SN54BCT374, SN74BCT374
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH 3-STATE OUTPUTS

SCBS019B - SEPTEMBER 1988 - REVISED APRIL 1994

features

• State-of-the-Art BiCMOS Design Significantly Reduces I_CC
• Full Parallel Access for Loading
• Buffered Control Inputs
• 3-State True Outputs Drive Bus Lines or Buffer Memory Address Registers
• ESD Protection Exceeds 2000 V Per MIL-Std-883C, Method 3015
• Package Options Include Plastic Small-Outline (DW) and Shrink Small-Outline (DB) Packages, Ceramic Chip Carriers (FK) and Flatpacks (W), and Standard Plastic and Ceramic 300-mil DIPs (J, N)

description

These 8-bit flip-flops 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 eight flip-flops of the ´BCT374 are edge-triggered D-type flip-flops. On the positive transition of the clock (CLK) input, the Q outputs are set to the logic levels that were set up 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) 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 the increased drive provide the capability to drive bus lines without need for interface or pullup components. The output-enable () input does not affect internal operations of the flip-flop. Old data can be retained or new data can be entered while the outputs are in the high-impedance state.

The SN54BCT374 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74BCT374 is characterized for operation from 0°C to 70°C.