FST3345WM [FAIRCHILD]

8-Bit Bus Switch; 8位总线开关
FST3345WM
型号: FST3345WM
厂家: FAIRCHILD SEMICONDUCTOR    FAIRCHILD SEMICONDUCTOR
描述:

8-Bit Bus Switch
8位总线开关

总线驱动器 总线收发器 开关 逻辑集成电路 光电二极管
文件: 总6页 (文件大小:122K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
June 1997  
Revised December 1999  
FST3345  
8-Bit Bus Switch  
General Description  
Features  
The Fairchild Switch FST3345 provides 8-bits of high-  
speed CMOS TTL-compatible bus switching. The low on  
resistance of the switch allows inputs to be connected to  
outputs without adding propagation delay or generating  
additional ground bounce noise.  
4switch connection between two ports.  
Minimal propagation delay through the switch.  
Low lCC  
.
Zero bounce in flow-through mode.  
Control inputs compatible with TTL level.  
The device is organized as an 8-bit switch bank with dual  
output enable inputs (OE and OE). When OE is LOW or  
OE is HIGH, the switch is ON and Port A is connected to  
Port B. When OE is HIGH and OE is LOW, the switch is  
OPEN and a high-impedance state exists between the two  
ports.  
Ordering Code:  
Order Number  
FST3345WM  
FST3345QSC  
FST3345MTC  
Package Number  
M20B  
Package Description  
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide  
20-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150 Wide  
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide  
MQA20  
MTC20  
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.  
Logic Diagram  
Connection Diagram  
Pin Descriptions  
Truth Table  
Pin Name  
Description  
Inputs  
Function  
OE, OE  
Bus Switch Enables  
Bus A  
OE  
X
OE  
L
A
B
Connect  
Connect  
Bus B  
H
X
L
H
Disconnect  
© 1999 Fairchild Semiconductor Corporation  
DS500019  
www.fairchildsemi.com  
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  
0nS/V to 5nS/V  
0nS/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 Conditionstable 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  
Typ  
Min  
Max  
(Note 4)  
VIK  
Clamp Diode Voltage  
HIGH Level Input Voltage  
LOW Level Input Voltage  
Input Leakage Current  
OFF-STATE Leakage Current  
Switch On Resistance  
(Note 5)  
4.5  
4.05.5  
4.05.5  
5.5  
1.2  
V
V
IIN = -18mA  
VIH  
VIL  
II  
2.0  
0.8  
±1.0  
±1.0  
7
V
µA  
µA  
0VIN 5.5V  
0 A, B VCC  
IOZ  
RON  
5.5  
4.5  
4
4
V
V
V
V
V
IN = 0V, IIN = 64mA  
4.5  
7
IN = 0V, IIN = 30mA  
4.5  
8
15  
20  
3
IN = 2.4V, IIN = 15mA  
IN = 2.4V, IIN = 15mA  
IN = VCC or GND, IOUT = 0  
4.0  
11  
ICC  
Quiescent Supply Current  
Increase in ICC per Input  
5.5  
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.  
www.fairchildsemi.com  
2
AC Electrical Characteristics  
T
A = −40 °C to +85 °C,  
CL = 50 pF, RU = RD = 500Ω  
Symbol  
Parameter  
Units  
Conditions  
Figure No.  
V
CC = 4.5 5.5V CC = 4.0V  
V
Min  
Max  
Min  
Max  
t
PHL,tPLH  
Prop Delay Bus to Bus (Note 6)  
Output Enable Time  
0.25  
0.25  
ns  
ns  
VI = OPEN  
Figure 1  
Figure 2  
tPZH, tPZL  
1.5  
1.0  
6.5  
8.0  
7.0  
8.2  
VI = 7V for tPZL  
Figure 1  
Figure 2  
VI = OPEN for tPZH  
VI = 7V for tPLZ  
tPHZ, tPLZ  
Output Disable Time  
ns  
Figure 1  
Figure 2  
VI = OPEN for tPHZ  
Note 6: 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 7)  
Symbol  
CIN  
CI/O  
Parameter  
Control Pin Input Capacitance  
Input/Output Capacitance  
Typ  
4
Max  
Units  
pF  
Conditions  
CC = 5.0V  
VCC, OE = 5.0V, OE = 0V  
V
5
pF  
Note 7: TA = +25°C, f = 1 MHz, Capacitance is characterized but not tested.  
AC Loading and Waveforms  
Note: Input driven by 50 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  
3
www.fairchildsemi.com  
Physical Dimensions inches (millimeters) unless otherwise noted  
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide  
Package Number M20B  
20-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150 Wide  
Package Number MQA20  
www.fairchildsemi.com  
4
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)  
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide  
Package Number MTC20  
Technology Description  
The Fairchild Switch family derives from and embodies Fairchilds proven switch technology used for several years in its  
74LVX3L384 (FST3384) bus switch product.  
5
www.fairchildsemi.com  
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  
FAIRCHILDS 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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