Datasheet

ManualsBrandsFAIRCHILD SEMICONDUCTOR ManualsLogic ICsLogic IC - Multiplexer, demux FET multiplexer/demultiplexer Single supply TSSOP 16

September 1997

Revised December 1999

FST3253 Dual 4:1 Multiplexer/Demultiplexer Bus Switch

FST3253

Dual 4:1 Multiplexer/Demultiplexer Bus Switch

General Description

The Fairchild Switch FST3253 is a dual 4:1 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, S

and S

connect 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.

Features

■ 4Ω switch connection between two ports.

■ Minimal propagation delay through the switch.

■ Low l

■ Zero bounce in flow-through mode.

■ Control inputs compatible with TTL level.

Ordering Code:

Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.

Logic Diagram

Pin Descriptions

Connection Diagram

Truth Table

Order Number Package Number Package Description

FST3253M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow

FST3253QSC MQA16 16-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150 Wide

FST3253MTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

Pin Name Description

, OE

Bus Switch Enables

, S

Select Inputs

ABus A

, B

Bus B

Function

X X H X Disconnect 1A

X X X H Disconnect 2A

LLLL A = B

LHLL A = B

HLLL A = B

HHL L A = B

Summary of content (5 pages)

PAGE 1
Revised December 1999 FST3253 Dual 4:1 Multiplexer/Demultiplexer Bus Switch General Description Features The Fairchild Switch FST3253 is a dual 4:1 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. ■ 4Ω switch connection between two ports. When OE is LOW, S0 and S1 connect the A Port to the selected B Port output.
PAGE 2
FST3253 Absolute Maximum Ratings(Note 1) Supply Voltage (VCC ) Recommended Operating Conditions (Note 3) −0.5V to +7.0V DC Switch Voltage (VS) −0.5V to +7.0V Power Supply Operating (VCC) DC Input Voltage (VIN)(Note 2) −0.5V to +7.0V Input Voltage (VIN) 0V to 5.5V 0V to 5.5V DC Input Diode Current (lIK) VIN<0V −50mA Output Voltage (VOUT) DC Output (IOUT ) Sink Current 128mA Input Rise and Fall Time (tr, tf) +/− 100mA DC VCC/GND Current (ICC/IGND) Storage Temperature Range (TSTG) 4.0V to 5.
PAGE 3
TA = −40 °C to +85 °C CL = 50pF, RU = RD = 500Ω Symbol Parameter VCC = 4.5 – 5.5V Min tPHL,tPLH tPZH, tPZL tPHZ, tPLZ Prop Delay Bus to Bus (Note 6) Max VCC = 4.0V Min Units Conditions Figure No. Max 0.25 0.25 Prop Delay, Select to Bus A 1.0 5.3 6.3 Output Enable Time, Select to Bus B 1.0 5.3 6.0 Output Enable Time, IOE to Bus A, B 1.0 5.3 6.2 Output Disable Time., Select to Bus B 1.0 5.8 6.2 Output Disable Time, IOE to Bus A, B 1.0 5.5 6.
PAGE 4
FST3253 Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow Package Number M16A 16-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150 Wide Package Number MQA16 www.fairchildsemi.
PAGE 5
FST3253 Dual 4:1 Multiplexer/Demultiplexer Bus Switch Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Package Number MTC16 Technology Description The Fairchild Switch family derives from and embodies Fairchild’s proven switch technology used for several years in its 74LVX3L384 (FST3384) bus switch product.