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Texas Instruments SN74HC574AN
- Part No.:
- SN74HC574AN
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74HC574AN.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:813
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Product details
Overview
SN74HC574AN 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 ports and register buffers.
For engineers reviewing the SN74HC574AN datasheet, SN74HC574AN pinout, SN74HC574AN application, or SN74HC574AN equivalent, key selection criteria include its 20-pin PDIP package, clock-edge-triggered data capture, independent 3-state output enable (OE), and compatibility with LSTTL bus loads up to 15 units without external pull-ups.
Technical Context
This device implements eight identical D-type flip-flops, each capturing input data on the low-to-high transition of CLK while maintaining independent Q outputs. The buffered OE input controls all eight outputs simultaneously, placing them in high-impedance state without affecting internal latch states - supporting hot-swap bus arbitration and multi-master system design.
Its CMOS architecture ensures low static current (≤1 µA input leakage, ≤80 µA ICC), rail-to-rail output swing (VOH ≥ 4.4 V, VOL ≤ 0.26 V at 4.5 V), and robust noise immunity (VIH = 3.15 V, VIL = 1.35 V at VCC = 4.5 V), making it suitable for mixed-voltage interfacing between HC logic families and legacy TTL subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 2 V to 6 V - supports direct interface with 3.3 V and 5 V logic domains without level shifters. |
| Propagation delay (tpd) | 22 ns typical at VCC = 4.5 V - enables reliable operation up to 24 MHz clock frequency in synchronous bus applications. |
| Output drive | ±6 mA at 5 V - directly drives 15 LSTTL loads without external buffers or pull-up resistors. |
| Input leakage current | ≤1 µA max - prevents unintended logic transitions when inputs are tied to VCC/GND for unused pins. |
| 3-state enable timing | ten = 38 ns, tdis = 32 ns at VCC = 6 V - ensures clean bus release and acquisition during multiplexed data transfers. |
| Operating temperature | –40 °C to +85 °C - qualified for industrial-grade embedded control and instrumentation environments. |
| Power dissipation capacitance | 100 pF per flip-flop - enables accurate dynamic power estimation in high-speed clocked systems. |
Pinout & Package
SN74HC574AN uses a 20-pin Plastic Dual In-line Package (PDIP) with 25.40 mm × 6.35 mm body size, through-hole mounting, and standard 0.3-inch row spacing. Pin 1 is located at the top-left corner with notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CLK) | Clock input | Edge-sensitive input; data latched on low-to-high transition - defines synchronous sampling point for all eight registers. |
| 2–9 (D1–D8) | Data inputs | Asynchronous parallel inputs; each feeds one D-type latch - accepts standard CMOS/TTL logic levels. |
| 10 (GND) | Ground reference | Common return path for all signals and power - must be low-impedance to minimize ground bounce in bus-driving mode. |
| 11–18 (Q1–Q8) | 3-state outputs | Tri-stateable latched outputs; high-impedance when OE = high - enables shared bus topology without contention. |
| 19 (OE) | Output enable | Active-low control; asserts all Q outputs simultaneously - decouples bus control from clock/data timing. |
| 20 (VCC) | Positive supply | Primary power rail; bypass capacitor (0.1 µF) required near pin to suppress switching noise during output transitions. |
Key Features
| Feature | Design Value |
|---|---|
| Bus-structured pinout | Input (D1–D8) and output (Q1–Q8) pins aligned on opposite sides - simplifies PCB routing for parallel data buses and reduces trace crosstalk. |
| High-current 3-state outputs | ±6 mA drive capability at 5 V - eliminates need for external bus transceivers in medium-load industrial backplanes. |
| Low power consumption | 80 µA max ICC - enables use in battery-backed or energy-constrained register storage applications. |
| Wide voltage operation | 2 V to 6 V supply range - allows interoperability across 3.3 V microcontrollers and 5 V peripheral subsystems. |
| Independent OE control | OE does not affect internal latch state - permits data retention during bus arbitration or firmware reconfiguration sequences. |
Applications
| Industrial I/O Port Expansion | Microcontroller Bus Interface |
|---|---|
Use Scenario: Adding parallel digital I/O capability to PLC modules using limited GPIO resources. IC Role / Device Role / Timing Role: Acts as an 8-bit output latch and input buffer, synchronized to system clock edges for deterministic read/write timing. Use Value: Enables single-cycle data capture and update via shared address/data bus, reducing MCU firmware overhead and eliminating software bit-banging delays. |
Use Scenario: Interfacing an 8-bit microcontroller with external memory-mapped peripherals requiring stable data hold time. IC Role / Device Role / Timing Role: Serves as address/data latch between multiplexed AD bus and peripheral devices, triggered by ALE or WR signal. Use Value: Provides precise setup/hold timing (tsu = 25 ns, th = 5 ns at 4.5 V) to meet legacy memory access requirements without custom timing logic. |
| Legacy TTL System Upgrade | Test Equipment Data Capture |
Use Scenario: Replacing obsolete 74LS374 in aging test fixtures while maintaining pin compatibility and timing behavior. IC Role / Device Role / Timing Role: Functions as drop-in replacement for octal D-latch with 3-state outputs, preserving existing PCB layout and firmware. Use Value: Delivers identical functional behavior with lower power (80 µA vs. ~30 mA for LS) and improved noise margin (VIH = 3.15 V at 4.5 V). |
Use Scenario: Capturing parallel sensor or ADC output streams in automated test equipment with precise trigger alignment. IC Role / Device Role / Timing Role: Latches asynchronous parallel data on system clock edge, then presents stable values to downstream FPGA or processor. Use Value: Guarantees 22 ns typical tpd and 5 ns minimum hold time - ensures deterministic sampling window for high-reliability measurement cycles. |
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 |
|---|---|---|---|
| SN74HCT574N | CMOS input thresholds compatible with TTL voltage levels (VIH = 2 V min), higher ICC (160 µA max), same pinout and timing. | Better suited for mixed 5 V TTL/CMOS systems where input noise margins are marginal. | Select when interfacing directly with legacy 74LS/74ALS outputs without level translation. |
| 74AC574N | Faster tpd (10 ns typ at 5 V), higher output drive (±24 mA), wider VCC range (2 V–6 V), but higher ICC (40 mA max). | Preferred in high-speed data acquisition where propagation delay dominates system timing budget. | Choose when >30 MHz operation or driving heavy capacitive loads (>50 pF) is required. |
Compared with SN74HC574AN, SN74HCT574N offers TTL-compatible inputs for legacy integration, while 74AC574N provides superior speed and drive strength at the cost of higher power - making SN74HC574AN the optimal balance of low power, industrial temperature range, and bus-driving capability.
Availability
SN74HC574AN is available at Aetrix Electronics and suitable for industrial I/O expansion, microcontroller bus interfacing, legacy TTL system upgrades, and test equipment data capture requiring stable component supply across long production lifecycles.
Supply support for SN74HC574AN 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 electronics.
SN74HC574AN belongs to TI's 74HC logic family - engineered for low-power, high-noise-immunity digital interfacing in industrial control, instrumentation, and legacy system modernization applications.
FAQ
What is the maximum clock frequency supported by SN74HC574AN?
SN74HC574AN supports up to 24 MHz maximum clock frequency at VCC = 4.5 V and TA = 25 °C, as specified in the timing requirements table. At 6 V supply, fmax reaches 28 MHz under the same conditions. Real-world operation depends on load capacitance and board layout - CL = 50 pF is used for characterization, and performance degrades with higher capacitance.
Does SN74HC574AN require external pull-up resistors on its 3-state outputs?
No, SN74HC574AN does not require external pull-up resistors on its Q1–Q8 outputs when used in high-impedance mode. Its 3-state outputs present negligible leakage (IOZ ≤ 5 µA) and are designed to drive bus lines directly or up to 15 LSTTL loads in active mode - pull-ups are only needed if bus idle-state logic level must be actively held.
Can SN74HC574AN operate reliably at 3.3 V supply voltage?
Yes, SN74HC574AN is fully specified for operation at 3.3 V (within its 2 V–6 V range). At VCC = 3.3 V, VIH = 2.31 V, VIL = 0.99 V, VOH ≥ 3.17 V, VOL ≤ 0.36 V, and tpd ≈ 30 ns - meeting standard 3.3 V CMOS interface requirements and ensuring compatibility with modern microcontrollers.
How should unused input pins be handled on SN74HC574AN?
All unused input pins on SN74HC574AN - including D1–D8, CLK, and OE - must be tied to either VCC or GND to prevent floating states that cause excessive current draw or metastability. TI recommends connecting unused D inputs to GND and OE to VCC (to disable outputs) unless active control is required - never leave inputs unconnected.
Is SN74HC574AN pin-compatible with the older 74LS374?
Yes, SN74HC574AN is pin-compatible with 74LS374 in the 20-pin PDIP package, sharing identical pin assignments for CLK, D1–D8, Q1–Q8, OE, VCC, and GND. However, SN74HC574AN has different electrical characteristics - notably lower power, higher noise immunity, and CMOS input thresholds - so system-level timing and voltage validation is required before substitution.
SN74HC574AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 84 MHz
- Max Propagation Delay @ V, Max CL:
- 33ns @ 6V, 150pF
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74HC574AN FAQ
1.How can I place an order for SN74HC574AN through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC574AN 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 SN74HC574AN reliable?
The price and inventory of SN74HC574AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC574AN is usually 5 days.
3.What payment methods are accepted for SN74HC574AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC574AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC574AN?
SN74HC574AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC574AN 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 SN74HC574AN?
For technical support, including SN74HC574AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC574AN requirements.
6.How does Aetrix verify that SN74HC574AN is sourced from the original manufacturer or authorized distributors?
All SN74HC574AN 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 SN74HC574AN meets industry standards.
7.What is the process for return or replacement of SN74HC574AN?
All SN74HC574AN units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC574AN, 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 SN74HC574AN part is unused and in its original packaging.
Return procedure for SN74HC574AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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