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FSTU3384WM

P1-P3P4-P5
© 2000 Fairchild Semiconductor Corporation DS500195 www.fairchildsemi.com
May 1999
Revised
October 2006
FSTU3384 10-Bit Bus Switch with
−
2V Undershoot Protection
FSTU3384
10-Bit Bus Switch with
−2V Undershoot Protection
General Description
The Fairchild Switch FSTU3384 provides 10 bits 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 generating addi-
tional ground bounce noise. Both the A Ports and the B
Ports have “undershoot hardened” circuit protection to sup-
port an extended input range to 2.0V below ground. Fair-
child’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 organized as two 5-bit switches with
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 available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Diagram
Pin Descriptions
Connection Diagram
Truth Table
UHC® is a registered trademark of Fairchild Semiconductor Corporation.
Order Number Package Number Package Description
FSTU3384WM M24B 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 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
1
, OE
2
Bus Switch Enable
A
0
–A
9
Bus A
B
0
–B
9
Bus B
OE
1
OE
2
B
0
–B
4
B
5
–B
9
Function
LLA
0
–A
4
A
5
–A
9
Connect
LHA
0
–A
4
HIGH-Z State Connect
H L HIGH-Z State A
5
–A
9
Connect
H H HIGH-Z State HIGH-Z State Disconnect
www.fairchildsemi.com 2
FSTU3384
Absolute Maximum Ratings(Note 1) Recommended Operating
Conditions
(Note 3)
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” table 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.
Note 3: Unused control inputs must be held HIGH or LOW. They may not
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, T
A
= 25°C.
Supply Voltage (V
CC
) −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
) V
IN
<0V −50 mA
DC Output (I
OUT
) Sink Current 128 mA
DC V
CC
/GND Current (I
CC
/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
, t
f
)
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 ≤ V
IN
≤ 5.5V
I
OZ
OFF-STATE Leakage Current 5.5 ±1.0 µA0 ≤ A, B ≤ V
CC
, V
IN
= V
IH
R
ON
Switch On Resistance 4.5 4 7 Ω V
S
= 0V, I
IN
= 64 mA
(Note 4) 4.5 4 7 Ω V
S
= 0V, I
IN
= 30 mA
4.5 8 15 Ω V
S
= 2.4V, I
IN
= 15 mA
4.0 11 20 Ω V
S
= 2.4V, I
IN
= 15 mA
I
CC
Quiescent Supply Current 5.5 3 µAV
S
= V
CC
or GND, I
OUT
= 0
∆ I
CC
Increase in I
CC
per Input 5.5 2.5 mA OE input at 3.4V
Other inputs at V
CC
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 µAI
IN
= − 20 mA, OE = 5.5V, V
OUT
≥ V
IH
V
IKU
Voltage Undershoot 5.5 −2.0 V 0.0 mA ≥ I
IN
≥ − 50 mA, OE = 5.5V
3 www.fairchildsemi.com
FSTU3384
AC Electrical Characteristics
Note 6: This parameter is guaranteed by design but not tested. The bus switch contributes no propagation delay other than the RC delay of the typical On
resistance of the switch and the 50pF load capacitance, when driven by an ideal voltage the source (zero output impedance).
Capacitance (Note 7)
Note 7: Capacitance is characterized but not tested.
AC Loading and Waveforms
Note: Input driven by 50 Ω source terminated in 50 Ω, RU = RD = 500 Ω
Note: C
L
includes load and stray capacitance, C
L
= 50 pF
Note: Input PRR = 1.0 MHz, t
W
= 500 ns
FIGURE 1. AC Test Circuit
FIGURE 2. AC Waveforms
Symbol Parameter
T
A
= −40°C to +85°C
C
L
= 50 pF, RU = RD = 500Ω
Units Conditions
Figure
No.
V
CC
= 4.5 − 5.5V V
CC
= 4.0V
Min Max Min Max
t
PHL
, t
PLH
Prop Delay Bus to Bus (Note 6) 0.25 0.25 ns V
I
= OPEN Figures
1, 2
t
PZH
, t
PZL
Output Enable Time
1.0 5.7 6.2 ns
V
I
= 7V for t
PZL Figures
1, 2
OE
1
, OE
2
to A
n
, B
n
V
I
= OPEN for t
PZH
t
PHZ
, t
PLZ
Output Disable Time
1.5 5.2 5.5 ns
V
I
= 7V for t
PLZ Figures
1, 2
OE
1
, OE
2
to A
n
, B
n
V
I
= OPEN for t
PHZ
Symbol Parameter Typ Max Units Conditions
C
IN
Control Input Capacitance 3 pF V
CC
= 5.0V
C
I/O
(OFF) Input/Output Capacitance 5 pF V
CC
, OE = 5.0V
P1-P3P4-P5

FSTU3384WM

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