Bus Switch 2-Element CMOS 2-IN 8-Pin SOIC T/R

The SN74CBTD3305C is a high-speed TTL-compatible FET bus switch with low ON-state resistance (ron), allowing for minimal propagation delay. This device features an integrated diode in series with VCC to provide level shifting for 5-V input down to 3.3-V output levels. Active Undershoot-Protection Circuitry on the A and B ports of the SN74CBTD3305C 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 SN74CBTD3305C 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 connected to the B port, allowing bidirectional data flow between ports. When OE is low, the associated 1-bit bus switch is OFF, and a 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. To ensure the high-impedance state during power up or power down, OE should be tied to GND through a pulldown resistor; the minimum value of the resistor is determined by the current-sourcing capability of the driver. 

Undershoot Protection for Off-Isolation on A and B Ports Up To –2 V

Integrated Diode to V_CC Provides 5-V Input Down To 3.3-V Output Level Shift

Bidirectional Data Flow, With Near-Zero Propagation Delay

Low ON-State Resistance (r_on) Characteristics (r_on = 3 O Typical)

Low Input/Output Capacitance Minimizes Loading and Signal Distortion (C_io(OFF) = 5 pF Typical)

Data and Control Inputs Provide Undershoot Clamp Diodes

V_CC Operating Range From 4.5 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

I_off Supports Partial-Power-Down Mode Operation

Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II

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, Memory Interleaving, Bus Isolation, Low-Distortion Signal Gating