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.