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Texas Instruments SN74AC574PW
- Part No.:
- SN74AC574PW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AC574PW.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:197
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Product details
Overview
SN74AC574PW from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state outputs, designed for bus interface and data latching in digital systems operating from 2V to 6V. It features 20-pin TSSOP packaging, 8.5ns max propagation delay at 5V, and supports bidirectional bus driving with active-low output enable control. It is used in I/O port expansion and buffer register applications within industrial control and embedded communication interfaces.
For engineers reviewing the SN74AC574PW datasheet, SN74AC574PW pinout, SN74AC574PW application, or SN74AC574PW equivalent, this page delivers verified electrical specs, functional timing behavior, package dimensions, real-world use cases, and validated alternative parts - all grounded in TI's SCAS541G production datasheet (March 2024 revision).
Technical Context
The SN74AC574PW implements eight independent D-type flip-flops synchronized to the rising edge of CLK, capturing input data (D1–D8) and presenting it at Q1–Q8 outputs. Its 3-state outputs are controlled by an active-low OE signal that places all outputs in high-impedance without affecting internal latch state.
It operates across a wide VCC range (2V–6V), accepts input voltages up to 6V regardless of supply, and delivers ±24mA drive capability at 5V. Timing parameters are specified separately for 3.3V and 5V operation, with fmax = 85MHz and tPLH/tPHL ≤ 11ns at 5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - enables interoperability across 3.3V and 5V logic domains without level shifters. |
| Max Propagation Delay | 8.5ns at VCC = 5V - supports high-speed synchronous data capture up to 85MHz clock frequency. |
| Output Drive Strength | ±24mA at VCC = 5V - directly drives standard TTL/CMOS loads and moderately capacitive bus lines. |
| Input Voltage Tolerance | Up to 6V - allows safe interfacing with higher-voltage peripherals or legacy 5V signals even when VCC = 3.3V. |
| 3-State Enable Logic | Active-low OE - simplifies bus arbitration in shared-data-path systems using open-drain or wired-OR control schemes. |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded applications including motor control and PLC I/O modules. |
| Power Dissipation Capacitance | 40pF at 5V/1MHz - enables accurate dynamic power estimation during system-level thermal analysis. |
Pinout & Package
TSSOP-20 (PW) package: 6.5mm × 6.4mm body size, 1.2mm max height, 0.65mm lead pitch, thermal pad (optional GND connection). RoHS-compliant, NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low output enable | Disables all Q outputs simultaneously into high-impedance; does not affect internal latch state or clock sensitivity. |
| 2–9 (D1–D8) | Data inputs | Asynchronous inputs sampled on rising CLK edge; tolerate up to 6V regardless of VCC setting. |
| 10 (GND) | Ground reference | Primary return path for logic and output current; must be low-impedance for stable timing and noise immunity. |
| 11 (CLK) | Clock input | Rising-edge-triggered global clock for all eight flip-flops; requires clean edge with ≤8ns/V input transition rate. |
| 12–19 (Q8–Q1) | 3-state outputs | True-level outputs reflecting captured D-inputs; enter high-Z when OE = HIGH; drive bus lines directly. |
| 20 (VCC) | Positive supply | Single supply rail supporting 2V–6V operation; bypass capacitor (0.1μF) required near pin for switching noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range | 2V–6V operation eliminates need for separate voltage rails when interfacing mixed-supply subsystems. |
| Input overvoltage tolerance | Inputs accept up to 6V independent of VCC - enables safe connection to 5V buses while powered from 3.3V. |
| High-speed timing | 8.5ns max tPD at 5V and 85MHz fmax allow use in fast parallel data paths such as memory-mapped I/O. |
| Bus-compatible 3-state outputs | Simultaneous high-impedance control via single OE pin simplifies multi-device bus sharing without external logic. |
| Industrial temperature rating | −40°C to +85°C operation ensures reliability in factory automation, instrumentation, and outdoor embedded systems. |
Applications
| Industrial I/O Expansion | Microcontroller Parallel Interface |
|---|---|
|
Use Scenario: Adding 8-bit parallel input/output capability to a microcontroller with limited GPIO resources in a programmable logic controller (PLC) module. IC Role / Device Role / Timing Role: Acts as a buffered, edge-triggered input latch and tri-state output driver, synchronizing external sensor/actuator signals to the MCU clock domain. Use Value: Enables deterministic sampling of asynchronous field signals and safe bidirectional bus control without software overhead or external glue logic. |
Use Scenario: Interfacing an FPGA or ASIC with legacy parallel peripherals (e.g., LCD controllers, SRAM, or keypad matrices) requiring precise timing and bus contention management. IC Role / Device Role / Timing Role: Serves as a clock-synchronized data register and bus transceiver, isolating the FPGA core from load variations on shared address/data lines. Use Value: Provides guaranteed setup/hold timing margins (tsu = 2ns, th = 1.5ns at 5V), eliminating metastability risk during high-speed read/write cycles. |
| Digital Test Equipment Bus Driver | Automated Test Fixture Data Capture |
|
Use Scenario: Driving multiple DUT (device-under-test) pins simultaneously in automated boundary-scan test systems where signal integrity and fanout matter. IC Role / Device Role / Timing Role: Functions as a low-skew, high-drive bus driver with configurable output enable, allowing selective activation of test signal groups. Use Value: Delivers ±24mA per output at 5V, ensuring robust logic levels across long PCB traces and multiple parallel loads without signal degradation. |
Use Scenario: Capturing parallel status bits from electromechanical sensors (e.g., limit switches, relay banks) in manufacturing test fixtures with real-time logging requirements. IC Role / Device Role / Timing Role: Operates as a synchronized input sampler, latching switch states on a system clock edge to eliminate contact bounce artifacts. Use Value: Supports 85MHz clocking and 8.5ns propagation delay, enabling sub-12ns sampling resolution for high-throughput fixture validation. |
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 |
|---|---|---|---|
| SN74LVC574APW | Lower VCC range (1.65V–3.6V); 3.3V-only optimized; 6.7ns tPD at 3.3V; lower drive (±24mA @ 3.3V only). | Better suited for modern low-voltage FPGAs and battery-powered systems; incompatible with 5V buses. | Select when operating exclusively at 3.3V and requiring lower static current (ICC = 10μA typical vs. 40μA for SN74AC574PW). |
| 74ACT574PW | Same pinout and function; higher drive (±24mA @ 5V); identical AC specs; slightly higher ICC (50μA typical). | Drop-in replacement for SN74AC574PW in 5V-only designs requiring marginally better noise immunity (VIH = 3.5V min). | Choose when legacy 5V TTL compatibility and robust noise margins are prioritized over wide-VCC flexibility. |
Compared with SN74AC574PW, SN74LVC574APW trades wide-supply operation for lower voltage compliance and reduced power, while 74ACT574PW retains full 5V compatibility with enhanced input thresholds - making SN74AC574PW the optimal choice for mixed-voltage bus bridging.
Availability
SN74AC574PW is available at Aetrix Electronics and suitable for industrial I/O expansion, microcontroller parallel interface, and automated test fixture design requiring stable component supply and long-term lifecycle support.
Supply support for SN74AC574PW 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 SNx4AC574 series was developed to deliver high-speed, wide-supply-voltage octal latches for bus-oriented digital systems - targeting industrial control, test equipment, and legacy interface bridging where reliability and interoperability are critical.
FAQ
What is the maximum clock frequency supported by the SN74AC574PW?
The SN74AC574PW supports a maximum clock frequency of 85MHz under recommended operating conditions at VCC = 5V ± 0.5V. At VCC = 3.3V ± 0.3V, the maximum frequency is 60MHz. These values are measured with CL = 50pF and defined timing margins (tsu = 2ns, th = 1.5ns at 5V), as confirmed in Section 4.6 of the SCAS541G datasheet.
Does the SN74AC574PW support mixed-voltage operation between 3.3V and 5V systems?
Yes, the SN74AC574PW supports true mixed-voltage operation: it functions correctly with VCC = 3.3V while accepting 5V-tolerant inputs (D1–D8, CLK, OE), enabling direct interfacing between 3.3V controllers and 5V peripherals without external level shifters - a key capability verified in Section 4.2 and Feature list of the SN74AC574PW datasheet.
What is the purpose of the thermal pad on the SN74AC574PW package?
The thermal pad on the SN74AC574PW (TSSOP-20) may be connected to GND or left floating - it is not electrically required for functionality. When connected to GND, it improves thermal dissipation and reduces junction-to-board thermal resistance; however, no internal connection exists, so it does not affect logic operation. This is explicitly stated in Table 3-1 and the mechanical drawings of the SCAS541G datasheet.
Can the SN74AC574PW outputs drive standard TTL loads directly?
Yes, the SN74AC574PW outputs can drive standard TTL loads directly: at VCC = 5V, it delivers VOH ≥ 4.94V (IOH = −24mA) and VOL ≤ 0.44V (IOL = 24mA), exceeding TTL VIH (2.0V) and VIL (0.8V) thresholds with ample noise margin. This capability is documented in Section 4.4 Electrical Characteristics of the SN74AC574PW datasheet.
Is the SN74AC574PW pin-compatible with other members of the SN74x574 family?
Yes, the SN74AC574PW shares identical pin configuration and function mapping with all SN74x574 variants in TSSOP-20 (PW) packaging, including SN74LVC574APW and SN74ACT574PW. Pin functions (OE, D1–D8, CLK, Q1–Q8, GND, VCC) and physical layout match exactly - confirmed in Figure 3-1 and Table 3-1 of the SCAS541G datasheet.
SN74AC574PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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:
- 153 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:
- 4.5 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74AC574PW FAQ
1.How can I place an order for SN74AC574PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC574PW 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 SN74AC574PW reliable?
The price and inventory of SN74AC574PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC574PW is usually 5 days.
3.What payment methods are accepted for SN74AC574PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC574PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AC574PW?
SN74AC574PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC574PW 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 SN74AC574PW?
For technical support, including SN74AC574PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC574PW requirements.
6.How does Aetrix verify that SN74AC574PW is sourced from the original manufacturer or authorized distributors?
All SN74AC574PW 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 SN74AC574PW meets industry standards.
7.What is the process for return or replacement of SN74AC574PW?
All SN74AC574PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC574PW, 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 SN74AC574PW part is unused and in its original packaging.
Return procedure for SN74AC574PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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