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SN74CBT3305CPW-SN74CBT3305CPWR-SN74CBT3305CPWRG4
Dual FET Bus Switch with -2 V Undershoot-Protection
www.ti.com
FEATURES
D, DGK, OR PW PACKAGE
(TOP VIEW)1OE
GND
VCC
2OE
DESCRIPTION/ORDERING INFORMATION
SN74CBT3305C
DUAL FET BUS SWITCH
5-V BUS SWITCH WITH –2-V UNDERSHOOT PROTECTIONSCDS125B–SEPTEMBER 2003–REVISED AUGUST 2005
Undershoot Protection for OFF Isolation onA •
Control Inputs Can Be Driven by TTLor
andB Ports upto–2V 5-V/3.3-V CMOS Outputs Bidirectional Data Flow With Near-Zero •
Ioff Supports Partial-Power-Down Mode
Propagation Delay OperationClamp Diodes •
Supports Both Digital and Analog•
Low Power Consumption Applications: USB Interface, Bus Isolation,CC=3 μA
Max) Low-Distortion Signal Gating VCC Operating Range From4Vto 5.5V xxx
xxx•
Data I/Os Support0-to 5-V Signaling Levels
(0.8V, 1.2V, 1.5V, 1.8V, 2.5V, 3.3V,5V)The SN74CBT3305Cisa high-speed TTL-compatible FET bus switch with low ON-state resistance (ron), allowing
for minimal propagation delay. Active undershoot-protection circuitryon theA andB portsof the device provides
protection for undershoot upto–2Vby sensingan undershoot event and ensuring that the switch remainsin the
proper OFF state.
The SN74CBT3305Cis organizedas two 1-bit bus switches with separate output-enable (1OE, 2OE) inputs.It
can be usedas two 1-bit bus switchesor as one 2-bit bus switch. When OEis high, the associated 1-bit bus
switchis ON, and theA portis conncectedto theB port, allowing bidirectional data flow between ports. Whenis low, the associated 1-bit bus switchis OFF, and the high-impedance state exists between theA andB
