FST16233 16-Bit to 32-Bit Multiplexer/Demultiplexer Bus Switch
September 1997
Revised November 2000
FST16233
16-Bit to 32-Bit Multiplexer/Demultiplexer Bus Switch
General Description
The Fairchild Switch FST16233 is a 16-bit to 32-bit 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 propaga-
tion delay or generating additional ground bounce noise.
The device can be used in applications where two buses
need to be addressed simultaneously. The FST16233 can
be used as two 8-bit to 16-bit multiplexers or as one 16-bit
to 32-bit multiplexer.
Two select (S
1
, S
0
) and two test (TEST
0
, TEST
1
) inputs
provide switch enable and multiplexer select control.
The FST16233 is designed to prevent through-current
when switching buses.
Features
s
4
Ω
switch connection between two ports.
s
Minimal propagation delay through the switch.
s
Low l
CC
.
s
Zero bounce in flow-through mode.
s
Control inputs compatible with TTL level.
Ordering Code:
Order Number
FST16233MEA
FST16233MTD
Package Number
MS56A
MTD56
Package Description
56-Lead Shrink Small Outline Package (SSOP), JEDEC MO-118, 0.300 Wide
56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Diagram
© 2000 Fairchild Semiconductor Corporation
DS500055
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FST16233
Connection Diagram
Pin Descriptions
Pin Name
S
0
, S
1
TEST
0
, TEST
1
A
B
1
, B
2
Description
Select Inputs
Test Inputs
Bus A
Bus B
Truth Table
Inputs
S
L
H
X
TEST
L
L
H
Function
A
=
B
1
A
=
B
2
A
=
B
1
and A
=
B
2
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2
FST16233
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
CC
)
DC Switch Voltage (V
S
)
DC Input Voltage (V
IN
) (Note 2)
DC Input Diode Current (l
IK
) V
IN
<
0V
DC Output (I
OUT
) Sink Current
DC V
CC
/GND Current (I
CC
/I
GND
)
Storage Temperature Range (T
STG
)
−
0.5V to
+
7.0V
−
0.5V to
+
7.0V
−
0.5V to
+
7.0V
−
50mA
128mA
Recommended Operating
Conditions
(Note 3)
Power Supply Operating (V
CC
)
Input Voltage (V
IN
)
Output Voltage (V
OUT
)
Input Rise and Fall Time (t
r
, t
f
)
Switch Control Input
Switch I/O
Free Air Operating Temperature (T
A
)
0nS/V to 5nS/V
0nS/V to DC
4.0V to 5.5V
0V to 5.5V
0V to 5.5V
+
/
−
100mA
−
65
°
C to
+
150
°
C
−
40
°
C to
+
85
°
C
Note 1:
The “Absolute Maximum Ratings” are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum rating.
The “Recommended Operating Conditions” table will define the conditions
for actual device operation.
Note 2:
The input and output negative voltage ratings may be exceeded 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.
DC Electrical Characteristics
Symbol
V
IK
V
IH
V
IL
I
I
I
OFF
R
ON
Parameter
Clamp Diode Voltage
HIGH Level Input Voltage
LOW Level Input Voltage
Input Leakage Current
OFF-STATE Leakage Current
Switch On Resistance
(Note 5)
V
CC
(V)
4.5
4.0–5.5
4.0–5.5
5.5
0
5.5
4.5
4.5
4.5
4.0
I
CC
∆
I
CC
Quiescent Supply Current
Increase in I
CC
per Input
5.5
5.5
4
4
8
11
2.0
0.8
±1.0
10
±1.0
7
7
12
20
3
2.5
T
A
= −40 °C
to
+85 °C
Min
Typ
(Note 4)
Max
−1.2
Units
V
V
V
µA
µA
µA
Ω
Ω
Ω
Ω
µA
mA
0≤ V
IN
≤5.5V
V
IN
=
5.5V
0
≤A,
B
≤V
CC
V
IN
=
0V, I
IN
=
64mA
V
IN
=
0V, I
IN
=
30mA
V
IN
=
2.4V, I
IN
=
15mA
V
IN
=
2.4V, I
IN
=
15mA
V
IN
=
V
CC
or GND, I
OUT
=
0
One input at 3.4V
Other inputs at V
CC
or GND
Note 4:
Typical values are at V
CC
=
5.0V and T
A
= +25°C
Note 5:
Measured by the voltage drop between A and B pins at the indicated current through the switch. On resistance is determined by the lower of the
voltages on the two (A or B) pins.
Conditions
I
IN
= −18mA
3
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FST16233
AC Electrical Characteristics
T
A
= −40 °C
to
+85 °C,
Symbol
Parameter
C
L
=
50pF, RU= RD
=
500Ω
V
CC
=
4.5
−
5.5V
Min
t
PHL
, t
PLH
t
PHL
,t
PLH
t
PZH
, t
PZL
t
PHZ
, t
PLZ
A or B, to B or A (Note 6)
S to A
Output Enable Time,
S or TEST to B
Output Disable Time,
S or TEST to B
1.5
Max
0.25
6.1
V
CC
=
4.0V
Min
Max
0.25
6.8
ns
ns
V
I
=
OPEN
V
I
=
OPEN
V
I
=
7V for t
PZL
,
V
I
=
OPEN for t
PZH
V
I
=
7V for t
PLZ
,
V
I
=
OPEN for t
PHZ
Figures
1, 2
Figures
1, 2
Figures
1, 2
Figures
1, 2
Units
Conditions
Figure
No.
1.0
1.5
6.5
7.8
7.2
8.5
ns
ns
Note 6:
This parameter is guaranteed by design but is not tested. The bus switch contributes no propagation delay other than the RC delay of the typical On
resistance of the switch and the 50pF load capacitance, when driven by an ideal voltage source (zero output impedance).
Capacitance
Symbol
C
IN
C
I/O
(Note 7)
Parameter
Typ
4
6
Max
Units
pF
pF
Conditions
V
CC
=
5.0V
V
CC
=
5.0V, Switch OFF
Control pin Input Capacitance
Input/Output Capacitance
Note 7:
T
A
= +25°C,
f
=
1 MHz, Capacitance is characterized but not tested.
AC Loading and Waveforms
Note:
Input driven by 50
Ω
source terminated in 50
Ω
Note:
C
L
includes load and stray capacitance
Note:
Input PRR
=
1.0 MHz, t
W
=
500 ns
FIGURE 1. AC Test Circuit
FIGURE 2. AC Waveforms
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4
FST16233
Physical Dimensions
inches (millimeters) unless otherwise noted
56-Lead Shrink Small Outline Package (SSOP), JEDEC MO-118, 0.300 Wide
Package Number MS56A
5
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