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| FSTU32X384 20-Bit Low Power Bus Switch with -2V Undershoot Protection May 2002 Revised June 2002 FSTU32X384 20-Bit Low Power Bus Switch with -2V Undershoot Protection General Description The Fairchild Switch FSTU32X384 provides 20 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 four 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. 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. 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 s See Application Note AN-5008 for details on FSTU - Undershoot Protected Fairchild Switch Family Ordering Code: Order Number FSTU32X384QSP Package Number MQA48A Package Description 48-Lead Quarter Size Very Small Outline Package (QVSOP), JEDEC MO-154, 0.150" Wide Device also available in Tape and Reel. Specify by appending suffix letter "X" to the ordering code. Logic Diagram UHC is a trademark of Fairchild Semiconductor Corporation. (c) 2002 Fairchild Semiconductor Corporation DS500705 www.fairchildsemi.com FSTU32X384 Pin Descriptions Pin Names OEX A B Description Bus Switch Enable Bus A Bus B Connection Diagram Truth Table Inputs OEX L H Inputs/Outputs A, B A=B Z www.fairchildsemi.com 2 FSTU32X384 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 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) 0 ns/V to 5 ns/V 0 ns/V to DC 4.0V to 5.5V 0V to 5.5V 0V to 5.5V 100 mA -65C to +150C -40C to +85C 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 0 5.5 4.5 4.5 4.5 4.0 ICC ICC VIKU Quiescent Supply Current (Note 6) Increase in ICC per Input (Note 7) Voltage Undershoot 5.5 -2.0 V 5.5 5.5 4 4 8 11 2.0 0.8 1.0 10 1.0 7 7 15 20 3 2.5 A mA TA = -40C to +85C Min Typ (Note 4) Max -1.2 Units V V V A A 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 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. Note 6: Per VCC pin. Note 7: Per TTL driven input, control pins only. Condition IIN= - 18mA 3 www.fairchildsemi.com FSTU32X384 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 Propagation Delay Bus to Bus (Note 8) Output Enable Time OE1, OE2 to An, Bn Output Disable Time OE1, OE2 to An, Bn 1.0 1.5 Max 0.25 5.7 5.2 VCC = 4.0V Min Max 0.25 6.2 5.5 ns ns ns VI = OPEN VI = 7V for tPZL VI = OPEN for tPZH II = 7V for tPLZ VI = OPEN for tPHZ Figures 2, 3 Figures 2, 3 Figures 2, 3 Units Conditions Figure Number Note 8: 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 9) 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 9: Capacitance is characterized but not tested. Undershoot Characteristic (Note 10) Symbol VOUTU Parameter Output Voltage During Undershoot Min 2.5 Typ VOH - 0.3 Max Units V Conditions Figure 1 Note 10: 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 Transient Input Voltage (VIN) Waveform V V www.fairchildsemi.com 4 FSTU32X384 AC Loading and Waveforms FSTU32X384 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 2. AC Test Circuit FIGURE 3. AC Waveforms 5 www.fairchildsemi.com FSTU32X384 20-Bit Low Power Bus Switch with -2V Undershoot Protection Physical Dimensions inches (millimeters) unless otherwise noted 48-Lead Quarter Size Very Small Outline Package (QVSOP), JEDEC MO-154, 0.150" Wide Package Number MQA48A Technology Description The Fairchild Switch family derives from and embodies Fairchild's proven switch technology used for several years in its 74LVX3L384 (FSTU32X384) 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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