9.1 Overview

The SN74CB3Q16244 is part of the CB3Q family of switches. The SN74CB3Q16244 is a 16-bit FET bus switch in which 4 Output Enable pins each control a set of 4 switches totaling 16 switches.

Figure 3. Simplified Schematic, Each FET Switch (SW)

9.2 Functional Block Diagram

9.3 Feature Description

The SN74CB3Q16244 device has a high-bandwidth data path (up to 500 MHz) and has 5-V tolerant I/Os with the device powered up or powered down. It also has low and flat ON-state resistance (r_on) characteristics over operating range (r_on = 5 Ω Typical)

This device also has rail-to-rail switching on data I/O ports for 0 to 5-V switching with 3.3-V V_CC and 0 to 3.3-V switching with 2.5-V V_CCas well as bidirectional data flow with near-zero propagation delay and low input and output capacitance that minimizes loading and signal distortion (C_io(OFF) = 4 pF Typical)

The SN74CB3Q16244 also provides a fast switching frequency (f_OE = 20 MHz Maximum) with data and control inputs that provide undershoot clamp diodes as well as low power consumption (I_CC = 1 mA Typical)

The V_CC operating range is from 2.3 V to 3.6 V and the data I/Os support 0 to 5-V signal levels of (0.8-V, 1.2-V, 1.5-V, 1.8-V, 2.5-V, 3.3-V, 5-V)

The control inputs can be driven by TTL or 5-V and 3.3-V CMOS outputs, and I_off supports partial-power-down mode operation.

9.4 Device Functional Modes

Table 1 lists the functional modes of the SN74CB3Q16244.