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FST3384 10-Bit Low Power Bus Switch
September 1997 Revised December 1999
FST3384 10-Bit Low Power Bus Switch
General Description
The Fairchild Switch FST3384 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 or generating additional ground bounce noise. 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.
Features
s 4 switch connection between two ports s Minimal propagation delay through the switch s Ultra low power with < 0.1 A typical ICC s Zero ground bounce in flow-through mode s Control inputs compatible with TTL level
Ordering Code:
Order Number FST3384WM FST3384QSC FST3384MTC Package Number M24B MQA24 MTC24 Package Description 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 24-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150 Wide 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
Pin Descriptions
Pin Names OEA, OEB A0-A9 B0-B9 Description Bus Switch Enable Bus A Bus B
Truth Table
OEA OEB L L H H L H L H B0-B4 A0-A4 A0-A4 B5-B9 A5-A9 HIGH-Z State Function Connect Connect Connect Disconnect
HIGH-Z State A5-A9 HIGH-Z State HIGH-Z State
(c) 1999 Fairchild Semiconductor Corporation
DS500046
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Print form created on December 13, 1999 4:03
FST3384
Absolute Maximum Ratings(Note 1)
Supply Voltage (VCC ) DC Switch Voltage (VS) DC Input Voltage (VIN) (Note 2) DC Input Diode Current (IIK) VIN<0V DC Output (IOUT ) Sink Current DC VCC/GND Current (ICC/IGND) Storage Temperature Range (TSTG) -0.5V to +7.0V -0.5V to +7.0V -0.5V to +7.0V -50 mA 128 mA +/- 100mA -65C to +150C
Recommended Operating Conditions (Note 3)
Power Supply Operating (VCC) Input Voltage (VIN) Output Voltage (VOUT) Input Rise and Fall Time (tr, tf) Switch Control Input Switch I/O Free Air Operating Temperature (TA) 0nS/V to 5nS/V 0nS/V to DC -40C to +85C 4.0V to 5.5V 0V to 5.5V 0V to 5.5V
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 VIK VIH VIL II IOZ RON Parameter Clamp Diode Voltage HIGH Level Input Voltage LOW Level Input Voltage Input Leakage Current OFF-STATE Leakage Current Switch On Resistance (Note 5) VCC (V) 4.5 4.0-5.5 4.0-5.5 5.5 5.5 4.5 4.5 4.5 4.0 ICC ICC Quiescent Supply Current Increase in ICC per Input 5.5 5.5 4 4 8 11 2.0 0.8 1.0 1.0 7 7 15 20 3 2.5 TA = -40C to +85C Min Typ (Note 4) Units Max -1.2 V V V A A A mA 0 VIN 5.5V 0 A, B VCC VIN = 0V, IIN = 64mA VIN = 0V, IIN = 30mA VIN = 2.4V, IIN = 15mA VIN = 2.4V, IIN = 15mA VIN = VCC or GND, IOUT = 0 One input at 3.4V Other inputs at VCC or GND
Note 4: All typical values are at VCC = 5.0V, TA = 25C. Note 5: 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.
Condition IIN= - 18mA
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FST3384
AC Electrical Characteristics
TA = -40C to +85C Symbol Parameter CL = 50 pF, RU = RD = 500 VCC = 4.5 - 5.5V Min tPHL, tPLH tPZH, tPZL tPHZ, tPLZ Prop Delay Bus to Bus (Note 6) Output Enable Time OEA, OE B to An, Bn Output Disable Time OEA, OE B to An, Bn 1.5 5.2 5.5 ns 1.0 Max 0.25 5.7 VCC = 4.0V Min Max 0.25 6.2 ns ns VI = OPEN VI = 7V for tPZL VI = OPEN for tPZH II = 7V for tPLZ VI = OPEN for tPHZ Figure 1 Figure 2 Figure 1 Figure 2 Figure 1 Figure 2 Units Conditions Figure No.
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 CIN CI/O (OFF)
(Note 7)
Parameter Typ 3 5 Max 6 13 Units pF pF Conditions VCC = 5.0V VCC, OE = 5.0V
Control Input Capacitance Input/Output Capacitance
Note 7: Capacitance is characterized but not tested.
AC Loading and Waveforms
FST3384 VIN vs RON (Typ)
Note: Input driven by 50 source terminated in 50 Note: C L 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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FST3384
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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FST3384 10-Bit Low Power Bus Switch
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: 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. 5 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. www.fairchildsemi.com
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