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Texas Instruments CD74ACT574E

Name: CD74ACT574E
Brand: Texas Instruments
SKU: CD74ACT574E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CD74ACT574E

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: 20-DIP (0.300", 7.62mm)

Datasheet:: CD74ACT574E.pdf

Description:: IC FF D-TYPE SNGL 8BIT 20DIP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

CD74ACT574E from Texas Instruments is an octal D-type, 3-state, positive-edge-triggered flip-flop in a 20-pin PDIP package. It operates at 4.5–5.5 V, delivers ±24 mA output drive, supports 125 MHz max clock frequency at +25°C, and features balanced propagation delays (2.9 ns typical t_PLH/t_PHL). It is used in bus interface and data latching applications within industrial control systems.

For engineers reviewing the CD74ACT574E datasheet, CD74ACT574E pinout, CD74ACT574E application, or CD74ACT574E equivalent, key selection criteria include 3-state output control timing, TTL-compatible input thresholds, 50-Ω transmission-line drive capability, and operation across –55°C to +125°C.

Technical Context

The CD74ACT574E implements eight independent D-type latches synchronized to the rising edge of CLK, with asynchronous 3-state output control via active-high OE. Its RCA Advanced CMOS process ensures SCR latch-up resistance and low static power consumption (≤160 μA ICC over temperature).

Input thresholds are TTL-compatible (VIH = 2 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V), and output switching is characterized at CL = 50 pF with tr/tf = 3 ns. Propagation delay (2.9 ns typ) and enable/disable times (3.7 ns typ) are specified across full military temperature range.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	4.5 V to 5.5 V - Ensures compatibility with standard 5 V TTL/CMOS logic rails and stable operation under supply variation.
Max Clock Frequency	125 MHz at TA = +25°C - Supports high-speed data capture in real-time control and instrumentation interfaces.
t_PLH/t_PHL	2.9 ns typical (VCC = 5 V, CL = 50 pF) - Enables tight timing margins in synchronous bus architectures.
Output Drive	±24 mA per pin - Directly drives 50 Ω transmission lines or fans out to 15 FAST ICs without buffers.
Operating Temperature	–55°C to +125°C - Qualified for extended industrial and military environments including engine control and avionics.
Input Thresholds	VIH = 2.0 V min, VIL = 0.8 V max - Guarantees robust noise immunity and interoperability with legacy TTL outputs.
3-State Leakage	±10 μA max (TA = –55°C to +125°C) - Minimizes bus contention current when outputs are disabled.

Pinout & Package

CD74ACT574E is supplied in a 20-pin plastic dual in-line package (PDIP, N package), body size 24.33 mm × 6.35 mm, with through-hole mounting and industry-standard pin spacing (2.54 mm).

Pin/Terminal	Circuit Role	Design Meaning
1 (OE)	Output Enable input	Active-high control: drives all Q outputs to high-impedance state when HIGH; no effect on register operation.
2–9, 12, 15–16, 19 (1Q–8Q)	Registered data outputs	Non-inverted, 3-state outputs reflecting D-input values captured on prior CLK rising edge.
3–4, 7–8, 13–14, 17–18 (1D–8D)	Data inputs	Independent D inputs for each flip-flop; latched on CLK rising edge regardless of OE state.
11 (CLK)	Clock input	Positive-edge-triggered; all eight registers sample D inputs simultaneously on rising transition.
10 (GND)	Ground reference	Primary return path for logic and output currents; must be low-impedance for signal integrity.
20 (VCC)	Power supply	5 V nominal supply; requires local 0.1 µF bypass capacitor per device to suppress switching noise.

Key Features

Feature	Design Value
SCR-latchup-resistant CMOS	Prevents destructive latch-up under transient overvoltage or ESD stress, enabling reliable operation in noisy industrial environments.
TTL-compatible input thresholds	VIH ≥ 2.0 V and VIL ≤ 0.8 V at 5 V supply - eliminates need for level-shifting when interfacing with legacy TTL devices.
50 Ω transmission-line drive	±24 mA output capability verified at +85°C - supports point-to-point or short-bus routing without external termination resistors.
Balanced propagation delays	Typical t_PLH = t_PHL = 2.9 ns - reduces skew between parallel data bits, critical for setup/hold timing in wide buses.
Wide temperature operation	Specified from –55°C to +125°C - meets requirements for under-hood automotive, aerospace, and military embedded systems.

Applications

Industrial PLC I/O Expansion	Automotive Engine Control Unit (ECU) Data Capture
Use Scenario: Latching sensor data from analog-to-digital converters before transfer to microcontroller over shared address/data bus. IC Role / Device Role / Timing Role: Acts as an octal transparent latch synchronizing 8-bit parallel ADC output to system clock domain. Use Value: Enables deterministic sampling window alignment and prevents metastability during bus arbitration in real-time control loops.	Use Scenario: Isolating and buffering actuator command signals (e.g., fuel injector timing) from main MCU to driver stage. IC Role / Device Role / Timing Role: Provides 3-state isolation between MCU GPIO and high-current drivers, preventing backfeed during reset or fault conditions. Use Value: Eliminates need for discrete MOSFET switches while maintaining fail-safe bus disconnection under all operating modes.
Test Equipment Digital Pattern Generator	Military Radios Baseband Interface
Use Scenario: Holding test vector data for parallel stimulus application to DUT using high-speed digital I/O cards. IC Role / Device Role / Timing Role: Serves as output register staging pattern words from FIFO memory before synchronous launch onto 8-bit parallel bus. Use Value: Delivers sub-3 ns propagation delay consistency across all 8 bits, ensuring precise inter-channel timing alignment.	Use Scenario: Interfacing FPGA-based modem logic with legacy RF transceiver ICs requiring strict 5 V CMOS timing compliance. IC Role / Device Role / Timing Role: Buffers and retimes baseband I/Q data streams between FPGA fabric and analog front-end, enforcing setup/hold margins. Use Value: Maintains signal integrity across wide temperature range (–55°C to +125°C) without derating, supporting field-deployable comms hardware.

Industrial PLC I/O Expansion

Automotive Engine Control Unit (ECU) Data Capture

Use Scenario: Latching sensor data from analog-to-digital converters before transfer to microcontroller over shared address/data bus.

IC Role / Device Role / Timing Role: Acts as an octal transparent latch synchronizing 8-bit parallel ADC output to system clock domain.

Use Value: Enables deterministic sampling window alignment and prevents metastability during bus arbitration in real-time control loops.

Use Scenario: Isolating and buffering actuator command signals (e.g., fuel injector timing) from main MCU to driver stage.

IC Role / Device Role / Timing Role: Provides 3-state isolation between MCU GPIO and high-current drivers, preventing backfeed during reset or fault conditions.

Use Value: Eliminates need for discrete MOSFET switches while maintaining fail-safe bus disconnection under all operating modes.

Test Equipment Digital Pattern Generator

Military Radios Baseband Interface

Use Scenario: Holding test vector data for parallel stimulus application to DUT using high-speed digital I/O cards.

IC Role / Device Role / Timing Role: Serves as output register staging pattern words from FIFO memory before synchronous launch onto 8-bit parallel bus.

Use Value: Delivers sub-3 ns propagation delay consistency across all 8 bits, ensuring precise inter-channel timing alignment.

Use Scenario: Interfacing FPGA-based modem logic with legacy RF transceiver ICs requiring strict 5 V CMOS timing compliance.

IC Role / Device Role / Timing Role: Buffers and retimes baseband I/Q data streams between FPGA fabric and analog front-end, enforcing setup/hold margins.

Use Value: Maintains signal integrity across wide temperature range (–55°C to +125°C) without derating, supporting field-deployable comms hardware.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D-type latch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ACT574N	Identical pinout, same AC/ACT electrical specs, TI-manufactured but different internal die revision and qualification flow.	Same industrial temperature range (–40°C to +85°C); lacks extended military grade (–55°C to +125°C) rating.	Select SN74ACT574N only if extended temperature operation is not required and cost optimization is prioritized.
74ACT574PC	Same function and timing, but manufactured by ON Semiconductor; minor differences in IOZ leakage (±5 μA vs ±10 μA max).	Qualified to –40°C to +85°C only; RoHS-compliant but not MIL-STD-883 tested.	Choose 74ACT574PC for commercial-grade designs where full military qualification is unnecessary.

Compared with CD74ACT574E, SN74ACT574N offers identical functionality at lower cost but sacrifices extended temperature support, while 74ACT574PC provides comparable performance with simplified sourcing yet lacks full military screening - making CD74ACT574E the sole choice for harsh-environment deployments requiring –55°C to +125°C operation and MIL-qualified reliability.

Availability

CD74ACT574E is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive ECU data capture, and military radio baseband interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74ACT574E 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 high-reliability logic, power management, and signal chain solutions.

The CD74ACT574E belongs to TI's Advanced CMOS (ACT) logic family, designed specifically for high-speed, low-power, TTL-compatible digital interfacing in demanding industrial, automotive, and defense applications.

FAQ

What is the maximum clock frequency supported by the CD74ACT574E?

The CD74ACT574E supports a maximum clock frequency of 125 MHz at +25°C ambient temperature and 5 V supply, derating to 110 MHz across the full –55°C to +125°C operating range. This specification is measured under defined switching conditions (tr/tf = 3 ns, CL = 50 pF) and reflects guaranteed timing performance for synchronous data capture in high-speed digital systems. The CD74ACT574E maintains this performance without external acceleration circuitry.

Does the CD74ACT574E require external pull-up or pull-down resistors on unused inputs?

Yes, all unused inputs of the CD74ACT574E must be tied to either VCC or GND to prevent floating states that could cause increased power consumption, logic instability, or undefined output behavior. TI explicitly recommends this in Section 7.2.1 of the datasheet. Leaving inputs unconnected violates proper CMOS design practice and may compromise the reliability of the CD74ACT574E in production systems.

Can the CD74ACT574E drive 50 Ω transmission lines directly?

Yes, the CD74ACT574E is explicitly characterized to drive 50 Ω transmission lines, verified at +85°C with ±24 mA output drive capability. This capability is confirmed in both the Features section and Section 4.5 of the datasheet, eliminating the need for external line drivers in point-to-point or short-bus configurations - a key design advantage of the CD74ACT574E in high-speed digital interconnects.

What is the operating voltage range for the CD74ACT574E?

The CD74ACT574E operates over a supply voltage range of 4.5 V to 5.5 V, as specified in Section 4.3 (Recommended Operating Conditions). Unlike its AC-series counterparts, the ACT variant is not rated for 1.5–5.5 V operation. Operation outside this 4.5–5.5 V window may result in non-compliant timing, reduced noise margin, or functional failure - a critical constraint for the CD74ACT574E in 5 V system designs.

Is the CD74ACT574E pin-compatible with the CD74AC574E?

Yes, the CD74ACT574E shares identical pin configuration and package footprint with the CD74AC574E, as confirmed in Section 3 (Pin Configuration and Functions) and Section 6.1 (Overview) of the datasheet. However, they differ electrically: CD74AC574E supports 1.5–5.5 V operation and has different input thresholds, while CD74ACT574E is optimized for 4.5–5.5 V with TTL-compatible VIH/VIL - making them functionally interchangeable only within 5 V systems.

CD74ACT574E Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74ACT

Package/Case:: 20-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Active

Function:: Standard

Type:: D-Type

Output Type:: Tri-State, Non-Inverted

Number of Elements:: 1

Number of Bits per Element:: 8

Clock Frequency:: 110 MHz

Max Propagation Delay @ V, Max CL:: 11.2ns @ 5V, 50pF

Trigger Type:: Positive Edge

Current - Output High, Low:: 24mA, 24mA

Voltage - Supply:: 4.5V ~ 5.5V

Current - Quiescent (Iq):: 8 µA

Input Capacitance:: 10 pF

Operating Temperature:: -55°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 20-PDIP

CD74ACT574E FAQ

1.How can I place an order for CD74ACT574E through Aetrix?

Please submit a Request for Quotation (RFQ) for CD74ACT574E 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 CD74ACT574E reliable?

The price and inventory of CD74ACT574E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74ACT574E is usually 5 days.

3.What payment methods are accepted for CD74ACT574E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74ACT574E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CD74ACT574E?

CD74ACT574E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CD74ACT574E 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 CD74ACT574E?

For technical support, including CD74ACT574E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74ACT574E requirements.

6.How does Aetrix verify that CD74ACT574E is sourced from the original manufacturer or authorized distributors?

All CD74ACT574E 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 CD74ACT574E meets industry standards.

7.What is the process for return or replacement of CD74ACT574E?

All CD74ACT574E units undergo pre-shipment inspection (PSI). If there is an issue with CD74ACT574E, 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 CD74ACT574E part is unused and in its original packaging.

Return procedure for CD74ACT574E:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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