IDTQS3388 Datasheet, PDF (1/6 Pages) Integrated Device Technology – QUICKSWITCH PRODUCTS HIGH-SPEED CMOS BUS EXCHANGE SWITCH WITH ACTIVE TERMINATION(BUS HOLD)

IDTQS3388
HIGH-SPEED CMOS BUS EXCHANGE SWITCH WITH ACTIVE TERMINATION
INDUSTRIAL TEMPERATURE RANGE
QUICKSWITCH^® PRODUCTS
HIGH-SPEED CMOS BUS EXCHANGE
SWITCH WITH ACTIVE TERMINATION
(BUS HOLD)
IDTQS3388
FEATURES:
• Enhanced N channel FET with no inherent diode to Vcc
• 5Ω bidirectional switches connect inputs to outputs
• Active termination drives bus pins to rails when switches are
off
• Zero propagation delay, zero added ground bounce
• Undershoot clamp diodes on all switch and control inputs
• Bus exchange allows nibble swap
• TTL-compatible input and output levels
• Bus-hold eliminates floating bus lines and reduces static
power consumption
• Available in QSOP package
DESCRIPTION:
The QS3388 provides ten high-speed CMOS TTL-compatible bus
switches with active terminators on the bus switch I/O pins. The low ON
resistance (5Ω) of the 3388 allows inputs to be connected to outputs without
adding propagation delay and without generating additional ground bounce
noise. When the switches are turned off, a low drive active terminator circuit
drives the disconnected pins to VCC or ground, away from the TTL threshold.
This prevents undriven buses from floating. The Bus Enable (BE) signal
turns the switches on. The Bus Exchange (BX) signal provides nibble swap
of the AB and CD pairs of signals. This exchange configuration allows byte
swapping of buses in systems. It can also be used as a five-wide 2-to-1
multiplexer and to create low delay barrel shifters, etc.
The QS3388 is characterized for operation at -40°C to +85°C.
APPLICATIONS:
• Resource sharing
• Crossbar switching
• Last value latch (graphics and DSP)
FUNCTIONAL BLOCK DIAGRAM
A0
T
C0
T
R
B0
T
D0
T
T⁼
A4
T
C4
T
B4
T
D4
T
BX
BE
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
c
2000 Integrated Device Technology, Inc.
APRIL 2000
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