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 ).
●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.
● Output Voltage Translation Tracks VCC
● 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
●VCC
● 5-V/3.3-V Input Down to 2.5-V Output-Level Shift With 2.5-V VCC
● 5-V-Tolerant I/Os With Device Powered Up or Powered Down
● Bidirectional Data Flow, With Near-Zero Propagation Delay
● Low ON-State Resistance (ron) Characteristics
●ron = 5 Ω Typ)
● Low Input/Output Capacitance Minimizes Loading (Cio(OFF) = 4.5 pF Typ)
● Data and Control Inputs Provide Undershoot Clamp Diodes
● Low Power Consumption (ICC = 20 µA Max)
● VCC 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
● Ioff 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
