Revised December 2000 FSTU3384 10-Bit Bus Switch with −2V Undershoot Protection General Description Features The Fairchild Switch FSTU3384 provides 10 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 generating additional ground bounce noise. Both the A Ports and the B Ports have “undershoot hardened” circuit protection to support an extended input range to 2.0V below ground. Fairchild’s integrated Undershoot Hardened Circuit (UHC) senses undershoot at the I/Os, and responds by preventing voltage differentials from developing and turning on the switch. The device is organized as two 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 ■ Undershoot Hardened to -2.0V. ■ Minimal propagation delay through the switch ■ Low lCC. ■ Zero ground bounce in flow-through mode ■ Control inputs compatible with TTL level ■ See Applications Note AN-5008 for details. Ordering Code: Order Number Package Number Package Description FSTU3384WM M24B 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide FSTU3384QSC MQA24 24-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150 Wide FSTU3384MTC MTC24 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 Truth Table Pin Descriptions Pin Names Description OE1, OE2 Bus Switch Enable A0–A9 Bus A B0–B9 Bus B OE1 OE2 L L A0–A4 B0–B4 A5–A9 B5–B9 L H A0–A4 HIGH-Z State H L HIGH-Z State A5–A9 H H HIGH-Z State HIGH-Z State Function Connect Connect Connect Disconnect UHC is a trademark of Fairchild Semiconductor Corporation. © 2000 Fairchild Semiconductor Corporation DS500195 www.fairchildsemi.com FSTU3384 10-Bit Bus Switch with −2V Undershoot Protection May 1999 FSTU3384 Absolute Maximum Ratings(Note 1) Recommended Operating Conditions (Note 3) Supply Voltage (VCC ) −0.5V to +7.0V DC Switch Voltage (VS) −2.0V 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) +/− 100mA DC VCC/GND Current (ICC/IGND) Storage Temperature Range (TSTG) 4.0V to 5.5V Switch Control Input −65°C to +150 °C 0nS/V to 5nS/V Switch I/O 0nS/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 5) Max −1.2 Units Condition IIN = − 18 mA VIK Clamp Diode Voltage VIH HIGH Level Input Voltage 4.0-5.5 VIL LOW Level Input Voltage 4.0-5.5 0.8 V II Input Leakage Current 5.5 ±1.0 µA IOZ OFF-STATE Leakage Current 5.5 ±1.0 µA 0 ≤ A, B ≤ VCC, VIN = VIH RON Switch On Resistance 4.5 7 Ω VS = 0V, IIN = 64 mA (Note 4) 4.5 2.0 V V 4 0 ≤ VIN ≤ 5.5V 4.5 4 7 Ω VS = 0V, IIN = 30 mA 4.5 8 15 Ω VS = 2.4V, IIN = 15 mA 4.0 11 20 Ω VS = 2.4V, IIN = 15 mA ICC Quiescent Supply Current 5.5 3 µA VS = VCC or GND, IOUT = 0 ∆ ICC Increase in ICC per Input 5.5 2.5 mA OE input at 3.4V Other inputs at VCC or GND IBIAS Bias Pin Leakage Current 5.5 ±1.0 µA OE = 0V, B = 0V, BiasV = 5.5V IOZU Switch Undershoot Current 5.5 100 µA IIN= − 20 mA, OE = 5.5V, VOUT ≥ VIH VIKU Voltage Undershoot 5.5 −2.0 V 0.0 mA ≥ IIN ≥ − 50 mA, OE = 5.5V Note 4: 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 5: All typical values are at VCC = 5.0V, TA = 25°C. www.fairchildsemi.com 2 TA = −40°C to +85°C CL = 50 pF, RU = RD = 500Ω Symbol Parameter VCC = 4.5 − 5.5V Min tPHL, tPLH tPZH, tPZL tPHZ, tPLZ Max Prop Delay Bus to Bus (Note 6) Output Enable Time OE1, OE2 to An, Bn Output Disable Time OE1, OE2 to An, Bn VCC = 4.0V Min Units Conditions Figure No. Max 0.25 0.25 ns 1.0 5.7 6.2 ns 1.5 5.2 5.5 ns VI = OPEN Figures 1, 2 VI = 7V for tPZL VI = OPEN for tPZH VI = 7V for tPLZ VI = OPEN for tPHZ Figures 1, 2 Figures 1, 2 Note 6: 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 (Note 7) Units Conditions CIN Control Input Capacitance Parameter Typ 3 Max pF VCC = 5.0V CI/O (OFF) Input/Output Capacitance 5 pF VCC, OE = 5.0V Note 7: Capacitance is characterized but not tested. AC Loading and Waveforms Note: Input driven by 50 Ω source terminated in 50 Ω, RU = RD = 500 Ω Note: C L includes load and stray capacitance, CL= 50 pF Note: Input PRR = 1.0 MHz, tW = 500 ns FIGURE 1. AC Test Circuit FIGURE 2. AC Waveforms 3 www.fairchildsemi.com FSTU3384 AC Electrical Characteristics FSTU3384 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 www.fairchildsemi.com 4 FSTU3384 10-Bit Bus Switch with −2V Undershoot Protection 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: 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 5 www.fairchildsemi.com