描述 Description

The SN74CB3Q16244 device is a high-bandwidth FET bus switch using a charge pump to elevate the gate voltage of the pass transistor, providing a low and flat ON-state resistance (ron). The low and flat ON-state resistance allows for minimal propagation delay and supports rail-to-rail switching on the data input/output (I/O) ports. The SN74CB3Q16244 device also features low data I/O capacitance to minimize capacitive loading and signal distortion on the data bus. Specifically designed to support high-bandwidth applications, the SN74CB3Q16244 device provides an optimized interface solution ideally suited for broadband communications, networking, and data-intensive computing systems.

The SN74CB3Q16244 device is organized as four 4-bit bus switches with separate output-enable (1OE, 2OE, 3OE, 4OE) inputs. It can be used as four 4-bit bus switches, two 8-bit bus switches, or one 16-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 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 circuitry prevents damaging current 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.

特性 Features

? High-Bandwidth Data Path (Up to 500 MHz)
? 5-V Tolerant I/Os With Device Powered Up or Powered Down
? Low and Flat ON-State Resistance (ron) Characteristics Over Operating Range (ron= 5 Ω Typical)
? Rail-to-Rail Switching on Data I/O Ports
? 0 to 5-V Switching With 3.3-V VCC
? 0 to 3.3-V Switching With 2.5-V VCC

? Bidirectional Data Flow With Near-Zero Propagation Delay
? Low Input and Output Capacitance Minimizes Loading and Signal Distortion (Cio(OFF) = 4 pF Typical)
? Fast Switching Frequency (fOE = 20 MHz Maximum)
? Data and Control Inputs Provide Undershoot Clamp Diodes
? Low Power Consumption (ICC = 1 mA Typical)
? 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 and 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