Fairchild FST32253 service manual

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FST32253
Dual 4:1 Multiplexer/Demultiplexer Bus Switch

with 25

FST32253 Dual 4:1 Multiplexer/Demultiplexer Bus Switch with 25

August 2001
Revised September 2001

Ω Series Resistor in Outputs

General Description

The Fairchild Switch F ST32253 is a dual 4:1 high-spe ed
CMOS TTL-compatible multiplexer/demultiplexer bus
switch. The low On Resistance of t he switch allows inputs
to be connected to outputs without adding propagation
delay or generating additional ground bounce noise.

When OE
selected B Port output. When OE

OPEN and a high-impedance sta te exist s between the two
ports.

The FST32253 has an equivalent 25
reduce signal-reflection noise, eliminating the need for
external terminating resistors.

is LOW, S0 and S1 connect the A Port to the

is HIGH, the switch is

Ω series resistor to

Features

■ 25Ω switch connection between two ports

■ Minimal propagation delay through the switch

■ Low l

CC

■ Zero bounce in flow-through mode

■ Control inputs compatible with TTL level

Ordering Code:

Order Number Package Number Package Description

FST32253M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
FST32253QSC MQA16 16-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150" Wide
FST32253MTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

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

Logic Diagram

Connection Diagram

Ω

Series Resistor in Outputs

Truth Table

S

S0OE1OE

Pin Descriptions

Pin Name Description

OE

, OE

1

2

S

, S

0

1

ABus A

, B2, B3, B

B

1

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4

Bus Switch Enables

Select Inputs

Bus B

1

X X H X Disconnect 1A
X X X H Disconnect 2A
LLLL A
LHLL A = B
HLLL A = B
HHL L A = B

2

Function

= B

1
2
3
4

Absolute Maximum Ratings(Note 1) Recommended Operating

Supply Voltage (VCC) −0.5V to +7.0V
DC Switch Voltage (V

FST32253

DC Input Voltage (V
DC Input Diode Current (l
DC Output (I
DC V

OUT

/GND Current (ICC/I

CC

Storage Temperature Range (T

) −0.5V to +7.0V

S

)(Note 2) −0.5V to +7.0V

IN

) V

< 0V −50 mA

IK

IN

) Sink Current 128 mA

) +/− 100 mA

GND

) −65°C to +150 °C

STG

Conditions

Power Supply Operating (V
Input Voltage (V
Output Voltage (V
Input Rise and Fall Time (t

Switch Control Input 0 ns/V to 5 ns/V
Switch I/O 0 ns/V to DC

Free Air Operating Temperature (T

Note 1: The Absolute Maximum Ratings are those values beyond which
the safety of the d evice cannot be guaranteed. The device sh ould not be
operated at these limit s. The parametric values defin ed in the Electrical
Characteristics tables are not guaranteed at the absolute maximum rating.
The Recommende d Opera ting Condit ions table s will de fine the co nditions
for actual device operation.

Note 2: The input and output ne gative vo ltage ra tings may be excee ded if
the input and output diode current ratings are observed.

Note 3: Unused control inputs must be held HIGH or LOW. They may not
float.

(Note 3)

CC)

)0V to 5.5V

IN

)0V to 5.5V

OUT

, tf)

r

) −40 °C to −85 °C

A

DC Electrical Characteristics

V

Symbol Parameter

V

IK

V

IH

V

IL

I

I

I

OZ

R

ON

I

CC

∆ I

CC

Note 4: Typi c al values are at VCC = 5.0V and TA = +25°C
Note 5: Measured by the volta ge drop between A an d B pins at the indicated c urrent through the switch. On Resistance is determined by the lower of the

voltages on the two (A or B) pins.

Clamp Diode Voltage 4 .5 −1.2 V IIN = −18 mA
High Level Input Voltage 4.0–5.5 2.0 V

Low Level Input Voltage 4.0–5.5 0.8 V
Input Leakage Current 5.5 ±1.0 µA0 ≤ VIN ≤ 5.5V

OFF-STATE Leakage Current 5.5 ±1.0 µA0 ≤ A, B ≤ V
Switch On Resistance 4.5 20 26 38 Ω VIN = 0V, IIN = 64 mA
(Note 5) 4.5 20 27 40 Ω V

Quiescent Supply Current 5.5 3 µAVIN = VCC or GND, I
Increase in I

per Input 5.5 2.5 mA One Input at 3.4V

CC

CC

(V)

010µAVIN = 5.5V

4.5202848Ω VIN = 2.4V, IIN = 15 mA

4.0203048Ω V

TA = −40 °C to +85 °C

Min Typ

(Note 4)

Units Conditions

Max

Other Inputs at V

CC

= 0V, IIN = 30 mA

IN

= 2.4V, IIN = 15 mA

IN

or GND

CC

OUT

4.0V to 5.5V

= 0

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