ETC FSTU3384WMX

Revised December 2000
FSTU3384
10-Bit Bus Switch with −2V Undershoot Protection
General Description
Features
The Fairchild Switch FSTU3384 provides 10 bits of highspeed CMOS TTL-compatible bus switches. The low on
resistance of the switch allows inputs to be connected to
outputs without adding propagation delay generating additional ground bounce noise. Both the A Ports and the B
Ports have “undershoot hardened” circuit protection to support an extended input range to 2.0V below 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 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.
■ 4Ω switch connection between two ports
■ Undershoot Hardened to -2.0V.
■ Minimal propagation delay through the switch
■ Low lCC.
■ Zero ground bounce in flow-through mode
■ Control inputs compatible with TTL level
■ See Applications Note AN-5008 for details.
Ordering Code:
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
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Diagram
Connection Diagram
Truth Table
Pin Descriptions
Pin Names
Description
OE1, OE2
Bus Switch Enable
A0–A9
Bus A
B0–B9
Bus B
OE1
OE2
L
L
A0–A4
B0–B4
A5–A9
B5–B9
L
H
A0–A4
HIGH-Z State
H
L
HIGH-Z State A5–A9
H
H
HIGH-Z State HIGH-Z State
Function
Connect
Connect
Connect
Disconnect
UHC is a trademark of Fairchild Semiconductor Corporation.
© 2000 Fairchild Semiconductor Corporation
DS500195
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FSTU3384 10-Bit Bus Switch with −2V Undershoot Protection
May 1999
FSTU3384
Absolute Maximum Ratings(Note 1)
Recommended Operating
Conditions (Note 3)
Supply Voltage (VCC )
−0.5V to +7.0V
DC Switch Voltage (VS)
−2.0V to +7.0V
Power Supply Operating (VCC)
DC Input Voltage (VIN) (Note 2)
−0.5V to +7.0V
Input Voltage (VIN)
0V to 5.5V
0V to 5.5V
DC Input Diode Current (IIK) VIN<0V
−50 mA
Output Voltage (VOUT)
DC Output (IOUT ) Sink Current
128 mA
Input Rise and Fall Time (tr, tf)
+/− 100mA
DC VCC/GND Current (ICC/IGND)
Storage Temperature Range (TSTG)
4.0V to 5.5V
Switch Control Input
−65°C to +150 °C
0nS/V to 5nS/V
Switch I/O
0nS/V to DC
−40°C to +85°C
Free Air Operating Temperature (TA)
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
Symbol
Parameter
VCC
(V)
TA = −40°C to +85°C
Min
Typ
(Note 5)
Max
−1.2
Units
Condition
IIN = − 18 mA
VIK
Clamp Diode Voltage
VIH
HIGH Level Input Voltage
4.0-5.5
VIL
LOW Level Input Voltage
4.0-5.5
0.8
V
II
Input Leakage Current
5.5
±1.0
µA
IOZ
OFF-STATE Leakage Current
5.5
±1.0
µA
0 ≤ A, B ≤ VCC, VIN = VIH
RON
Switch On Resistance
4.5
7
Ω
VS = 0V, IIN = 64 mA
(Note 4)
4.5
2.0
V
V
4
0 ≤ VIN ≤ 5.5V
4.5
4
7
Ω
VS = 0V, IIN = 30 mA
4.5
8
15
Ω
VS = 2.4V, IIN = 15 mA
4.0
11
20
Ω
VS = 2.4V, IIN = 15 mA
ICC
Quiescent Supply Current
5.5
3
µA
VS = VCC or GND, IOUT = 0
∆ ICC
Increase in ICC per Input
5.5
2.5
mA
OE input at 3.4V
Other inputs at VCC or GND
IBIAS
Bias Pin Leakage Current
5.5
±1.0
µA
OE = 0V, B = 0V, BiasV = 5.5V
IOZU
Switch Undershoot Current
5.5
100
µA
IIN= − 20 mA, OE = 5.5V, VOUT ≥ VIH
VIKU
Voltage Undershoot
5.5
−2.0
V
0.0 mA ≥ IIN ≥ − 50 mA, OE = 5.5V
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 VCC = 5.0V, TA = 25°C.
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TA = −40°C to +85°C
CL = 50 pF, RU = RD = 500Ω
Symbol
Parameter
VCC = 4.5 − 5.5V
Min
tPHL, tPLH
tPZH, tPZL
tPHZ, tPLZ
Max
Prop Delay Bus to Bus (Note 6)
Output Enable Time
OE1, OE2 to An, Bn
Output Disable Time
OE1, OE2 to An, Bn
VCC = 4.0V
Min
Units
Conditions
Figure
No.
Max
0.25
0.25
ns
1.0
5.7
6.2
ns
1.5
5.2
5.5
ns
VI = OPEN
Figures
1, 2
VI = 7V for tPZL
VI = OPEN for tPZH
VI = 7V for tPLZ
VI = OPEN for tPHZ
Figures
1, 2
Figures
1, 2
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
Symbol
(Note 7)
Units
Conditions
CIN
Control Input Capacitance
Parameter
Typ
3
Max
pF
VCC = 5.0V
CI/O (OFF)
Input/Output Capacitance
5
pF
VCC, OE = 5.0V
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, CL= 50 pF
Note: Input PRR = 1.0 MHz, tW = 500 ns
FIGURE 1. AC Test Circuit
FIGURE 2. AC Waveforms
3
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FSTU3384
AC Electrical Characteristics
FSTU3384
Physical Dimensions inches (millimeters) unless otherwise noted
24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
Package Number M24B
24-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150 Wide
Package Number MQA24
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4
FSTU3384 10-Bit Bus Switch with −2V Undershoot Protection
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
24-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Package Number MTC24
Technology Description
The Fairchild Switch family derives from and embodies Fairchild’s proven switch technology used for several years in its
74LVX3L384 (FST3384) bus switch product.
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
2. A critical component in any component of a life support
device or system whose failure to perform can be reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the
user.
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