SN54ALS563A

Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7 V
Voltage applied to a disabled 3-state output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5.5 V
Operating free-air temperature range: SN54ALS563A . . . . . . . . . . . . . . . . . 55 to 125
                                                              SN74ALS563B . . . . . . . . . . . . . . . . . . . . .0 to 70
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65 to 150

These 8-bit latches SN54ALS563A feature three-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. SN54ALS563A is particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.

The eight latches of SN54ALS563A are transparent D-type latches. While the enable (C) is high the Q outputs will follow the complements of data (D) inputs. When the enable is taken low the output will be latched at the inverses of the levels that were set up at the D inputs.

A buffered output-control input of SN54ALS563A 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 of SN54ALS563A neither load nor drive the bus lines significantly. The high-impedance state and increased high-logic level provide the capability to drive the bus lines in a bus-organized system without need for interface or pull-up components.

The output of SN54ALS563A control (OC) does not affect the internal operation of the latches. Old data can be retained or new data can be entered while the outputs are in the high-impedance state.

The SN54ALS563A is characterized for operation over the full military temperature range of 55

to 125. The SN74ALS563B is characterized for operation from 0 to 70.