Revised June 2005 FST162861 20-Bit Bus Switch with 25: Series Resistors in Outputs General Description Features The Fairchild Switch FST162861 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. ■ 25: switch connection between two ports. The device is organized as a 10-bit or 20-bit bus switch. When OE1 is LOW, the switch is ON and Port 1A is connected to Port 1B. When OE2 is LOW, Port 2A is connected to Port 2B. When OEX is HIGH, a high impedance state exists between the A and B ports. The FST162861 has an equivalent 25: series resistors to reduce signal-reflection noise, eliminating the need for external terminating resistors. ■ Control inputs compatible with TTL level. ■ Minimal propagation delay through the switch. ■ Low lCC. ■ Zero bounce in flow-through mode. Ordering Code: Package Number Package Description FST162861MTD (Note 1) MTD48 48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide FST162861MTDX_NL (Note 2) MTD48 Pb-Free 48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide Order Number Note 1: Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Note 2: “_NL” indicates Pb-Free product (per JEDEC J-STD-020B). Device is available in Tape and Reel only. © 2005 Fairchild Semiconductor Corporation DS500319 www.fairchildsemi.com FST162861 20-Bit Bus Switch with 25: Series Resistors in Outputs March 2000 FST162861 Logic Diagram Connection Diagram Truth Table Inputs OE1 Inputs/Outputs OE2 1A, 1B 2A, 2B 2A L L 1A 1B L H 1A 1B H L Z H H Z www.fairchildsemi.com Pin Descriptions 2B Z 2A 2B Z 2 Pin Name Description OE1, OE2 Bus Switch Enables 1A, 2A Bus A 1B, 2B Bus B Supply Voltage (VCC) DC Switch Voltage (VS) (Note 4) DC Input Voltage (VIN) (Note 5) DC Input Diode Current (lIK) VIN 0V Recommended Operating Conditions (Note 6) 0.5V to 7.0V 0.5V to 7.0V 0.5V to 7.0V 50mA DC Output (IOUT) Current Power Supply Operating (VCC) 128mA DC VCC/GND Current (ICC/IGND) Storage Temperature Range (TSTG) 4.0V to 5.5V Input Voltage (VIN) 0V to 5.5V Output Voltage (VOUT) 0V to 5.5V Input Rise and Fall Time (tr, tf) r100mA 65qC to 150 qC Switch Control Input 0nS/V to 5nS/V Switch I/O 0nS/V to DC -40 qC to 85 qC Free Air Operating Temperature (TA) Note 3: 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 4: VS is the voltage observed/applied at either the A or B Port across the switch. Note 5: The input and output negative voltage ratings may be exceeded if the input and output diode current ratings are observed. Note 6: Unused control inputs must be held HIGH or LOW. They may not float. DC Electrical Characteristics Symbol VCC (V) Parameter 40 qC to 85 qC TA Min Typ (Note 7) Max 1.2 4.5 Units IIN 18mA 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 r1.0 PA VIN 5.5 r1.0 PA 0 d A, B d VCC 2.0 V Conditions V 0 d VIN d 5.5V 5.5V IOZ OFF-STATE Leakage Current RON Switch ON Resistance 4.5 20 26 38 : VIN 0V, IIN 64mA (Note 8) 4.5 20 27 40 : VIN 0V, IIN 30mA 4.5 20 28 48 : VIN 2.4V, IIN 15mA 4.0 20 30 48 : VIN 2.4V, IIN 15mA 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 0 Other inputs at VCC or GND Note 7: Typical values are at VCC 5.0V and TA 25qC Note 8: 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. 3 www.fairchildsemi.com FST162861 Absolute Maximum Ratings(Note 3) FST162861 AC Electrical Characteristics CL Symbol Parameter tPHL,tPLH Prop Delay Bus to Bus (Note 9) tPZH, tPZL Output Enable Time tPHZ, tPLZ TA 40 qC to 85 qC, 50 pF, RU RD 500: VCC 4.5 – 5.5V Min Max Output Disable Time 1.0 1.0 VCC 4.0V Min Units Figure No. Conditions Max 1.25 1.25 ns VI OPEN Figures 1, 2 5.3 5.5 ns VI 7V for tPZL VI OPEN for tPZH Figures 1, 2 VI 7V for tPLZ VI OPEN for tPHZ 6.0 6.3 ns Figures 1, 2 Note 9: 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 (Note 10) Symbol CIN CI/O Note 10: TA Parameter Typ Max Units Conditions Control Pin Input Capacitance 3.5 pF VCC Input/Output Capacitance “OFF State” 6.0 pF VCC, OE 25qC, f 1 MHz, Capacitance is characterized but not tested. AC Loading and Waveforms Note: Input driven by 50: source terminated in 50: Note: CL includes load and stray capacitance Note: Input PRR 1.0 MHz, tW 500 ns FIGURE 1. AC Test Circuit FIGURE 2. AC Waveforms www.fairchildsemi.com 4 5.0V, VIN 0V 5.0V, VIN 0V FST162861 20-Bit Bus Switch with 25: Series Resistors in Outputs Physical Dimensions inches (millimeters) unless otherwise noted 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 5 www.fairchildsemi.com