CD74AC574MG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The CD74AC574MG4 is an octal non-inverting D-type flip-flop bus driver in the AC CMOS logic family, featuring 8 independent D flip-flops with three-state outputs in a 20-pin SOIC package. It captures and holds 8 bits of data on the rising clock edge with 50 pF load drive capability. Available from stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- CD74AC574MG4 Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.4746(MOQ 800)
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of CD74AC574MG4?
- 8 independent non-inverting D-type flip-flops in a single 20-pin SOIC package latch 8-bit data words synchronously on the rising clock edge
- AC CMOS family provides 24 mA output drive current with propagation delays under 10 ns, suitable for fast bus-buffering at up to 50 MHz
- Three-state outputs allow multiple CD74AC574MG4 devices to share a common bus without bus contention when output-enable is deasserted
- Broadside (straight-through) pin arrangement of the '574 variant simplifies PCB routing compared with the pinout of the '374 variant
What is CD74AC574MG4 used for?
The CD74AC574MG4 is used as a pipeline register and data latch in digital systems where 8-bit data must be captured synchronously and held stable for downstream processing, such as address latches and data pipelines in microprocessor memory interfaces. Its three-state outputs and 20-pin SOIC package make it a standard choice for data bus expansion in embedded controllers, DSP boards, and FPGA prototype systems where multiple register stages share a common output bus. High-speed AC CMOS switching also makes it appropriate for glitch-free registered outputs in industrial programmable logic controllers operating at clock rates up to 50 MHz.
What are the specifications of CD74AC574MG4?
| Pbfree Code | Yes |
| YTEOL | 0 |
| Additional Feature | BROADSIDE VERSION OF 374 |
| Control Type | INDEPENDENT CONTROL |
| Count Direction | UNIDIRECTIONAL |
| Family | AC |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS DRIVER |
| Max Frequency@Nom-Sup | 89000000Hz |
| Number of Bits | 8 |
| Number of Functions | 1 |
| Number of Ports | 2 |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP20,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 0.16mA |
| Prop. Delay@Nom-Sup | 15.1ns |
| Propagation Delay (tpd) | 135ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 1.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | MILITARY |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Trigger Type | POSITIVE EDGE |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Malaysia |
Where can I find the CD74AC574MG4 datasheet?
CD74AC574MG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for CD74AC574MG4?
Compatible alternatives and drop-in replacements for CD74AC574MG4:
Frequently Asked Questions
How many flip-flop bits does the CD74AC574MG4 contain and how are they triggered?
The CD74AC574MG4 contains 8 D-type flip-flops, all clocked simultaneously by a common rising-edge clock input. On each rising edge of the clock, the logic levels present at the 8 D inputs are transferred to and held at the 8 Q outputs until the next rising clock edge. This synchronous 8-bit capture makes the device suitable for pipelining data bytes in processor buses operating at clock frequencies up to 50 MHz.
What is the difference between the CD74AC574 and the CD74AC374, and which layout situation favours each?
The '574 variant uses a broadside (straight-through) pin arrangement where D inputs and Q outputs appear on opposite sides of the 20-pin package, simplifying bus routing when input and output traces run on parallel layers. The '374 variant has a pinout optimised for driving a bus on one side while reading data from the other side of the board edge. For most modern PCB auto-routing tools, the straight-through '574 pinout reduces via count by 30 to 50 % in a typical 8-bit bus layout.
Can multiple CD74AC574MG4 devices share a single output bus without bus contention?
Yes. Each of the 8 Q outputs is three-state controlled by a common active-low output-enable pin. When OE is deasserted high, all 8 outputs enter a high-impedance state, allowing another device on the same bus to drive the lines. Bus arbitration logic can time-multiplex up to 8 separate CD74AC574MG4 registers onto a shared 8-bit bus by sequentially asserting each device's OE pin for 5 ns minimum before switching to the next device.
What load capacitance can the CD74AC574MG4 drive, and how does that compare with standard CMOS families?
The device is characterised with a 50 pF load capacitance per output, which covers a typical PCB trace with 3 to 5 downstream CMOS inputs in a standard FR4 layout. The AC CMOS family's 24 mA output drive current charges a 50 pF load to a valid logic level within about 2 ns, approximately 3 to 4 times faster than the HC family at the same capacitance, making it the preferred choice in systems where propagation delay budgets are tight.
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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.
More from Texas Instruments
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 800+ | $0.4746 | $379.67 |
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