SN54ACT534, SN74ACT534
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH 3-STATE OUTPUTS

SCAS556A - NOVEMBER 1995 - REVISED MAY 1996

features

• Inputs Are TTL-Voltage Compatible
• 3-State Inverting Outputs Drive Bus Lines Directly
• Full Parallel Access for Loading
• EPIC ^TM (Enhanced-Performance Implanted CMOS) 1-m Process
• Package Options Include Plastic Small-Outline (DW), Shrink Small-Outline (DB), Thin Shrink Small-Outline (PW), Ceramic Chip Carriers (FK) and
  Flatpacks (W), and Standard Plastic (N) and Ceramic (J) DIPs

  EPIC is a trademark of Texas Instruments Incorporated.

description

These octal edge-triggered D-type 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.

On the positive transition of the clock (CLK) input, the Q\ outputs are set to the complements of the logic levels set up at the data (D) inputs.

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

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

The SN54ACT534 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ACT534 is characterized for operation from -40°C to 85°C.