FSTD3306 Datasheet, PDF (1/5 Pages) Fairchild Semiconductor – 2-Bit Low Power Bus Switch with Level Shifting

February 2001
Revised February 2001
FSTD3306
2-Bit Low Power Bus Switch with Level Shifting
General Description
The FSTD3306 is a 2-bit ultra high-speed CMOS FET bus
switch with enhanced level shifting circuitry and with TTL-
compatible active LOW control inputs. The low on resis-
tance of the switch allows inputs to be connected to out-
puts with minimal propagation delay and without
generating additional ground bounce noise. The device is
organized as a 2-bit switch with independent bus enable
(BE) controls. When BE is LOW, the switch is ON and Port
A is connected to Port B. When BE is HIGH, the switch is
OPEN and a high-impedance state exists between the two
ports. Reduced voltage drive to the gate of the FET switch
permits nominal level shifting of 5V to 3V through the
switch. Control inputs tolerate voltages up to 5.5V indepen-
dent of V_CC.
Features
s Typical 3Ω switch resistance at 5.0V V_CC, V_IN = 0V
s Level shift facilitates 5V to 3.3V interfacing
s Minimal propagation delay through the switch
s Power down high impedance input/output
s Zero bounce in flow through mode
s TTL compatible active LOW control inputs
s Control inputs are overvoltage tolerant
Ordering Code:
Order Number Package Number
Package Description
FSTD3306MTC
MTC08
8-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 Name
A
B
BE
Description
Bus A Switch I/O
Bus B Switch I/O
Bus Enable Input
(Top View)
Function Table
Bus Enable Input (BE)
L
H
H = HIGH Logic Level
L = LOW Logic Level
Function
B Connected to A
Disconnected
© 2001 Fairchild Semiconductor Corporation DS500480
www.fairchildsemi.com