SN74HC574APW Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
SN74HC574APW is an octal edge-triggered D-type flip-flop from Texas Instruments with 3-state outputs, HC CMOS logic family operating from 2 V to 6 V supply, 20-pin TSSOP packaging, and rising-edge clock capture for 8-bit data latching and bus interfacing applications.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- ACTIVE
- Datasheet
- SN74HC574APW Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 8 edge-triggered D-type flip-flops with common clock and output-enable control
- 3-state outputs for direct data bus connection without additional buffers
- HC CMOS logic family: VCC range 2 V to 6 V for broad system compatibility
- Rising-edge clock capture for deterministic 8-bit data storage
- 20-pin TSSOP (APW) package for compact SMT layouts
- High output drive capability for bus driving at 2 V to 6 V
- Compatible with TTL and CMOS input levels
Applications
The SN74HC574APW is used as an 8-bit data latch and registered output port in microprocessor, microcontroller, and FPGA interface designs requiring temporary storage of parallel bus data. It is commonly deployed for address demultiplexing, I/O port expansion, and pipeline staging in embedded systems and digital control boards. The device is also used in LED display drivers and relay output cards where a registered 8-bit output with tri-state control is needed.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SN74HC574APW:
Frequently Asked Questions
On which clock edge does the SN74HC574APW capture input data, and why does that matter for bus timing?
The SN74HC574APW captures D-input data on the rising edge of the clock, transferring all 8 bits simultaneously to the Q outputs, which simplifies timing closure in synchronous bus designs operating at frequencies up to 25 MHz with a 5 V supply.
How do the 3-state outputs of the SN74HC574APW enable multiple devices to share a data bus?
The active-low output-enable pin (OE) places all 8 Q outputs in high-impedance state when deasserted, allowing several SN74HC574APW devices to connect their outputs directly to a shared 8-bit bus with no bus contention when only one device is enabled at a time.
What supply voltage range does the SN74HC574APW support, and can it interface directly with 3.3 V logic?
The SN74HC574APW operates from 2 V to 6 V VCC, and at 3.3 V supply it accepts TTL-level inputs and drives standard CMOS output levels, allowing direct interfacing with 3.3 V microcontrollers and FPGAs without additional level-shifting components.
For compact PCB designs, how does the SN74HC574APW's 20-pin TSSOP package compare to SOIC alternatives?
The 20-pin TSSOP (APW) package has a body width of 4.4 mm and 0.65 mm pin pitch, which is roughly 40% narrower than an equivalent SOIC-20 package, making it the preferred choice for densely populated PCBs in handheld instruments and embedded controller boards.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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