Revised October 2000 74LCXR2245 Low Voltage Bidirectional Transceiver with 5V Tolerant Inputs and Outputs and 26Ω Series Resistors on Both A and B Ports General Description Features The LCXR2245 contains eight non-inverting bidirectional buffers with 3-STATE outputs and is intended for bus oriented applications. The device is designed for low voltage (2.5V and 3.3V) VCC applications with capability of interfacing to a 5V signal environment. The T/R input determines the direction of data flow through the device. The OE input disables both the A and B ports by placing them in a high impedance state. The 26Ω series resistor helps reduce output overshoot and undershoot. ■ 5V tolerant inputs and outputs The LCXR2245 is fabricated with an advanced CMOS technology to achieve high speed operation while maintaining CMOS low power dissipation. ■ Latch-up performance exceeds 500 mA ■ 2.3V–3.6V VCC specifications provided ■ 8.0 ns tPD max (VCC = 3.3V), 10 µA ICC max ■ Power down high impedance inputs and outputs ■ Supports live insertion/withdrawal (Note 1) ■ ±12 mA output drive (VCC = 3.0V) ■ Implements patented noise/EMI reduction circuitry ■ Equivalent 26Ω series resistor on all outputs ■ ESD performance: Human body model > 2000V Machine model > 200V Note 1: To ensure the high-impedance state during power up or down, OE should be tied to VCC through a pull-up resistor: the minimum value or the resistor is determined by the current-sourcing capability of the driver. Ordering Code: Order Number Package Number 74LCXR2245WM M20B 74LCXR2245SJ Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 74LCXR2245MSA MSA20 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide 74LCXR2245MTC MTC20 20-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 Pin Descriptions Pin Names Description OE Output Enable Input T/R Transmit/Receive Input A0–A7 Side A Inputs or 3-STATE Outputs B0–B7 Side B Inputs or 3-STATE Outputs © 2000 Fairchild Semiconductor Corporation DS500361 www.fairchildsemi.com 74LCXR2245 Low Voltage Bidirectional Transceiver with 5V Tolerant Inputs and Outputs and 26Ω Series Resistors on Both A and B Ports October 2000 74LCXR2245 Truth Table Inputs Outputs OE T/R L L Bus B0 – B7 Data to Bus A0 – A7 L H Bus A0 – A7 Data to Bus B0 – B7 H X HIGH Z State on A0 – A7, B0 – B7 (Note 2) H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Z = High Impedance Note 2: Unused bus terminals during HIGH Z State must be held HIGH or LOW. Logic Diagram www.fairchildsemi.com 2 Symbol Parameter Value VCC Supply Voltage −0.5 to +7.0 VI DC Input Voltage −0.5 to +7.0 VO DC Output Voltage −0.5 to +7.0 Conditions Units V V Output in 3-STATE −0.5 to VCC + 0.5 Output in HIGH or LOW State (Note 4) IIK DC Input Diode Current −50 VI < GND IOK DC Output Diode Current −50 VO < GND +50 VO > VCC V mA mA IO DC Output Source/Sink Current ±50 mA ICC DC Supply Current per Supply Pin ±100 mA IGND DC Ground Current per Ground Pin ±100 mA TSTG Storage Temperature −65 to +150 °C Recommended Operating Conditions (Note 5) Symbol VCC Parameter VI Input Voltage VO Output Voltage IOH/IOL Min Max Operating 2.0 3.6 Data Retention 1.5 3.6 Supply Voltage Output Current TA Free-Air Operating Temperature ∆t/∆V Input Edge Rate, VIN = 0.8V − 2.0V, VCC = 3.0V 0 5.5 HIGH or LOW State 0 VCC 3-STATE 0 5.5 VCC = 3.0V − 3.6V ±12 VCC = 2.7V - 3.0V ±8 VCC = 2.3V - 2.7V ±4 Units V V V mA −40 85 °C 0 10 ns/V 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 Ratings. The “Recommended Operating Conditions” table will define the conditions for actual device operation. Note 4: IO Absolute Maximum Rating must be observed. Note 5: Unused inputs or I/O pins must be held HIGH or LOW. They may not float. DC Electrical Characteristics Symbol VIH VIL VOH VOL Parameter Conditions HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Voltage LOW Level Output Voltage IOH = −100 µA VCC TA = −40°C to +85°C (V) Min 2.3 − 2.7 1.7 2.7 − 3.6 2.0 Max V 2.3 − 2.7 0.7 2.7 - 3.6 0.8 2.3 - 3.6 VCC − 0.2 IOH = −4 mA 2.3 1.8 IOH = −4 mA 2.7 2.2 IOH = −6 mA 3.0 2.4 IOH = −8 mA 2.7 2.0 IOH = −12 mA 3.0 2.0 IOL = 100 µA Units V V 2.3 − 3.6 0.2 IOL = 4 mA 2.3 0.6 IOL = 4 mA 2.7 0.4 IOL = 6 mA 3.0 0.55 V IOL = 8 mA 2.7 0.6 IOL = 12 mA 3.0 0.8 2.3 − 3.6 ±5.0 µA 2.3 − 3.6 ±5.0 µA II Input Leakage Current 0 ≤ VI ≤ 5.5V IOZ 3-STATE I/O Leakage 0 ≤ VO ≤ 5.5V VI = VIH or VIL 3 www.fairchildsemi.com 74LCXR2245 Absolute Maximum Ratings(Note 3) 74LCXR2245 DC Electrical Characteristics Symbol Parameter (Continued) Conditions VCC TA = −40°C to +85°C (V) Min IOFF Power-Off Leakage Current VI or VO = 5.5V 0 10 ICC Quiescent Supply Current VI = VCC or GND 2.3 − 3.6 10 3.6V ≤ VI, VO ≤ 5.5V (Note 6) 2.3 − 3.6 ±10 VIH = V CC −0.6V 2.3 - 3.6 500 ∆ICC Increase in ICC per Input Units Max µA µA µA Note 6: Outputs disabled or 3-STATE only. AC Electrical Characteristics TA = −40°C to +85°C, RL = 500Ω Symbol Parameter VCC = 3.3V ± 0.3V VCC = 2.7V VCC = 2.5V ± 0.2V CL = 50 pF CL = 50 pF CL = 30 pF Min Max Min Max Min tPHL Propagation Delay 1.5 8.0 1.5 9.0 1.5 9.6 tPLH An to Bn or Bn to An 1.5 8.0 1.5 9.0 1.5 9.6 tPZL Output Enable Time 1.5 9.5 1.5 10.5 1.5 11.0 1.5 9.5 1.5 10.5 1.5 11.0 tPZH tPLZ Output Disable Time tPHZ Max 1.5 7.5 1.5 8.5 1.5 9.0 1.5 7.5 1.5 8.5 1.5 9.0 tOSHL Output to Output Skew 1.0 tOSLH (Note 7) 1.0 Units ns ns ns ns Note 7: Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device. The specification applies to any outputs switching in the same direction, either HIGH-to-LOW (tOSHL) or LOW-to-HIGH (tOSLH). Dynamic Switching Characteristics Symbol VOLP VOLV Parameter Quiet Output Dynamic Peak VOL Quiet Output Dynamic Valley VOL Conditions VCC (V) TA = 25°C Units Typical CL = 50 pF, VIH = 3.3V, VIL = 0V 3.3 0.5 CL = 30 pF, VIH = 2.5V, VIL = 0V 2.5 0.4 CL = 50 pF, VIH = 3.3V, V IL = 0V 3.3 0.5 CL = 30 pF, VIH = 2.5V, VIL = 0V 2.5 0.4 V V Capacitance Typical Units CIN Symbol Input Capacitance Parameter VCC = Open, VI = 0V or VCC 7 pF CI/O Input/Output Capacitance VCC = 3.3V, VI = 0V or VCC 8 pF CPD Power Dissipation Capacitance VCC = 3.3V, VI = 0V or VCC, f = 10 MHz 25 pF www.fairchildsemi.com Conditions 4 74LCXR2245 AC LOADING and WAVEFORMS Generic for LCX Family FIGURE 1. AC Test Circuit (CL includes probe and jig capacitance) Test Switch tPLH, tPHL Open tPZL, tPLZ 6V at VCC = 3.3 ± 0.3V VCC x 2 at VCC = 2.5 ± 0.2V tPZH,tPHZ GND Waveform for Inverting and Non-Inverting Functions 3-STATE Output High Enable and Disable Times for Logic Propagation Delay. Pulse Width and trec Waveforms Setup Time, Hold Time and Recovery Time for Logic trise and tfall 3-STATE Output Low Enable and Disable Times for Logic FIGURE 2. Waveforms (Input Characteristics; f =1MHz, tR = tF = 3ns) Symbol VCC 3.3V ± 0.3V 2.7V 2.5V ± 0.2V Vmi 1.5V 1.5V VCC/2 Vmo 1.5V 1.5V VCC/2 Vx VOL + 0.3V VOL + 0.3V VOL + 0.15V Vy VOH − 0.3V VOH − 0.3V VOH − 0.15V 5 www.fairchildsemi.com 74LCXR2245 Schematic Diagram Generic for LCX Family www.fairchildsemi.com 6 74LCXR2245 Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide Package Number M20B 7 www.fairchildsemi.com 74LCXR2245 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M20D www.fairchildsemi.com 8 74LCXR2245 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide Package Number MSA20 9 www.fairchildsemi.com 74LCXR2245 Low Voltage Bidirectional Transceiver with 5V Tolerant Inputs and Outputs and 26Ω Series Resistors on Both A and B Ports Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Package Number MTC20 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 www.fairchildsemi.com 10