FSTD3125_12 Datasheet, PDF (1/8 Pages) Fairchild Semiconductor – 4-Bit Bus Switch with Level Shifting

May 2012
FSTD3125 — 4-Bit Bus Switch with Level Shifting
Features
 4Ω Switch Connection between Two Ports
 Minimal Propagation Delay through the Switch
 Low I_CC
 Zero Bounce in Flow-through Mode
 Control Inputs Compatible with TTL Level
 TruTranslation Voltage Translation from 5.0V Inputs
to 3.3V Outputs
Description
Fairchild switch FSTD3125 provides four high-speed
CMOS TTL-compatible bus switches. 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 four one-bit switches with
separate /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.
Ordering Information
Operating
Part Number Temperature
Range
Package
FSTD3125MTCX
-40 to 85°C
14-Lead, Thin Shrink Small Outline Package (TSSOP), JEDEC
MO-153, 4mm Wide
Packing
Method
Tape and Reel
/OE₁ ¹
1A ²
/OE₂ ⁴
2A ⁵
10
/OE₃
3A ⁹
/OE₄ ¹³
4A ¹²
Figure 1. Logic Diagram
3 _1B
6 _2B
8 _3B
11 _4B
© 2001 Fairchild Semiconductor Corporation
FSTD3125 • Rev. 1.0.3
www.fairchildsemi.com