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Texas Instruments SN74HC574DW
- Part No.:
- SN74HC574DW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74HC574DW.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:122
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Product details
Overview
SN74HC574DW from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, designed for bus driving in digital systems. It operates across 2 V to 6 V, delivers ±6 mA output drive at 5 V, exhibits typical propagation delay of 22 ns (CL = 50 pF), and consumes ≤80 µA ICC - enabling direct LSTTL bus interfacing in I/O port and register applications.
For engineers reviewing the SN74HC574DW datasheet, SN74HC574DW pinout, SN74HC574DW application, or SN74HC574DW equivalent, key selection criteria include its SOIC-20 package, clock-edge-triggered data capture, independent 3-state output control via OE, and compatibility with 5-V and mixed-voltage logic buses.
Technical Context
The SN74HC574DW implements eight identical D-type flip-flops, each capturing data on the low-to-high transition of CLK while maintaining independent Q outputs. Its buffered OE input places all eight outputs simultaneously into high-impedance without affecting internal state retention or clock/data operation.
Designed for bus-oriented architectures, it supports bidirectional data flow when paired with complementary devices, features bus-structured pinout for PCB layout efficiency, and meets standard HC logic thresholds (VIH = 3.15 V, VIL = 1.35 V at VCC = 4.5 V) with ±1 µA max input current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - supports mixed-voltage system integration and legacy 5-V bus designs. |
| Propagation Delay (tpd) | 22 ns typical at VCC = 4.5 V, CL = 50 pF - enables reliable operation up to 24 MHz clock frequency. |
| Output Drive | ±6 mA at VCC = 5 V - directly drives up to 15 LSTTL loads without external buffers. |
| Quiescent Current (ICC) | 80 µA max at VCC = 6 V - suitable for low-power digital subsystems and battery-backed registers. |
| Input Leakage Current | ±1 µA max - ensures stable logic levels with high-impedance or weakly driven inputs. |
| 3-State Enable/Disable Time | ten = 38 ns, tdis = 32 ns at VCC = 6 V - enables fast bus arbitration and multiplexing in real-time control paths. |
Pinout & Package
SN74HC574DW is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm, with standard JEDEC MO-153 compliance and 1.27 mm lead pitch. The package supports surface-mount reflow per Level-1-260°C MSL rating and features gull-wing leads for reliable solder joint formation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CLK) | Clock input | Edge-sensitive input triggering all eight flip-flops on rising edge; requires clean, monotonic transitions per timing specs (tw ≥ 14 ns min at 6 V). |
| 2–9 (D1–D8) | Data inputs | Asynchronous parallel data inputs latched on CLK↑; each tied to corresponding Q output with no internal inversion. |
| 10 (GND) | Ground reference | Primary return path for all logic and output currents; must be low-impedance and decoupled near device. |
| 11–18 (Q1–Q8) | 3-state outputs | True-level outputs enabled by OE low; high-impedance when OE high - isolates bus segments during contention. |
| 19 (OE) | Output enable | Active-low control: OE = low enables outputs; OE = high forces all Qx into high-Z - independent of CLK/D state. |
| 20 (VCC) | Power supply | Single-supply rail supporting 2–6 V operation; requires local 0.1 µF ceramic bypass capacitor per TI layout guidance. |
Key Features
| Feature | Design Value |
|---|---|
| Bus-structured pinout | Adjacent D and Q pins (e.g., D1/Q1 on pins 2/11) simplify layer routing and reduce trace crosstalk in dense PCB layouts. |
| High-current 3-state outputs | ±6 mA drive at 5 V allows direct connection to standard TTL/LVTTL buses without pull-up resistors or level shifters. |
| Low power consumption | 80 µA max ICC enables use in always-on register banks and low-duty-cycle control logic without thermal derating. |
| Wide voltage operation | 2–6 V range supports interoperability between 3.3 V microcontrollers and 5 V peripheral buses in hybrid systems. |
| Input transition time tolerance | Supports slow edges up to 1000 ns at 2 V - accommodates RC-filtered or long-trace clock signals without metastability. |
Applications
| Industrial PLC I/O Expansion | Microcontroller Parallel Port Buffering |
|---|---|
|
Use Scenario: Expanding GPIO count on a 32-bit ARM Cortex-M7 controller managing 16-channel analog input modules. IC Role / Device Role / Timing Role: SN74HC574DW acts as an output latch for digital control lines (e.g., channel select, gain setting) synchronized to the MCU's parallel write strobe. Use Value: Enables deterministic timing via single-edge clock capture and eliminates bus contention using OE-controlled 3-state isolation during read-modify-write cycles. |
Use Scenario: Interfacing an 8-bit AVR microcontroller to a 16-bit parallel LCD module requiring separate data and command latching. IC Role / Device Role / Timing Role: SN74HC574DW serves as a dual-purpose register: one instance latches display data, another holds command bytes under independent OE control. Use Value: Eliminates need for discrete transceivers or multiplexers; ±6 mA drive ensures full-swing signal integrity over 10-cm ribbon cable runs. |
| Legacy Bus Interface Adapter | Digital Test Equipment Data Capture |
|
Use Scenario: Bridging a modern FPGA-based test platform to legacy ISA-bus instrumentation cards operating at 5 V. IC Role / Device Role / Timing Role: SN74HC574DW functions as a bidirectional data buffer, with OE toggled by FPGA to control direction and CLK aligned to ISA I/O cycle timing. Use Value: Wide 2–6 V supply range allows direct 5-V operation; 22 ns tpd ensures setup/hold compliance with ISA's 8-MHz maximum I/O rate. |
Use Scenario: Capturing parallel sensor data streams (e.g., 8-channel ADC outputs) in a benchtop logic analyzer with 100-MHz sampling engine. IC Role / Device Role / Timing Role: SN74HC574DW provides synchronous sampling of asynchronous sensor outputs using a centralized clock domain. Use Value: Low 1 µA input leakage prevents loading of high-impedance sensor outputs; bus-structured pinout minimizes skew between D and Q traces. |
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 |
|---|---|---|---|
| SN74HCT574N | TTL-compatible input thresholds (VIH = 2 V min), otherwise identical AC/DC specs and pinout. | Better suited for direct interface with legacy 5-V TTL logic families without level translation. | Select when interfacing exclusively with 5-V TTL sources; not recommended for mixed 3.3/5-V systems due to reduced noise margin at 3.3 V. |
| 74LCX574MTCX | Lower VCC range (2–3.6 V), higher speed (tpd = 6.5 ns @ 3.3 V), and 3.6-V tolerant inputs. | Optimized for 3.3-V-only systems with stringent timing budgets; incompatible with 5-V buses. | Choose for high-speed 3.3-V applications where 5-V tolerance is unnecessary; verify OE timing margins with faster clock edges. |
Compared with SN74HC574DW, SN74HCT574N offers improved 5-V TTL interoperability but sacrifices 3.3-V noise immunity, while 74LCX574MTCX delivers superior speed and 3.3-V efficiency at the cost of 5-V bus compatibility - making SN74HC574DW the optimal general-purpose choice for mixed-voltage industrial interfaces.
Availability
SN74HC574DW is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, microcontroller parallel port buffering, legacy bus interface adapters, and digital test equipment data capture requiring stable component supply and long-term design continuity.
Supply support for SN74HC574DW 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 decades of heritage in industry-standard logic families.
The SN74HC574DW belongs to TI's 74HC high-speed CMOS logic series, engineered for robust bus-driving capability, wide supply flexibility, and seamless integration into industrial control, instrumentation, and legacy-system upgrade designs.
FAQ
What is the maximum clock frequency supported by SN74HC574DW?
The SN74HC574DW supports up to 24 MHz at VCC = 6 V and CL = 50 pF, per its switching characteristics table. At 4.5 V, the maximum clock frequency is 20 MHz. These values assume proper load capacitance, clean power, and compliant input rise/fall times - exceeding them risks setup/hold violations and metastability.
Does SN74HC574DW require external pull-up resistors on its outputs?
No, SN74HC574DW does not require external pull-up resistors on its outputs. Its ±6 mA output drive at 5 V is sufficient to directly drive LSTTL loads and maintain valid logic levels without external components - a key design advantage for bus interface applications.
Can SN74HC574DW operate reliably at 3.3 V?
Yes, SN74HC574DW operates reliably at 3.3 V, meeting all recommended operating conditions: VIH = 2.31 V min and VIL = 0.99 V max at VCC = 3.3 V. Its 2–6 V range ensures full functionality in mixed-voltage systems without level-shifting circuitry.
What is the function of the OE pin on SN74HC574DW?
The OE (output enable) pin on SN74HC574DW is an active-low control that places all eight Q outputs simultaneously into high-impedance (Z) when asserted high. It does not affect internal flip-flop operation - data can be latched or retained regardless of OE state.
Is SN74HC574DW pin-compatible with other packages in the same family?
Yes, SN74HC574DW shares identical pinout and functionality with all 20-pin variants in the SN74HC574 family, including SN74HC574DBR (SSOP), SN74HC574N (PDIP), and SN74HC574PWR (TSSOP) - enabling drop-in replacement across package types without PCB redesign.
SN74HC574DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- 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:
- 36 MHz
- Max Propagation Delay @ V, Max CL:
- 46ns @ 6V, 150pF
- 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
SN74HC574DW FAQ
1.How can I place an order for SN74HC574DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC574DW 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 SN74HC574DW reliable?
The price and inventory of SN74HC574DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC574DW is usually 5 days.
3.What payment methods are accepted for SN74HC574DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC574DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC574DW?
SN74HC574DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC574DW 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 SN74HC574DW?
For technical support, including SN74HC574DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC574DW requirements.
6.How does Aetrix verify that SN74HC574DW is sourced from the original manufacturer or authorized distributors?
All SN74HC574DW 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 SN74HC574DW meets industry standards.
7.What is the process for return or replacement of SN74HC574DW?
All SN74HC574DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC574DW, 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 SN74HC574DW part is unused and in its original packaging.
Return procedure for SN74HC574DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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