Octal D-Type Edge-Triggered Flip-Flops with 3-State Outputs - SN74AC574

SN74AC574 (ACTIVE)

Octal D-Type Edge-Triggered Flip-Flops with 3-State Outputs

 

Description

These 8-bit flip-flops feature 3-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. The devices are particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.

The eight flip-flops of the ’AC574 devices are D-type edge-triggered flip-flops. On the positive transition of the clock (CLK) input, the Q outputs are set to the logic levels set up at the data (D) inputs.

A buffered output-enable (OE)\ input can be used to place the eight outputs in either a normal logic state (high or low logic levels) or the high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines significantly. The high-impedance state and the increased drive provide the capability to drive bus lines in a bus-organized system without need for interface or pullup components.

OE\ does not affect internal operations of the flip-flop. Old data can be retained or new data can be entered while the outputs are in the high-impedance state.

To ensure the high-impedance state during power up or power down, OE\ should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

Features

  • 2-V to 6-V VCC Operation
  • Inputs Accept Voltages to 6 V
  • Max tpd of 8.5 ns at 5 V
  • 3-State Outputs Drive Bus Lines Directly

View more

Parametrics Compare all products in D-Type Flip-Flop

 
Technology Family
VCC (Min) (V)
VCC (Max) (V)
Bits (#)
Voltage (Nom) (V)
F @ Nom Voltage (Max) (Mhz)
ICC @ Nom Voltage (Max) (mA)
tpd @ Nom Voltage (Max) (ns)
Output Drive (IOL/IOH) (Max) (mA)
3-State Output
Rating
Operating Temperature Range (C)
Pin/Package
SN74AC574 SN54AC574
AC    AC   
2    2   
6    6   
8    8   
3.3
5   
3.3
5   
100    100   
0.04    0.04   
15
11   
15
11   
24/-24    24/-24   
Yes    Yes   
Catalog    Military   
-40 to 85    -55 to 125   
20PDIP
20SOIC
20TSSOP
20SSOP   
20CFP
20CDIP
20LCCC   

Other qualified versions of SN74AC574

Version Part Number Definition
Military SN54AC574 QML certified for Military and Defense Applications