FSTD32211 Datasheet, PDF (1/7 Pages) Fairchild Semiconductor – 40/48-Bit Bus Switch with Level Shifting

September 2001
Revised July 2002
FSTD32211
40/48-Bit Bus Switch with Level Shifting
General Description
The Fairchild Switch FSTD32211 provides up to 48-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. A diode to V_CC has been
integrated into the circuit to allow for level shifting between
5V inputs and 3.3V outputs.
The device can be organized as four 12-bit, two 24-bit, or
one 48-bit bus switch. When routed as a 40-bit bus switch,
the device can be organized as four 10-bit, two 20-bit or
one 40-bit bus switch. When OE₁ is LOW, the switch is ON
and Port 1A is connected to Port 1B. When OE₂ is LOW,
the switch is ON and Port 2A is connected to Port 2B.
When OE₃ is LOW, the switch is ON and Port 3A is con-
nected to Port 3B. When OE₄ is LOW, the switch is ON and
Port 4A is connected to Port 4B. When OE₁, OE₂, OE₃, or
OE₄ are HIGH, a high impedance state exists between the
A and B Ports.
Features
I 4Ω switch connection between two ports
I Voltage level shifting
I Minimal propagation delay through the switch
I Low l_CC
I Zero bounce in flow-through mode
I Control inputs compatible with TTL level
I Packaged in plastic Fine-Pitch Ball Grid Array (FBGA)
Ordering Code:
Order Number Package Number
Package Description
FSTD32211G
(Note 1)(Note 2)
BGA114A
114-Ball Fine-Pitch Ball Grid Array (FBGA), JEDEC MO-205, 5.5mm Wide
Note 1: Ordering code “G” indicates Trays.
Note 2: Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Diagram
© 2002 Fairchild Semiconductor Corporation DS500378
www.fairchildsemi.com