FST34X2245 [FAIRCHILD]
32-Bit Bus Switch with 25з Series Resistors in Outputs; 32位总线开关与25з系列电阻的输出
| 型号： | FST34X2245 |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | 32-Bit Bus Switch with 25з Series Resistors in Outputs |
| 文件： | 总5页 (文件大小：364K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
December 2001
Revised December 2001
FST34X2245
32-Bit Bus Switch with 25Ω Series Resistors in Outputs
General Description
Features
■ 25Ω switch connection between two ports
■ Minimal propagation delay through the switch
■ Low lCC
The Fairchild Switch FST34X2245 provides 32-bits of high
speed CMOS TTL-compatible bus switching in a standard
flow-through mode. The low On Resistance of the switch
allows inputs to be connected to outputs without adding
propagation delay or generating additional ground bounce
noise.
■ Zero bounce in flow-through mode
■ Control inputs compatible with TTL level
■ 32-bit version of FST32245
The device is organized as a 32-bit switch. 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-imped-
ance state exists between the two ports.
■ Packaged in 20.5mm 80-lead package
The FST34X2245 has equivalent 25Ω series resistors to
reduce signal-reflection noise, eliminating the need for
external terminating resistors.
Ordering Code:
Order Number
Package Number
Package Description
FST34X2245QSP
MQA80A
80-Lead, QVSOP, JEDEC MO-154, 0.150" Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Diagram
© 2001 Fairchild Semiconductor Corporation
DS500594
www.fairchildsemi.com
Connection Diagram
Pin Descriptions
Pin Name
Description
OEn
An
Bus Switch Enable
Bus A
Bn
Bus B
NC
No Connect
Function Table
Input OEn
Function
Connect
L
H
Disconnect
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2
Absolute Maximum Ratings(Note 1)
Recommended Operating
Conditions (Note 3)
Supply Voltage (VCC
)
−0.5V to +7.0V
−0.5V to +7.0V
−0.5V to +7.0V
−50mA
DC Switch Voltage (VS)
Power Supply Operating (VCC
Input Voltage (VIN
Output Voltage (VOUT
)
4.0V to 5.5V
0V to 5.5V
0V to 5.5V
DC Input Voltage (VIN) (Note 2)
DC Input Diode Current (lIK) VIN < 0V
DC Output (IOUT) Sink Current
)
)
128mA
Input Rise and Fall Time (tr, tf)
Switch Control Input
DC VCC/GND Current (ICC/IGND
)
+/− 100mA
0 ns/V to 5 ns/V
0 ns/V to DC
Storage Temperature Range (TSTG
)
−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: 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
T
A = −40 °C to +85 °C
VCC
(V)
Symbol
Parameter
Units
Conditions
Min
Typ
Max
(Note 4)
VIK
Clamp Diode Voltage
4.5
4.0–5.5
4.0–5.5
5.5
−1.2
V
V
IIN = −18 mA
VIH
VIL
II
HIGH Level Input Voltage
LOW Level Input Voltage
Input Leakage Current
2.0
0.8
±1.0
10
V
µA
µA
µA
Ω
0 ≤ VIN ≤ 5.5V
IN = 5.5V
0 ≤ A, B ≤ VCC
0
V
IOZ
OFF-STATE Leakage Current
Switch On Resistance
(Note 5)
5.5
±1.0
38
RON
4.5
20
20
20
20
26
27
28
30
V
V
V
V
V
IN = 0V, IIN = 64 mA
4.5
40
Ω
IN = 0V, IIN = 30 mA
4.5
48
Ω
IN = 2.4V, IIN = 15 mA
IN = 2.4V, IIN = 15 mA
IN = VCC or GND, IOUT = 0
4.0
48
Ω
ICC
Quiescent Supply Current (Note 6)
Increase in ICC per Input
(Note 7)
5.5
3
µA
mA
∆ ICC
5.5
2.5
One Input at 3.4V
Other Inputs at VCC or GND
Note 4: Typical values are at VCC = 5.0V and TA = +25°C
Note 5: 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.
Note 6: Per VCC pin.
Note 7: Per TTL input, control pins only.
3
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AC Electrical Characteristics
T
A = −40 °C to +85 °C,
C
L = 50pF, RU = RD = 500Ω
Figure
Number
Symbol
Parameter
Units
Conditions
V
CC = 4.5 – 5.5V CC = 4.0V
V
Min
Max
Min
Max
t
PHL, tPLH
Propagation Delay Bus to Bus
(Note 8)
1.25
1.25
ns
ns
VI = OPEN
Figures
1, 2
tPZH, tPZL
Output Enable Time
1.0
1.0
5.9
6.0
6.4
5.7
VI = 7V for tPZL
Figures
1, 2
VI = OPEN for tPZH
VI = 7V for tPLZ
tPHZ, tPLZ
Output Disable Time
ns
Figures
1, 2
VI = OPEN for tPHZ
Note 8: 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 9)
Symbol
CIN
CI/O
Parameter
Typ
Max
Units
Conditions
CC = 5.0V
VCC, OE = 5.0V
Control Pin Input Capacitance
3
pF
V
Input/Output Capacitance
5
pF
Note 9: TA = +25°C, f = 1 MHz, Capacitance is characterized but not tested.
AC Loading and Waveforms
Note: Input driven by 50 Ω source terminated in 50 Ω
Note: CL includes load and stray capacitance
Note: Input PRR = 1.0 MHz tW = 500 ns
FIGURE 1. AC Test Circuit
FIGURE 2. AC Waveforms
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Physical Dimensions
80-Lead, QVSOP, JEDEC MO-154, 0.150" Wide
Package Number MQA80A
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.
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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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