SN74HC574N Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
Texas Instruments SN74HC574N is an octal edge-triggered D-type flip-flop with 3-state outputs and active-LOW output enable, operating from 2 V to 6 V at up to 50 pF load in a 20-pin DIP package for bus interfacing. Available from stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 20
- Lifecycle
- ACTIVE
- Datasheet
- SN74HC574N Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.2884(MOQ 500)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 8-bit edge-triggered D-type flip-flop with 3-state bus-drive outputs and active-LOW output enable for latching and driving 8-bit data buses in microprocessor and FPGA systems
- HC-family logic with 2 V to 6 V supply range and 50 pF load drive capability, providing propagation delay of approximately 13 ns at 5 V for high-speed register applications
- 20-pin PDIP through-hole broadside pinout (input pins on one side, output pins on the other) simplifying PCB signal routing compared to inline-pinout 74HC374
Applications
The SN74HC574N is widely used as an 8-bit output register or data latch in microprocessor bus interfaces, capturing parallel data on a clock edge and holding it on a 3-state bus under output enable control. It serves as a pipeline register between FPGA I/O banks and external memory or peripheral chips, buffering 8-bit address or data signals. The 20-pin DIP format also suits educational and prototype designs where breadboard-compatible through-hole registers are needed for logic and computer architecture labs.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Additional Feature | BROADSIDE VERSION OF 374 |
| Control Type | ENABLE LOW |
| Count Direction | UNIDIRECTIONAL |
| Family | HC/UH |
| JESD-30 Code | R-PDIP-T20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS DRIVER |
| Max Frequency@Nom-Sup | 24000000Hz |
| Max I(ol) | 0.0078A |
| Number of Bits | 8 |
| Number of Functions | 8 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP20,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Packing Method | TUBE |
| Power Supply Current-Max (ICC) | 0.08mA |
| Prop. Delay@Nom-Sup | 0.066ns |
| Propagation Delay (tpd) | 330ns |
| Qualification Status | Not Qualified |
| Screening Level | MIL-PRF-38535 |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 2V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Trigger Type | POSITIVE EDGE |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
| Country of Origin | Malaysia |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SN74HC574N:
Frequently Asked Questions
How does the SN74HC574N differ from the SN74HC374N in terms of pinout and PCB routing?
The SN74HC574N uses a broadside pinout where all 8 data inputs (D0–D7) are on one side of the 20-pin DIP and all 8 outputs (Q0–Q7) are on the opposite side, simplifying parallel bus routing between the input and output connectors. The 74HC374 uses an inline pinout with alternating input and output pins, which is less convenient for direct bus-to-bus PCB traces in 8-bit data path designs.
What clock edge triggers the SN74HC574N to latch its inputs and hold data on the bus?
The SN74HC574N latches the state of all 8 D inputs on the rising edge of the clock (CP) signal and holds those values at the Q outputs until the next rising edge. The active-LOW output enable (OE) then controls whether the stored data drives the 3-state bus outputs or places all 8 outputs in the high-impedance state, allowing multiple 74HC574 devices to share a common 8-bit bus at 2 V to 6 V supply.
What is the propagation delay and output drive of the SN74HC574N at 5 V for a bus interface design?
At a 5 V supply with 50 pF load, the SN74HC574N has a typical clock-to-output propagation delay of approximately 13 ns and output enable propagation delay of about 10 ns. Each 3-state output can sink or source up to 4 mA, sufficient for driving short PCB bus traces up to 10 cm in length when interfacing microcontrollers with external memory or I/O expanders at clock rates up to 25 MHz.
For a data acquisition system recording 8 sensor bits to a shared microcontroller bus, how does the SN74HC574N manage bus contention?
The SN74HC574N's 3-state outputs allow multiple data sources to share one 8-bit bus. The microcontroller asserts the active-LOW OE pin LOW to connect a specific SN74HC574N's latched 8 sensor bits to the bus, while all other SN74HC574N devices on the same bus have OE HIGH and their outputs float in the high-impedance state. This prevents bus contention and allows 8 or more independent 8-bit sensor registers to time-multiplex data onto the same 8-wire bus.
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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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