24-Bit Bus Switch with Level Shifting

The Fairchild Switch FSTD16211 provides 24-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 VCC has been integrated into the circuit to allow for level shifting between 5V inputs and 3.3V outputs.

The device is organized as a 12-bit or 24-bit bus switch. When OE#1 is LOW, the switch is ON and Port 1A is connected to Port 1B. When OE#2 is LOW, Port 2A is connected to Port 2B. When OE#1/2 is HIGH, a high impedance state exists between the A and B Ports.


  • 4ohm switch connection between two ports
  • Voltage level shifting
  • Minimal propagation delay through the switch
  • Low lCC
  • Zero bounce in flow-through mode
  • Control inputs compatible with TTL level
  • Also packaged in plastic Fine-Pitch Ball Grid Array (FBGA)
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Product Product &
Eco Status
Unit Price/
1K Order
Packing Method Convention Package Marking
FSTD16211MTDX Full Production
Green as of May 2012

TSSOP 56L  -  Details
1.1 x 6.1 x 14mm,  TAPE REEL

PDF TSSOP 56L  Drawing
Last Update: Jan 2015 PDF TSSOP (6.1mm) 48 and 56 Packing
Last Update: Oct 2015 PDF MTD56 TSSOP56 Leads, Packing Drawing
Last Update: Oct 2015
Line 1$Y (Fairchild logo)
&Z (Plant Code)
&2 (2-Digit Date Code)

Line 2FSTD16211

FIT 15.5 @55°C
change temp

Moisture Sensitivity Level (MSL) 2

Max Reflow Temp 260


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Application Note Description
AN-996 PDFUsing the Fairchild Switch as a 5V to 3V Translator
Last Update : 28-Jun-2014

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