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Texas Instruments SN74HCT574PWRG4
- Part No.:
- SN74HCT574PWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HCT574PWRG4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,527
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Product details
Overview
SN74HCT574PWRG4 from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state noninverting outputs, designed for bus interface and data latching in 5V TTL-compatible digital systems. It operates from 4.5V to 5.5V, delivers ±6mA output drive, features 22ns typical propagation delay, and supports 24MHz maximum clock frequency at 5V - enabling reliable register buffering in microcontroller I/O expansion and memory address/data bus isolation.
For engineers reviewing the SN74HCT574PWRG4 datasheet, SN74HCT574PWRG4 pinout, SN74HCT574PWRG4 application, or SN74HCT574PWRG4 equivalent, key selection criteria include its 3-state bus-driving capability, TTL-input compatibility, low 80μA max ICC quiescent current, and TSSOP-20 package suitability for space-constrained industrial control and embedded peripheral interfaces.
Technical Context
This device implements eight independent D-type latches triggered on the rising edge of CLK, with dual output-enable inputs (1OE and 2OE) controlling two groups of four outputs each. Its 3-state outputs support high-impedance bus release without loading signal lines, and internal logic retains stored data regardless of OE state.
The SN74HCT574PWRG4 uses HCT logic family architecture, ensuring CMOS power efficiency with TTL voltage-level input thresholds (VIH = 2V, VIL = 0.8V). It meets JEDEC standard timing requirements for tSU = 25ns (min), tH = 5ns (min), and tPD = 41ns (max at CL = 50pF, VCC = 5.5V), making it suitable for synchronous data capture in legacy 5V bus architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V–5.5V - compatible with standard 5V logic rails and tolerant of ±5% regulation variation. |
| Propagation Delay | 41ns max (CL = 50pF, VCC = 5.5V) - ensures timing margin for 24MHz bus operation with setup/hold compliance. |
| Output Drive | ±6mA at 5V - directly drives up to 15 LSTTL loads without external buffers or pull-ups. |
| Quiescent Current | 80μA max - enables low-power standby in battery-backed or energy-sensitive applications. |
| Input Compatibility | TTL-voltage level (VIH ≥ 2V, VIL ≤ 0.8V) - interoperable with legacy 74LS and microcontroller GPIOs without level shifters. |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded systems and motor control environments. |
| Package | TSSOP-20 (PW), 6.5mm × 6.4mm body - surface-mount footprint optimized for automated assembly and thermal performance. |
Pinout & Package
TSSOP-20 (PW) package: 6.50mm × 6.4mm body size, 1.2mm max height, gull-wing leads, pin 1 index marked, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Controls two independent 4-bit output groups; asserts high-impedance state when high, enabling bus sharing. |
| CLK | Clock input | Rising-edge sensitive; latches all eight D inputs simultaneously into respective Q outputs. |
| D1–D8 | Data inputs | Eight asynchronous D inputs accepting TTL-compatible logic levels for parallel data capture. |
| Q1–Q8 | 3-state outputs | Noninverting buffered outputs; tri-state when OE = high, driving low/high when enabled. |
| VCC, GND | Power supply | Single 5V supply rail with dedicated ground; requires local 0.1μF bypass capacitor per VCC pin. |
Key Features
| Feature | Design Value |
|---|---|
| Bus-structured pinout | Optimized layout minimizes trace crosstalk and simplifies PCB routing for parallel data buses. |
| High-current 3-state outputs | ±6mA drive strength eliminates need for external bus transceivers in medium-load applications. |
| Low input current | ≤1μA max - reduces fan-out loading on upstream drivers and preserves signal integrity. |
| Rising-edge clock trigger | Synchronous data capture aligned to system clock edges, supporting deterministic timing in control logic. |
| Independent output enables | Two OE pins allow partitioned bus control - e.g., separate data/address group management in memory interfaces. |
Applications
| Microcontroller I/O Expansion | Memory Address Latching |
|---|---|
|
Use Scenario: Expanding limited GPIO count of an MCU to drive multiple peripherals via parallel bus. IC Role / Device Role / Timing Role: Acts as an 8-bit output latch, capturing and holding MCU data on CLK rising edge while OE enables bus access. Use Value: Enables direct connection of 8-bit peripherals (e.g., LCD controllers, DACs) without FPGA or CPLD glue logic. |
Use Scenario: Capturing and holding upper address bits during multiplexed address/data bus cycles in 8080-style systems. IC Role / Device Role / Timing Role: Latches A8–A15 on rising CLK while AD0–AD7 remain on shared bus; OE synchronized to ALE signal. Use Value: Eliminates need for discrete address demultiplexing circuitry, reducing BOM count and board area. |
| Industrial Bus Isolation | Legacy System Data Buffering |
|
Use Scenario: Isolating noisy PLC backplane signals from sensitive sensor acquisition modules. IC Role / Device Role / Timing Role: Provides bidirectional 3-state buffering between isolated 5V domains; OE controls directionality. Use Value: Prevents ground loop coupling and signal corruption while maintaining full 5V logic swing integrity. |
Use Scenario: Interfacing modern ARM-based controllers with legacy 74LS-based logic subsystems. IC Role / Device Role / Timing Role: Bridges voltage and drive-level mismatch: accepts LS-compatible inputs and drives LS loads directly. Use Value: Avoids level-shifter ICs or resistor networks, preserving timing margins and simplifying schematic design. |
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 |
|---|---|---|---|
| SN74HCT373PW | Octal transparent latch (latch enable active-high, no clock edge sensitivity); identical 3-state drive and voltage specs. | Requires continuous LE assertion instead of edge-triggered CLK; less suitable for synchronous sampling but simpler for static hold. | Select SN74HCT373PW when latch control is level-based and timing-critical edge alignment is unnecessary. |
| 74ACT574PW | Faster propagation (2.5ns typ), higher drive (±24mA), wider VCC range (4.5–5.5V), but higher ICC (4mA typ) and stricter noise immunity. | Better suited for high-speed 5V systems requiring sub-10ns timing margins; not drop-in due to increased power and EMI sensitivity. | Choose 74ACT574PW only when SN74HCT574PWRG4's 41ns tPD is insufficient and board-level noise control is assured. |
Compared with SN74HCT574PWRG4, SN74HCT373PW offers simpler level-sensitive control but lacks precise clock-edge synchronization, while 74ACT574PW delivers superior speed at the cost of higher power and layout sensitivity - making SN74HCT574PWRG4 the optimal balance for robust, moderate-speed 5V bus interfacing.
Availability
SN74HCT574PWRG4 is available at Aetrix Electronics and suitable for industrial control panels, embedded instrumentation, and legacy system upgrades requiring stable component supply and long-term manufacturability.
Supply support for SN74HCT574PWRG4 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 over 90 years of innovation in industrial, automotive, and communications markets.
The SN74HCT574PWRG4 belongs to TI's 74HCT logic family, engineered for TTL-compatible 5V systems requiring low power, noise immunity, and bus-oriented 3-state functionality in industrial and legacy upgrade applications.
FAQ
What is the maximum clock frequency supported by the SN74HCT574PWRG4?
The SN74HCT574PWRG4 supports a maximum clock frequency of 24MHz under recommended operating conditions (VCC = 4.5V–5.5V, TA = −40°C to +85°C). This rating is derived from timing specifications including tW (minimum pulse width) and tSU/tH (setup/hold times), and assumes CL = 50pF load. At 5.5V, fMAX reaches 27MHz per datasheet Section 4.5.
Does the SN74HCT574PWRG4 require external pull-up resistors on its outputs?
No, the SN74HCT574PWRG4 does not require external pull-up resistors on its outputs. Its 3-state outputs provide active high/low drive (±6mA at 5V) when enabled and present high-impedance (IOZ ≤ ±5μA) when disabled - eliminating the need for passive termination in properly designed bus systems.
How many output-enable inputs does the SN74HCT574PWRG4 have, and what is their function?
The SN74HCT574PWRG4 has two independent active-low output-enable inputs: 1OE (pin 1) and 2OE (pin 19). They control two separate 4-bit output groups (Q1–Q4 and Q5–Q8), allowing selective bus access or partitioned data routing without affecting internal latch states or requiring additional logic.
Is the SN74HCT574PWRG4 compatible with 3.3V microcontroller GPIOs?
The SN74HCT574PWRG4 inputs are TTL-voltage compatible (VIH = 2.0V min, VIL = 0.8V max), so they accept 3.3V logic HIGH from microcontrollers. However, its outputs swing rail-to-rail at 5V and are not 3.3V-tolerant - direct connection to 3.3V-only inputs requires level translation or series resistance to avoid overstress.
What is the thermal resistance (RθJA) of the SN74HCT574PWRG4 in its TSSOP-20 package?
The SN74HCT574PWRG4 in the PW (TSSOP-20) package has a junction-to-ambient thermal resistance (RθJA) of 131.8°C/W, as specified in Section 4.3 of the datasheet. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance improves with PCB copper area and thermal vias beneath the exposed pad.
SN74HCT574PWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- 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:
- 47ns @ 5.5V, 150pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- 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
SN74HCT574PWRG4 FAQ
1.How can I place an order for SN74HCT574PWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT574PWRG4 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 SN74HCT574PWRG4 reliable?
The price and inventory of SN74HCT574PWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT574PWRG4 is usually 5 days.
3.What payment methods are accepted for SN74HCT574PWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCT574PWRG4 transactions.
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4.How is shipping managed for SN74HCT574PWRG4?
SN74HCT574PWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT574PWRG4 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 SN74HCT574PWRG4?
For technical support, including SN74HCT574PWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT574PWRG4 requirements.
6.How does Aetrix verify that SN74HCT574PWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74HCT574PWRG4 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 SN74HCT574PWRG4 meets industry standards.
7.What is the process for return or replacement of SN74HCT574PWRG4?
All SN74HCT574PWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT574PWRG4, 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 SN74HCT574PWRG4 part is unused and in its original packaging.
Return procedure for SN74HCT574PWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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