Revised June 2002 FSTU32X384 20-Bit Low Power Bus Switch with −2V Undershoot Protection General Description Features 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. ■ 4Ω switch connection between two ports ■ Minimal propagation delay through the switch ■ Ultra low power with < 0.1 µA typical ICC ■ Zero ground bounce in flow-through mode ■ Control inputs compatible with TTL level ■ See Application Note AN-5008 for details on FSTU - Undershoot Protected Fairchild Switch Family 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. Ordering Code: Order Number Package Number Package Description FSTU32X384QSP MQA48A 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. © 2002 Fairchild Semiconductor Corporation DS500705 www.fairchildsemi.com FSTU32X384 20-Bit Low Power Bus Switch with −2V Undershoot Protection May 2002 FSTU32X384 Pin Descriptions Connection Diagram Pin Names Description OEX Bus Switch Enable A Bus A B Bus B Inputs Inputs/Outputs Truth Table OEX A, B L A=B H Z www.fairchildsemi.com 2 Recommended Operating Conditions (Note 3) Supply Voltage (VCC) −0.5V to +7.0V DC Switch Voltage (VS) −0.5V to +7.0V Power Supply Operating (VCC) DC Input Voltage (VIN) (Note 2) −0.5V to +7.0V Input Voltage (VIN) 0V to 5.5V 0V to 5.5V DC Input Diode Current (IIK) VIN < 0V −50 mA Output Voltage (VOUT) DC Output (IOUT) Sink Current 128 mA Input Rise and Fall Time (tr, tf) ± 100 mA DC VCC/GND Current (ICC/IGND) Storage Temperature Range (TSTG) 4.0V to 5.5V Switch Control Input −65°C to +150°C 0 ns/V to 5 ns/V Switch I/O 0 ns/V to DC −40°C to +85°C Free Air Operating Temperature (TA) 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 Parameter VCC (V) TA = −40°C to +85°C Min Typ (Note 4) Max Units −1.2 V VIK Clamp Diode Voltage VIH HIGH Level Input Voltage 4.0 - 5.5 VIL LOW Level Input Voltage 4.0 - 5.5 0.8 II Input Leakage Current 5.5 ±1.0 0 10 4.5 2.0 Condition IIN= − 18mA V ±1.0 IOZ OFF-STATE Leakage Current 5.5 RON Switch On Resistance 4.5 4 7 (Note 5) 4.5 4 7 4.5 8 15 4.0 11 20 V µA µA 0 ≤ VIN ≤ 5.5V VIN = 5.5V 0 ≤ A, B ≤ VCC VIN = 0V, IIN = 64 mA Ω VIN = 0V, IIN = 30 mA VIN = 2.4V, IIN = 15 mA VIN = 2.4V, IIN = 15 mA ICC Quiescent Supply Current (Note 6) 5.5 3 µA VIN = VCC or GND, IOUT = 0 ∆ ICC Increase in ICC per Input 5.5 2.5 mA One Input at 3.4V 5.5 −2.0 V (Note 7) VIKU Voltage Undershoot 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 = 25°C. 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. 3 www.fairchildsemi.com FSTU32X384 Absolute Maximum Ratings(Note 1) FSTU32X384 AC Electrical Characteristics TA = −40°C to +85°C Symbol CL = 50 pF, RU = RD = 500Ω Parameter VCC = 4.5 − 5.5V Min tPHL, tPLH Max Propagation Delay Bus to Bus (Note 8) tPZH, tPZL Output Enable Time OE1, OE2 to An, Bn tPHZ, tPLZ Output Disable Time OE1, OE2 to An, Bn Units VCC = 4.0V Min Figure Number Conditions Max 0.25 0.25 ns 1.0 5.7 6.2 ns 1.5 5.2 5.5 ns Figures 2, 3 VI = OPEN VI = 7V for tPZL Figures 2, 3 VI = OPEN for tPZH II = 7V for tPLZ Figures 2, 3 VI = OPEN for tPHZ 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 (Note 9) Symbol Typ Max Units CIN Control Input Capacitance Parameter 3 6 pF Conditions VCC = 5.0V CI/O (OFF) Input/Output Capacitance 5 13 pF VCC, OE = 5.0V Note 9: Capacitance is characterized but not tested. Undershoot Characteristic (Note 10) Symbol VOUTU Parameter Min Typ Output Voltage During Undershoot 2.5 VOH - 0.3 Max Units Conditions V 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 Value VIN see Waveform V R1 = R2 100K Ω VTRI 11.0 V VCC 5.5 V www.fairchildsemi.com Transient Input Voltage (VIN) Waveform Units 4 FSTU32X384 VIN vs. RON (Typ) Note: Input driven by 50 Ω source terminated in 50 Ω 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 AC Loading and Waveforms 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: 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. 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 www.fairchildsemi.com 6