FST34170MTDX [FAIRCHILD]
Bus Exchanger ; 总线交换器\n
| 型号： | FST34170MTDX |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | Bus Exchanger
|
| 文件： | 总4页 (文件大小：138K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
October 2000
Revised December 2000
FST34170
17-Bit to 34-Bit Multiplexer/Demultiplexer Bus Switch
General Description
Features
The Fairchild Switch FST34170 is a 17-bit to 34-bit 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 propaga-
tion delay or generating additional ground bounce noise.
■ Slower Output Enable times prevent signal disruption
■ 4Ω switch connection between two ports.
■ Minimal propagation delay through the switch.
■ Low lCC
.
■ Zero bounce in flow-through mode.
The device can be used in applications where two buses
need to be addressed simultaneously. The FST34170 is
designed so that the A Port demultiplexes into B1 or B2 or
■ Control inputs compatible with TTL level.
■ See Applications Note AN-5008 for details
both.
Two select (SEL1, SEL2) inputs provide switch enable con-
trol.
Ordering Code:
Order Number
Package Number
Package Description
FST34170MTD
MTD56
56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm 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
Inputs
Function
SEL1
SEL2
Pin Descriptions
L
H
L
H
L
x A = x B1
x A = x B2
Pin Name
SEL1, SEL2
A
Description
Select Inputs
Bus A
L
x A = x B1 and x B2
Switch Open
H
H
B1, B2
Bus B
UHC is a trademark of Fairchild Semiconductor Corporation.
© 2000 Fairchild Semiconductor Corporation
DS500450
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Absolute Maximum Ratings(Note 1)
Recommended Operating
Conditions (Note 4)
Supply Voltage (VCC
)
−0.5V to +7.0V
−0.5V to +7.0V
DC Switch Voltage (VS) (Note 2)
DC Input Control Pin Voltage
(VIN) (Note 3)
Power Supply Operating (VCC
Input Voltage (VIN
Output Voltage (VOUT
)
4.0V to 5.5V
0V to 5.5V
0V to 5.5V
)
−0.5V to +7.0V
−50 mA
)
DC Input Diode Current (lIK) VIN < 0V
Input Rise and Fall Time (tr, tf)
Switch Control Input
DC Output Current (IOUT
DC VCC/GND Current (ICC/IGND
Storage Temperature Range (TSTG
)
128 mA
0nS/V to 5nS/V
0nS/V to DC
)
+/− 100 mA
−65°C to +150 °C
Switch I/O
)
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” table will define the conditions
for actual device operation.
Note 2: VS is the voltage observed/applied at either the A or B Ports across
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
T
A = −40 °C to +85 °C
Symbol
Parameter
VCC
Units
Conditions
Min
Typ
Max
(V)
4.5
(Note 5)
VIK
Clamp Diode Voltage
−1.2
V
V
IIN = −18mA
VIH
VIL
II
HIGH Level Input Voltage
LOW Level Input Voltage
Input Leakage Current
4.0–5.5
4.0–5.5
5.5
2.0
0.8
±1.0
10
V
µA
µA
µA
µA
Ω
0 ≤ VIN ≤ 5.5V
VIN = 5.5V
0
IOZH, IOZL OFF-STATE Leakage Current
IOZH, IOZL OFF-STATE Leakage Current
5.5
±1.0
±1.0
7
0 ≤ A, ≤ VCC, V
0 ≤ B, ≤ VCC, V
5.5
RON
Switch On Resistance
(Note 6)
4.5
4
4
V
V
V
V
V
IN = 0V, IIN = 64 mA
4.5
7
Ω
IN = 0V, IIN = 30 mA
4.5
8
14
Ω
IN = 2.4V, IIN = 15 mA
IN = 2.4V, IIN = 15 mA
IN = VCC or GND, IOUT = 0
4.0
11
20
Ω
ICC
Quiescent Supply Current
Increase in ICC per Input
5.5
3
µA
mA
∆ ICC
5.5
2.5
One input at 3.4V
Other inputs at VCC or GND
Note 5: Typical values are at VCC = 5.0V and TA = +25°C
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
A = −40 °C to +85 °C,
L = 50 pF, RU= RD = 500Ω
CC = 4.5 − 5.5V CC = 4.0V
C
Symbol
Parameter
Units
Conditions
Figure No.
V
V
Min
Max
Min
Max
tPHL, tPLH
tPZH
A or B, to B or A (Note 7)
Output Enable Time,
SEL to A, B
0.25
0.25
ns
ns
VI = OPEN
Figures 1, 2
Figures 1, 2
7.0
7.0
1.0
1.0
30.0
30.0
6.9
35.0
35.0
7.3
VI = OPEN for tPZH
VI = 7V for tPZL
tPZL
tPHZ
tPLZ
Output Enable Time,
SEL to A, B
ns
ns
ns
Figures 1, 2
Figures 1, 2
Figures 1, 2
Output Disable Time,
SEL to A, B
VI = OPEN for tPHZ
VI = 7V for tPLZ
Output Disable Time,
SEL to A, B
7.7
7.7
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 source (zero output impedance).
Capacitance (Note 8)
Symbol
Parameter
Typ
4
Max
Units
pF
Conditions
CC = 5.0V
CIN
CI/O OFF
Control pin Input Capacitance
Input/Output Capacitance “OFF State”
V
V
8
pF
CC = 5.0V, Switch OFF
Note 8: TA = +25°C, f = 1 MHz, Capacitance is characterized but not tested.
AC Loading and Waveforms
Note: Input driven by 50Ω source terminated in 50Ω
Note: CL 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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Physical Dimensions inches (millimeters) unless otherwise noted
56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Package Number MTD56
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.
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4
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