SN74CBTH3383
10-BIT BUS-EXCHANGE SWITCH
WITH BUS HOLD

SCDS023E - MAY 1995 - REVISED AUGUST 1996

features

• Functionally Equivalent to QS3388
• 5- Switch Connection Between Two Ports
• TTL-Compatible Input and Output Levels
• Bus Hold on Data Inputs Eliminates the Need for External Pullup/Pulldown Resistors
• Package Options Include Plastic Small-Outline (DW), Shrink Small-Outline (DB), and Thin Shrink Small-Outline (PW) Packages

   

description

The SN74CBTH3383 provides ten bits of high-speed TTL-compatible bus switching or exchanging with bus hold on all I/Os. The low on-state resistance of the switch allows connection to be made with minimal propagation delay. When the switch is turned off, the bus-hold circuit pulls all I/Os to V_CC or to GND, depending on the last-known state of the pin. The bus-hold feature holds unused buses in a known TTL state, away from threshold. The bus-hold circuit can hold the bus in the last-known state as long as its leakage does not exceed 100 uA. If the leakage on the bus exceeds this value, the bus hold switches states. The bus-hold feature is active only when the SN74CBTH3383 I/Os are in the high-impedance state.

The device operates as a 10-bit bus switch or a 5-bit bus exchanger, which provides swapping of the A and B pairs of signals. The bus-exchange function is selected when is low. The switches are open when is high. Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level.

The SN74CBTH3383 is available in TI's shrink small-outline (DB) and thin shrink small-outline (PW) package, which provide the same I/O pin count and functionality of standard small-outline packages in less than half the printed-circuit-board area.

The SN74CBTH3383 is characterized for operation from -40°C to 85°C.