Fairchild Semiconductor FST3384WMX, FST3384WM, FST3384QSCX, FST3384QSC, FST3384MTCX Datasheet
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© 1999 Fairchild Semiconductor Corporation DS500046 www.fairchildsemi.com
September 1997
Revised December 1999
FST3384 10-Bit Low Power Bus Switch
Print form created on December 13, 1999 4:03
FST3384
10-Bit Low Power Bus Switch
General Description
The Fairchild Switch FST3384 provides 10 bits of highspeed CMOS TTL-compatible bus switches. The low on
resistance of the switch allows inp uts to be connected to
outputs without adding propagation delay or generating
additional ground bou nce noise. The device is organ ized
as two 5-bit switches with separate bu s enable (OE
) sig-
nals. When OE
is LOW, the switch is ON and Port A is con-
nected to Port B. When OE
is HIGH, the switch is OPEN
and a high-impedance state exists between the two ports.
Features
■ 4Ω switch connection between two ports
■ Minimal propagation delay through the switch
■ Ultra low power with < 0.1 µA typical I
CC
■ Zero ground bounce in flow-through mode
■ Control inputs compatible with TTL level
Ordering Code:
Devices also availab le in Tape and Reel. Specify by appending th e s uffix let t er “X” to the ordering code.
Logic Diagram
Pin Descriptions
Connection Diagram
Truth Table
Order Number Package Number Package Description
FST3384WM M24B 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
FST3384QSC MQA24 24-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150 Wide
FST3384MTC MTC24 24-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Pin Names Description
OE
A, OEB Bus Switch Enable
A
0–A9
Bus A
B
0–B9
Bus B
OEAOEBB0–B
4
B5–B
9
Function
LLA
0–A4
A5–A
9
Connect
LHA
0–A4
HIGH-Z State Connect
H L HIGH-Z State A
5–A9
Connect
H H HIGH-Z State HIGH-Z State Disconnect
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FST3384
Absolute Maximum Ratings(Note 1) Recommended Operating
Conditions
(Note 3)
Note 1: The “Absolute Maximum Ratings” are those values beyon d which
the safety of the dev ice cannot be guaranteed. T he device sh ould not be
operated at these limits. The paramet ric values defined in the “Electrical
Characteristics” table are not guaranteed at the absolute maximum ratings.
The “Recomme nded O peratin g Cond itions ” table will defin e the condition s
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.
DC Electrical Characteristics
Note 4: All typical values are at VCC = 5.0V, TA = 25°C.
Note 5: 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.
Supply Voltage (VCC) −0.5V to +7.0V
DC Switch Voltage (V
S
) −0.5V to +7.0V
DC Input Voltage (V
IN
) (Note 2) −0.5V to +7.0V
DC Input Diode Current (I
IK
) VIN<0V −50 mA
DC Output (I
OUT
) Sink Current 128 mA
DC V
CC
/GND Current (ICC/I
GND
) +/− 100mA
Storage Temperature Range (T
STG
) −65°C to +150°C
Power Supply Operating (V
CC
) 4.0V to 5.5V
Input Voltage (V
IN
)0V to 5.5V
Output Voltage (V
OUT
)0V to 5.5V
Input Rise and Fall Time (t
r
, tf)
Switch Control Input 0nS/V to 5nS/V
Switch I/O 0nS/V to DC
Free Air Operating Temperature (T
A
) −40°C to +85°C
Symbol Parameter
V
CC
(V)
T
A
= −40°C to +85°C
Units Condition
Min
Typ
(Note 4)
Max
V
IK
Clamp Diode Voltage 4.5 −1.2 V IIN= − 18mA
V
IH
HIGH Level Input Voltage 4.0-5.5 2.0 V
V
IL
LOW Level Input Voltage 4.0-5.5 0.8 V
I
I
Input Leakage Current 5.5 ±1.0 µA0 ≤ VIN ≤ 5.5V
I
OZ
OFF-STATE Leakage Current 5.5 ±1.0 µA0 ≤ A, B ≤ V
CC
R
ON
Switch On Resistance 4.5 4 7 Ω VIN = 0V, IIN = 64mA
(Note 5) 4.5 4 7 Ω V
IN
= 0V, IIN = 30mA
4.5 8 15 Ω V
IN
= 2.4V, IIN = 15mA
4.0 11 20 Ω VIN = 2.4V, IIN = 15mA
I
CC
Quiescent Supply Current 5.5 3 µAVIN = VCC or GND, I
OUT
= 0
∆ I
CC
Increase in ICC per Input 5.5 2.5 mA One input at 3.4V
Other inputs at VCC or GND
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