Fairchild Semiconductor FSTU3384WMX, FSTU3384WM, FSTU3384QSCX, FSTU3384QSC, FSTU3384MTCX Datasheet
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© 1999 Fairchild Semiconductor Corporation DS500195 www.fairchildsemi.com
May 1999
Revised December 1999
FSTU3384 10-Bit Bus Switch with
FSTU3384
10-Bit Bus Switch with
−2V Undershoot Hardened Circuit (UHC) Protection
General Description
The Fairchild Switc h FSTU3384 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 add ing propag ation del ay genera ting additional ground bounce nois e. Both the A Ports and the B
Ports are “undersh oot hardened ” with UHC pr otection to
support an extended input range to 2.0V belo w ground.
Fairchild’s integrated Undershoot Hardened Circuit, UHC
senses undershoot at the I/Os, and responds by preventing
voltage differentials from developing and turning on the
switch. The device is orga nized as two 5 -bit switches wi th
separate bus enable (OE
) signals. When OE is LOW, the
switch is ON and Port A is connected 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
■ Undershoot Hardened to -2.0V.
■ Minimal propagation delay through the switch
■ Low l
CC
.
■ Zero ground bounce in flow-through mode
■ Control inputs compatible with TTL level
■ See Applications Note AN-5008 for details.
Ordering Code:
Devices also availab le in Tape and Reel. Specify by appending the s uffix let te r “X” to the ordering code.
Logic Diagram
Pin Descriptions
Connection Diagram
Truth T able
UHC is a trademark of Fairchild Semiconductor Corporation.
Order Number Package Number Package Description
FSTU3384WM M24B 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MO-153 4.4mm Wide
FSTU3384QSC MQA24 24-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150” Wide
FSTU3384MTC 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
OEAOEB
B
0–B4
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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FSTU3384
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 in puts mus t be held HI GH o r LOW. Th ey ma y no t
float.
DC Electrical Characteristics
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: All typical values are at V
CC
= 5.0V, TA = 25°C.
Supply Voltage (VCC) −0.5V to +7.0V
DC Switch Voltage (V
S
) −2.0V 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 R ange (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 5)
Max
V
IK
Clamp Diode Voltage 4.5 −1.2 V I
IN
= − 18 mA
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 ≤ VCC, VIN = V
IH
R
ON
Switch On Resistance 4.5 4 7 Ω VS = 0V, IIN = 64 mA
(Note 4) 4.5 4 7 Ω V
S
= 0V, IIN = 30 mA
4.5 8 15 Ω V
S
= 2.4V, IIN = 15 mA
4.0 11 20 Ω VS = 2.4V, IIN = 15 mA
I
CC
Quiescent Supply Current 5.5 3 µAVS = VCC or GND, I
OUT
= 0
∆ I
CC
Increase in ICC per Input 5.5 2.5 mA OE input at 3.4V
Other inputs at VCC or GND
I
BIAS
Bias Pin Leakage Current 5.5 ±1.0 µAOE = 0V, B = 0V, BiasV = 5.5V
I
OZU
Switch Undershoot Current 5.5 100 µAIIN= − 20 mA, OE = 5.5V, V
OUT
≥ V
IH
V
IKU
Voltage Undershoot 5.5 −2.0 V 0.0 mA ≥ IIN ≥ − 50 mA, OE = 5.5V
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