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 Effects
Power-Up High-Impedance State
Package Options Include Plastic
Small-Outline (DW) Packages and Standard
Plastic (NT) 300-mil DIPs

description
These 10-bit latches feature 3-state outputs
designed specifically for driving highly capacitive
or relatively low-impedance loads. They are
particularly suitable for implementing buffer
registers, I/O ports, bidirectional bus drivers, and
working registers.
The ten latches are transparent D-type latches.
The SN74ALS841 and SN74AS841A have
noninverting data (D) inputs. The SN74ALS842
has inverting D inputs.
A buffered output-enable (OE) input places the ten
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 SN74ALS841, SN74AS841A, and SN74ALS842 are characterized for operation from 0°C to 70°C.