CBT6820 20-bit bus switch with precharged outputs and Schottky undershoot protection for live insertion20-bit bus switch with precharged outputs and Schottky undershoot protection for live insertion
TTL compatible inputs and outputs 5 switch connection between two port A and port B Thin shrink small outline (TSSOP) Undershoot protection included to prevent shoot through levelBias voltage pre-charges the outputs to minimize signal distortion
The CBT6820 provides twenty bits of high-speed TTL-compatible bus switching. The low on-state resistance of the switch allows bi-directional connections to be made while adding near-zero 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 two 10-bit switch with individual enable (OE) input. When OE is low, the switch is on and port A is connected to port B. When OE is high, the switch between port A and port B is open and the B port is precharged to BIASV through the equivalent 10 k resistor. Special clamp circuitry and Schottky diode clamps to ground are used to prevent an under voltage on the A side (Vin < GND) from causing the B side precharge voltage to drop below the ``1" state.
SYMBOL tPLH/tPHL CIN CI/O PARAMETER Propagation delay to An Input capacitance Input/output capacitance Outputs disabled; V or VCC CONDITIONS Tamb = 25�C; GND = 50 pF, VCC 5 V TYPICAL 4.5 9.5 UNIT ns pF
PACKAGES 48-Pin Plastic TSSOP Type II TEMPERATURE RANGE to +85�C ORDER CODE CBT6820 DGG DWG NUMBER SOT362�1OE High voltage level L = Low voltage level Z = High impedance "off " state STATE
SYMBOL VCC IIK VI ISW VBIASV Tstg �JA PARAMETER DC supply voltage DC clamp diode current DC input 0 to VCC < 0 CONDITIONS RATING 150 104 UNIT V �C �C/W
DC continuous channel current DC bias voltage Storage temperature range Plastic thin shrink small outline package (TSSOP)
NOTE: 1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
LIMITS SYMBOL VCC BIASV VIH VIL Tamb DC supply voltage DC supply voltage High-level input voltage (control pin) Low-level Input voltage (control pin) Operating free-air temperature range �40 PARAMETER Min Max 5.5 VCC �C UNIT