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

The SN74CB3T3306 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 SN74CB3T3306 supports systems using 5-V TTL, 3.3-V LVTTL, and 2.5-V CMOS switching standards, as well as user-defined switching levels.The SN74CB3T3306 is organized as two 1-bit bus switches with separate ouput-enable (1OE, 2OE) inputs. It can be used as two 1-bit bus switches or as one 2-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 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. 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.

Output Voltage Translation Tracks V_CC

Supports Mixed-Mode Signal Operation
on All Data I/O Ports

• 5-V Input Down to 3.3-V Output Level
  Shift With 3.3-V V_CC
• 5-V/3.3-V Input Down to 2.5-V Output
  Level Shift With 2.5-V V_CC

5-V Tolerant I/Os With Device Powered Up
or Powered Down

Bidirectional Data Flow With Near-Zero
Propagation Delay

Low ON-State Resistance (r_on)
Characteristics (r_on = 5 O Typ)

Low Input/Output Capacitance Minimizes
Loading (C_io(OFF) = 4.5 pF Typ)

Data and Control Inputs Provide
Undershoot Clamp Diodes

Low Power Consumption
(I_CC = 20 µA Max)

V_CC Operating Range From 2.3 V to 3.6 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 250 mA Per
JESD 17

ESD Performance Tested Per JESD 22

• 2000-V Human-Body Model
  (A114-B, Class II)
• 1000-V Charged-Device Model (C101)

Supports Digital Applications: Level
Translation, USB Interface, Bus Isolation

Ideal for Low-Power Portable Equipment