SN74ACT374 Octal D-Type Edge-Triggered Flip-Flops With 3-State Outputs |


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

Octal D-Type Edge-Triggered Flip-Flops With 3-State Outputs - SN74ACT374


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 ’ACT374 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 bus-organized systems 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.


  • 4.5-V to 5.5-V VCC Operation
  • Inputs Accept Voltages to 5.5 V
  • Max tpd of 10 ns at 5 V
  • Inputs Are TTL-Voltage Compatible

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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)
IOL (Max) (mA)
IOH (Max) (mA)
3-state output
Operating temperature range (C)
SN74ACT374 SN54ACT374
ACT     ACT    
4.5     4.5    
5.5     5.5    
8     8    
5     5    
90     90    
0.04     0.04    
11.5     11.5    
24     24    
-24     -24    
Yes     Yes    
Catalog     Military    
-40 to 85     -55 to 125