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Texas Instruments SN74HC574PWRE4
- Part No.:
- SN74HC574PWRE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HC574PWRE4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,882
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Product details
Overview
SN74HC574PWRE4 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 I/O port and buffer register applications.
For engineers reviewing the SN74HC574PWRE4 datasheet, SN74HC574PWRE4 pinout, SN74HC574PWRE4 application, or SN74HC574PWRE4 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 (up to 15 loads).
Technical Context
This device implements eight independent D-type flip-flops, each capturing input data on the low-to-high transition of the CLK signal. Its buffered OE input controls all eight outputs simultaneously, placing them in high-impedance state without affecting internal latch operation - supporting dynamic bus sharing and hot-swap-safe register updates.
The SN74HC574PWRE4 uses silicon-gate CMOS technology, ensuring TTL-compatible input thresholds (VIH = 3.15 V, VIL = 1.35 V at VCC = 4.5 V), low input current (≤1 µA), and robust noise immunity. Its bus-structured pinout minimizes trace crossovers in PCB layout, and thermal resistance (RθJA = 131.8 °C/W) reflects the thermal profile of its 6.50 mm × 4.40 mm TSSOP package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - supports mixed-voltage system interfacing and battery-powered operation down to 2 V. |
| Propagation Delay (tpd) | 22 ns typical at VCC = 4.5 V - enables reliable operation up to 24 MHz clock frequency in synchronous logic designs. |
| Output Drive Strength | ±6 mA at VCC = 5 V - directly drives up to 15 LSTTL loads without external buffers or pull-ups. |
| Quiescent Current (ICC) | 80 µA max - ensures ultra-low static power consumption in always-on or low-power embedded registers. |
| Input Leakage Current | 1 µA max - prevents unintended logic transitions when inputs are tied to fixed rails or left unused. |
| 3-State Enable/Disable Time | ten = 32 ns, tdis = 26 ns typical at VCC = 4.5 V - allows fast bus arbitration and glitch-free output switching during mode changes. |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 4.40 mm body, 1.2 mm max height, 0.65 mm lead pitch, RoHS-compliant NiPdAu finish, MSL Level-1.
| 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 ≥ 20 ns at 4.5 V). |
| 2–9 (D1–D8) | Data inputs | Asynchronous parallel data inputs latched into respective Q outputs on CLK↑; must be stable ≥25 ns before CLK edge (tsu) and held ≥5 ns after (th). |
| 10 (GND) | Ground reference | Common return path for all signals and power; requires low-inductance connection to minimize ground bounce during output switching. |
| 11–18 (Q1–Q8) | 3-state outputs | Registered outputs enabled/disabled by OE; high-impedance state isolates bus lines electrically, eliminating contention during multi-driver arbitration. |
| 19 (OE) | Output enable | Active-low control: OE = low enables outputs; OE = high places all Qx in high-Z - does not affect internal latch state or clock operation. |
| 20 (VCC) | Power supply | Primary supply rail (2–6 V); requires local 0.1 µF ceramic bypass capacitor placed within 2 mm of pin for stable switching performance. |
Key Features
| Feature | Design Value |
|---|---|
| Bus-structured pinout | Minimizes PCB routing complexity by grouping D inputs (pins 2–9), Q outputs (11–18), and shared control (CLK, OE, VCC, GND) - reducing layer count and crosstalk in dense layouts. |
| High-current 3-state outputs | ±6 mA drive at 5 V eliminates need for external bus transceivers or pull-up resistors in standard TTL/LVTTL environments. |
| Low input current (≤1 µA) | Enables direct connection to microcontroller GPIOs or open-drain drivers without loading concerns, simplifying interface design. |
| Wide voltage operation (2–6 V) | Supports interoperability across 3.3 V, 5 V, and mixed-supply systems without level-shifting circuitry. |
Applications
| Industrial PLC I/O Module | Embedded Microcontroller Bus Interface |
|---|---|
Use Scenario: Isolating and latching sensor/actuator status in programmable logic controller backplanes with shared data buses. IC Role / Device Role / Timing Role: Acts as an output register holding command data until next clock edge, while OE enables/disables bus access during read-modify-write cycles. Use Value: Prevents bus contention during concurrent read/write operations and ensures deterministic timing via edge-triggered capture synchronized to PLC scan cycle. | Use Scenario: Expanding GPIO count on resource-constrained MCUs (e.g., ARM Cortex-M0+) for peripheral control and status monitoring. IC Role / Device Role / Timing Role: Functions as a parallel output port with tri-state capability, allowing the MCU to share address/data lines with other peripherals like displays or ADCs. Use Value: Enables single-bus multiplexing without external logic, reducing BOM cost and PCB area versus discrete buffer solutions. |
| Test Equipment Digital Pattern Generator | Legacy System Bus Buffer |
Use Scenario: Generating precise, synchronized digital stimulus waveforms for IC functional testing using pattern memory and clock-controlled sequencing. IC Role / Device Role / Timing Role: Stores test vector bits and presents them synchronously on rising CLK edges; OE allows dynamic waveform gating or channel blanking. Use Value: Delivers sub-25 ns timing resolution and repeatable edge alignment critical for high-speed digital test coverage. | Use Scenario: Interfacing modern microcontrollers to legacy ISA or parallel printer ports requiring TTL-level, high-drive bus drivers. IC Role / Device Role / Timing Role: Serves as a bidirectional bus driver with direction control via OE, buffering signals between mismatched logic families and load conditions. Use Value: Matches legacy bus timing (e.g., 15 LSTTL load requirement) while operating from modern 3.3 V supplies - avoiding level shifters and discrete transistor arrays. |
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 |
|---|---|---|---|
| SN74HCT574PWRE4 | CMOS input thresholds replaced with TTL-compatible VIH/VIL (2 V min/0.8 V max at 5 V); identical pinout, timing, and drive. | Better suited for direct interfacing with legacy 5 V TTL outputs without level translation. | Select when driving from standard TTL or older microcontrollers with marginal CMOS high-level output voltage. |
| 74LCX574MTCX | Lower VCC range (2.0–3.6 V), higher speed (tpd = 6.5 ns typ at 3.3 V), 3.6 V tolerant inputs; different pinout (SOIC-20 vs TSSOP-20). | Optimized for 3.3 V-only systems requiring faster throughput and lower power than HC family. | Choose for new 3.3 V designs prioritizing speed and power efficiency over 5 V compatibility or footprint reuse. |
Compared with SN74HC574PWRE4, SN74HCT574PWRE4 offers guaranteed TTL-input compatibility at 5 V but no voltage flexibility below 4.5 V, while 74LCX574MTCX provides superior speed and 3.3 V efficiency at the cost of 5 V operation and non-drop-in packaging - making SN74HC574PWRE4 the optimal choice for broad-voltage, pin-compatible bus register needs.
Availability
SN74HC574PWRE4 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, embedded microcontroller bus interfaces, and test equipment digital pattern generators requiring stable component supply and long-term manufacturability.
Supply support for SN74HC574PWRE4 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 for industrial, automotive, and communications markets.
The SN74HC574PWRE4 belongs to TI's industry-standard 74HC logic family, engineered for robust, low-power, wide-voltage digital interfacing - particularly targeting bus-driven register, I/O expansion, and data capture applications in cost-sensitive and reliability-critical systems.
FAQ
What is the maximum clock frequency supported by SN74HC574PWRE4?
The SN74HC574PWRE4 supports up to 24 MHz at VCC = 4.5 V and TA = 25 °C, per its recommended operating conditions. At 6 V, maximum frequency rises to 28 MHz under same conditions. Real-world operation depends on load capacitance (CL = 50 pF specified) and board layout - exceeding these limits risks setup/hold violations and metastability.
Does SN74HC574PWRE4 require external pull-up resistors on its 3-state outputs?
No, SN74HC574PWRE4 does not require external pull-up resistors on its Q outputs. Its high-current 3-state outputs (±6 mA at 5 V) can directly drive bus lines or up to 15 LSTTL loads. Pull-ups are only needed if the system bus requires weak-high default states during high-Z periods - a design choice, not a device requirement.
Can SN74HC574PWRE4 operate reliably at 3.3 V supply voltage?
Yes, SN74HC574PWRE4 is fully specified for operation at 3.3 V. Its recommended operating range is 2 V to 6 V, with verified VIH = 2.31 V and VIL = 1.09 V at 3.3 V (interpolated from datasheet tables), ensuring clean logic thresholds and 22 ns typical propagation delay - making it ideal for mixed-voltage 3.3 V/5 V system interfacing.
What is the function of the OE pin on SN74HC574PWRE4?
The OE (output enable) pin on SN74HC574PWRE4 is an active-low control that places all eight Q outputs simultaneously into high-impedance state when asserted high. It does not affect internal flip-flop operation - data continues to be latched on CLK↑ regardless of OE state, enabling seamless bus arbitration and register updates without disrupting stored values.
Is SN74HC574PWRE4 pin-compatible with other packages in the same family?
Yes, SN74HC574PWRE4 shares identical pinout and functionality with all 20-pin variants of the SN74HC574 family (e.g., SOIC DW, SSOP DB, PDIP N). The TSSOP (PW) package maintains the same signal mapping and electrical behavior - allowing direct PCB footprint substitution where mechanical constraints permit, though thermal and soldering profiles differ.
SN74HC574PWRE4 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:
- Discontinued at Digi-Key
- 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
SN74HC574PWRE4 FAQ
1.How can I place an order for SN74HC574PWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC574PWRE4 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 SN74HC574PWRE4 reliable?
The price and inventory of SN74HC574PWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC574PWRE4 is usually 5 days.
3.What payment methods are accepted for SN74HC574PWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC574PWRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC574PWRE4?
SN74HC574PWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC574PWRE4 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 SN74HC574PWRE4?
For technical support, including SN74HC574PWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC574PWRE4 requirements.
6.How does Aetrix verify that SN74HC574PWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74HC574PWRE4 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 SN74HC574PWRE4 meets industry standards.
7.What is the process for return or replacement of SN74HC574PWRE4?
All SN74HC574PWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC574PWRE4, 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 SN74HC574PWRE4 part is unused and in its original packaging.
Return procedure for SN74HC574PWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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