FEATURES

· Member of the Texas Instruments Widebus™

Family

· 5-W Switch Connection Between Two Ports

· Rail-to-Rail Switching on Data I/O Ports

· Ioff Supports Partial-Power-Down Mode

Operation

· B-Port Outputs Are Precharged by Bias

Voltage to Minimize Signal Distortion During

Live Insertion

· Latch-Up Performance Exceeds 100 mA Per

JESD 78, Class II

· ESD Protection Exceeds JESD 22

– 2000-V Human-Body Model (A114-A)

– 200-V Machine Model (A115-A)

DESCRIPTION/ORDERING INFORMATION

The SN74CBTLV16800 provides 20 bits of

high-speed bus switching. The low on-state

resistance of the switch allows connections to be

made with minimal propagation delay. The device

also precharges the B port to a user-selectable bias

voltage (BIASV) to minimize live-insertion noise.

The device is organized as dual 10-bit bus switches

with separate output-enable (OE) inputs. It can be

used as two 10-bit bus switches or one 20-bit bus

switch. When OE is low, the associated 10-bit bus

switch is on, and port A is connected to port B. When

OE is high, the switch is open, the high-impedance

state exists between the two ports, and port B is

precharged to BIASV through the equivalent of a

10-kW resistor.

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.