These octal edge-triggered D-type flip-flops feature 3-state outputs designed specifically for bus driving. The HCT574 devices are particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.
The eight flip-flops enter data on the low-to-high transition of the clock (CLK) input.
A buffered output-enable (OE)\ input can be used to place the eight outputs in either a normal logic state (high or low logic levels) or the 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 operations of the flip-flops. Old data can be retained or new data can be entered while the outputs are in the high-impedance state.
|Part number||Order||Technology Family||Input type||Output type||VCC (Min) (V)||VCC (Max) (V)||Channels (#)||Clock Frequency (Max) (MHz)||ICC (uA)||IOL (Max) (mA)||IOH (Max) (mA)||Features||Rating||Package Group|
High speed (tpd 10-50ns)
Positive input clamp diode
PDIP | 20
SOIC | 20
SO | 20
SSOP | 20
TSSOP | 20