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MC74AC574DW

Name: MC74AC574DW
Rating: 4.7 (12 reviews)

IC FF D-TYPE SNGL 8BIT 20SOIC

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規格

Supplier	Rochester Electronics, LLC,onsemi
Package	Tube,Tube
Series	74AC
ProductStatus	Obsolete
Function	Standard
Type	D-Type
OutputType	Tri-State, Non-Inverted
NumberofElements	1
NumberofBitsperElement	8
ClockFrequency	95 MHz
MaxPropagationDelay@VMaxCL	9.5ns @ 5V, 50pF
TriggerType	Positive Edge
Current-OutputHighLow	24mA, 24mA
Voltage-Supply	2V ~ 6V
Current-Quiescent(Iq)	8 µA
InputCapacitance	4.5 pF
OperatingTemperature	-40°C ~ 85°C (TA)
MountingType	Surface Mount
SupplierDevicePackage	20-SOIC

概述

Description

The MC74AC574DW is an 8-bit, edge-triggered D-type register with tri-state outputs in the 74AC CMOS family. It has eight data inputs (D0–D7), eight outputs (Q0–Q7), a clock input (CP) that captures data on the rising edge, and an output-enable input (OE) that tri-states all outputs when de-asserted. This makes it ideal for buffering and storing 8-bit data on a common bus or between a microcontroller and peripherals.
Key points:
- 8-bit register with 3-state outputs
- Rising-edge clock; data stored on CP transition
- OE controls bus enable/tri-state
- Vcc typically 5 V, range about 2–6 V (CMOS)
- Fast CMOS performance (ns-scale propagation at rated Vcc)
- Package: 20-pin DW variants (SOP/DIP formats)
Common uses: data buffering, register files, bus interfacing, and temporary data storage in digital systems.

Features

Here are the key features of MC74AC574DW:
- Octal D-type register: 8-bit storage with D0–D7 inputs and Q0–Q7 outputs
- Edge-triggered: data captured on the rising edge of the clock (CP)
- Output Enable: OE input (active-low) to enable/tri-state the outputs
- 3-state outputs: allows bus sharing when OE is asserted
- Supply voltage: 2.0 V to 6.0 V CMOS operation (AC family)
- Fast CMOS performance: low propagation delay (tpd typically in the ~8–12 ns range at 5 V)
- Low power consumption (typical CMOS efficiency)
- Suitable for buffering/storage and data-path buffering
- 20-pin DW package (e.g., SOIC) with standard interfacing
Note: Ensure OE is correctly driven to avoid bus contention.

Package

20-pin wide SOIC (DW) package.

Pinout

- Pin count: 20 pins (D0–D7, Q0–Q7, CLK, OE, Vcc, GND, etc.)
- Function: Octal D-type edge-triggered register with 3-state outputs. Eight D inputs are sampled on the rising edge of CLK and appear on the eight Q outputs; an output-enable input tri-states the outputs when disabled.

Manufacturer

Manufacturer: ON Semiconductor (ON Semiconductor Corporation). It is an American multinational semiconductor company that designs, manufactures, and markets integrated circuits and discrete components for automotive, industrial, computing, and consumer electronics markets.

Application

MC74AC574DW is an 8-bit D-type register with 3-state outputs. Applications:
- Buffering and latching 8-bit data on fast-to-slow buses
- Demultiplexing address/data on multiplexed microprocessor buses
- Temporary storage in pipelines and state machines
- I/O expansion and bus sharing with tri-state outputs

Equivalent

Equivalent parts (octal D-type register with 3-state outputs):
- 74AC574 (and SN74AC574)
- 74ACT574
- 74HC574
- 74HCT574
DW suffix refers to TI’s packaging (e.g., SN74AC574DW). All are functionally the same device in different CMOS families and packages.