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onsemi 74LCX574WM
- Part No.:
- 74LCX574WM
- Manufacturer:
- onsemi
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74LCX574WM.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,437
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Product details
Overview
74LCX574WM from Fairchild Semiconductor is a low-voltage octal D-type flip-flop with 5V-tolerant inputs and outputs, designed for level-shifting between 2.3–3.6V logic domains and 5V signal environments. It features 7.5ns max propagation delay at VCC = 3.3V, ±24mA output drive at 3.0V, and 3-STATE outputs controlled by a common buffered OE input. Used in bus interface and data latching applications in mixed-voltage embedded systems.
For engineers reviewing the 74LCX574WM datasheet, pinout, applications, or equivalent options, key selection criteria include 5V tolerance, 3.3V-compatible timing, high-impedance output control, live insertion support, and SOIC-20 package compatibility with JEDEC MS-013 footprint.
Technical Context
The 74LCX574WM implements eight edge-triggered D-type flip-flops sharing a common LOW-to-HIGH clock (CP) transition and a buffered 3-STATE Output Enable (OE). Its patented noise/EMI reduction circuitry minimizes switching transients during output transitions, critical in dense PCB layouts.
All inputs and outputs tolerate up to 5.5V regardless of VCC (2.3–3.6V), enabling safe interfacing with legacy 5V peripherals without external level shifters. Power-down behavior ensures high-impedance inputs and outputs when unpowered, supporting hot-swap capability when OE is pulled up via external resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V–3.6V - Enables operation in modern low-power 3.3V systems while maintaining backward compatibility with 2.5V domains. |
| Propagation Delay (tPD) | 7.5ns max at VCC = 3.3V - Supports >150MHz clock frequency in synchronous data capture paths. |
| Output Drive | ±24mA at VCC = 3.0V - Sufficient to drive multiple LVTTL loads or short PCB traces without buffering. |
| Input/Output Voltage Tolerance | 0–5.5V - Allows direct connection to 5V buses without clamping diodes or external translators. |
| Quiescent ICC | 10µA max - Minimizes standby power in battery-backed or always-on subsystems. |
| ESD Rating | HBM > 2000V - Provides robust handling margin during board assembly and field service. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded control and communications equipment. |
Pinout & Package
74LCX574WM is housed in a 20-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-013, 0.300" wide (M20B), with standard 1.27mm pitch and gull-wing leads suitable for reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | D0–D7 Data Inputs | Asynchronous parallel data inputs latched on CP rising edge; 5V tolerant, CMOS-compatible thresholds. |
| 9 | GND | Ground reference for all internal logic and I/O; must be connected before VCC for proper power sequencing. |
| 10, 11, 12, 13, 14, 15, 16, 17 | O0–O7 3-STATE Outputs | True-level outputs enabled when OE = LOW; high-impedance when OE = HIGH; ±24mA drive capability. |
| 18 | CP Clock Pulse Input | Edge-triggered clock input; latches D-input states on LOW-to-HIGH transition; 5V tolerant, Schmitt-triggered for noise immunity. |
| 19 | OE Output Enable Input | Active-LOW control for 3-STATE outputs; must be pulled up to VCC via external resistor during power-up/down to ensure Hi-Z state. |
| 20 | VCC | Primary supply rail (2.3–3.6V); powers internal logic and output drivers; decoupling capacitor required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant I/O | Enables seamless integration into mixed-voltage systems without external level translation circuitry. |
| Live insertion/withdrawal support | Guarantees safe hot-plug operation in backplane or modular systems when OE is properly biased during power transitions. |
| Patented noise/EMI reduction | Reduces simultaneous switching noise (SSN) and radiated emissions in high-density digital boards. |
| Power-down high-impedance I/O | Prevents bus contention and current leakage when VCC is absent or ramping, simplifying power sequencing design. |
| Latch-up immunity | Exceeds JEDEC 78 conditions, ensuring robustness against transient overvoltage events in harsh environments. |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
|
Use Scenario: Latching sensor status signals from 5V analog front-ends into a 3.3V microcontroller domain. IC Role / Device Role / Timing Role: Octal D-flip-flop acting as synchronized input register with common clock and 3-STATE output isolation. Use Value: Eliminates need for discrete level shifters while providing setup/hold time compliance and ESD-hardened I/O for factory-floor environments. |
Use Scenario: Buffering switch inputs (door locks, window controls) before feeding to CAN/LIN gateway MCU. IC Role / Device Role / Timing Role: Input capture latch with glitch-free sampling on CP edge and OE-controlled bus isolation. Use Value: 5V tolerance accommodates automotive 5V supply rails; ±24mA drive supports long harness runs; -40°C to +85°C rating meets AEC-Q100 ambient requirements. |
| Communications Backplane Interface | Test Equipment Digital Pattern Generator |
|
Use Scenario: Isolating and synchronizing control signals between 5V FPGA configuration logic and 3.3V SERDES PHY layers. IC Role / Device Role / Timing Role: Level-shifting register with precise tPD (7.5ns max) and skew <1.0ns across outputs. Use Value: Ensures deterministic timing alignment across eight parallel control lines; 3-STATE outputs prevent backplane contention during reconfiguration. |
Use Scenario: Generating stable, synchronized 8-bit stimulus patterns for DUT testing under variable VCC conditions. IC Role / Device Role / Timing Role: Parallel pattern latch with programmable enable/disable via OE and precise clock-edge registration. Use Value: Low ICC (10µA) enables battery-powered portable testers; 5V-tolerant inputs accept TTL/CMOS test vectors directly; SOIC-20 allows easy socketing on test fixtures. |
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 |
|---|---|---|---|
| 74LVC574APW | Same 3.3V VCC range and 5V-tolerant I/O, but uses TSSOP-20 package (4.4mm wide); tPD = 6.2ns max at 3.3V. | Higher pin density layout; lacks patented EMI reduction circuitry; lower ICC (5µA). | Select when board space is constrained and EMI mitigation is handled elsewhere in system design. |
| SN74LVCH16374ADGGR | 16-bit version in 48-pin TSSOP; dual 8-bit banks with independent OE; VCC = 1.65–3.6V; 5V-tolerant. | Supports wider data buses; requires more PCB area and routing complexity; higher channel count increases static power. | Select when expanding to 16-bit parallel interfaces or requiring bank-selectable output control. |
Compared with 74LCX574WM, the 74LVC574APW offers faster timing in a smaller footprint but omits EMI suppression, while the SN74LVCH16374ADGGR scales channel count at the cost of layout complexity and power-making 74LCX574WM optimal for cost-sensitive, noise-critical 8-bit latching where SOIC-20 is acceptable.
Availability
74LCX574WM is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and communications infrastructure requiring stable component supply and long-term obsolescence management.
Supply support for 74LCX574WM 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, signal conditioning, and logic ICs before its acquisition by ON Semiconductor in 2016. Its legacy logic families remain widely deployed in industrial and automotive systems.
The 74LCX series was engineered for low-voltage, high-speed logic interoperability across mixed-supply systems, emphasizing 5V tolerance, EMI resilience, and hot-swap readiness in real-world embedded applications.
FAQ
What is the maximum clock frequency supported by the 74LCX574WM?
The 74LCX574WM supports a maximum clock frequency of 150MHz under recommended operating conditions (VCC = 3.3V, CL = 50pF). This is derived from its 7.5ns maximum propagation delay and verified AC electrical characteristics in the official datasheet. The 74LCX574WM maintains timing integrity across its full industrial temperature range (–40°C to +85°C).
Does the 74LCX574WM require external pull-up resistors on the OE pin?
Yes - to guarantee high-impedance outputs during power-up or power-down sequences, the OE pin of the 74LCX574WM must be tied to VCC through an external pull-up resistor. The minimum resistance value depends on the driver's current-sourcing capability, as specified in the datasheet's Application Note section. This prevents undefined output states that could cause bus contention.
Can the 74LCX574WM operate reliably at 2.5V VCC?
Yes - the 74LCX574WM is fully specified for operation at 2.5V VCC (within the 2.3–3.6V range), with verified AC and DC parameters including tPD ≤ 10.5ns, IOH/IOL ≥ ±8mA, and VIH/VIL thresholds adjusted for lower supply. All 5V-tolerant I/O functionality remains active, making it suitable for battery-powered or low-power 2.5V systems.
Is the 74LCX574WM pin-compatible with the 74LCX374?
No - although the 74LCX574WM and 74LCX374 are functionally identical octal D-type flip-flops with 5V-tolerant I/O and shared VCC specifications, the datasheet explicitly states they differ in pinout. Interchanging them without PCB layout revision will result in incorrect signal routing and functional failure.
What package type does the 74LCX574WM use, and is it RoHS-compliant?
The 74LCX574WM uses a 20-lead SOIC package (JEDEC MS-013, 0.300" wide, M20B) and is lead-free per JEDEC J-STD-020B. All variants, including this part, comply with RoHS Directive 2011/65/EU and are suitable for environmentally regulated industrial and automotive manufacturing.
74LCX574WM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCX
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 150 MHz
- Max Propagation Delay @ V, Max CL:
- 8.5ns @ 3.3V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 3.6V
- Current - Quiescent (Iq):
- 10 µA
- Input Capacitance:
- 7 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
74LCX574WM FAQ
1.How can I place an order for 74LCX574WM through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCX574WM 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 74LCX574WM reliable?
The price and inventory of 74LCX574WM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX574WM is usually 5 days.
3.What payment methods are accepted for 74LCX574WM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX574WM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCX574WM?
74LCX574WM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCX574WM 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 74LCX574WM?
For technical support, including 74LCX574WM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX574WM requirements.
6.How does Aetrix verify that 74LCX574WM is sourced from the original manufacturer or authorized distributors?
All 74LCX574WM 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 74LCX574WM meets industry standards.
7.What is the process for return or replacement of 74LCX574WM?
All 74LCX574WM units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX574WM, 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 74LCX574WM part is unused and in its original packaging.
Return procedure for 74LCX574WM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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