Fairchild Semiconductor FST34170 Datasheet
October 2000
Revised December 2000
FST34170
17-Bit to 34-Bit Multiplexer/Demultiplexer Bus Switch
FST34170 17-Bit to 34-Bit Multiplexer/Demult iplexer Bus Switch
General Description
The Fairchild Swi tch FST34170 is a 17-bit to 34-bit hig hspeed CMOS TTL-compatible multiplexer/demultiplexer
bus switch. The low on resistance of the switch allows
inputs to be connect ed to out puts wit hout adding prop agation delay or generating additional ground bounce noise.
The device can be used in applications where two buses
need to be addresse d simultaneously. The FST34170 is
designed so that the A Port de multiplexe s into B
both.
Two select (SEL
trol.
, SEL2) inputs provide switch enabl e co n-
1
or B2 or
1
Features
■ Slower Output Enable times prevent signal disruption
■ 4
Ω 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.
■ See Applications Note AN-5008 for details
.
CC
Ordering Code:
Order Number Package Number Package Description
FST34170MTD MTD56 56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Devices also availab le in Tape and Reel. Specify by appending the suffix letter “X” to the o rdering code.
Logic Diagram
Connection Diagram
Truth Table
Inputs
SEL
1
LH x A = x B
HL x A = x B
LLx A = x B1 and x B
H H Switch Open
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SEL
2
Function
Pin Descriptions
1
2
2
Pin Name Description
SEL
, SEL
1
2
ABus A
, B
B
1
2
Select Inputs
Bus B
Absolute Maximum Ratings(Note 1) Recommended Operating
Supply Voltage (VCC) −0.5V to +7.0V
DC Switch Voltage (V
FST34170
DC Input Control Pin Voltage
) (Note 3) −0.5V to +7.0V
(V
IN
DC Input Diode Current (l
DC Output Current (I
/GND Current (ICC/I
DC V
CC
Storage Temperature Range (T
) (Note 2) −0.5V to +7.0V
S
) V
< 0V −50 mA
IK
IN
) 128 mA
OUT
) +/− 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 0nS/V to 5nS/V
Switch I/O 0nS/V to DC
Free Air Operating Temperature (T
Note 1: The “Absolute Maximum Ratings” are those values bey ond 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 “Recomme nded O perat ing Co ndition s” table will defin e the condition s
for actual device operation.
is the volt age observed/applied at either the A or B Ports a c ross
Note 2: V
S
the switch.
Note 3: 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 4: Unused control inputs m ust be held HIGH o r LOW. They may no t
float.
(Note 4)
) 4.0V to 5.5V
CC
)0V to 5.5V
IN
)0V to 5.5V
OUT
, tf)
r
) −40 °C to +85 °C
A
DC Electrical Characteristics
TA = −40 °C to +85 °C
Symbol Parameter
V
IK
V
IH
V
IL
I
I
I
OZH
I
OZH
R
ON
I
CC
∆ I
Note 5: Typi c al values are at VCC = 5.0V and TA = +25°C
Note 6: 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 = −18mA
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
, I
OFF-STATE Leakage Current 5.5 ±1.0 µA0 ≤ A, ≤ VCC, V
OZL
, I
OFF-STATE Leakage Current 5.5 ±1.0 µA0 ≤ B, ≤ VCC, V
OZL
Switch On Resistance 4.5 4 7 Ω VIN = 0V, IIN = 64 mA
(Note 6) 4.5 4 7 Ω V
Quiescent Supply Current 5.5 3 µAVIN = VCC or GND, I
Increase in I
CC
per Input 5.5 2.5 mA One input at 3.4V
CC
(V) (Note 5)
4.5 8 14 Ω VIN = 2.4V, IIN = 15 mA
4.0 11 20 Ω V
Min Typ Max
CC
010µAV
Units ConditionsV
= 5.5V
IN
= 0V, IIN = 30 mA
IN
= 2.4V, IIN = 15 mA
IN
Other inputs at V
CC
= 0
OUT
or GND
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