Revised February 2001 FST3306 2-Bit Low Power Bus Switch General Description Features The FST3306 is a 2-bit ultra high-speed CMOS FET bus switch with TTL-compatible active LOW control inputs. The low on resistance of the switch allows inputs to be connected to outputs with minimal propagation delay and without generating additional ground bounce noise. The device is organized as a 2-bit switch with independent bus enable (BE) controls. When BE is LOW, the switch is ON and Port A is connected to Port B. When BE is HIGH, the switch is OPEN and a high-impedance state exists between the two ports. Control inputs tolerate voltages up to 5.5V independent of VCC. ■ Typical 3Ω switch resistance at 5.0V VCC ■ Minimal propagation delay through the switch ■ Power down high impedance input/output ■ Zero bounce in flow through mode. ■ TTL compatible active LOW control inputs ■ Control inputs are overvoltage tolerant Ordering Code: Order Number Package Number FST3306MTC MTC08 Package Description 8-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 Symbol Connection Diagram (Top View) Pin Descriptions Function Table Pin Name Description Bus Enable Input BE Function A Bus A L B Connected to A H Disconnected B Bus B BE Bus Enable Input © 2001 Fairchild Semiconductor Corporation DS500479 H = HIGH Logic Level L = LOW Logic Level www.fairchildsemi.com FST3306 2-Bit Low Power Bus Switch February 2001 FST3306 Absolute Maximum Ratings(Note 1) Recommended Operating Conditions (Note 3) Supply Voltage (VCC) −0.5V to +7.0V DC Switch Voltage (VS) −0.5V to +7.0V Supply Operating (VCC) DC Output Voltage (VIN) (Note 2) −0.5V to +7.0V Control Input Voltage (VIN) 0V to 5.5V Switch Input Voltage (VIN) 0V to 5.5V DC Input Diode Current (IIK) VIN < 0V DC Output (IOUT) Current Storage Temperature Range (TSTG) −50 mA Output Voltage (VOUT) 128 mA Operating Temperature (TA) ±100 mA DC VCC or Ground Current (ICC/GND) 0V to 5.5V −40°C to +85°C Input Rise and Fall Time (tr, tf) −65°C to +150°C Control Input +150°C Junction Lead Temperature under Bias (TJ) 4.0V to 5.5V 0 ns/V to 5 ns/V Switch I/O 0 ns/V to DC Thermal Resistance (θJA) Lead Temperature (TL) 250°C/W +260°C (Soldering, 10 seconds) Power Dissipation (PD) @ +85°C 250 mW 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 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 logic inputs must be held HIGH or LOW. They may not float. DC Electrical Characteristics Symbol Parameter TA = −40°C to +85°C VCC (V) Min Typ Max −1.2 VIK Clamp Diode Voltage VIH HIGH Level Input Voltage 4.0–5.5 VIL LOW Level Input Voltage 4.0–5.5 VOH HIGH Level Output Voltage 4.5–5.5 IIN Input Leakage Current 5.5 IOFF Switch OFF Leakage Current 5.5 RON Switch On Resistance 4.5 3 7 (Note 4) 4.5 3 7 4.5 6 15 4.0 10 20 4.5 ICC Quiescent Supply Current 5.5 ∆ICC Increase in ICC per Input 5.5 2.0 Units V Conditions IIN = −18 mA V 0.8 V ±1.0 µA 0 ≤ VIN ≤ 5.5V ±1.0 µA 0 ≤ A, B, ≤ VCC see Figure 3 V VIN = VCC VIN = 0V, IIN = 64 mA Ω VIN = 0V, IIN = 30 mA VIN = 2.4V, IIN = 15 mA VIN = 2.4V, IIN = 15 mA 3 µA VIN = VCC or GND, 2.5 mA VIN = 3.4V, IO = 0, IOUT = 0 1 (Note 5) Control Input Only Note 4: 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 5: Per TTL driven input (VIN = 3.4V, control input only). A and B pins do not contribute to ICC. www.fairchildsemi.com 2 TA = −40°C to +85°C Symbol Parameter CL = 50 pF, RU = RD = 500Ω VCC (V) tPHL, Prop Delay Bus to Bus tPLH (Note 6) tPZL, Output Enable Time tPZH tPLZ, Output Disable Time tPHZ Min Typ 4.0–5.5 Units Conditions Figure Number Max 0.25 4.5–5.5 0.8 2.5 4.2 4.0 0.8 3.0 4.6 4.5–5.5 0.8 3.1 4.8 4.0 0.8 2.9 4.4 ns ns VI = OPEN Figures 1, 2 VI = 7V for tPZL Figures 1, 2 VI = 0V for tPZH VI = 7V for tPLZ ns Figures 1, 2 VI = 0V for tPHZ Note 6: This parameter is guaranteed. The bus switch contributes no propagation delay other than the RC delay of the typical On resistance of the switch and the 50 pF load capacitance, when driven by an ideal voltage source (zero output impedance). The specified limit is calculated on this basis. Capacitance Symbol Parameter Typ Max 2.5 Units pF Conditions VCC = 0V CIN Control Pin Input Capacitance CI/O (OFF) Port OFF Capacitance 6 pF VCC = 5.0V = BE CI/O (ON) Switch ON Capacitance 12 pF VCC = 5.0V, BE = 0V AC Loading and Waveforms Input driven by 50Ω source terminated in 50Ω. CL includes load and stray capacitance. Input PRR = 1.0 MHz tw = 500 ns. FIGURE 1. AC Test Circuit FIGURE 2. AC Waveforms 3 www.fairchildsemi.com FST3306 AC Electrical Characteristics FST3306 DC Characteristics FIGURE 3. Typical High Level Output Voltage vs. Supply Voltage www.fairchildsemi.com 4 FST3306 2-Bit Low Power Bus Switch Physical Dimensions inches (millimeters) unless otherwise noted 8-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Package Number MTC08 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