK or OE to be tied to either VCC or GND. Floating CMOS inputs can cause increased supply current, logic instability, or localized heating. The datasheet explicitly states that unused inputs must not float - TI recommends using 10 kΩ resistors for robust biasing in industrial environments where leakage paths may exist.
Can CD74AC574M drive a 50 Ω transmission line directly without series termination?
Yes, CD74AC574M can directly drive a 50 Ω transmission line due to its ±24 mA output drive capability, verified per Section 4.5 of the datasheet. At 5 V supply, VOL ≤ 0.5 V at 24 mA sink and VOH ≥ 3.94 V at 24 mA source meet the voltage margin requirements for 50 Ω line driving. No series resistor is needed for point-to-point connections, though stub length and routing must comply with transmission line design rules.
What is the meaning of the 'M' suffix in CD74AC574M?
The 'M' suffix in CD74AC574M denotes the SOIC (Small Outline Integrated Circuit) package type - specifically the DW package variant per TI's packaging nomenclature. This distinguishes it from the 'E' suffix (PDIP-20) and 'F3A' suffix (CDIP-20). The CD74AC574M96G4 ordering part number confirms tape-and-reel delivery of the SOIC-20 version with NIPDAU lead finish and MSL Level-1 rating.
Is CD74AC574M pin-compatible with CD74ACT574M?
Yes, CD74AC574M is pin-compatible with CD74ACT574M - both use identical SOIC-20 (DW) packages and share identical pin functions, including CLK (11), OE (1), VCC (20), GND (10), and all D/Q assignments. However, they differ electrically: CD74AC574M operates from 1.5–5.5 V with CMOS input thresholds, while CD74ACT574M is 5 V-only with TTL-compatible inputs. Interchange requires verifying voltage and logic-level compatibility in the target system.
CD74AC574M 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
CD74AC574M FAQ
1.How can I place an order for CD74AC574M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74AC574M 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 CD74AC574M reliable?
The price and inventory of CD74AC574M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74AC574M is usually 5 days.
3.What payment methods are accepted for CD74AC574M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74AC574M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74AC574M?
CD74AC574M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74AC574M 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 CD74AC574M?
For technical support, including CD74AC574M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74AC574M requirements.
6.How does Aetrix verify that CD74AC574M is sourced from the original manufacturer or authorized distributors?
All CD74AC574M 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 CD74AC574M meets industry standards.
7.What is the process for return or replacement of CD74AC574M?
All CD74AC574M units undergo pre-shipment inspection (PSI). If there is an issue with CD74AC574M, 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 CD74AC574M part is unused and in its original packaging.
Return procedure for CD74AC574M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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