FST34X2245_05

FST34X2245 32-Bit Bus Switch with 25: Series Resistors in Outputs December 2001 Revised January 2005 FST34X2245 32-Bit Bus Switch with 25: Series Resistors in Outputs General Description The Fairchild Switch FST34X2245 provides 32-bits of high speed CMOS TTL-compatible bus switching in a standard flow-through mode. 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 a 32-bit switch. 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 FST34X2245 has equivalent 25: series resistors to reduce signal-reflection noise, eliminating the need for external terminating resistors. Features ■ 25: switch connection between two ports ■ Minimal propagation delay through the switch ■ Low lCC ■ Zero bounce in flow-through mode ■ Control inputs compatible with TTL level ■ 32-bit version of FST32245 ■ Packaged in 20.5mm 80-lead package Ordering Code: Order Number FST34X2245QSPX FST34X2245QSPX_NL (Note 1) Package Number MQA80A MQA80A Package Description 80-Lead, QVSOP, JEDEC MO-154, 0.150" Wide Pb-Free 80-Lead, QVSOP, JEDEC MO-154, 0.150" Wide Note 1: “_NL” indicates Pb-Free product (per JEDEC J-STD-020B). Device is available in Tape and Reel only. Logic Diagram © 2005 Fairchild Semiconductor Corporation DS500594 www.fairchildsemi.com FST34X2245 Connection Diagram Pin Descriptions Pin Name OEn An Bn NC Description Bus Switch Enable Bus A Bus B No Connect Function Table Input OEn L H Function Connect Disconnect www.fairchildsemi.com 2 FST34X2245 Absolute Maximum Ratings(Note 2) Supply Voltage (VCC) 0.5V to 7.0V 0.5V to 7.0V DC Switch Voltage (VS) DC Input Voltage (VIN) (Note 3) 0.5V to 7.0V 50mA DC Input Diode Current (lIK) VIN  0V DC Output (IOUT) Sink Current DC VCC/GND Current (ICC/IGND) Storage Temperature Range (TSTG) Recommended Operating Conditions (Note 4) 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 / 100mA 65qC to 150 qC 128mA 40 qC to 85 qC Note 2: 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 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 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 6) 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 Quiescent Supply Current (Note 7) Increase in ICC per Input (Note 8) Note 5: Typical values are at VCC 5.0V and TA TA Min 40 qC to 85 qC Typ (Note 5) Max Units V V 0.8 V IIN Conditions 1.2 2.0 18 mA r1.0 10 PA PA PA : : : : PA mA 0 d VIN d 5.5V VIN VIN VIN VIN VIN VIN 5.5V 0V, IIN 0V, IIN 2.4V, IIN 2.4V, IIN 64 mA 30 mA 15 mA 15 mA 0 0 d A, B d VCC r1.0 20 20 20 20 26 27 28 30 38 40 48 48 3 2.5 5.5 5.5 VCC or GND, IOUT ' ICC One Input at 3.4V Other Inputs at VCC or GND 25qC Note 6: M easured 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 VCC pin. Note 8: Per TTL input, control pins only. 3 www.fairchildsemi.com FST34X2245 AC Electrical Characteristics TA 40 qC to 85 qC, CL 50pF, RU RD 500: Symbol Parameter VCC Min tPHL, tPLH tPZH, tPZL tPHZ, tPLZ Propagation Delay Bus to Bus (Note 9) Output Enable Time Output Disable Time 1.0 1.0 4.5 – 5.5V Max 1.25 5.9 6.0 VCC Min 4.0V Max 1.25 6.4 5.7 ns ns ns VI VI VI VI VI OPEN 7V for tPZL OPEN for tPZH 7V for tPLZ OPEN for tPHZ Figures 1, 2 Figures 1, 2 Figures 1, 2 Units Conditions Figure Number 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 the source (zero output impedance). Capacitance Symbol CIN CI/O Note 10: TA (Note 10) Parameter Typ 3 5 Max Units pF pF VCC Conditions 5.0V 5.0V Control Pin Input Capacitance Input/Output Capacitance 25qC, f VCC, OE 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 FST34X2245 32-Bit Bus Switch with 25: Series Resistors in Outputs Physical Dimensions inches (millimeters) unless otherwise noted 80-Lead, QVSOP, JEDEC MO-154, 0.150" Wide Package Number MQA80A 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. 5 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 www.fairchildsemi.com