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.

Parametrics

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Part number Order Configuration Number of channels (#) Power supply type Vdd (Min) (V) Vdd (Max) (V) Ron (Typ) (Ohms) Bandwidth (MHz) Rating Operating temperature range (C) 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) CON (Typ) (pF) COFF (Typ) (pF) ESD CDM (kV) ESD HBM (kV) VIL (Max) (V) VIH (Min) (V)
SN74CB3Q3245 Order now 1:1 SPST     8     Single     2.3     3.6     4     500     Catalog     -40 to 85     SSOP | 20
TSSOP | 20
TVSOP | 20
VQFN | 20    
3.6     9     64     1     4     Powered-off protection
Supports input voltage beyond supply    
1       9     3.5     1     2     0.8     1.7    
SN74CBT3245A Order now 1:1 SPST     8     Single     4     5.5     5     200     Catalog     -40 to 85     SOIC | 20
SSOP | 20
SSOP | 20
TSSOP | 20
TVSOP | 20
VQFN | 20    
5.5     15     128       3       5     5       4         0.8     2    
SN74CBT3245C Order now 1:1 SPST     8     Single     4     5.5     3     200     Catalog     -40 to 85     SOIC | 20
SSOP | 20
SSOP | 20
TSSOP | 20
TVSOP | 20
VQFN | 20    
5.5     12     128       3     Powered-off protection
Undershoot protection    
10       14     5.5     1     2     0.8     2    
SN74CBTLV3245A Order now 1:1 SPST     8     Single     2.3     3.6     5     200     Catalog     -40 to 85     SOIC | 20
SSOP | 20
TSSOP | 20
TVSOP | 20
VQFN | 20    
3.6     40