FSTU32X800QSP

FSTU32X800QSP Datasheet

FSTU32X800 20-Bit Bus Switch with Precharged Outputs

Part	Datasheet
FSTU32X800QSP	FSTU32X800QSP (pdf)

Related Parts	Information
FSTU32X800QSPX	FSTU32X800QSPX

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FSTU32X800 20-Bit Bus Switch with Precharged Outputs FSTU32X800 20-Bit Bus Switch with Precharged Outputs and −2V Undershoot Protection The Fairchild Switch FSTU32X800 provides 20-bits of high-speed CMOS TTL-compatible bus switching. The low On Resistance of the switch allows inputs to be connected to outputs without adding propagation delay or generating additional ground bounce noise. The A and B Ports are protected against undershoot to support an extended range to 2.0V below ground. Fairchild’s integrated Undershoot Hardened Circuit senses undershoot at the I/O and responds by preventing voltage differentials from developing and turning the switch on. The device also precharges the B Port to a selectable bias voltage BiasV to minimize live insertion noise. The device is organized as two 10-bit switches with a bus enable OEn signal. When OEn is LOW, the switch is ON and Port A is connected to Port B. When OEn is HIGH, the switch is OPEN and the B Port is precharged to BiasV through an equivalent resistor. s switch connection between two ports s Undershoot Hardened to -2.0V s Soft enable turn-on to minimize bus-to-bus charge sharing during enable s Low lCC s Zero bounce in flow-through mode s Output precharge to minimize live insertion noise s Control inputs compatible with TTL level s See Applications Note AN-5008 for details Ordering Code: Order Number Package Number Package Description FSTU32X800QSP MQA48A 48-Lead Quarter Size Very Small Outline Package QVSOP , JEDEC MO-154, Wide Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. is a registered trademark of Fairchild Semiconductor Corporation. 2002 Fairchild Semiconductor Corporation DS500791 FSTU32X800 Logic Diagrams Connection Diagram Pin Descriptions Pin Name OEn A B BiasVn Bus Switch Enable Bus A Bus B Bus B Voltage Bias Truth Table OEn L H BiasV Function Connect Precharge FSTU32X800 Absolute Maximum Ratings Note 1 Supply Voltage VCC DC Switch Voltage VS Bias V Voltage Range DC Input Voltage VIN Note 2 DC Input Diode Current lIK VIN< 0V DC Output IOUT Sink Current DC VCC/GND Current ICC/IGND Storage Temperature Range TSTG −0.5V to +7.0V −2.0V to +7.0V −0.5V to +7.0V −0.5V to +7.0V −50 mA 128 mA +/− 100 mA −65°C to +150 °C DC Electrical Characteristics Recommended Operating Conditions Note 3 Power Supply Operating VCC Precharge Supply BiasV Input Voltage VIN Output Voltage VOUT Input Rise and Fall Time tr, tf Switch Control Input 4.0V to 5.5V 1.5V to VCC 0V to 5.5V 0V to 5.5V 0 ns/V to 5 ns/V Switch I/O 0 ns/V to DC Free Air Operating Temperature TA −40 °C to +85 °C Note 1 The Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The Recommended Operating Conditions tables will define the conditions for actual device operation. Note 2 The input and output negative voltage ratings may be exceeded if the input and output diode current ratings are observed. Note 3 Unused control inputs must be held HIGH or LOW. They may not float. Parameter TA = −40 °C to +85 °C VCC V Units Note 4 Conditions

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FSTU32X800 20-Bit Bus Switch with Precharged Outputs

FSTU32X800
20-Bit Bus Switch with Precharged Outputs and −2V Undershoot Protection

The Fairchild Switch FSTU32X800 provides 20-bits of high-speed CMOS TTL-compatible bus switching. The low On Resistance of the switch allows inputs to be connected to outputs without adding propagation delay or generating additional ground bounce noise. The A and B Ports are protected against undershoot to support an extended range to 2.0V below ground. Fairchild’s integrated Undershoot Hardened Circuit senses undershoot at the I/O and responds by preventing voltage differentials from developing and turning the switch on. The device also precharges the B Port to a selectable bias voltage BiasV to minimize live insertion noise.

The device is organized as two 10-bit switches with a bus enable OEn signal. When OEn is LOW, the switch is ON and Port A is connected to Port B. When OEn is HIGH, the switch is OPEN and the B Port is precharged to BiasV through an equivalent resistor.
s switch connection between two ports s Undershoot Hardened to -2.0V s Soft enable turn-on to minimize bus-to-bus charge
sharing during enable s Low lCC s Zero bounce in flow-through mode s Output precharge to minimize live insertion noise s Control inputs compatible with TTL level s See Applications Note AN-5008 for details
Ordering Code:

Order Number

Package Number

Package Description

FSTU32X800QSP MQA48A 48-Lead Quarter Size Very Small Outline Package QVSOP , JEDEC MO-154, Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
is a registered trademark of Fairchild Semiconductor Corporation.
2002 Fairchild Semiconductor Corporation DS500791

FSTU32X800

Logic Diagrams

Connection Diagram

Pin Descriptions

Pin Name OEn A B

BiasVn

Bus Switch Enable Bus A Bus B

Bus B Voltage Bias

Truth Table

OEn L H

BiasV

Function Connect Precharge

FSTU32X800

Absolute Maximum Ratings Note 1

Supply Voltage VCC DC Switch Voltage VS Bias V Voltage Range

DC Input Voltage VIN Note 2 DC Input Diode Current lIK VIN< 0V DC Output IOUT Sink Current DC VCC/GND Current ICC/IGND Storage Temperature Range TSTG
−0.5V to +7.0V −2.0V to +7.0V −0.5V to +7.0V −0.5V to +7.0V
−50 mA 128 mA +/− 100 mA −65°C to +150 °C

DC Electrical Characteristics

Recommended Operating Conditions Note 3

Power Supply Operating VCC Precharge Supply BiasV

Input Voltage VIN Output Voltage VOUT Input Rise and Fall Time tr, tf

Switch Control Input
4.0V to 5.5V 1.5V to VCC
0V to 5.5V 0V to 5.5V
0 ns/V to 5 ns/V

Switch I/O
0 ns/V to DC

Free Air Operating Temperature TA −40 °C to +85 °C

Note 1 The Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The Recommended Operating Conditions tables will define the conditions for actual device operation.

Note 2 The input and output negative voltage ratings may be exceeded if the input and output diode current ratings are observed.

Note 3 Unused control inputs must be held HIGH or LOW. They may not float.

Parameter

TA = −40 °C to +85 °C

VCC V

Units

Note 4

Conditions

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Datasheet ID: FSTU32X800QSP 515558