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FST6800 10-Bit Bus Switch with Pre-Charged Outputs
June 1997 Revised December 1999
FST6800 10-Bit Bus Switch with Pre-Charged Outputs
General Description
The Fairchild Switch FST6800 provides 10-bits of highspeed 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. The device precharges the B Port to a selectable bias voltage (BiasV) to minimize live insertion noise. The device is organized as a 10-bit switch with a bus enable (OE) signal. 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 the B Port is precharged to BiasV through an equivalent 10-k resistor.
Features
s 4 switch connection between two ports. s Minimal propagation delay through the switch. s Low lCC. s Zero bounce in flow-through mode. s Output precharge to minimize live insertion noise. s Control inputs compatible with TTL level.
Ordering Code:
Order Number FST6800WM FST6800QSC FST6800MTC 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 Name OE A B Description Bus Switch Enable Bus A Bus B
Truth Table
OE L H B0-B9 A0-A9 BiasV Function Connect Precharge
(c) 1999 Fairchild Semiconductor Corporation
DS500022
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FST6800
Absolute Maximum Ratings(Note 1)
Supply Voltage (VCC ) DC Switch Voltage (VS) Bias V Voltage Range DC Input Voltage (VIN) (Note 2) DC Input Diode Current (lIK) 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 +6.0V -0.5V to +7.0V -50mA 128mA +/- 100mA -65C to +150 C
Recommended Operating Conditions (Note 3)
Power Supply Operating (VCC) Precharge Supply (BiasV) 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 -40 C to +85 C 4.0V to 5.5V 1.5V to VCC 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 tables are not guaranteed at the absolute maximum ratings. The Recommended Operating Conditions tables 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 IO IOZ RON Parameter Clamp Diode Voltage HIGH Level Input Voltage LOW Level Input Voltage Input Leakage Current Output Current OFF-STATE Leakage Current Switch On Resistance (Note 5) VCC (V) 4.5 4.0-5.5 4.0-5.5 5.5 4.5 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 0.25 1.0 7 7 15 20 3 2.5 2.0 0.8 1.0 TA = -40 C to +85 C Min Typ (Note 4) Max -1.2 Units V V V A mA A A mA 0 VIN 5.5V BiasV = 2.4V, B = 0 0 A 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: Typical values are at VCC = 5.0V and T A= +25C 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.
Conditions IIN = -18mA
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FST6800
AC Electrical Characteristics
TA = -40 C to +85 C, CL = 50pF, RU = RD = 500 Symbol Parameter VCC = 4.5 - 5.5V Min tPHL,tPLH tPZH tPZL tPHZ tPLZ Output Disable Time Prop Delay Bus to Bus (Note 6) Output Enable Time 1.5 1.5 1.5 1.5 Max 0.25 6.2 6.2 6.1 7.3 VCC = 4.0V Min Max 0.25 6.5 6.5 6.5 6.8 ns ns ns ns ns VI = OPEN VI = OPEN, BiasV = GND VI = 7V, BiasV = 3V VI = OPEN, BiasV = GND VI = 7V, BiasV = 3V Figures 1, 2 Figure 1 Figure 2 Figure 1 Figure 2 Units Conditions Figure No.
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
Symbol CIN CI/O
(Note 7)
Parameter Typ 3 5 Max Units pF pF Conditions VCC = 5.0V VCC, OE = 5.0V
Control Pin Input Capacitance Input/Output Capacitance
Note 7: TA = +25C, f = 1 MHz, Capacitance is characterized but not tested.
AC Loading and Waveforms
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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FST6800
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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FST6800 10-Bit Bus Switch with Pre-Charged Outputs
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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