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FSTU6800MTCX bảng dữ liệu(PDF) 1 Page - Fairchild Semiconductor

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© 2000 Fairchild Semiconductor Corporation
DS500194
www.fairchildsemi.com
December 1998
Revised October 2006
FSTU6800
10-Bit Bus Switch with Precharged Outputs
and
−2V Undershoot Protection
General Description
The Fairchild Switch FSTU6800 provides 10-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. Both the A Ports and the B
Ports have “undershoot hardened” circuit protection to sup-
port an extended input range to 2.0V below ground. Fair-
child’s integrated Undershoot Hardened Circuit (UHC®)
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 select-
able 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 10-k
Ω resistor.
Features
s 4
Ω 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:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Diagram
Pin Descriptions
Connection Diagram
Truth Table
UHC® is a registered trademark of Fairchild Semiconductor Corporation.
Order Number
Package Number
Package Description
FSTU6800WM
M24B
24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
FSTU6800QSC
MQA24
24-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150 Wide
FSTU6800MTC
MTC24
24-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Pin Name
Description
OE
Bus Switch Enable
ABus A
BBus B
BiasV
Bus B Voltage Bias
OE
B0–B9
Function
LA0–A9
Connect
HBiasV
Precharge


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