SN74CBT3244C

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 Ω Typical)
* Low Input/Output Capacitance Minimizes
    Loading and Signal Distortion
    (Cio(OFF) = 5.5 pF Typical)
*  Data and Control Inputs Provide
    Undershoot Clamp Diodes
*  Low Power Consumption
    (ICC = 3 µA 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, 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


Pinout




Specifications

Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . .  . . . . .  −0.5 V to 7 V
Control input voltage range, VIN (see Notes 1 and 2) . . . . . . . . . . . . .  −0.5 V to 7 V
Switch I/O voltage range, VI/O (see Notes 1, 2, and 3)  . . . . . . . . . . .   −0.5 V to 7 V
Control input clamp current, IIK (VIN < 0)   . . . . . . . . . . . . . . . . . . . . .. . . . . . −50 mA
I/O port clamp current, II/OK (VI/O < 0)   . . . . . . . . . . . . . . . . . . . . . . . . . . . . −50 mA
ON-state switch current, II/O (see Note 4)  . . . . . . . . . . . . . . . . . . . . . . . . . ±128 mA
Continuous current through VCC or GND terminals   . . . . . . . . . . . . . . . . . .. ±100 mA
Package thermal impedance, JA (see Note 5): DB package. . . . . . . . . . .. .   70°C/W
(see Note 5): DBQ package  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... . . ..  . .68°C/W
(see Note 5): DGV package  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . 92°C/W
(see Note 5): DW package   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  . . .  . ..58°C/W
(see Note 5): PW package   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83°C/W
(see Note 6): RGY package   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  . . . .  .. .37°C/W
Storage temperature range, Tstg  . . . . . . . . . . . . . . . . . . . . . . .  . .−65°C to 150°C


Description

The SN74CBT3244C 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 SN74CBT3244C 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 SN74CBT3244C is organized as two 4-bit bus switches with separate output-enable (1OE, 2OE) inputs. It can be used as two 4-bit bus switches or as one 8-bit bus switch. When OE is low, the associated 4-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 4-bit bus switch is OFF, and the high-impedance state exists between the A and B
ports.