Fairchild FST3244 Data Handbook

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3244 O ctal B s S itch

June 1997 Revised December 1999

FST3244 Octal Bus Switch General Description Features The Fairchild Switch FST3244 provides 8-bits of high- 4Ω switch connection between two ports. speed CMOS TTL-compatible bus switching in a standard

Minimal propagation delay through the switch.

’244 pin-out. The low on resistance of the switch allows

Low l CC.

inputs to be connected to outputs without adding propaga-

tion delay or generating additional ground bounce noise. Zero bounce in flow-through mode. The device is organized as two 4-bit switches with separate Control inputs compatible with TTL level.

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 Code: Order Number Package Number Package Description FST3244WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide FST3244QSC MQA20 20-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150 Wide FST3244MTC MTC20 20-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

Truth Table

Inputs Inputs/Outputs

Pin Descriptions

OE1 OE2 1A, 1B 2A, 2B

Pin Name Description

OE1, OE2 Bus Switch Enable 1A = 1B

1A, 2A Bus A 2A = 2B 1B, 2B Bus B

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