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Texas Instruments SN74HC574DWRE4
- Part No.:
- SN74HC574DWRE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74HC574DWRE4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,369
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Product details
Overview
SN74HC574DWRE4 from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, designed for bus interface and data latching in digital systems. It operates across 2 V to 6 V, delivers ±6 mA output drive at 5 V, features 22 ns typical propagation delay, and supports clock frequencies up to 24 MHz at 5 V - enabling reliable register buffering in microcontroller I/O expansion and memory-mapped peripheral interfaces.
For engineers reviewing the SN74HC574DWRE4 datasheet, SN74HC574DWRE4 pinout, SN74HC574DWRE4 application, or SN74HC574DWRE4 equivalent, key selection criteria include its 3-state bus-driving capability, low 80 µA max ICC power consumption, wide supply voltage range, and SOIC-20 package compatibility with industrial-grade temperature operation (–40°C to +85°C).
Technical Context
This device implements eight independent D-type latches triggered on the rising edge of CLK, with synchronous data capture and asynchronous 3-state control via OE. Its logic-level compatible inputs and outputs support direct interfacing with TTL and CMOS families across the full 2–6 V supply range.
The 3-state outputs enable bidirectional bus sharing without external pull-ups or direction control logic; OE assertion places all Q outputs in high-impedance mode while preserving internal latch states, allowing concurrent data retention and bus arbitration in multi-master systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - enables interoperability with 3.3 V and 5 V logic domains without level shifters. |
| Propagation Delay (tpd) | 22 ns typical at VCC = 5 V - ensures timing margin for 24 MHz clocked bus transfers in high-speed digital control. |
| Output Drive Strength | ±6 mA at VCC = 5 V - directly drives 15 LSTTL loads or standard PCB traces without buffer amplification. |
| Quiescent Current (ICC) | 80 µA max - supports low-power standby modes in battery-backed or energy-constrained embedded systems. |
| Input Leakage Current | 1 µA max - prevents unintended logic transitions when inputs are tied to VCC/GND in high-impedance configurations. |
| Setup/Hold Times | tsu = 25 ns, th = 5 ns at VCC = 5 V - defines minimum data stability window before/after CLK rising edge for reliable sampling. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including motor control, PLC I/O modules, and factory automation hardware. |
Pinout & Package
SN74HC574DWRE4 uses a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm with standard 0.65 mm lead pitch and gull-wing leads. The pinout follows a bus-structured layout optimized for parallel data routing and minimal trace crosstalk.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CLK) | Clock input | Rising-edge trigger for simultaneous latching of all eight D inputs into respective Q outputs. |
| 2–9 (D1–D8) | Data inputs | Asynchronous parallel data inputs synchronized to CLK edge; accept 2–6 V logic levels. |
| 10 (GND) | Ground reference | Common return path for all signals and power; must be low-impedance for noise immunity. |
| 11–18 (Q1–Q8) | 3-state outputs | Driven high/low or placed in high-Z by OE; each capable of ±6 mA sink/source at 5 V. |
| 19 (OE) | Output enable | Active-low control: OE = low enables outputs; OE = high forces all Q pins to high-impedance state. |
| 20 (VCC) | Power supply | Primary supply rail (2–6 V); requires local 0.1 µF bypass capacitor adjacent to pin for stable switching. |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type latching | Eight independent registers share one clock and output-enable line, simplifying address/data bus buffering in microcontroller peripherals. |
| 3-state bus interface | Enables direct connection to shared data buses without external transceivers or direction logic, reducing BOM count and layout complexity. |
| Wide voltage operation | 2–6 V supply range allows seamless integration into mixed-voltage systems (e.g., 3.3 V MCU with 5 V legacy peripherals). |
| Low power consumption | 80 µA max ICC enables use in always-on monitoring circuits where standby current must remain below 100 µA. |
| High noise immunity | Input thresholds scale with VCC (VIH = 0.7×VCC, VIL = 0.3×VCC), ensuring robust operation under varying supply conditions. |
Applications
| Microcontroller I/O Expansion | Memory-Mapped Peripheral Interface |
|---|---|
|
Use Scenario: Expanding GPIO count of an ARM Cortex-M0+ MCU with limited native pins for driving LED arrays and pushbutton inputs. IC Role / Device Role / Timing Role: Acts as an output latch and input buffer, synchronizing parallel data between MCU and external devices using shared address/data bus. Use Value: Eliminates need for discrete buffers or CPLDs; 22 ns tpd ensures timing compliance with 24 MHz APB bus clocks. |
Use Scenario: Interfacing an FPGA-based video controller to dual-port SRAM used for frame buffering in industrial HMIs. IC Role / Device Role / Timing Role: Provides registered address/data isolation between FPGA and SRAM, preventing bus contention during read-modify-write cycles. Use Value: 3-state outputs allow dynamic bus release during SRAM access arbitration; ±6 mA drive sustains signal integrity over 10 cm PCB traces. |
| Industrial PLC Digital Input Module | Legacy Bus Signal Conditioning |
|
Use Scenario: Capturing 24 V DC sensor signals (via optocoupler front-end) into a 3.3 V logic domain within a DIN-rail mounted PLC module. IC Role / Device Role / Timing Role: Serves as a synchronized input register, latching opto-isolated signals on system clock edges for deterministic scan-cycle behavior. Use Value: Wide 2–6 V supply accommodates 3.3 V logic rails while tolerating transient coupling; 1 µA input leakage avoids false triggers on floating inputs. |
Use Scenario: Adapting a vintage ISA-bus-compatible data acquisition card to modern PCIe-based host controllers using level-shifting bridge logic. IC Role / Device Role / Timing Role: Buffers and isolates ISA data lines during protocol translation, enabling safe hot-swap insertion without bus lockup. Use Value: Bus-structured pinout minimizes trace skew; high-impedance state during reset prevents back-driving legacy bus drivers during initialization. |
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 |
|---|---|---|---|
| SN74HCT574N | TTL-compatible input thresholds (VIH = 2 V min), otherwise identical pinout and function. | Better suited for mixed 5 V TTL/CMOS systems where input noise margins must match legacy TTL logic families. | Select when interfacing with 5 V TTL outputs; SN74HC574DWRE4 remains preferred for pure CMOS or 3.3 V–5 V mixed-supply designs. |
| 74LVC574APW | Lower 1.65–5.5 V supply range, 32 mA output drive, and 3.3 ns tpd at 3.3 V - higher speed but narrower voltage tolerance. | Optimized for high-speed 3.3 V-only systems (e.g., FPGA I/O banks), not suitable for 5 V legacy interfaces. | Choose for new 3.3 V designs requiring faster timing; SN74HC574DWRE4 offers broader voltage flexibility and proven industrial reliability. |
Compared with SN74HCT574N and 74LVC574APW, SN74HC574DWRE4 provides the widest operating voltage range (2–6 V), best balance of speed and power (22 ns / 80 µA), and long-term industrial availability - making it the most versatile choice for legacy-compatible and mixed-voltage embedded bus interfaces.
Availability
SN74HC574DWRE4 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, microcontroller peripheral expansion boards, memory-mapped FPGA interfaces, and legacy bus signal conditioning requiring stable component supply and long-lifecycle support.
Supply support for SN74HC574DWRE4 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 ICs, with decades of experience in industrial-grade logic families.
SN74HC574DWRE4 belongs to the SN74HC high-speed CMOS logic family, engineered for robust bus interface, data latching, and I/O expansion in industrial, automotive, and communications equipment.
FAQ
What is the maximum clock frequency supported by SN74HC574DWRE4?
SN74HC574DWRE4 supports a maximum clock frequency of 24 MHz at VCC = 5 V and TA = 25°C, per its switching characteristics table. At 2 V supply, maximum frequency drops to 5 MHz due to reduced drive strength and increased propagation delay. System-level timing must account for setup/hold requirements (tsu = 25 ns, th = 5 ns at 5 V) and board-level signal integrity.
Does SN74HC574DWRE4 require external pull-up resistors on its 3-state outputs?
No, SN74HC574DWRE4 does not require external pull-up resistors on its Q outputs when used in high-impedance mode. Its 3-state outputs are fully tri-stated with near-infinite impedance (IOZ ≤ ±10 µA), eliminating bus loading. Pull-ups are only needed if open-drain emulation or weak default logic state is required - which is not a function of SN74HC574DWRE4 itself.
Can SN74HC574DWRE4 operate reliably at 3.3 V supply voltage?
Yes, SN74HC574DWRE4 is fully specified for operation at 3.3 V: VIH = 2.31 V min, VIL = 0.99 V max, tpd = 38 ns typical, and output drive ≥ ±4 mA. All electrical characteristics in the datasheet include 3.3 V test conditions, confirming compatibility with standard 3.3 V logic systems without level translation.
What is the thermal resistance (RθJA) of the SN74HC574DWRE4 SOIC package?
The junction-to-ambient thermal resistance RθJA for SN74HC574DWRE4 in the SOIC (DW) package is 109.1°C/W, as specified in the Thermal Information section. This value assumes standard JEDEC 2S2P board conditions; actual thermal performance improves with PCB copper area, vias, and airflow - critical for sustained operation near 85°C ambient.
How does the output-enable (OE) pin affect internal latch states in SN74HC574DWRE4?
The OE pin in SN74HC574DWRE4 has no effect on internal latch states: data stored in the eight D-type flip-flops remains unchanged regardless of OE logic level. When OE = high, outputs go high-impedance but internal Q values persist, allowing new data to be clocked in or retained during bus contention - a key feature for non-blocking register updates in real-time systems.
SN74HC574DWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 40 MHz
- Max Propagation Delay @ V, Max CL:
- 31ns @ 6V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 3 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74HC574DWRE4 FAQ
1.How can I place an order for SN74HC574DWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC574DWRE4 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 SN74HC574DWRE4 reliable?
The price and inventory of SN74HC574DWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC574DWRE4 is usually 5 days.
3.What payment methods are accepted for SN74HC574DWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC574DWRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC574DWRE4?
SN74HC574DWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC574DWRE4 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 SN74HC574DWRE4?
For technical support, including SN74HC574DWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC574DWRE4 requirements.
6.How does Aetrix verify that SN74HC574DWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74HC574DWRE4 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 SN74HC574DWRE4 meets industry standards.
7.What is the process for return or replacement of SN74HC574DWRE4?
All SN74HC574DWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC574DWRE4, 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 SN74HC574DWRE4 part is unused and in its original packaging.
Return procedure for SN74HC574DWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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