Revised October 2000 74LCXZ2245 Low Voltage Bidirectional Transceiver with 5V Tolerant Inputs and Outputs and 26Ω Series Resistors in B Outputs General Description Features The LCXZ2245 contains eight non-inverting bidirectional buffers with 3-STATE outputs and is intended for bus oriented applications. The device is designed for low voltage (2.7V 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 in the B Port output helps reduce output overshoot and undershoot. ■ 5V tolerant inputs and outputs The LCXZ2245 is fabricated with an advanced CMOS technology to achieve high speed operation while maintaining CMOS low power dissipation. ■ Latch-up performance exceeds 500 mA When VCC is between 0 and 1.5V, the LCXZ2245 is on the high impedance state during power up or power down. This places the outputs in the high impedance (Z) state preventing intermittent low impedance loading or glitching in bus oriented applications. ■ 2.7V–3.6V VCC specifications provided ■ 7.0 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 on the B Port (VCC = 3.0V) ■ Implements patented noise/EMI reduction circuitry ■ Equivalent 26Ω series resistor on all B Port 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 74LCXZ2245WM M20B 74LCXZ2245SJ 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 74LCXZ2245MSA MSA20 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide 74LCXZ2245MTC 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 DS500410 www.fairchildsemi.com 74LCXZ2245 Low Voltage Bidirectional Transceiver with 5V Tolerant Inputs and Outputs and 26Ω Series Resistors in B Outputs October 2000 74LCXZ2245 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 Parameter VCC Supply Voltage VI Input Voltage VO Output Voltage IOH/IOL Min Max 2.7 3.6 V 0 5.5 V HIGH or LOW State 0 VCC 3-STATE 0 5.5 Operating Output Current in IOH/IOL - A Outputs Output Current in IOH/IOL - B Outputs TA Free-Air Operating Temperature ∆t/∆V Input Edge Rate, VIN = 0.8V − 2.0V, VCC = 3.0V VCC = 3.0V − 3.6V ±24 VCC = 2.7V − 3.0V ±12 VCC = 3.0V − 3.6V ±12 VCC = 2.7V − 3.0V ±8 Units V mA 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 Parameter Conditions VCC TA = −40°C to +85°C (V) Min 2.0 VIH HIGH Level Input Voltage 2.7 - 3.6 VIL LOW Level Input Voltage 2.7 - 3.6 VOH HIGH Level Output Voltage B Outputs HIGH Level Output Voltage A Outputs IOH = −100 µA 2.7 - 3.6 VCC − 0.2 IOH = −4 mA 2.7 2.2 3.0 2.4 IOH = −8 mA 2.7 2.0 IOH = −12 mA 3.0 2.0 IOH = −100 µA 2.7 - 3.6 VCC − 0.2 IOH = −12 mA 2.7 2.2 IOH = −18 mA 3.0 2.4 IOH = −24 mA 3.0 2.2 Units V 0.8 IOH = −6 mA 3 Max V V www.fairchildsemi.com 74LCXZ2245 Absolute Maximum Ratings(Note 3) 74LCXZ2245 DC Electrical Characteristics Symbol VOL Parameter (Continued) Conditions VCC TA = −40°C to +85°C (V) Min LOW Level Output Voltage IOL = 100 µA B Outputs IOL = 4 mA 2.7 0.4 IOL = 6 mA 3.0 0.55 LOW Level Output Voltage A Outputs 2.7 - 3.6 0.2 IOL = 8 mA 2.7 0.6 IOL = 12 mA 3.0 0.8 IOL = 100 µA 2.7 - 3.6 0.2 0.4 IOL = 12 mA 2.7 3.0 0.4 IOL = 24 mA 3.0 0.55 2.7 - 3.6 ±5.0 µA 2.7 - 3.6 ±5.0 µA 0 10 µA 0 - 1.5 ±5.0 µA Input Leakage Current 0 ≤ VI ≤ 5.5V IOZ 3-STATE I/O Leakage 0 ≤ VO ≤ 5.5V IOFF Power-Off Leakage Current VI or VO = 5.5V IPU/PD Power Up/Down VO = 0.5V to VCC 3-STATE Output Current VI = VCC or GND Quiescent Supply Current VI = VCC or GND 2.7 - 3.6 225 3.6V ≤ VI, VO ≤ 5.5V (Note 6) 2.7 - 3.6 ±225 VIH = VCC −0.6V 2.7 - 3.6 500 VI = VIH or VIL ∆ICC Increase in ICC per Input V IOL = 16 mA II ICC Units Max µA µA Note 6: Outputs disabled or 3-STATE only. AC Electrical Characteristics TA = −40°C to +85°C, RL = 500Ω Symbol Parameter tPHL Propagation Delay tPLH A to B tPHL Propagation Delay tPLH B to A tPZL Output Enable Time tPZH A to B tPZL Output Enable Time tPZH B to A tPLZ Output Disable Time tPHZ A to B tPLZ Output Disable Time tPHZ B to A tOSHL Output to Output Skew tOSLH (Note 7) VCC = 3.3V ± 0.3V VCC = 2.7V CL = 50 pF CL = 50 pF Units Min Max Min Max 1.5 8.0 1.5 9.0 1.5 7.0 1.5 8.0 1.5 9.5 1.5 10.5 ns 1.5 8.5 1.5 9.5 ns 1.5 7.5 1.5 8.5 ns 1.5 7.5 1.5 8.5 ns 1.0 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). www.fairchildsemi.com 4 Symbol VOLP Parameter Quiet Output Dynamic Peak VOL B to A Quiet Output Dynamic Peak VOL A to B VOLV Quiet Output Dynamic Valley VOL B to A Quiet Output Dynamic Valley VOL A to B Conditions VCC (V) TA = 25°C Typical CL = 50 pF, VIH = 3.3V, VIL = 0V 3.3 0.8 CL = 50 pF, VIH = 3.3V, VIL = 0V 3.3 0.5 CL = 50 pF, VIH = 3.3V, VIL = 0V 2.5 −0.8 CL = 50 pF, VIH = 3.3V, VIL = 0V 3.3 −0.5 Units V V Capacitance Typical Units CIN Symbol Input Capacitance Parameter VCC = Open, VI = 0V or VCC Conditions 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 5 www.fairchildsemi.com 74LCXZ2245 Dynamic Switching Characteristics 74LCXZ2245 AC LOADING and WAVEFORMS Generic for LCX Family FIGURE 1. AC Test Circuit (CL includes probe and jig capacitance) VI CL 6V for VCC = 3.3V, 2.7V 50 pF 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) VCC Symbol www.fairchildsemi.com 3.3V ± 0.3V 2.7V Vmi 1.5V 1.5V Vmo 1.5V 1.5V Vx VOL + 0.3V VOL + 0.3V Vy VOH − 0.3V VOH − 0.3V 6 74LCXZ2245 Schematic Diagram Generic for LCX Family 7 www.fairchildsemi.com 74LCXZ2245 Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide Package Number M20B www.fairchildsemi.com 8 74LCXZ2245 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M20D 9 www.fairchildsemi.com 74LCXZ2245 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide Package Number MSA20 www.fairchildsemi.com 10 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 11 www.fairchildsemi.com 74LCXZ2245 Low Voltage Bidirectional Transceiver with 5V Tolerant Inputs and Outputs and 26Ω Series Resistors in B Outputs Physical Dimensions inches (millimeters) unless otherwise noted (Continued)