3-State Buffer-Type Outputs Drive Bus
Lines Directly
Bus-Structured Pinout
Provides Extra Bus-Driving Latches
Necessary for Wider Address/Data Paths or
Buses With Parity
Buffered Control Inputs to Reduce
dc Loading Effects
Power-Up High-Impedance State
Package Options Include Plastic
Small-Outline (DW) Packages and Standard
Plastic (NT) 300-mil DIPs

description
This 9-bit bus-interface D-type latch features
3-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 latches with noninverting data (D) inputs.
A buffered output-enable (OE) input places the nine 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
interface or pullup components.
OE does not affect the internal operation of the latches. Previously stored data can be retained or new data can
be entered while the outputs are off.
The SN74ALS843 is characterized for operation from 0°C to 70°C.