Texas Instruments SN74CB3T3245 8-Bit FET Bus Switches

Texas Instruments SN74CB3T3245 8-Bit FET Bus Switches are high-speed, TTL-compatible switches with low ON-state resistance (R_ON) for minimal propagation delay. These bus switches support mixed-mode signal operation on all data I/O ports by providing voltage translation that tracks V_CC. The SN74CB3T3245 bus switches feature a standard 245-type pinout, 5V-tolerant I/Os with device powered up or powered down, and output voltage translation tracks. Typical applications include level translation, PCI interface, USB interface, memory interleaving, and bus isolation.

Features

Standard 245-type pinout
Output voltage translation tracks V_CC
Supports mixed-mode signal operation on all data I/O ports:
- 5V input down to 3.3V output level shift with 3.3V V_CC
- 5V/3.3V input down to 2.5V output level shift with 2.5V V_CC
5V-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 = 5Ω typical)
Low Input, output capacitance minimizes loading (C_IO(OFF) = 5pF typical)
Data and control inputs provide undershoot clamp diodes
Low power consumption (I_CC = 40μA maximum)
V_CC operating range from 2.3V to 3.6V
Data I/Os support 0 to 5V signaling levels (0.8V, 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, and 5V)

Control inputs can be driven by TTL or 5V/3.3V CMOS outputs
I_off supports partial-power-down mode operation
Latch-up performance exceeds 250mA per JESD 17
ESD performance tested per JESD 22:
- 2000V human-body model (A114-B, Class II)
- 1000V charged-device model (C101)
Designed for low-power portable equipment