Datasheet

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May 2009

FST3257 • Rev. 1.0.3

FST3257 — Quad 2:1 Multiplexer / Demultiplexer Bus Switch

FST3257

Quad 2:1 Multiplexer / Demultiplexer Bus Switch

Features

 4Ω Switch Connection Between Two Ports

 Minimal Propagation Delay Through the Switch

 Low I

 Zero Bounce in Flow-Through Node

 Control Inputs Compatible with TTL Level

Description

The Fairchild Switch FST3257 is a quad 2:1 high-speed

CMOS TTL-compatible multiplexer / demultiplexer bus

switch. The low on resistance of the switch allows

inputs to be connected to outputs without adding

propagation delay or generating additional ground

bounce noise.

When /OE is LOW, the select pin connects the A port to

the selected B port output. When /OE is HIGH, the

switch is OPEN and a high-impedance state exists

between the two ports.

Ordering Information

Part Number

Operating

Temperature

Range

Eco Status

Package

Packing

Method

FST3257M -40 to 85°C Tubes

FST3257MX -40 to 85°C

RoHS

16-Lead Small Outline Integrated Circuit

(SOIC) JEDEC MS-012,0.150 Narrow

Tape and Reel

FST3257QSC -40 to 85°C Tubes

FST3257QSCX -40 to 85°C

Green

16-Lead Quarter Size Outline Package

(QSOP) JEDEC MO-137 0.150 Inch Wide

Tape and Reel

FST3257MTC -40 to 85°C Tubes

FST3257MTCX -40 to 85°C

RoHS

16-Lead Thin Shrink Small Outline Package

(TSSOP) JEDEC MO-153, 4mm Wide

Tape and Reel

For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.

Summary of content (10 pages)

PAGE 1
FST3257 Quad 2:1 Multiplexer / Demultiplexer Bus Switch Features Description The Fairchild Switch FST3257 is a quad 2:1 high-speed CMOS TTL-compatible multiplexer / demultiplexer bus switch. The low on resistance of the switch allows inputs to be connected to outputs without adding propagation delay or generating additional ground bounce noise.
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Figure 1. Logic Diagram Figure 2.
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Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Symbol Parameter VCC Supply Voltage Min. Max. Unit -0.5 +7.0 V VS DC Switch Voltage -0.5 +7.
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Symbol VIK Parameter Conditions Clamp Diode Voltage IIN=-18mA VIH High-Level Input Voltage VIL Low-Level Input Voltage IIN Input Leakage Current IOZ Off-state Leakage Current ICC ΔICC Switch On Resistance (4) TA=-40 to +85°C Min. (3) Typ. 4.5 3.0 to 3.6 3.0 to 3.6 Units Max. -1.2 (5) 4.0 to 5.5 1.8 V V 2.0 (5) 0.7 V 4.0 to 5.5 0.8 0 ≤ VIN ≤ 5.5 5.5 ±1.0 µA 0 ≤ A, B ≤ VCC 5.5 ±1.0 µA 3.3 (5) VIN=0V, IIN=30mA 3.3 (5) 28 40 VIN=2.4V, IIN=15mA 3.
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TA=-40 to +85°C, CL= 50pF, RU=RD=500Ω Symbol Parameter Conditions VCC= 4.5 to 5.5V Min. tPHL,tPLH tPZH,tPZL tPHZ,tPLZ Propagation Delay (6) Bus to Bus Propagation Delay (6) Select to Bus A Output Enable Time, Select to Bus B Output Enable Time, Select to Bus /OE Output Disable Time, Select to Bus B Output Disable Time, Select to Bus /OE Max. VCC=4.0V Min. Max. Units Figure ns Figure 3 Figure 4 ns Figure 3 Figure 4 ns Figure 3 Figure 4 VCC=3.0 (7) to 3.6V Min. Max. 0.25 VIN=Open 0.
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Notes: 8. Input driven by 50Ω source terminated in 50Ω. 9. CL included load and stray capacitance. 10. Input PRR=1.0MHz, tw=500ns. Figure 3. AC Test Circuit FST3257 — Quad 2:1 Multiplexer / Demultiplexer Bus Switch AC Loadings and Waveforms Figure 4. AC Waveforms © 1997 Fairchild Semiconductor Corporation FST3257 • Rev. 1.0.3 www.fairchildsemi.
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10.00 9.80 A 8.89 16 9 B 4.00 3.80 6.00 PIN ONE NDICATOR 1.75 1 5.6 8 0.51 0.35 1.27 (0.30) 0.25 M 1.27 C B A 0.65 LAND PATTERN RECOMMENDATION 1.75 MAX 1.50 1.25 SEE DETAIL A 0.25 0.10 C 0.25 0.19 FST3257 — Quad 2:1 Multiplexer / Demultiplexer Bus Switch Physical Dimensions 0.10 C 0.50 0.25 X 45° NOTES: UNLESS OTHERWISE SPECIFIED (R0.10) GAGE PLANE A) THIS PACKAGE CONFORMS TO JEDEC MS-012, VARIATION AC, ISSUE C. B) ALL DIMENSIONS ARE IN MILLIMETERS.
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LAND PATTERN RECOMMENDATION TOP VIEW FST3257 — Quad 2:1 Multiplexer / Demultiplexer Bus Switch Physical Dimensions END VIEW SIDE VIEW DETAIL A Figure 6. 16-Lead Quarter Size Outline Package (QSOP) JEDEC MO-137 0.150 Inch Wide Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice.
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5.00±0.10 4.55 5.90 4.45 7.35 0.65 4.4±0.1 1.45 5.00 0.11 FST3257 — Quad 2:1 Multiplexer / Demultiplexer Bus Switch Physical Dimensions 12° MTC16rev4 Figure 7. 16-Lead Thin Shrink Small Outline Package (TSSOP) MO-153, 4.4mm Wide Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice.
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FST3257 — Quad 2:1 Multiplexer / Demultiplexer Bus Switch © 1997 Fairchild Semiconductor Corporation FST3257 • Rev. 1.0.3 www.fairchildsemi.