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| FST3126 4-Bit Bus Switch August 1997 Revised January 2001 FST3126 4-Bit Bus Switch General Description The Fairchild Switch FST3126 provides four high-speed 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 1-bit switches with separate OE inputs. When OE is HIGH, the switch is ON and Port A is connected to Port B. When OE is LOW, the switch is OPEN and a high-impedance state exists between the two ports. Features s 4 switch connection between two ports. s Minimal propagation delay through the switch. s Low lCC. s Zero bounce in flow-through mode. s Control inputs compatible with TTL level. Ordering Code: Order Number FST3126M FST3126QSC FST3126MTC Package Number M14A MQA16 MTC14 Package Description 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow 16-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150 Wide 14-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 Diagrams Pin Assignment for SOIC and TSSOP Pin Assignment for QSOP Pin Descriptions Pin Name OE1, OE2, OE3, OE4 1A, 2A, 3A, 4A 1B, 2B, 3B, 4B NC Description Bus Switch Enables Bus A Bus B Not Connected Truth Table Inputs OE L H Inputs/Outputs A,B Z A=B (c) 2001 Fairchild Semiconductor Corporation DS500044 www.fairchildsemi.com FST3126 Absolute Maximum Ratings(Note 1) Supply Voltage (VCC ) DC Switch Voltage (VS) DC Input Voltage (VIN) (Note 2) DC Input Diode Current (lIK) VIN<0V DC Output (IOUT ) Sink Current DC VCC/GND Current (ICC/IGND) Storage Temperature Range (TSTG) -0.5V to +7.0V -0.5V to +7.0V -0.5V to +7.0V -50mA 128mA Recommended Operating Conditions (Note 3) 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) 0nS/V to 5nS/V 0nS/V to DC 4.0V to 5.5V 0V to 5.5V 0V to 5.5V +/- 100mA -65C to +150 C -40 C to +85 C 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: 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 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 5) VCC (V) 4.5 4.0-5.5 4.0-5.5 5.5 5.5 4.5 4.5 4.5 4.0 ICC ICC Quiescent Supply Current Increase in ICC per Input 5.5 5.5 4 4 8 11 2.0 0.8 1.0 1.0 7 7 15 20 3 2.5 TA = -40 C to +85 C Min Typ (Note 4) Max -1.2 Units V V V A A A mA 0 VIN 5.5V 0 A, B VCC VIN = 0V, IIN = 64mA VIN = 0V, IIN = 30mA VIN = 2.4V, IIN = 15mA VIN = 2.4V, IIN = 15mA VIN = VCC or GND, IOUT = 0 One input at 3.4V. Other inputs at VCC or GND Note 4: Typical values are at VCC = 5.0V and T A = +25C Note 5: 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. Conditions IIN = -18mA www.fairchildsemi.com 2 FST3126 AC Electrical Characteristics TA = -40 C to +85 C, CL = 50pF, RU = RD = 500 Symbol Parameter VCC = 4.5 - 5.5V Min tPHL,tPLH tPZH, tPZL tPHZ, tPLZ Prop Delay Bus to Bus (Note 6) Output Enable Time Output Disable Time 1.0 1.5 Max 0.25 4.5 5.7 VCC = 4.0V Min Max 0.25 5.0 6.2 ns ns ns VI = OPEN VI = 7V for tPZL VI = OPEN for tPZH VI = 7V for tPLZ VI = OPEN for tPHZ Figures 1, 2 Figures 1, 2 Figures 1, 2 Units Conditions Figure No. Note 6: 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 7) Parameter Typ 3 5 Max Units pF pF VCC = 5.0V VCC = 5.0V, OE = 0V Conditions Control Pin Input Capacitance Input/Output Capacitance Note 7: TA = +25C, f = 1 MHz, Capacitance is characterized but not tested. AC Loading and Waveforms Note: Input driven by 50 source terminated in 50 Note: C L includes load and stray capacitance Note: Input PRR = 1.0MHz, tW = 500ns FIGURE 1. AC Test Circuit FIGURE 2. AC Waveforms 3 www.fairchildsemi.com FST3126 Physical Dimensions inches (millimeters) unless otherwise noted 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow Package Number M14A 16-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150 Wide Package Number MQA16 www.fairchildsemi.com 4 FST3126 4-Bit Bus Switch Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 14-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Package Number MTC14 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: 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 |
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