SN74CB3T3384

10BIT FET BUS SWITCH

2.5V/3.3V LOW VOLTAGE BUS SWITCH WITH 5V TOLERANT LEVEL SHIFTER

SCDS159B − OCTOBER 2003 − REVISED MARCH 2004

2

POST OFFICE BOX 655303

description/ordering information (continued)

allowing for minimal propagation delay. The device fully supports mixed-mode signal operation on all data I/O

3.3-V LVTTL, and 2.5-V CMOS switching standards, as well as user-defined switching levels (see Figure 1).

VCC

≈VCC

5.5 V

0 V

NOTE A: If the input high voltage (VIH) level is greater than or equal to VCC − 1 V, and less than or equal to 5.5 V, the output high

voltage (VOH) level will be equal to approximately the VCC voltage level.

Input Voltages

Output Voltages

0 V

≈VCC − 1 V

≈VCC − 1 V

VCC

IN

OUT

CB3T

Figure 1. Typical DC-Voltage-Translation Characteristics

The SN74CB3T3384 is organized as two 5-bit bus switches with separate ouput-enable (1OE, 2OE) inputs. It

can be used as two 5-bit bus switches or as one 10-bit bus switch. When OE is low, the associated 5-bit bus

switch is ON, and the A port is connected to the B port, allowing bidirectional data flow between ports. When

OE is high, the associated 5-bit bus switch is OFF, and a high-impedance state exists between the A and B ports.

damaging current will not backflow through the device when it is powered down. The device has isolation during

power off.

resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

FUNCTION TABLE

(each 5-bit bus switch)

INPUT

INPUT/OUTPUT

FUNCTION

INPUT

OE

INPUT/OUTPUT

A

FUNCTION

L

B

A port = B port

H

Z

Disconnect