Revised October 2006 FSTU16862 20-Bit Bus Switch with 2V Undershoot Protection General Description Features The Fairchild Switch FSTU16862 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. ■ Undershoot hardened to 2V (A and B Ports) The device is organized as a 20-bit bus switch. When OEX is LOW, the switch is ON and Port A is connected to Port B. 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. ■ Zero bounce in flow-through mode ■ 4: switch connection between two ports ■ Minimal propagation delay through the switch ■ Low lCC ■ Control inputs compatible with TTL level ■ See Application Note AN-5008 for details on FSTU - Undershoot Protected Fairchild Switch Family Ordering Code: Order Number Package Number Package Description FSTU16862QSP MQA48A 48-Lead Quarter Size Very Small Outline Package (QVSOP), JEDEC MO-154, 0.150" Wide FSTU16862MTD MTD48 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 registered trademark of Fairchild Semiconductor Corporation. © 2005 Fairchild Semiconductor Corporation DS500703 www.fairchildsemi.com FSTU16862 20-Bit Bus Switch with 2V Undershoot Protection May 2002 FSTU16862 Logic Diagram Connection Diagram Pin Descriptions Pin Name Description OEx Bus Switch Enables A Bus A B Bus B Truth Table Inputs OEx L H Inputs/Outputs A, B B A Z H HIGH Voltage Level L LOW Voltage Level Z High Impedance www.fairchildsemi.com 2 Supply Voltage (VCC) DC Switch Voltage (VS) (Note 2) DC Input Voltage (VIN) (Note 3) DC Input Diode Current (lIK) VIN 0V Recommended Operating Conditions (Note 4) 0.5V to 7.0V 2.0V to 7.0V 0.5V to 7.0V 50 mA DC Output Current (IOUT) 128 mA DC VCC/GND Current (ICC/IGND) Storage Temperature Range (TSTG) 4.0V to 5.5V Power Supply Operating (VCC) Input Voltage (VIN) 0V to 5.5V Output Voltage (VOUT) 0V to 5.5V Input Rise and Fall Time (tr, tf) r100 mA 65qC to 150 qC Switch Control Input 0 ns/V to 5 ns/V Switch I/O 0 ns/V to DC -40 qC to 85 qC 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 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 Parameter (V) 40 qC to 85 qC TA Min Typ (Note 5) Max 1.2 4.5 Units 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 r1.0 PA 0 d VIN d 5.5V 0 10 PA VIN 5.5 r1.0 PA 0 d A, B d VCC 2.0 V Conditions V 5.5V IOZ OFF-STATE Leakage Current RON Switch On Resistance 4.5 4 7 : VIN 0V, IIN 64 mA (Note 6) 4.5 4 7 : VIN 0V, IIN 30 mA 4.5 8 14 : VIN 2.4V, IIN 15 mA 4.0 11 20 : VIN 2.4V, IIN 15 mA VCC or GND, IOUT ICC Quiescent Supply Current 5.5 3 PA VIN ' ICC Increase in ICC per Input 5.5 2.5 mA One Input at 3.4V 5.5 2.0 V (Note 7) VIKU Other Inputs at VCC or GND Voltage Undershoot 0.0 mA t IIN t 50 mA OE Note 5: Typical values are at VCC 0 5.0V and TA 5.5V 25qC 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. Note 7: Per TTL driven input, control pins only. 3 www.fairchildsemi.com FSTU16862 Absolute Maximum Ratings(Note 1) FSTU16862 AC Electrical Characteristics TA Symbol CL Parameter tPHL, tPLH Propagation Delay Bus-to-Bus (Note 8) tPZH, tPZL Output Enable Time tPHZ, tPLZ 40 qC to 85 qC, 50pF, RU VCC 4.5 – 5.5V Min Max 1.0 Output Disable Time 1.0 RD 500: VCC Units Figure Conditions 4.0V Min Number Max 0.25 0.25 ns 5.9 6.4 ns 6.9 7.4 ns VI OPEN Figures 2, 3 Figures 2, 3 VI 7V for tPZL VI OPEN for tPZH VI 7V for tPLZ VI OPEN for tPHZ Figures 2, 3 Note 8: 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 9: TA (Note 9) Parameter Typ Max Units Conditions Control Pin Input Capacitance 3 pF VCC Input/Output Capacitance “OFF State” 6 pF VCC, OE 25qC, f 5.0V, VIN 0V 5.0V, VIN 0V 1 MHz, Capacitance is characterized but not tested. Undershoot Characteristic (Note 10) Symbol VOUTU Parameter Output Voltage During Undershoot Min Typ 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 100K : VTRI 11.0 V VCC 5.5 V R1 R2 www.fairchildsemi.com Transient Input Voltage (VIN) Waveform Units 4 FSTU16862 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 5 www.fairchildsemi.com FSTU16862 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 www.fairchildsemi.com 6 FSTU16862 20-Bit Bus Switch with 2V Undershoot Protection Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 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: 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 7 www.fairchildsemi.com