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STMicroelectronics 74AC574TTR
- Part No.:
- 74AC574TTR
- Manufacturer:
- STMicroelectronics
- Category:
- Flip Flops
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74AC574TTR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,240
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Product details
Overview
74AC574TTR from STMicroelectronics is an advanced high-speed CMOS octal D-type flip-flop with 3-state non-inverting outputs, designed for synchronous data latching in bus-oriented systems. It operates from 2V to 6V, delivers 24mA output drive, features 250MHz max clock frequency (at 5V), and supports 50Ω transmission line driving - used in industrial control backplanes and memory interface buffers.
For engineers reviewing the 74AC574TTR datasheet, 74AC574TTR pinout, 74AC574TTR application, or 74AC574TTR equivalent, key selection criteria include its edge-triggered clock input, active-low 3-state enable, symmetrical output impedance, latch-up immunity, and TSSOP-20 package compatibility with space-constrained PCB layouts.
Technical Context
The device implements eight independent D-type latches triggered on the LOW-to-HIGH clock edge, with asynchronous 3-state output control via an active-low OE input. Internal operation continues regardless of OE state - enabling data retention or update while outputs remain high-impedance.
It uses sub-micron C2MOS technology with double-layer metal wiring, delivering balanced propagation delays (tPLH ≅ tPHL), 28% VCC noise immunity, and 2kV ESD protection on all I/O pins - optimized for noise-prone industrial digital buses operating across -55°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2V to 6V - enables interoperability with 3.3V and 5V logic families without level shifters |
| Max Clock Frequency | 250MHz (typ. at VCC = 5V) - supports high-throughput data capture in real-time control loops |
| Output Drive Strength | ±24mA (min) - directly drives 50Ω transmission lines without external buffers |
| Propagation Delay | 5.0ns (tPLH/tPHL, typ. at 5V) - ensures tight timing margins in synchronous bus architectures |
| Input Noise Immunity | 28% VCC (min) - rejects common-mode noise in electrically noisy factory environments |
| Quiescent Current | 4µA (max at TA = 25°C) - minimizes standby power in battery-backed or energy-sensitive systems |
| Operating Temperature | -55°C to +125°C - qualified for under-hood automotive and industrial motor drive applications |
Pinout & Package
TSSOP-20 package: 6.5mm × 4.4mm body, 0.65mm pitch, 1.1mm height, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE | Active-low 3-state output enable - decouples outputs from bus without affecting internal latch state |
| 2–9 | D0–D7 | Data inputs - sampled on rising clock edge; tolerate 0V to VCC input voltage range |
| 11 | CK | LOW-to-HIGH edge-triggered clock - defines precise sampling instant for deterministic timing |
| 12–19 | Q0–Q7 | Non-inverting 3-state outputs - provide bidirectional bus control with symmetrical |IOH| = |IOL| = 24mA |
| 10 | GND | Ground reference - requires low-inductance connection to minimize ground bounce during switching |
| 20 | VCC | Positive supply - must be bypassed with 100nF ceramic capacitor near pin for stable high-speed operation |
Key Features
| Feature | Design Value |
|---|---|
| Edge-triggered latching | Rising-edge CK synchronizes all 8 bits simultaneously - eliminates skew-induced metastability in parallel data paths |
| Independent 3-state control | OE pin disables outputs without resetting latched data - enables multi-master bus arbitration |
| High noise immunity | VIH/VIL thresholds defined as 28% VCC - maintains logic integrity in >100mV ripple or EFT-burst environments |
| Latch-up immunity | Enhanced C2MOS process prevents destructive latch-up under transient overvoltage - critical for hot-swap interfaces |
| ESD protection | 2kV HBM on all pins - reduces need for external TVS diodes in board-level ESD design |
Applications
| Industrial PLC Backplane | Automotive Body Control Module |
|---|---|
Use Scenario: Latching sensor data from multiple analog-to-digital converters onto a shared CAN/FlexRay gateway bus. IC Role / Device Role / Timing Role: Synchronous data register buffering D/A and A/D interface signals before protocol translation. Use Value: 250MHz clock tolerance and 5ns propagation delay ensure deterministic sampling alignment across 8-channel ADC streams. | Use Scenario: Isolating microcontroller GPIOs from high-current door lock actuators and LED driver circuits. IC Role / Device Role / Timing Role: Bidirectional bus interface with OE-controlled isolation between MCU and load peripherals. Use Value: ±24mA drive strength and -55°C to +125°C rating support direct actuator control without external drivers. |
| Test Equipment Digital I/O Card | Medical Imaging Data Acquisition |
Use Scenario: Capturing high-speed digital stimulus patterns from FPGA-based pattern generators for DUT validation. IC Role / Device Role / Timing Role: Edge-triggered input capture register synchronized to system clock domain. Use Value: Balanced tPLH/tPHL and 2.5ns setup/hold windows enable reliable capture at 200+ MHz test frequencies. | Use Scenario: Buffering parallel pixel data from CMOS image sensors to FPGA-based image processing pipelines. IC Role / Device Role / Timing Role: High-fidelity data latch with low skew and minimal jitter transfer to downstream logic. Use Value: 28% VCC noise margin and 4µA quiescent current reduce EMI coupling and thermal load in enclosed diagnostic enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop with 3-state output applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AC574PWR | TI part in TSSOP-20; identical AC/DC specs but different ICC test condition (VCC=5.5V vs 5.0V) | Same industrial temperature range; slightly higher max ICC (80µA vs 40µA at -40°C to 85°C) | Select when TI supply chain preference or dual-sourcing strategy applies |
| 74LVC574APW | NXP part; 1.65–3.6V VCC range only; lower drive (24mA @ 3.3V, not 5V); 3.3V-only compatible | Not suitable for mixed 5V/3.3V systems; lacks -55°C rating; intended for portable low-voltage designs | Choose only for 3.3V-only applications where extended temperature range is unnecessary |
Compared with SN74AC574PWR and 74LVC574APW, the 74AC574TTR uniquely supports full 2–6V operation with guaranteed -55°C performance and 50Ω line driving - making it the sole option for ruggedized 5V industrial or automotive bus interfaces requiring wide-VCC flexibility and extreme-temperature reliability.
Availability
74AC574TTR is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, and medical imaging data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74AC574TTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with vertical manufacturing and broad IP portfolio.
The 74AC logic family targets high-speed, low-power, and robust industrial digital interfacing - designed specifically for noise-immune bus buffering, data latching, and signal conditioning in harsh electromagnetic environments.
FAQ
What is the minimum pulse width required on the clock input for reliable operation?
The minimum HIGH and LOW clock pulse width is 4.0ns (max) at VCC = 5.0V across -40°C to +85°C. This ensures sufficient time for internal C2MOS latching circuitry to resolve metastability and guarantees setup/hold compliance for D-input transitions. Pulse widths below this threshold risk missed clock edges or invalid Q-state updates.
Can the 74AC574TTR operate reliably with a 3.3V supply?
Yes - the device is fully specified from 2V to 6V, including 3.3V operation. At VCC = 3.3V, it delivers 220MHz max clock frequency (typ.), 13.5ns propagation delay, and maintains 28% VCC noise immunity. All DC and AC parameters in the datasheet include 3.3V test conditions, confirming robust functionality in mixed-voltage systems.
Is the output enable (OE) pin internally pulled up or down?
No internal pull-up or pull-down exists on the OE pin. It is a CMOS input with ±0.1µA leakage at 5.5V, requiring explicit external biasing in floating or high-impedance states. For fail-safe operation, tie OE to GND via a 10kΩ resistor when 3-state disable is required at power-up.
Does the 74AC574TTR support hot insertion into a live bus?
While the device features 2kV HBM ESD protection and improved latch-up immunity, it is not explicitly qualified for hot-insertion. The absence of powered-off input protection (Ioff) means D and Q pins may sink current if driven while VCC is absent. Use external series resistors or dedicated hot-swap controllers for true live-insertion capability.
74AC574TTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74AC
- 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:
- 250 MHz
- Max Propagation Delay @ V, Max CL:
- 9.5ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 4 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74AC574TTR FAQ
1.How can I place an order for 74AC574TTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC574TTR 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 74AC574TTR reliable?
The price and inventory of 74AC574TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC574TTR is usually 5 days.
3.What payment methods are accepted for 74AC574TTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC574TTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC574TTR?
74AC574TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC574TTR 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 74AC574TTR?
For technical support, including 74AC574TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC574TTR requirements.
6.How does Aetrix verify that 74AC574TTR is sourced from the original manufacturer or authorized distributors?
All 74AC574TTR 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 74AC574TTR meets industry standards.
7.What is the process for return or replacement of 74AC574TTR?
All 74AC574TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74AC574TTR, 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 74AC574TTR part is unused and in its original packaging.
Return procedure for 74AC574TTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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