Fairchild FST3384 service manual
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FST3384
10-Bit Low Power Bus Switch
FST3384 10-Bit Low Power Bus Switch
September 1997
Revised December 1999
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 separa te bus enable (OE
nals. When OE
nected to Port B. When OE
and a high-impedance state exists between the two ports.
is LOW, the switch is ON and Port A is con-
is HIGH, the switch is OPEN
) sig-
Features
■ 4Ω switch connection between two ports
■ Minimal propagation delay through the switch
■ Ultra low power with < 0.1 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
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
Devices also availab le in Tape and Reel. Specify by appending the suffix letter “X” to the o rdering code.
Logic Diagram
Connection Diagram
Pin Descriptions
Pin Names Description
OE
A, OEB Bus Switch Enable
A
0–A9
B
0–B9
© 1999 Fairchild Semiconductor Corporation DS500046 www.fairchildsemi.com
Bus A
Bus B
Truth Table
OEAOEBB0–B
LLA
LHA
H L HIGH-Z State A
H H HIGH-Z State HIGH-Z State Disconnect
4
0–A4
0–A4
B5–B
A5–A
9
HIGH-Z State Connect
5–A9
Function
9
Connect
Connect
Print form created on December 13, 1999 4:03
Absolute Maximum Ratings(Note 1) Recommended Operating
Supply Voltage (VCC) −0.5V to +7.0V
DC Switch Voltage (V
FST3384
DC Input Voltage (V
DC Input Diode Current (I
DC Output (I
DC V
OUT
/GND Current (ICC/I
CC
Storage Temperature Range (T
) −0.5V to +7.0V
S
) (Note 2) −0.5V to +7.0V
IN
) VIN<0V −50 mA
IK
) Sink Current 128 mA
) +/− 100mA
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 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.
(Note 3)
) 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
= −40°C to +85°C
T
V
Symbol Parameter
V
IK
V
IH
V
IL
I
I
I
OZ
R
ON
I
CC
∆ I
CC
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.
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
OFF-STATE Leakage Current 5.5 ±1.0 µA0 ≤ A, B ≤ V
Switch On Resistance 4.5 4 7 Ω VIN = 0V, IIN = 64mA
(Note 5) 4.5 4 7 Ω V
Quiescent Supply Current 5.5 3 µAVIN = VCC or GND, I
Increase in ICC per Input 5.5 2.5 mA One input at 3.4V
CC
(V)
4.5 8 15 Ω V
4.0 11 20 Ω VIN = 2.4V, IIN = 15mA
Min
A
Typ
(Note 4)
Units Condition
Max
CC
= 0V, IIN = 30mA
IN
= 2.4V, IIN = 15mA
IN
Other inputs at VCC or GND
OUT
= 0
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