FSTD16861_05 Datasheet, PDF (1/6 Pages) Fairchild Semiconductor – 20-Bit Bus Switch with Level Shifting

May 2001
Revised June 2005
FSTD16861
20-Bit Bus Switch with Level Shifting
General Description
The Fairchild Switch FSTD16861 provides 20-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 is organized as a 10-bit or 20-bit bus switch.
When OE₁ is LOW, the switch is ON and Port 1A is con-
nected to Port 1B. When OE₂ is LOW, Port 2A is connected
to Port 2B. When OE_X is HIGH, a high impedance state
exists between the A and B Ports.
Features
s 4: switch connection between two ports.
s Minimal propagation delay through the switch.
s Low l_CC.
s Zero bounce in flow-through mode.
s Control inputs compatible with TTL level.
s TruTranslation¥ voltage translation from 5.0V inputs to
3.3V outputs
s Power-off high impedance inputs and outputs
s Supports live insertion/withdrawal (Note 1)
Note 1: To ensure the high-impedance state during power up or power
down, OE should be tied to V_CC through a pull-up resistor; the minimum
value of the resistor is determined by the current-sourcing capability of the
driver.
Ordering Code:
Order Number Package Number
Package Description
FSTD16861MTD
MTD48
48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
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© 2005 Fairchild Semiconductor Corporation DS500421
www.fairchildsemi.com