FSTU6800WMX

FSTU6800WMX Datasheet

FSTU6800 10-Bit Bus Switch with Precharged Outputs

Part	Datasheet
FSTU6800WMX	FSTU6800WMX (pdf)

Related Parts	Information
FSTU6800QSCX	FSTU6800QSCX
FSTU6800MTC	FSTU6800MTC
FSTU6800MTCX	FSTU6800MTCX

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FSTU6800 10-Bit Bus Switch with Precharged Outputs FSTU6800 10-Bit Bus Switch with Precharged Outputs and −2V Undershoot Protection The Fairchild Switch FSTU6800 provides 10-bits of highspeed 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. Both the A Ports and the B Ports have “undershoot hardened” circuit protection to support an extended input range to 2.0V below ground. Fairchild’s integrated Undershoot Hardened Circuit senses undershoot at the I/Os, and responds by preventing voltage differentials from developing and turning on the switch. The device also precharges the B Port to a selectable bias voltage BiasV to minimize live insertion noise. The device is organized as a 10-bit switch with a bus enable OE signal. 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 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 FSTU6800WM M24B 24-Lead Small Outline Integrated Circuit SOIC , JEDEC MS-013, Wide FSTU6800QSC MQA24 24-Lead Quarter Size Outline Package QSOP , JEDEC MO-137, Wide FSTU6800MTC MTC24 24-Lead Thin Shrink Small Outline Package TSSOP , JEDEC MO-153, 4.4mm Wide Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Logic Diagram Connection Diagram Pin Descriptions Pin Name OE A B BiasV Bus Switch Enable Bus A Bus B Bus B Voltage Bias Truth Table BiasV is a registered trademark of Fairchild Semiconductor Corporation. 2000 Fairchild Semiconductor Corporation DS500194 Function Connect Precharge FSTU6800 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 −50mA 128mA +/− 100mA −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 0nS/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 5 Conditions Clamp Diode Voltage IIN = −18mA

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FSTU6800 10-Bit Bus Switch with Precharged Outputs

FSTU6800
10-Bit Bus Switch with Precharged Outputs and −2V Undershoot Protection

The Fairchild Switch FSTU6800 provides 10-bits of highspeed 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. Both the A Ports and the B Ports have “undershoot hardened” circuit protection to support an extended input range to 2.0V below ground. Fairchild’s integrated Undershoot Hardened Circuit senses undershoot at the I/Os, and responds by preventing voltage differentials from developing and turning on the switch. The device also precharges the B Port to a selectable bias voltage BiasV to minimize live insertion noise.

The device is organized as a 10-bit switch with a bus enable OE signal. 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 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

FSTU6800WM

M24B
24-Lead Small Outline Integrated Circuit SOIC , JEDEC MS-013, Wide

FSTU6800QSC

MQA24
24-Lead Quarter Size Outline Package QSOP , JEDEC MO-137, Wide

FSTU6800MTC

MTC24
24-Lead Thin Shrink Small Outline Package TSSOP , JEDEC MO-153, 4.4mm Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Logic Diagram

Connection Diagram

Pin Descriptions

Pin Name OE A B

BiasV

Bus Switch Enable Bus A Bus B

Bus B Voltage Bias

Truth Table

BiasV
is a registered trademark of Fairchild Semiconductor Corporation.
2000 Fairchild Semiconductor Corporation DS500194

Function Connect Precharge

FSTU6800

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
−50mA 128mA +/− 100mA −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
0nS/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 5

Conditions

Clamp Diode Voltage

IIN = −18mA

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Datasheet ID: FSTU6800WMX 515560