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FST3383QSC

P1-P3P4-P5
December 1993
Revised May 1999
FST3383 10-Bit Low Power Bus-Exchange Switch
© 1999 Fairchild Semiconductor Corporation DS011652.prf www.fairchildsemi.com
FST3383
10-Bit Low Power Bus-Exchange Switch
General Description
The FST3383 provides two sets of high-speed CMOS TTL-
compatible bus switches. The low on resistance of the
switch allows inputs to be connected to outputs without
adding propagation delay or generating additional ground
bounce noise. The device operates as a 10-bit bus switch
or a 5-bit bus exchanger. The bus exchange (BX) signal
provides nibble swapping of the AB and CD pairs of sig-
nals. This exchange configuration allows byte swapping of
buses in systems. It can also be used as a quad 2-to-1
multiplexer and to create low delay barrel shifters. The bus
enable (BE
) signal turns the switches ON.
Features
■ 5Ω switch connection between two ports
■ Zero propagation delay
■ Ultra low power with 0.2 µA typical I
CC
■ Zero ground bounce in flow-through mode
■ Control inputs compatible with TTL level
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Diagram
Pin Descriptions
Connection Diagram
Truth Table
Order Number Package Number Package Description
FST3383WM M24B 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
FST3383QSC MQA24 24-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150 Wide
FST3383MTC MTC24 24-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Pin Names Description
BE
Bus Switch Enable
BX Bus Exchange
A
0
–A
4
, B
0
–B
4
Buses A, B
C
0
–C
4
, D
0
–D
4
Buses C, D
BE BX
A
0
–A
4
B
0
–B
4
Function
H X High-Z State High-Z State Disconnect
LLC
0
–C
4
D
0
– D
4
Connect
LHD
0
–D
4
C
0
–C
4
Exchange
www.fairchildsemi.com 2
FST3383
Absolute Maximum Ratings(Note 1) Recommended Operating
Conditions
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 ratings.
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.
DC Electrical Characteristics
Note 3: All typical values are at V
CC
= 5.0V, T
A
= 25°C.
Note 4: Measured by voltage drop between A and B pin at indicated current through the switch. On resistance is determined by the lower of the voltages on
the two (A or B) pins.
Note 5: Per TTL driven input (V
IN
= 3.15V, control inputs only). A and B pins do not contribute to I
CC
.
Supply Voltage (V
CC
) −0.5V to +7.0V
DC Switch Voltage (V
S
) −0.5V to +7.0V
DC Input Voltage (V
I
) (Note 2) −0.5V to +7.0V
DC Input Diode Current (I
IN
)
with V
I
< 0
−20 mA
DC Output (I
O
) Sink Current 120 mA
Storage Temperature Range (T
STG
) −65°C to +150°C
Power Dissipation 0.5W
Supply Voltage (V
CC
) 4.0V to 5.5V
Free Air Operating Temperature (T
A
) −40°C to +85°C
Symbol Parameter
V
CC
(V)
T
A
= −40°C to +85°C
Units Conditions
Min Typ Max
(Note 3)
V
IK
Maximum Clamp Diode Voltage 4.75 −1.2 V I
IN
= −18 mA
V
IH
Minimum High Level Input Voltage 4.75–5.25 2.0 V
V
IL
Maximum Low Level Input Voltage 4.75–5.25 0.8 V
I
IN
Maximum Input 0 10 µA0 ≤ V
IN
≤ 5.25V
Leakage Current 5.25 ±1
I
OZ
Maximum 3-STATE I/O Leakage 5.25 ±10 µA0 ≤ A, B ≤ V
CC
I
OS
Short Circuit Current 4.75 100 mA V
I
(A), V
I
(B) = 0V, V
I
(B), V
I
(A) = 4.75V
R
ON
Switch On Resistance (Note 4) 4.75 5 7 Ω V
I
= 0V, I
ON
= 30 mA
10 15 Ω V
I
= 2.4V, I
ON
= 15 mA
I
CC
Maximum Quiescent Supply Current 5.25 0.2 10 µAV
I
= V
CC
, GND, I
O
= 0
∆I
CC
Increase in I
CC
per Input (Note 5) 5.25 2.5 mA V
IN
= 3.15V, I
O
= 0, Per Control Input
3 www.fairchildsemi.com
FST3383
AC Electrical Characteristics
Note 6: All typical values are at V
CC
= 5.0V, T
A
= 25°C.
Note 7: This parameter is guaranteed by design but not tested. The bus switch contributes no propagation delay other than the RC delay of the On resis-
tance of the switch and the load capacitance. The time constant for the switch and alone is of the order of 0.25 ns for 50 pF load. Since this time constant is
much smaller than the rise/fall times of typical driving signals, it adds very little propagation delay to the system. Propagation delay of the bus switch when
used in a system is determined by the driving circuit on the driving side of the switch and its interaction with the load on the driven side.
Capacitance (Note 8)
Note 8: Capacitance is characterized but not tested.
On-Resistance (R
ON
) vs Input Voltage
(V
CC
= 5.0V)
Symbol Parameter
V
CC
(V)
T
A
= −40°C to +85°C, C
L
= 50 pF
Units
Min Typ Max
(Note 6)
t
PLH
, Data Propagation Delay 4.75 0.25 ns
t
PHL
A
n
to C
n
, D
n
or B
n
to D
n
, C
n
(Note 7)
t
PLH
, Switch Exchange Time 4.75 1.5 6.5 ns
t
PHL
BX to A
n
, B
n
, C
n
, D
n
t
PZL
, Switch Enable Time 4.75 1.5 6.5 ns
t
PZH
BE to A
n
, B
n
, C
n
or D
n
t
PLZ
, Switch Disable Time 4.75 1.5 5.5 ns
t
PHZ
BE to A
n
, B
n
, C
n
, or D
n
Symbol Parameter Typ Max Units Conditions
C
IN
Control Input Capacitance 4 6 pF V
CC
= 5.0V
C
I/O
(OFF) Input/Output Capacitance 9 13 pF V
CC
= 5.0V
P1-P3P4-P5

FST3383QSC

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Manufacturer:
ON Semiconductor / Fairchild
Description:
Digital Bus Switch ICs 10-Bit Bus Ex Switch
Lifecycle:
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