Fairchild FST3383 service manual
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FST3383
10-Bit Low Power Bus-Exchange Switch
FST3383 10-Bit Low Power Bus-Exchange Switch
December 1993
Revised May 1999
General Description
The FST3383 provides two sets of high-speed CMOS TTLcompatible bus switches. The low on resistance of the
switch allows inputs to be connected to outputs without
adding propagatio n delay or generating additi onal ground
bounce noise. The device operates as a 10 -bit bus switch
or a 5-bit bus exchange r. The bus exchange (BX ) signal
provides nibble swapping of the AB and CD pairs of signals. This exchange config uration allows byte swappin g of
buses in systems. It can al so be used as a quad 2-to-1
multiplexer and to create low delay barr el 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
■ Zero ground bounce in flow-through mode
■ Control inputs compatible with TTL level
CC
Ordering Code:
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
Devices also availab le in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Diagram
Connection Diagram
Pin Descriptions
Pin Names Description
BE
BX Bus Exchange
, B0–B
A
0–A4
C
0–C4
© 1999 Fairchild Semiconductor Corporation DS011652.prf www.fairchildsemi.com
, D0–D
4
4
Bus Switch Enable
Buses A, B
Buses C, D
Truth Table
BE BX
H X High-Z State High-Z State Disconnect
LLC
LHD
A
0–C4
0–D4
0–A4
B0–B
D0– D
C0–C
4
4
4
Function
Connect
Exchange
Absolute Maximum Ratings(Note 1) Recommended Operating
Supply Voltage (VCC) −0.5V to +7.0V
DC Switch Voltage (V
FST3383
DC Input Voltage (V
DC Input Diode Current (I
< 0
with V
I
−20 mA
DC Output (I
O
Storage Temperature Range (T
) −0.5V to +7.0V
S
) (Note 2) −0.5V to +7.0V
I
)
IN
) Sink Current 120 mA
) −65°C to +150°C
STG
Power Dissipation 0.5W
Conditions
Supply Voltage (V
Free Air Operating Temperature (T
Note 1: The “Absolute Maximum Ratin gs” are those v alues beyon d which
the safety of the dev ice cannot be guaranteed. T he device sh ould not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommend ed O peratin g Cond itions” t able w ill defin e the c ondit ions
for actual device operation.
Note 2: The input and output negative volt age ratin gs may be exceede d if
the input and output diode current ratings are observed.
) 4.0V to 5.5V
CC
) −40°C to +85°C
A
DC Electrical Characteristics
V
Symbol Parameter
V
IK
V
IH
V
IL
I
IN
I
OZ
I
OS
R
ON
I
CC
∆I
CC
Note 3: All typical va lues are at VCC = 5.0V, TA = 25°C.
Note 4: Measured by v oltage drop between A and B pin at indic at ed current through t he switch. On resistanc e is determined by the lower of the voltages on
the two (A or B) pins.
Note 5: Per TTL driven input (VIN = 3.15V, control inputs only). A and B pins do not contribute t o ICC.
Maximum Clamp Diode Voltage 4.75 −1.2 V IIN = −18 mA
Minimum High Level Input Voltage 4.75–5.25 2.0 V
Maximum Low Level Input Voltage 4.75–5.25 0.8 V
Maximum Input 0 10 µA0 ≤ VIN ≤ 5.25V
Leakage Current 5.25 ±1
Maximum 3-STATE I/O Leakage 5.25 ±10 µA0 ≤ A, B ≤ V
Short Circuit Current 4.75 100 mA VI(A), VI(B) = 0V, VI(B), VI(A) = 4.75V
Switch On Resistance (Note 4) 4.75 5 7 Ω VI = 0V, ION = 30 mA
Maximum Quiescent Supply Current 5.25 0.2 10 µAVI = VCC, GND, IO = 0
Increase in ICC per Input (Note 5) 5.25 2.5 mA VIN = 3.15V, IO = 0, Per Control Input
(V)
CC
TA = −40°C to +85°C
Min Typ Max
(Note 3)
10 15 Ω VI = 2.4V, ION = 15 mA
Units Conditions
CC
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