SN54AC374 Octal D-Type Edge-Triggered Flip-Flops with 3-State Outputs | TI.com

SN54AC374 (ACTIVE) Octal D-Type Edge-Triggered Flip-Flops with 3-State Outputs

Octal D-Type Edge-Triggered Flip-Flops with 3-State Outputs - SN54AC374
Datasheet
 

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 ’AC374 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.

Features

  • 2-V to 6-V VCC Operation
  • Inputs Accept Voltages to 6 V
  • Max tpd of 9.5 ns at 5 V
  • 3-State Noninverting Outputs Drive Bus Lines Directly
  • Full Parallel Access for Loading

Parametrics

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Part number Order 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 Rating Operating temperature range (C)
SN54AC374 Order now AC     2     6     8     3.3
5    
100     0.04     14
10.5    
24     -24     Yes     Military     -55 to 125    
SN74AC374 Order now AC     2     6     8     3.3
5    
100     0.04     15.5
10.5    
24     -24     Yes     Catalog     -40 to 85