FST3244_08 Datasheet, PDF (1/9 Pages) Fairchild Semiconductor – 8-Bit Bus Switch

March 2008
FST3244 — 8-Bit Bus Switch
Features
ƒ 4Ω Switch Connection between Two Ports
ƒ Minimal Propagation Delay through the Switch
ƒ Low ICC
ƒ Zero Bounce in Flow-through Mode
ƒ Control Inputs Compatible with TTL Level
Description
The FST3244 switch provides eight-bits of high-speed,
CMOS, TTL-compatible bus switching in a standard
’244 pin-out. The low on resistance allows inputs to be
connected to outputs without adding propagation delay
or generating additional ground bounce noise.
The device is organized as two four-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
Packing
Method
FST3244WMX
FST3244QSCX
FST3244MTCX
-40 to +85°C
-40 to +85°C
-40 to +85°C
20-Lead, Small Outline Integrated Circuit (SOIC), JEDEC MS-013,
0.300-inch Wide
Tape and
Reel
20-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137,
0.150-inch Wide
Tape and
Reel
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, Tape and
4.4mm Wide
Reel
All packages are lead free per JEDEC: J-STD-020B standard.
The Fairchild switch family derives from and embodies Fairchild’s proven switch technology used for several years in its
74LVX3L384 (FST3384) bus switch product.
Logic Diagram
1A₀ ²
18 1B₀
1A₃ ⁸
12 _1B3
/OE₁ ¹
2A₀ ¹¹
2A₃ ¹⁷
9 _2B0
3 _2B3
© 1997 Fairchild Semiconductor Corporation
FST3244 • Rev. 1.0.3
/OE₂ ¹⁹
Figure 1. Logic Diagram
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