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Texas Instruments SN74HC574PWT
- Part No.:
- SN74HC574PWT
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HC574PWT.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:160
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Product details
Overview
SN74HC574PWT 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 from 2 V to 6 V, delivers ±6 mA output drive at 5 V, exhibits typical propagation delay of 22 ns, and consumes ≤80 µA ICC - enabling reliable data latching and bidirectional bus control in industrial I/O interfaces.
For engineers reviewing the SN74HC574PWT datasheet, SN74HC574PWT pinout, SN74HC574PWT application, or SN74HC574PWT equivalent, key selection criteria include its 20-pin TSSOP package, clock-edge-triggered storage behavior, high-current 3-state output capability, and compatibility with LSTTL bus loading requirements.
Technical Context
This device implements eight independent D-type flip-flops synchronized on the low-to-high transition of CLK. Each output is controlled by a common buffered OE input, allowing simultaneous high-impedance state entry without affecting internal latch states or data retention.
It supports wide supply voltage (2–6 V), features bus-structured pinout for PCB layout efficiency, and meets standard HC logic thresholds (VIH = 3.15 V @ 4.5 V, VIL = 1.35 V @ 4.5 V), ensuring interoperability with mixed-voltage 3.3 V/5 V digital systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2 V to 6 V - enables operation across 3.3 V and 5 V logic domains without level shifters |
| Output Drive | ±6 mA @ 5 V - directly drives up to 15 LSTTL loads without external buffers |
| Propagation Delay | 22 ns typical @ 4.5 V - supports >20 MHz clock rates in synchronous bus applications |
| Quiescent Current | 80 µA max - suitable for low-power embedded control and battery-backed registers |
| Input Leakage | 1 µA max - ensures stable logic levels with high-impedance or floating inputs properly terminated |
| 3-State Enable Time | 32 ns max @ 4.5 V - enables fast bus arbitration and multiplexing in real-time systems |
Pinout & Package
TSSOP-20 package (PW), 6.50 mm × 4.40 mm body size, 1.2 mm max height, 0.65 mm lead pitch, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–8, 13–20 | Data Input / Q Output | Paired Dn/Qn terminals (D1–D8 inputs, Q1–Q8 outputs) - bus-aligned for compact routing |
| 9 | GND | Ground reference for all logic and output stages - requires local 0.1 µF bypass |
| 10 | CLK | Clock input - triggers all eight flip-flops on rising edge; edge-sensitive, not level-sensitive |
| 11 | OE | Active-low 3-state enable - asserts high-impedance when high; no effect on internal latch state |
| 12 | VCC | Positive supply - must be decoupled locally; supports 2–6 V operation |
Key Features
| Feature | Design Value |
|---|---|
| Bus-structured pinout | Minimizes trace crossovers and simplifies PCB layout for 8-bit data paths |
| High-current 3-state outputs | Eliminates need for external bus transceivers in medium-speed parallel interfaces |
| Low input current (≤1 µA) | Reduces loading on upstream drivers and enables direct connection to microcontroller GPIO |
| Wide VCC range (2–6 V) | Permits single-part deployment across 3.3 V FPGA I/O banks and legacy 5 V backplanes |
| Edge-triggered storage | Ensures deterministic sampling of asynchronous data with precise setup/hold timing |
Applications
| Industrial I/O Expansion | Microcontroller Parallel Interface |
|---|---|
Use Scenario: Adding 8-bit parallel input/output capability to PLC modules using limited MCU GPIO resources. IC Role / Device Role / Timing Role: Acts as an output latch and input buffer, isolating field-side signals from the controller bus via 3-state control. Use Value: Enables clean bus sharing between multiple peripherals without contention, leveraging OE for dynamic bus ownership. | Use Scenario: Interfacing an 8-bit microcontroller data bus to external memory-mapped peripherals or displays. IC Role / Device Role / Timing Role: Serves as address/data latch during multiplexed bus cycles, capturing and holding valid data on CLK edge. Use Value: Provides deterministic timing alignment and eliminates bus glitches during read/write strobes. |
| Legacy Bus Buffering | Digital Test Equipment Data Capture |
Use Scenario: Driving TTL-compatible control lines from modern low-voltage logic in test instrumentation. IC Role / Device Role / Timing Role: Functions as a level-translating bus driver with 3-state isolation between subsystems. Use Value: Delivers ±6 mA drive at 5 V while accepting 3.3 V logic inputs, avoiding discrete level-shifter components. | Use Scenario: Capturing parallel sensor or ADC output streams synchronized to a system clock. IC Role / Device Role / Timing Role: Operates as a synchronous data sampler, storing sampled values on each CLK rising edge. Use Value: Ensures metastability-free capture with verified 25 ns setup time margin at 4.5 V supply. |
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 |
|---|---|---|---|
| SN74HCT574PWR | TTL-compatible input thresholds (VIH = 2 V min); identical pinout and function | Better suited for mixed 5 V TTL/CMOS systems where input noise immunity is critical | Select when interfacing with legacy 5 V TTL outputs without pull-ups |
| 74LCX574MTCX | Lower VCC range (2–3.6 V), higher speed (tpd = 6.5 ns @ 3.3 V), different pinout | Optimized for 3.3 V-only portable/embedded designs requiring sub-10 ns timing | Choose only if operating strictly at 3.3 V and needing faster propagation than SN74HC574PWT |
Compared with SN74HC574PWT, SN74HCT574PWR offers improved noise margin with TTL input compatibility but same 20-pin TSSOP footprint, while 74LCX574MTCX provides higher speed at lower voltage but requires PCB redesign due to non-identical pin assignment.
Availability
SN74HC574PWT is available at Aetrix Electronics and suitable for industrial I/O expansion, microcontroller parallel interface, and legacy bus buffering requiring stable component supply and long-term obsolescence management.
Supply support for SN74HC574PWT 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, with over 90 years of innovation in logic, power, and signal chain technologies.
The SN74HC574PWT belongs to TI's industry-standard 74HC logic family, engineered for robust bus-driving performance, wide supply tolerance, and seamless integration into industrial control, test equipment, and legacy-compatible digital systems.
FAQ
What is the maximum clock frequency supported by SN74HC574PWT?
The SN74HC574PWT supports up to 24 MHz maximum clock frequency at 4.5 V supply and 25 °C, with guaranteed timing margins per datasheet Table 5.5. At 6 V, fmax reaches 28 MHz under same conditions. These values assume CL = 50 pF load and proper PCB layout with decoupling.
Does SN74HC574PWT require external pull-up resistors on its outputs?
No, SN74HC574PWT does not require external pull-up resistors on its outputs. Its 3-state outputs provide active high/low drive in normal mode and true high-impedance (not weak pull-up) when OE is asserted, eliminating need for passive termination in bus-shared configurations.
Can SN74HC574PWT operate reliably at 3.3 V supply?
Yes, SN74HC574PWT operates reliably at 3.3 V supply. Its recommended operating range (2–6 V) fully covers 3.3 V systems, and electrical characteristics - including VIH = 2.31 V min and VOL = 0.1 V max at 3.3 V - ensure compatibility with standard 3.3 V CMOS logic families.
What is the thermal resistance (RθJA) of SN74HC574PWT in its TSSOP package?
The junction-to-ambient thermal resistance (RθJA) of SN74HC574PWT in the TSSOP-20 (PW) package is 131.8 °C/W, as specified in TI's SCLS148H datasheet Revision H. This value assumes JEDEC-standard PCB mounting with two-layer copper and no thermal vias.
Is SN74HC574PWT pin-compatible with SN74HC374?
No, SN74HC574PWT is not pin-compatible with SN74HC374. While both are octal D-type flip-flops with 3-state outputs, SN74HC374 uses a different pinout: its OE is active-high and located on Pin 1, whereas SN74HC574PWT has active-low OE on Pin 11. PCB layout and firmware control logic must be redesigned for substitution.
SN74HC574PWT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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-TSSOP
SN74HC574PWT FAQ
1.How can I place an order for SN74HC574PWT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC574PWT 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 SN74HC574PWT reliable?
The price and inventory of SN74HC574PWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC574PWT is usually 5 days.
3.What payment methods are accepted for SN74HC574PWT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC574PWT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC574PWT?
SN74HC574PWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC574PWT 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 SN74HC574PWT?
For technical support, including SN74HC574PWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC574PWT requirements.
6.How does Aetrix verify that SN74HC574PWT is sourced from the original manufacturer or authorized distributors?
All SN74HC574PWT 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 SN74HC574PWT meets industry standards.
7.What is the process for return or replacement of SN74HC574PWT?
All SN74HC574PWT units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC574PWT, 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 SN74HC574PWT part is unused and in its original packaging.
Return procedure for SN74HC574PWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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