FEATURES
· Undershoot Protection for OFF Isolation on A
and B Ports up to –2 V
· Bidirectional Data Flow With Near-Zero
Propagation Delay
· Low ON-State Resistance (ron) Characteristics
(ron = 3 W Typ)
· Low Input/Output Capacitance Minimizes
Loading and Signal Distortion
(Cio(OFF) = 5 pF Typ)
· Data and Control Inputs Provide Undershoot
Clamp Diodes
· Low Power Consumption
(ICC = 3 mA Max)
· VCC Operating Range From 4 V to 5.5 V
· Data I/Os Support 0- to 5-V Signaling Levels
(0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, 5 V)
· Control Inputs Can Be Driven by TTL or
5-V/3.3-V CMOS Outputs
· Ioff Supports Partial-Power-Down Mode
Operation
· Latch-Up Performance Exceeds 100 mA Per
JESD 78, ClassII
· ESD Performance Tested Per JESD 22
– 2000-V Human-Body Model
(A114-B, Class II)
– 1000-V Charged-Device Model (C101)
· Supports Both Digital and Analog
Applications: USB Interface, Bus Isolation,
Low-Distortion Signal Gating

DESCRIPTION/ORDERING INFORMATION
The SN74CBT3305C is a high-speed TTL-compatible FET bus switch with low ON-state resistance (ron), allowing
for minimal propagation delay. Active undershoot-protection circuitry on the A and B ports of the device provides
protection for undershoot up to –2 V by sensing an undershoot event and ensuring that the switch remains in the
proper OFF state.
The SN74CBT3305C is organized as two 1-bit bus switches with separate output-enable (1OE, 2OE) inputs. It
can be used as two 1-bit bus switches or as one 2-bit bus switch. When OE is high, the associated 1-bit bus
switch is ON, and the A port is conncected to the B port, allowing bidirectional data flow between ports. When
OE is low, the associated 1-bit bus switch is OFF, and the high-impedance state exists between the A and B
ports.