SN74CBT3244C Octal FET Bus Switch With -2 V Undershoot Protection | TI.com

SN74CBT3244C (ACTIVE)

Octal FET Bus Switch With -2 V Undershoot Protection

Octal FET Bus Switch With -2 V Undershoot Protection - SN74CBT3244C
Datasheet
 

Description

The SN74CBT3244C 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 SN74CBT3244C 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 SN74CBT3244C is organized as two 4-bit bus switches with separate output-enable (1OE\, 2OE\) inputs. It can be used as two 4-bit bus switches or as one 8-bit bus switch. When OE\ is low, the associated 4-bit 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 associated 4-bit bus switch is OFF, and the high-impedance state exists between the A and B ports.

This device is fully specified for partial-power-down applications using Ioff. The Ioff feature ensures that damaging current will not backflow through the device when it is powered down.

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

  • 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 Typical)
  • Low Input/Output Capacitance Minimizes Loading and Signal Distortion (Cio(OFF) = 5 pF Typical)
  • 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, 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: USB Interface, Memory Interleaving, Bus Isolation, Low-Distortion Signal Gating

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Parametrics Compare all products in Analog switches/muxes

 
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 (Max) (uA)
Features
OFF-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)
SN74CBT3244C
1:1 SPST    
8    
Single    
   
   
4    
5.5    
3    
200    
Catalog    
-40 to 85    
20SOIC: 132 mm2: 10.3 x 12.8 (SOIC | 20)
20SSOP: 52 mm2: 6 x 8.65 (SSOP | 20)
20TSSOP: 42 mm2: 6.4 x 6.5 (TSSOP | 20)
20TVSOP: 32 mm2: 6.4 x 5 (TVSOP | 20)
20VQFN: 16 mm2: 3.5 x 4.5 (VQFN | 20)    
SOIC | 20
SSOP | 20
TSSOP | 20
TVSOP | 20
VQFN | 20    
5.5    
12    
128    
50    
Powered off protection
-2V undershoot protection    
10    
14    
5.5    
1    
2    
0.8    
2