SN74AS1843
9BIT BUS INTERFACE DTYPE LATCHES
WITH 3STATE OUTPUTS

features

• Center V_CC and GND Configuration Provides Minimum Lead Inductance in High Current Switching Applications
• 3-State Buffer-Type Outputs Drive Bus-Lines Directly
• Bus-Structured Pinout
• Provide Extra Bus Driving Latches Necessary for Wider Address/Data Paths or Buses With Parity
• Buffered Control Inputs to Reduce DC Loading
• Power-Up High Impedance
• Package Options Include Plastic DIPs. Use the ´AS843 for Plastic and Ceramic Chip Carriers and "Small Outline" Package Options
• Dependable Texas Instruments Quality and Reliability

description

This 9-bit latch device features three-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. It is particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.

The nine latches are transparent D-type and have noninverting data (D) inputs.

A buffered output control () input can be used to place the nine outputs in either a normal logic state (high or low 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 the bus lines in a bus-organized system without need for interface or pullup components.

The output control () does not affect the internal operation of the flip-flops. Old data can be retained or new data can be entered while the outputs are off.

The SN74AS1843 is characterized for operation from 0°C to 70°C.