SN74CB3Q3245 8-Bit 2.5-V/3.3-V Low-Voltage FET Bus Switch | TI.com

SN74CB3Q3245 (ACTIVE)

8-Bit 2.5-V/3.3-V Low-Voltage FET Bus Switch

8-Bit 2.5-V/3.3-V Low-Voltage FET Bus Switch - SN74CB3Q3245
Datasheet
 

Description

The SN74CB3Q3245 is a high-bandwidth FET bus switch utilizing a charge pump to elevate the gate voltage of the pass transistor, providing a low and flat ON-state resistance (ron). The low and flat ON-state resistance allows for minimal propagation delay and supports rail-to-rail switching on the data input/output (I/O) ports. The device also features low data I/O capacitance to minimize capacitive loading and signal distortion on the data bus. Specifically designed to support high-bandwidth applications, the SN74CB3Q3245 provides an optimized interface solution ideally suited for broadband communications, networking, and data-intensive computing systems.

The SN74CB3Q3245 is organized as an 8-bit bus switch with a single output-enable (OE\) input. When OE\ is low, the bus switch is ON and the A port is connected to the B port, allowing bidirectional data flow between ports. When OE\ is high, the bus switch is OFF and a high-impedance state exists between the A and B ports.

This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry prevents damaging current 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.

Features

  • High-Bandwidth Data Path (Up to 500 MHz)
  • Equivalent to IDTQS3VH384 Device
  • 5-V Tolerant I/Os with Device Powered-Up or Powered-Down
  • Low and Flat ON-State Resistance (ron) Characteristics Over Operating Range (ron = 4 Typical)
  • Rail-to-Rail Switching on Data I/O Ports
    • 0- to 5-V Switching With 3.3-V VCC
    • 0- to 3.3-V Switching With 2.5-V VCC
  • Bidirectional Data Flow, With Near-Zero Propagation Delay
  • Low Input/Output Capacitance Minimizes Loading and Signal Distortion (Cio(OFF) = 3.5 pF Typical)
  • Fast Switching Frequency (fOE\ = 20 MHz Max)
  • Data and Control Inputs Provide Undershoot Clamp Diodes
  • Low Power Consumption (ICC = 1 mA Typical)
  • VCC Operating Range From 2.3 V to 3.6 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, Class II
  • 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: PCI Interface, Differential Signal Interface, Memory Interleaving, Bus Isolation, Low-Distortion Signal Gating

For additional information regarding the performance characteristics of the CB3Q family, refer to the TI application report, CBT-C, CB3T, and CB3Q Signal-Switch Families, literature number SCDA008.

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Configuration
Number of Channels (#)
Power Supply Type
Vss (Min) (V)
Vss (Max) (V)
Vdd (Min) (V)
Vdd (Max) (V)
Ron (Typ) (Ohms)
Bandwidth (MHz)
Rating
Operating Temperature Range (C)
Package Size: mm2:W x L (PKG)
Package Group
Supply Range (Max)
Ron (Max) (Ohms)
Input/Output Continuous Current (Max) (mA)
Supply Current (Typ) (uA)
Supply Current (Max) (uA)
Features
OFF-state leakage current (Max) (µA)
ON-state leakage current (Max) (µA)
Input/Output ON-state Capacitance (Typ) (pF)
Input/Output OFF-state Capacitance (Typ) (pF)
ESD Charged Device Model (kV)
ESD HBM (kV)
VIL (Max) (V)
VIH (Min) (V)
SN74CB3Q3245 SN74CBT3245A SN74CBT3245C SN74CBTLV3245A
1:1 SPST     1:1 SPST     1:1 SPST     1:1 SPST    
8     8     8     8    
Single     Single     Single     Single    
N/A     N/A     N/A     N/A    
N/A     N/A     N/A     N/A    
2.3     4     4     2.3    
3.6     5.5     5.5     3.6    
4     5     3     5    
500     200     200     200    
Catalog     Catalog     Catalog     Catalog    
-40 to 85     -40 to 85     -40 to 85     -40 to 85    
20BGA MICROSTAR JUNIOR: 12 mm2: 3 x 4(BGA MICROSTAR JUNIOR)
20SSOP: 52 mm2: 6 x 8.65(SSOP)
20TSSOP: 42 mm2: 6.4 x 6.5(TSSOP)
20TVSOP: 32 mm2: 6.4 x 5(TVSOP)
20VQFN: 16 mm2: 3.5 x 4.5(VQFN)    
20BGA MICROSTAR JUNIOR: 12 mm2: 3 x 4(BGA MICROSTAR JUNIOR)
20SOIC: 132 mm2: 10.3 x 12.8(SOIC)
20SSOP: 52 mm2: 6 x 8.65(SSOP)
20SSOP: 56 mm2: 7.8 x 7.2(SSOP)
20TSSOP: 42 mm2: 6.4 x 6.5(TSSOP)
20TVSOP: 32 mm2: 6.4 x 5(TVSOP)
20VQFN: 16 mm2: 3.5 x 4.5(VQFN)    
20SOIC: 132 mm2: 10.3 x 12.8(SOIC)
20SSOP: 52 mm2: 6 x 8.65(SSOP)
20SSOP: 56 mm2: 7.8 x 7.2(SSOP)
20TSSOP: 42 mm2: 6.4 x 6.5(TSSOP)
20TVSOP: 32 mm2: 6.4 x 5(TVSOP)
20VQFN: 16 mm2: 3.5 x 4.5(VQFN)    
20BGA MICROSTAR JUNIOR: 12 mm2: 3 x 4(BGA MICROSTAR JUNIOR)
20SOIC: 132 mm2: 10.3 x 12.8(SOIC)
20SSOP: 52 mm2: 6 x 8.65(SSOP)
20TSSOP: 42 mm2: 6.4 x 6.5(TSSOP)
20TVSOP: 32 mm2: 6.4 x 5(TVSOP)
20VQFN: 16 mm2: 3.5 x 4.5(VQFN)    
BGA MICROSTAR JUNIOR
SSOP
TSSOP
TVSOP
VQFN    
BGA MICROSTAR JUNIOR
SOIC
SSOP
SSOP
TSSOP
TVSOP
VQFN    
SOIC
SSOP
SSOP
TSSOP
TVSOP
VQFN    
BGA MICROSTAR JUNIOR
SOIC
SSOP
TSSOP
TVSOP
VQFN    
3.6     5.5     5.5     3.6    
9     15     12     40    
64     128     128     128    
1          
4     3     3     10    
Powered off protection       Powered off protection
-2V undershoot protection    
Powered off protection    
1     5     10     60    
  5       60    
9       14      
3.5     4     5.5     9    
1       1      
2       2     2    
0.8     0.8     0.8     0.8    
1.7     2     2     2