FST34X245QSPX

FST34X245QSPX Datasheet

FST34X245 32-Bit Bus Switch

Part	Datasheet
FST34X245QSPX	FST34X245QSPX (pdf)

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FST34X245 32-Bit Bus Switch FST34X245 32-Bit Bus Switch The Fairchild Switch FST34X245 provides 32-bits of high speed CMOS TTL-compatible bus switching in a standard flow-through mode. 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 device is organized as a 32-bit switch. When OE is LOW, the switch is ON and Port A is connected to Port B. When OE is HIGH, the switch is OPEN and a high-impedance state exists between the two ports. s switch connection between two ports s Minimal propagation delay through the switch s Low lCC s Zero bounce in flow-through mode s Control inputs compatible with TTL level s 32-bit version of FST3245 s Packaged in 20.5mm 80-lead package Ordering Code: Order Number Package Number Package Description FST34X245QSP MQA80A 80-Lead, QVSOP, JEDEC MO-154, Wide Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Logic Diagram 2001 Fairchild Semiconductor Corporation DS500554 FST34X245 Connection Diagram Pin Descriptions Pin Name OEn An Bn NC Function Table Input OEn L H Description Bus Switch Enable Bus A Bus B No Connect Function Connect Disconnect FST34X245 Absolute Maximum Ratings Note 1 Supply Voltage VCC DC Switch Voltage VS 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 −0.5V to +7.0V −0.5V to +7.0V −50 mA 128 mA +/− 100 mA −65°C to +150 °C Recommended Operating Conditions Note 3 Power Supply Operating VCC Input Voltage VIN Output Voltage VOUT Input Rise and Fall Time tr, tf Switch Control Input 4.0V to 5.5V 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 rating. The “Recommended Operating Conditions” table 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. DC Electrical Characteristics Parameter VCC V TA = −40 °C to +85 °C Units Note 4 Conditions Clamp Diode Voltage HIGH Level Input Voltage LOW Level Input Voltage Input Leakage Current OFF-STATE Leakage Current Switch On Resistance

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FST34X245 32-Bit Bus Switch

FST34X245 32-Bit Bus Switch

The Fairchild Switch FST34X245 provides 32-bits of high speed CMOS TTL-compatible bus switching in a standard flow-through mode. 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 device is organized as a 32-bit switch. When OE is LOW, the switch is ON and Port A is connected to Port B. When OE is HIGH, the switch is OPEN and a high-impedance state exists between the two ports.
s switch connection between two ports s Minimal propagation delay through the switch s Low lCC s Zero bounce in flow-through mode s Control inputs compatible with TTL level s 32-bit version of FST3245 s Packaged in 20.5mm 80-lead package
Ordering Code:

Order Number Package Number

Package Description

FST34X245QSP

MQA80A
80-Lead, QVSOP, JEDEC MO-154, Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Logic Diagram
2001 Fairchild Semiconductor Corporation DS500554

FST34X245

Connection Diagram

Pin Descriptions

Pin Name OEn An Bn NC

Function Table

Input OEn L H

Description Bus Switch Enable

Bus A Bus B No Connect

Function Connect Disconnect

FST34X245

Absolute Maximum Ratings Note 1

Supply Voltage VCC DC Switch Voltage VS 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 −0.5V to +7.0V −0.5V to +7.0V
−50 mA 128 mA +/− 100 mA −65°C to +150 °C

Recommended Operating Conditions Note 3

Power Supply Operating VCC Input Voltage VIN Output Voltage VOUT Input Rise and Fall Time tr, tf

Switch Control Input
4.0V to 5.5V 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 rating. The “Recommended Operating Conditions” table 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.

DC Electrical Characteristics

Parameter

VCC V

TA = −40 °C to +85 °C

Units

Note 4

Conditions

Clamp Diode Voltage

HIGH Level Input Voltage

LOW Level Input Voltage

Input Leakage Current

OFF-STATE Leakage Current

Switch On Resistance

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Datasheet ID: FST34X245QSPX 515551