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FSTU16861 20-Bit Bus Switch with -2V Undershoot Protection
May 2001 Revised May 2001
FSTU16861 20-Bit Bus Switch with -2V Undershoot Protection
General Description
The Fairchild Switch FSTU16861 provides 20-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 is organized as a 10-bit or 20-Bit bus switch. When OE1 is LOW, the switch is ON and Port 1A is connected to Port 1B. When OE2 is LOW, Port 2A is connected to Port 2B. When OEX is HIGH, a high impedance state exists between the A and B Ports. The A and B Ports are protected against undershoot to support an extended range to 2.0V below ground. Fairchild's integrated Undershoot Hardened Circuit (UHC) senses undershoot at the I/O and responds by preventing voltage differentials from developing and turning the switch on. When OE is HIGH, the switch is OPEN and a high-impedance state exists between the two ports.
Features
s Undershoot hardened to -2V (A and B Ports) 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 Control inputs compatible with TTL level s See Application Note AN-5008 for details
Ordering Code:
Order Number FSTU16861MTD Package Number MTD48 Package Description 48-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.
UHC is a trademark of Fairchild Semiconductor Corporation.
(c) 2001 Fairchild Semiconductor Corporation
DS500422
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FSTU16861
Connection Diagram
Logic Diagram
Pin Descriptions
Pin Name OE1, OE2 1An, 2An 1Bn, 2Bn Description Bus Switch Enables Bus A Bus B
Truth Table
Inputs OE1 L L H H OE2 L H L H Inputs/Outputs 1A, 1B 1A = 1B 1A = 1B Z Z 2A, 2B 2A = 2B Z 2A = 2B Z
H = HIGH Voltage Level L = LOW Voltage Level Z = High Impedance
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FSTU16861
Absolute Maximum Ratings(Note 1)
Supply Voltage (VCC) DC Switch Voltage (VS) (Note 2) DC Input Voltage (VIN) (Note 3) DC Input Diode Current (lIK) VIN < 0V DC Output Current (IOUT) DC VCC/GND Current (ICC/IGND) Storage Temperature Range (TSTG)
-0.5V to +7.0V -2.0V to +7.0V -0.5V to +7.0V -50 mA
128 mA
Recommended Operating Conditions (Note 4)
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) 0 ns/V to 5 ns/V 0 ns/V to DC -40 C to +85 C 4.0V to 5.5V 0V to 5.5V 0V to 5.5V
100 mA -65C to +150 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
VCC 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 6) (V) 4.5 4.0-5.5 4.0-5.5 5.5 0 5.5 4.5 4.5 4.5 4.0 ICC ICC VIKU Quiescent Supply Current Increase in ICC per Input Voltage Undershoot 5.5 5.5 5.5 4 4 8 11 2.0 0.8 1.0 10 1.0 7 7 14 20 3 2.5 -2.0 Min TA = -40 C to +85 C Typ (Note 5) Max -1.2 Units V V V A A A A mA V 0 VIN 5.5V VIN = 5.5V 0 A, B VCC VIN = 0V, IIN = 64 mA VIN = 0V, IIN = 30 mA VIN = 2.4V, IIN = 15 mA VIN = 2.4V, IIN = 15 mA VIN = VCC or GND, IOUT = 0 One Input at 3.4V Other Inputs at VCC or GND 0.0 mA IIN -50 mA OE = 5.5V
Note 5: Typical values are at VCC = 5.0V and TA = +25C 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.
Conditions IIN = -18 mA
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FSTU16861
AC Electrical Characteristics
TA = -40 C to +85 C, Symbol Parameter CL = 50pF, RU = RD = 500 VCC = 4.5 - 5.5V Min tPHL, tPLH tPZH, tPZL tPHZ, tPLZ Propagation Delay Bus-to-Bus (Note 7) Output Enable Time Output Disable Time 1.0 1.0 Max 0.25 5.9 6.9 VCC = 4.0V Min Max 0.25 6.4 7.4 ns ns ns VI = OPEN VI = 7V for tPZL VI = OPEN for tPZH VI = 7V for tPLZ VI = OPEN for tPHZ Figures 2, 3 Figures 2, 3 Figures 2, 3 Units Conditions Figure Number
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
Symbol CIN CI/O
(Note 8)
Parameter Typ 3 6 Max Units pF pF Conditions VCC = 5.0V, VIN = 0V VCC, OE = 5.0V, VIN = 0V
Control Pin Input Capacitance Input/Output Capacitance "OFF State"
Note 8: TA = +25C, f = 1 MHz, Capacitance is characterized but not tested.
Undershoot Characteristic (Note 9)
Symbol VOUTU Parameter Output Voltage During Undershoot Min 2.5 Typ VOH - 0.3 Max Units V Conditions Figure 1
Note 9: This test is intended to characterize the device's protective capabilities by maintaining output signal integrity during an input transient voltage undershoot event.
FIGURE 1.
Device Test Conditions
Parameter VIN R1 = R2 VTRI VCC Value see Waveform 100K 11.0 5.5 Units V V V
Transient Input Voltage (VIN) Waveform
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FSTU16861
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 2. AC Test Circuit
FIGURE 3. AC Waveforms
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FSTU16861 20-Bit Bus Switch with -2V Undershoot Protection
Physical Dimensions inches (millimeters) unless otherwise noted
48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide Package Number MTD48
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. www.fairchildsemi.com 6 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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