SN74LVC374A
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOP
WITH 3-STATE OUTPUTS

SCAS296F – JANUARY 1993 – REVISED JUNE 1997

• EPIC^TM (Enhanced-Performance Implanted CMOS) Submicron Process
• Typical V _OLP (Output Ground Bounce) < 0.8 V at V _CC = 3.3 V, T A = 25°C
• Typical V _OHV (Output V _OH Undershoot) > 2 V at V _CC = 3.3 V, T A = 25°C
• Power Off Disables Inputs/Outputs, Permitting Live Insertion
• Supports Mixed-Mode Signal Operation on All Ports (5-V Input/Output Voltage With 3.3-V V _CC )
• ESD Protection Exceeds 2000 V Per MIL-STD-883, Method 3015; Exceeds 200 V Using Machine Model (C = 200 pF, R = 0)
• Latch-Up Performance Exceeds 250 mA Per JESD 17
• Package Options Include Plastic Small-Outline (DW), Shrink Small-Outline (DB), and Thin Shrink Small-Outline (PW) Packages

description

This octal edge-triggered D-type flip-flop is designed for 2.7-V to 3.6-V V _CC operation.

The SN74LVC374A features 3-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. It is particularly suitable for implementing buffer registers, input/output (I/O) ports, bidirectional bus drivers, and working registers.

On the positive transition of the clock (CLK) input, the Q outputs are set to the logic levels at the data (D) inputs.

A buffered output-enable () input 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 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.

does not affect internal operations of the latch. Old data can be retained or new data can be entered while the outputs are in the high-impedance state.

Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices as translators in a mixed 3.3-V/5-V system environment.

To ensure the high-impedance state during power up or power down, should be tied to V _CC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

The SN74LVC374A is characterized for operation from –40°C to 85°C.