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

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Other qualified versions of SN74AC574

Version Part Number Definition
Military SN54AC574 QML certified for Military and Defense Applications
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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)
Input Type
Output Type
3-State Output
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
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    
CMOS     CMOS    
CMOS     CMOS    
Yes     Yes    
Catalog     Military    
-40 to 85     -55 to 125    
20PDIP
20SOIC
20SSOP
20TSSOP    
20CDIP
20CFP
20LCCC    
0.26 | 1ku