FSTU3257_06 [FAIRCHILD]
Quad 2:1 Multiplexer/Demultiplexer Bus Switch with 2V Undershoot Protection; 四路2 ： 1多路复用器/多路解复用器总线开关具有2V下冲保护
| 型号： | FSTU3257_06 |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | Quad 2:1 Multiplexer/Demultiplexer Bus Switch with 2V Undershoot Protection |
| 文件： | 总6页 (文件大小：200K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
August 1999
Revised October 2006
FSTU3257
Quad 2:1 Multiplexer/Demultiplexer Bus Switch with
ꢀ2V Undershoot Protection
General Description
Features
■ Undershoot hardened to 2V (A and B Ports)
The Fairchild Switch FSTU3257 is a quad 2:1 high-speed
CMOS TTL-compatible multiplexer/demultiplexer bus
switch. The low on resistance of the switch allows inputs to
be connected to outputs without adding propagation delay
or generating additional ground bounce noise.
■ Soft enable turn-on to minimize bus to bus charge
sharing during enable
■ 4 switch connection between two ports.
■ Minimal propagation delay through the switch.
When OE is LOW, the select pin connects the A Port to the
selected B Port output. The A and B Ports are “undershoot
hardened” with Undershoot Hardened Circuit (UHC® ) pro-
tection to support an extended range of 2.0V below
ground. Fairchild’s integrated UHC senses undershoot at
the I/O and responds by preventing voltage differentials
from developing and turning on the switch. When OE is
HIGH, the switch is OPEN and a high-impedance state
exists between the two ports.
■ Low lCC
.
■ Zero bounce in flow-through mode.
■ Control inputs compatible with TTL level.
■ See Applications Note AN-5008 for details
Ordering Code:
Order Number
FSTU3257M
Package Number
M16A
Package Description
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
16-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150" Wide
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
FSTU3257QSC
FSTU3257MTC
MQA16
MTC16
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Logic Diagram
Connection Diagram
Truth Table
Pin Descriptions
S
X
L
OE
H
Function
Pin Name
Description
Disconnect
OE
S
Bus Switch Enable
Select Input
Bus A
L
A
A
B1
B2
H
L
A
B1–B2
Bus B
UHC® is a registered trademark of Fairchild Semiconductor Corporation.
© 2005 Fairchild Semiconductor Corporation
DS500302
www.fairchildsemi.com
Absolute Maximum Ratings(Note 1)
Recommended Operating
Conditions (Note 4)
0.5V to 7.0V
Supply Voltage (VCC
)
DC Switch Voltage (VS) (Note 2)
2.0V to 7.0V Power Supply Operating (VCC
)
4.0V to 5.5V
0V to 5.5V
0V to 5.5V
DC Input Control Pin Voltage (VIN)(Note 3)
DC Input Diode Current (lIK) VIN 0V
0.5V to 7.0V Input Voltage (VIN
)
50mA
Output Voltage (VOUT
)
DC Output (IOUT
)
128mA Input Rise and Fall Time (tr, tf)
DC VCC/GND Current (ICC/IGND
)
/
100mA
Switch Control Input
Switch I/O
0nS/V to 5nS/V
0nS/V to DC
Storage Temperature Range (TSTG
ESD
)
65 C to 150 C
Free Air Operating Temperature (TA)
40 C to 85 C
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 tables are not guaranteed at the absolute maximum rating.
The Recommended Operating Conditions tables will define the conditions
for actual device operation.
Human Body Model
5kV
Note 2: V is the voltage observed/applied at either the A or B Ports across
S
the switch.
Note 3: The input and output negative voltage ratings may be exceeded if
the input and output diode current ratings are observed.
Note 4: Unused control inputs must be held HIGH or LOW. They may not
float.
DC Electrical Characteristics
V
T
40 C to 85
C
CC
A
Symbol
Parameter
Units
Conditions
Min
Typ
(Note 5)
Max
(V)
V
V
V
Clamp Diode Voltage
HIGH Level Input Voltage
LOW Level Input Voltage
Input Leakage Current
OFF-STATE Leakage Current
Switch On Resistance
(Note 6)
4.5
4.0–5.5
4.0–5.5
5.5
1.2
V
V
V
A
A
I
18mA
IK
IN
2.0
IH
IL
0.8
1.0
1.0
7
I
I
0
V
5.5V
I
IN
5.5
0
A, B
0V, I
IN
V
OZ
CC
R
4.5
4
4
V
V
V
V
V
64mA
30mA
ON
IN
IN
IN
IN
IN
4.5
7
0V, I
IN
4.5
8
15
20
3
2.4V, I
2.4V, I
15mA
15mA
IN
IN
4.0
11
I
Quiescent Supply Current
5.5
A
V
or GND, I
OUT
0
CC
CC
I
Increase in I per Input
CC
5.5
2.5
mA
One input at 3.4V
Other inputs at V or GND
CC
CC
V
Voltage Undershoot
5.5
2.0
V
0.0 mA
I
50 mA
IKU
IN
OE 5.5V
Note 5: Typical values are at V
5.0V and T
25 C
CC
A
Note 6: Measured by the voltage drop between A and B pins at the indicated current through the switch. On resistance is determined by the lower of the
voltages on the two (A or B) pins.
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2
AC Electrical Characteristics
T
40 C to 85 C,
50pF, RU RD 500
A
C
Figure
No.
L
Symbol
Parameter
Units
Conditions
V
4.5 – 5.5V
V
4.0V
CC
CC
Min
Max
0.25
30.0
30.0
Min
Max
0.25
35.0
35.0
t
t
,t
Prop Delay Bus to Bus (Note 7)
PHL PLH
Figures
2, 3
ns
ns
V
V
OPEN
I
Prop Delay, Select to Bus A
7.0
7.0
, t
Output Enable Time, Select to Bus B
7V for t
PZL
PZH PZL
I
Figures
2, 3
Output Enable Time, OE to Bus A, B
Output Disable Time, Select to Bus B
7.0
1.5
30.0
8.4
35.0
9.8
V
V
OPEN for t
I
PZH
t
, t
7V for t
PLZ
PHZ PLZ
I
Figures
2, 3
ns
Output Disable Time, Output Enable Time, OE to Bus A, B
1.5
8.8
9.8
V
OPEN for t
I
PHZ
Note 7: This parameter is guaranteed by design but is 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 8)
Symbol
Parameter
Typ
Max
Units
Conditions
5.0V
C
Control Pin Input Capacitance
3
pF
V
IN
CC
A Port
B Port
7.5
5.5
14
pF
pF
pF
C
C
Input/Output Capacitance
V
V
, OE 5.0V
I/O
CC
ON State
Input/Output Capacitance ON State (A or B Port)
5.0V Switch ON
I/O
CC
Note 8: T
25 C, f 1 MHz, Capacitance is characterized but not tested.
A
Undershoot Characteristic (Note 9)
Symbol
Parameter
Min
Typ
0.3
OH
Max
Units
Conditions
V
Output Voltage During Undershoot
2.5
V
V
Figure 1
OUTU
Note 9: This is intended to characterize the device’s protective capabilities by maintaining output signal integrity during an input transient voltage undershoot
event.
FIGURE 1.
Device Test Conditions
Transient
Input Voltage (V ) Waveform
Parameter
Value
Units
IN
V
See Waveform
100K
V
IN
R
- R
2
1
V
V
11.0
V
V
TRI
CC
5.5
3
www.fairchildsemi.com
AC Loading and Waveforms
Note: Input driven by 50 source terminated in 50
Note: C includes load and stray capacitance
L
Note: Input PRR 1.0 MHz, t
500 ns
W
FIGURE 2. AC Test Circuit
FIGURE 3. AC Waveforms
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4
Physical Dimensions inches (millimeters) unless otherwise noted
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
Package Number M16A
16-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150" Wide
Package Number MQA16
5
www.fairchildsemi.com
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Package Number MTC16
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:
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 rea-
sonably expected to result in a significant injury to the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
www.fairchildsemi.com
6
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