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SN74CBT3305C Datasheet Preview

SN74CBT3305C Datasheet

DUAL FET BUS SWITCH

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www.ti.com
SN74CBT3305C
DUAL FET BUS SWITCH
5-V BUS SWITCH WITH –2-V UNDERSHOOT PROTECTION
SCDS125B – SEPTEMBER 2003 – REVISED AUGUST 2005
FEATURES
Undershoot Protection for OFF Isolation on A
and B Ports up to –2 V
Bidirectional Data Flow With Near-Zero
Propagation Delay
Low ON-State Resistance (ron) Characteristics
(ron = 3 Typ)
Low Input/Output Capacitance Minimizes
Loading and Signal Distortion
(Cio(OFF) = 5 pF Typ)
Data and Control Inputs Provide Undershoot
Clamp Diodes
Low Power Consumption
(ICC = 3 µA Max)
VCC Operating Range From 4 V to 5.5 V
Data I/Os Support 0- to 5-V Signaling Levels
(0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, 5 V)
Control Inputs Can Be Driven by TTL or
5-V/3.3-V CMOS Outputs
Ioff Supports Partial-Power-Down Mode
Operation
Latch-Up Performance Exceeds 100 mA Per
JESD 78, ClassII
ESD Performance Tested Per JESD 22
– 2000-V Human-Body Model
(A114-B, Class II)
– 1000-V Charged-Device Model (C101)
Supports Both Digital and Analog
Applications: USB Interface, Bus Isolation,
Low-Distortion Signal Gating
xxx
xxx
D, DGK, OR PW PACKAGE
(TOP VIEW)
1OE 1
1A 2
1B 3
GND 4
8 VCC
7 2OE
6 2B
5 2A
DESCRIPTION/ORDERING INFORMATION
The SN74CBT3305C is a high-speed TTL-compatible FET bus switch with low ON-state resistance (ron), allowing
for minimal propagation delay. Active undershoot-protection circuitry on the A and B ports of the device provides
protection for undershoot up to –2 V by sensing an undershoot event and ensuring that the switch remains in the
proper OFF state.
The SN74CBT3305C is organized as two 1-bit bus switches with separate output-enable (1OE, 2OE) inputs. It
can be used as two 1-bit bus switches or as one 2-bit bus switch. When OE is high, the associated 1-bit bus
switch is ON, and the A port is conncected to the B port, allowing bidirectional data flow between ports. When
OE is low, the associated 1-bit bus switch is OFF, and the high-impedance state exists between the A and B
ports.
TA
–40°C to 85°C
ORDERING INFORMATION
PACKAGE (1)
ORDERABLE PART NUMBER
TOP-SIDE MARKING
SOIC – D
Tube
Tape and reel
SN74CBT3305CD
SN74CBT3305CDR
CU305C
VSSOP – DGK
Tape and reel
SN74CBT3305CDGKR
SNR
TSSOP – PW
Tube
Tape and reel
SN74CBT3305CPW
SN74CBT3305CPWR
CU305C
(1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2003–2005, Texas Instruments Incorporated




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SN74CBT3305C Datasheet Preview

SN74CBT3305C Datasheet

DUAL FET BUS SWITCH

No Preview Available !

SN74CBT3305C
DUAL FET BUS SWITCH
5-V BUS SWITCH WITH –2-V UNDERSHOOT PROTECTION
SCDS125B – SEPTEMBER 2003 – REVISED AUGUST 2005
www.ti.com
DESCRIPTION/ORDERING INFORMATION (CONTINUED)
This device is fully specified for partial-power-down application 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 GND through a
pulldown resistor; the minimum value of the resistor is determined by the current-sourcing capability of the driver.
INPUT
OE
H
L
FUNCTION TABLE
(EACH BUS SWITCH)
INPUT/OUTPUT
A
B
Z
FUNCTION
A port = B port
Disconnect
LOGIC DIAGRAM (POSITIVE LOGIC)
2
1A
1
1OE
3
SW
1B
5
2A
7
2OE
6
SW
2B
SIMPLIFIED SCHEMATIC, EACH FET SWITCH (SW)
A
B
Undershoot-
Protection Circuit
EN(1)
(1) EN is the internal enable signal applied to the switch.
2


Part Number SN74CBT3305C
Description DUAL FET BUS SWITCH
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