The SN74CB3T3125 is a high-speed TTL-compatible FET bus switch with low ON-state
resistance (ron), allowing for minimal propagation delay. The device fully
supports mixed-mode signal operation on all data I/O ports by providing voltage translation that
tracks VCC. The SN74CB3T3125 supports systems using 5-V TTL, 3.3-V LVTTL,
and 2.5-V CMOS switching standards, as well as user-defined switching levels (see
Typical DC Voltage-Translation Characteristics).The SN74CB3T3125 is organized as four 1-bit bus switches with separate output-enable
(1OE, 2OE, 3OE,
4OE) inputs. It can be used as four 1-bit bus switches or as one 4-bit bus
switch. When OE is low, the associated 1-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 1-bit bus switch is OFF, and the high-impedance
state exists between the A and B ports.This device is fully specified for partial-power-down applications using
Ioff. The Ioff feature ensures that damaging current
will not backflow through the device when it is powered down. The device has isolation during power
off.To ensure the high-impedance state during power up or power down,
OE should be tied to VCC through a pullup resistor;
the minimum value of the resistor is determined by the current-sinking capability of the
driver.
