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| FSTU32160A 16-Bit to 32-Bit Multiplexer/Demultiplexer Bus Switch with -2V Undershoot Protection June 1999 Revised December 2000 FSTU32160A 16-Bit to 32-Bit Multiplexer/Demultiplexer Bus Switch with -2V Undershoot Protection General Description The Fairchild Switch FSTU32160A is a 16-bit to 32-bit high-speed CMOS TTL-compatible multiplexer/demultiplexer bus switch. 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 can be used in applications where two buses need to be addressed simultaneously. The FSTU32160A is designed so that the A Port demultiplexes into B1 or B2 or both. The A and B Ports have "undershoot hardened" circuit protection to support an extended range to 2.0V below ground. Fairchild's integrated Undershoot Hardened Circuit, UHC senses undershoot at the I/O's, and responds by preventing voltage differentials from developing and turning on the switch. Two select (S1, S2) inputs provide switch enable control. When S1, S2 are HIGH, the device precharges the B Port to a selectable bias voltage (Bias V) to minimize live insertion noise. 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 Applications Note AN-5008 for details Ordering Code: Order Number FSTU32160AMTD Package Number MTD56 Package Description 56-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) 2000 Fairchild Semiconductor Corporation DS500258 www.fairchildsemi.com FSTU32160A Connection Diagram Pin Descriptions Pin Name S1 , S2 A B1 , B2 Description Select Inputs Bus A Bus B Truth Table Inputs S1 L H L H S2 H L L H Function x A = x B1 x A = x B2 x A = x B1 and x B2 x B1, x B2 = BiasV Logic Diagram www.fairchildsemi.com 2 FSTU32160A Absolute Maximum Ratings(Note 1) Supply Voltage (VCC) DC Switch Voltage (VS) (Note 2) BiasV Voltage Range DC Input Control Pin 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 -0.5V to +7.0V -50 mA 128 mA Recommended Operating Conditions (Note 4) 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 4.0V to 5.5V 1.5 to VCC 0V to 5.5V 0V to 5.5V +/- 100 mA -65C to +150 C -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: 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 TA = -40 C to +85 C Symbol Parameter VCC (V) VIK VIH VIL II IO IOZH, IOZL IOZH, IOZL RON Clamp Diode Voltage HIGH Level Input Voltage LOW Level Input Voltage Input Leakage Current Output Current OFF-STATE Leakage Current OFF-STATE Leakage Current Switch On Resistance (Note 6) 4.5 4.0-5.5 4.0-5.5 5.5 0 4.5 5.5 5.5 4.5 4.5 4.5 4.0 ICC ICC IBIAS VIKU Quiescent Supply Current Increase in ICC per Input Bias Pin Leakage Current Voltage Undershoot 5.5 5.5 5.5 5.5 4 4 8 11 0.25 1.0 1.0 7 7 14 20 3 2.5 1.0 -2.0 2.0 0.8 1.0 10 Min Typ (Note 5) -1.2 V V V A A mA A A A mA A V 0 VIN 5.5V VIN = 5.5V BiasV = 2.4V BX = 0 0 A V CC, V BiasV1 = BiasV2 = 5.5V 0 B V CC, V BiasV1 = BiasV2 = Floating 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 SEL1, SEL2 = 0V BX = 0V, BiasVX = 5.5V 0.0 mA IIN -50 mA SEL1, SEL2 = 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. Max Units IIN = -18mA Conditions 3 www.fairchildsemi.com FSTU32160A AC Electrical Characteristics TA = -40 C to +85 C, CL = 50 pF, RU= RD = 500 Symbol Parameter VCC = 4.5 - 5.5V Min tPHL, tPLH tPZH tPZL tPHZ tPLZ A or B, to B or A (Note 7) Output Enable Time, SEL to A, B Output Enable Time, SEL to A, B Output Disable Time, SEL to A, B Output Disable Time, SEL to A, B Max 0.25 VCC = 4.0V Min Max 0.25 ns VI = OPEN VI = OPEN for tPZH BiasV = GND VI = 7V for tPZL BiasV = 3V VI = Open for tPHZ BiasV = GND VI = 7V for tPLZ BiasV = 3V Figures 2, 3 Figures 2, 3 Figures 2, 3 Figures 2, 3 Figures 2, 3 Units Conditions Figure No. 0.5 1.0 1.0 1.0 4.0 4.8 5.9 7.4 4.5 5.5 6.9 7.0 ns ns ns ns 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 OFF (Note 8) Parameter Typ 4 8 Max Units pF pF Conditions VCC = 5.0V VCC = 5.0V, Switch OFF 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 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 www.fairchildsemi.com 4 FSTU32160A AC Loading and Waveforms Note: Input driven by 50 source terminated in 50 Note: C L includes load and stray capacitance, CL = 50 pF Note: Input PRR = 1.0 MHz, tW = 500 ns FIGURE 2. AC Test Circuit FIGURE 3. AC Waveforms 5 www.fairchildsemi.com FSTU32160A 16-Bit to 32-Bit Multiplexer/Demultiplexer Bus Switch with -2V Undershoot Protection Physical Dimensions inches (millimeters) unless otherwise noted 56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide Package Number MTD56 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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