FSTD3125_05 Datasheet, PDF (1/7 Pages) Fairchild Semiconductor – 4-Bit Bus Switch with Level Shifting

June 2001
Revised January 2005
FSTD3125
4-Bit Bus Switch with Level Shifting
General Description
The Fairchild Switch FSTD3125 provides four high-speed
CMOS TTL-compatible bus switches. The low On Resis-
tance of the switch allows inputs to be connected to out-
puts 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 four 1-bit switches with sepa-
rate OE inputs. When OE is LOW, the switch is ON and
Port A is connected to Port B. When OE is HIGH, the
switch is OPEN and a high-impedance state exists
between the two ports.
Features
s 4Ω 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
Ordering Code:
Order
Number
Package
Number
Package Description
FSTD3125M
M14A 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
FSTD3125QSC
MQA16 16-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150" Wide
FSTD3125MTC
MTC14 14-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
FSTD3125MTC_NL MTC14 Pb-Free 14-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.
Pb-Free package per JEDEC J-STD-020B.
Connection Diagrams
Pin Descriptions
Pin Assignment for SOIC and TSSOP
Pin Name
OE₁, OE₂, OE₃, OE₄
1A, 2A, 3A, 4A
1B, 2B, 3B, 4B
NC
Description
Bus Switch Enables
Bus A
Bus B
Not Connected
Truth Table
Pin Assignment for QSOP
Inputs
OE
L
H
Inputs/Outputs
A, B
A=B
Z
TruTranslation is a trademark of Fairchild Semiconductor Corporation.
© 2005 Fairchild Semiconductor Corporation DS500448
www.fairchildsemi.com