MM74HC573WMX - 3-STATE Octal D-Type Latch | onsemi
MPN: MM74HC573WMX ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.976 | $0.98 |
| 10 | $0.8 | $8.00 |
| 100 | $0.65 | $65.00 |
| 500 | $0.55 | $275.00 |
| 1,000 | $0.4873 | $487.30 |
MM74HC573WMX Overview
An octal D-type latch is a level-sensitive storage element: while its enable input is active, the Q outputs follow the corresponding D inputs; when the enable is inactive, the last presented data level is retained. The 3-STATE output control allows each output to be driven, placed in a high-impedance state, or otherwise controlled for shared-bus use. The MM74HC573WMX therefore belongs to the broader CMOS logic family, specifically latches and bus-interface logic.
Key features include low power consumption, high noise immunity, and output-drive capability for 15 LS-TTL loads. The transparent architecture supports data transfer when the latch-enable timing is controlled externally. The output-enable function is useful for preventing multiple devices from driving a shared data bus during multiplexing or address-latch applications. Exact propagation-delay, supply-voltage, and current limits should be confirmed against the manufacturer datasheet for the selected operating conditions.
The MM74HC573WMX is commonly used where an eight-bit parallel data path must be temporarily latched or isolated. Typical implementations include address or data-bus buffering, microprocessor and microcontroller interface logic, temporary data storage between parallel buses, and general-purpose digital control systems. The 20-pin SOIC package supports conventional surface-mount PCB assembly, while the latch and output-enable signals provide sequencing control.
When designing around this device, treat enable and output-enable timing as part of the system interface. Ensure that bus contention is prevented during output-disable transitions, account for load capacitance when timing is critical, and use pull-up or pull-down arrangements where required by the surrounding bus architecture. The manufacturer datasheet and device-specific timing tables are the authoritative references for final design decisions.
This product page combines verified source information, package and functional context, comparison criteria, and practical design guidance. It is intended to help engineers identify suitable applications and confirm whether the MM74HC573WMX is appropriate for a particular bus-interface or logic design.
Drop-in alternatives for MM74HC573WMX — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
SN74HC573ADW
✅ Drop-In📋 Reference alternative (not in catalog)
MM74HC573WMX Maximum Ratings & Electrical Characteristics
| Product Type | 3-STATE octal D-type latch |
| Technology | Silicon-gate P-well CMOS |
| Number of Channels | 8 |
| Input Type | D-type data inputs |
| Output Type | 3-STATE non-inverting outputs |
| Latch Function | Transparent D-type latch |
| Package | 20-pin SOIC |
| Mounting Type | Surface mount |
| Output Drive Capability | 15 LS-TTL loads |
| Noise Immunity | High noise immunity |
| Power Consumption | Low power consumption |
| Output Control | 3-STATE output enable |
| Supplier Price | $0.4873 from LCSC |
MM74HC573WMX 20-pin soic Pin Configuration Guide
Pin configuration for MM74HC573WMX (20-pin soic package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for MM74HC573WMX.
Refer to the datasheet for full pin configuration.
Typical Applications
MM74HC573WMX is suitable for 6 applications: Address Latch for Parallel Buses, Microcontroller Parallel Data Buffering, Shared Multiplexed Data Bus, Eight-Bit Temporary Data Storage, General-Purpose Digital Control Logic, Peripheral Interface and Data Isolation.
Address Latch for Parallel Buses
The MM74HC573WMX is suited to address-latch applications where eight address lines must be presented to a memory or peripheral during one phase of a bus cycle. Its transparent D inputs allow the latch-enable signal to determine when address data passes through, while the 3-STATE output control can keep the device from driving a shared bus when required. The manufacturer describes the device as a high-speed octal D-type latch with the ability to drive 15 LS-TTL loads. Exact setup and hold timing must be checked in the manufacturer datasheet against the memory or peripheral being interfaced.
Recommended
Microcontroller Parallel Data Buffering
The MM74HC573WMX can buffer eight parallel signals between a microcontroller or processor and a peripheral bus, helping isolate the source during bus handshakes. Latch enable controls transparent data transfer, and output enable provides high-impedance control when another peripheral owns the bus. Its CMOS implementation offers low power consumption and high noise immunity, while the stated 15 LS-TTL-load drive capability supports interfacing with compatible logic. Confirm voltage compatibility, propagation delay, and output timing before using it between devices with different bus speeds.
Recommended
Shared Multiplexed Data Bus
Use the MM74HC573WMX in a multiplexed system where multiple logic blocks connect to one eight-bit data bus. Output enable can connect the latch only during the device's assigned bus interval, while latch enable captures or passes data during the required interval. This arrangement reduces contention when access timing is deterministic. The 3-STATE feature is central to the application: designers should verify that every competing driver is disabled before another device enables its outputs. The device's high noise immunity and CMOS power characteristics suit digital control systems, but exact timing remains application-specific.
Recommended
Eight-Bit Temporary Data Storage
The MM74HC573WMX can hold an eight-bit value temporarily when a downstream circuit needs stable data while another bus activity changes the source signals. With latch enable active, the outputs follow the inputs; after latch enable is deasserted, the stored state is retained. This makes the device useful in control, instrumentation, and digital interface assemblies that need a stable parallel value during a later processing phase. The 20-pin SOIC package supports conventional surface-mount assembly. Verify supply voltage and timing from the datasheet before defining the storage timing budget.
Recommended
General-Purpose Digital Control Logic
The MM74HC573WMX provides a practical parallel latch function in general digital control systems where multiple control or status signals must be grouped and selectively driven. Its high noise immunity is useful in electrically noisy industrial environments, while low power consumption helps limit system overhead. The 3-STATE outputs support flexible bus sharing and isolation. Because the supplied sources describe the core logic function but do not provide every electrical limit, engineers should use the manufacturer datasheet to establish operating voltage, input thresholds, output current, and timing requirements for the final control system.
Recommended
Peripheral Interface and Data Isolation
The MM74HC573WMX can isolate eight data lines while allowing a peripheral bus to be sampled or held during a control sequence. Latch enable defines when the data is transparent, and output enable determines when the outputs participate in the bus. This separation helps prevent unintended data propagation during bus turnaround or peripheral selection. The device's stated drive capability for 15 LS-TTL loads can simplify interfacing to compatible legacy logic, but modern designs should still check voltage levels, fanout, rise and fall behavior, and timing at the actual load. Use the official datasheet for final interface calculations.
Recommended
Recommended Products Summary
Engineering reference data for MM74HC573WMX — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SN74HC573ADW |
|---|---|---|
| Package | 20-pin SOIC | SOIC-20 |
| Brand | onsemi | Texas Instruments |
| Function | 3-STATE octal D-type latch | Octal transparent D latch with 3-state outputs |
| Number of Channels | 8 | 8 |
| Latch Control | Transparent latch operation | Transparent latch operation |
Key Differentiators
- Parallel octal latch with three-state bus control (vs SN74HC573ADW)
- Stated LS-TTL drive capability (vs SN74HC573ADW)
- onsemi source and 20-pin SOIC availability (vs SN74HC573ADW)
Design Notes
Do not enable two devices that drive the same bus node at the same time. Sequence output enable so all competing outputs enter the high-impedance state before the intended device begins driving. Latch enable and output enable are separate controls: deasserting output enable does not retain or replace the latch function. Check the complete bus truth table in the manufacturer datasheet.
Treat enable and disable transitions as timing events. Account for propagation delay, output transition time, load capacitance, and the receiving device's setup and hold requirements. For longer traces or higher-capacitance buses, verify rise and fall behavior from the datasheet and keep routing short enough to avoid violating the system's bus timing budget.
Place the MM74HC573WMX close to the bus-driver or receiving logic to minimize trace capacitance and improve control of enable-edge timing. Maintain a continuous ground reference, avoid long stubs, and place any required decoupling capacitors close to the device power pins according to the manufacturer layout guidance. Confirm the exact pinout from the official datasheet before fabrication.
Compliance Information
The supplied verified sources identify the function, package family, manufacturer, pricing, and sourcing information but do not explicitly provide RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. Compliance must be confirmed from current manufacturer documentation before use in regulated designs.
