FSTU3384_06 Datasheet, PDF (1/5 Pages) Fairchild Semiconductor – 10-Bit Bus Switch with −2V Undershoot Protection

May 1999
Revised October 2006
FSTU3384
10-Bit Bus Switch with −2V Undershoot Protection
General Description
The Fairchild Switch FSTU3384 provides 10 bits of high-
speed CMOS TTL-compatible bus switches. The low on
resistance of the switch allows inputs to be connected to
outputs without adding propagation delay generating addi-
tional 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 is organized as two 5-bit switches with
separate bus enable (OE) signals. 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.
Features
s 4Ω switch connection between two ports
s Undershoot Hardened to -2.0V.
s Minimal propagation delay through the switch
s Low l_CC.
s Zero ground bounce in flow-through mode
s Control inputs compatible with TTL level
s See Applications Note AN-5008 for details.
Ordering Code:
Order Number Package Number
Package Description
FSTU3384WM
M24B
24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
FSTU3384QSC
MQA24
24-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150 Wide
FSTU3384MTC
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 Names
OE₁, OE₂
A₀–A₉
B₀–B₉
Description
Bus Switch Enable
Bus A
Bus B
Truth Table
OE₁ OE₂
B₀–B₄
B₅–B₉
Function
L
L A₀–A₄
L
H A₀–A₄
A₅–A₉
HIGH-Z State
Connect
Connect
H L HIGH-Z State A₅–A₉
Connect
H H HIGH-Z State HIGH-Z State Disconnect
UHC® is a registered trademark of Fairchild Semiconductor Corporation.
© 2000 Fairchild Semiconductor Corporation DS500195
www.fairchildsemi.com