Description
74LCX245 Low Voltage Bidirectional Transceiver with 5V Tolerant Inputs and Outputs February 1994 Revised May 1999 74LCX245 Low Voltage Bidirectional Transceiver with 5V Tolerant Inputs and Outputs General Description The LCX245 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 LCX245 is fabricated with an advanced CMOS technology to achieve high speed operation while maintaining CMOS low power dissipation. Features s 5V tolerant inputs and outputs s 2.3V–3.6V VCC specifications provided s 7.0 ns tPD max (VCC = 3.3V), 10 µA ICC max s Power down high impedance inputs and outputs s Supports live insertion/withdrawal (Note 1) s ±24 mA output drive (VCC = 3.0V) s Implements patented noise/EMI reduction circuitry s Latch-up performance exceeds 500 mA s 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 74LCX245WM 74LCX245SJ 74LCX245MSA 74LCX245MTC Package Number M20B M20D MSA20 MTC20 Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide 20-Lead Small Outline Package (SOP), EIAJ Type II, 4.4mm Wide 20-Lead Shrink Small Outline Package (SSOP), EIAJ Type II, 5.3mm Wide 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 OE T/R A0–A7 B0–B7 Description Output Enable Input Transmit/Receive Input Side A Inputs or 3-STATE Outputs Side B Inputs or 3-STATE Outputs © 1999 Fairchild Semiconductor Corporation DS012006.prf www.fairchildsemi.com 74LCX245 Truth Table Inputs OE L L H 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. Outputs T/R L H X Bus B0 – B7 Data to Bus A0 – A7 Bus A0 – A7 Data to Bus B0 – B7 HIGH Z State on A0 – A7, B0 – B7 (Note 2) Logic Diagram www.fairchildsemi.com 2 74LCX245 Absolute Maximum Ratings(Note 3) Symbol VCC VI VO IIK IOK IO ICC IGND TSTG Parameter Supply Voltage DC Input Voltage DC Output Voltage DC Input Diode Current DC Output Diode Current DC Output Source/Sink Current DC Supply Current per Supply Pin DC Ground Current per Ground Pin Storage Temperature Value −0.5 to +7.0 −0.5 to +7.0 −0.5 to +7.0 −0.5 to VCC + 0.5 −50 −50 +50 ±50 ±100 ±100 −65 to +150 (Note 5) Min Operating Data Retention VI VO IOH/IOL Input Voltage Output Voltage Output Current HIGH or LOW State 3-STATE VCC = 3.0V − 3.6V VCC = 2.7V - 3.0V VCC = 2.3V - 2.7V TA ∆t/∆V Free-Air Operating Temperature Input Edge Rate, VIN = 0.8V − 2.0V, VCC = 3.0V −40 0 2.0 1.5 0 0 0 Max 3.6 3.6 5.5 VCC 5.5 ±24 ±12 ±8 85 10 °C ns/V mA Units V V V Output in 3-STATE Output in HIGH or LOW State (Note 4) VI < GND VO < GND VO > VCC Conditions Units V V V mA mA mA mA mA °C Recommended Operating Conditions Symbol VCC Supply Voltage Parameter 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 Parameter HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Voltage IOH = −100 µA IOH = −8 mA IOH = −12 mA IOH = −18 mA IOH = −24 mA VOL LOW Level Output Voltage IOL = 100 µA IOL = 8mA IOL = 12 mA IOL = 16 mA IOL = 24 mA II IOZ IOFF Input Leakage Current 3-STATE I/O Leakage Power-Off Leakage Current 0 ≤ VI ≤ 5.5V 0 ≤ VO ≤ 5.5V VI = VIH or VIL VI or VO = 5.5V 0 10 µA Conditions VCC (V) 2.3 − 2.7 2.7 − 3.6 2.3 − 2.7 2.7 - 3.6 2.3 - 3.6 2.3 2.7 3.0 3.0 2.3 − 3.6 2.3 2.7 3.0 3.0 2.3 − 3.6 2.3 − 3.6 VCC − 0.2 1.8 2.2 2.4 2.2 0.2 0.6 0.4 0.4 0.55 ±5.0 ±5.0 µA µA V V TA = −40°C to +85°C Min 1.7 2.0 0.7 0.8 Max V V Units 3 www.fairchildsemi.com 74LCX245 DC Electrical Characteristics Symbol ICC ∆ICC Parameter Quiescent Supply Current Increase in ICC per Input (Continued) VCC (V) 2.3 − 3.6 2.3 − 3.6 2.3 - 3.6 TA = −40°C to +85°C Min Max 10 ±10 500 µA µA Conditions VI = VCC or GND 3.6V ≤ VI, VO ≤ 5.5V (Note 6) VIH = VCC −0.6V Units 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 CL = 50 pF Min tPHL tPLH tPZL tPZH tPLZ tPHZ tOSHL tOSLH Output to Output Skew (Note 7) Output Disable Time Propagation Delay An to Bn or Bn to An Output Enable Time 1.5 1.5 1.5 1.5 1.5 1.5 Max 7.0 7.0 8.5 8.5 7.5 7.5 1.0 1.0 Min 1.5 1.5 1.5 1.5 1.5 1.5 VCC = 2.7V CL = 50 pF Max 8.0 8.0 9.5 9.5 8.5 8.5 Min 1.5 1.5 1.5 1.5 1.5 1.5 VCC = 2.5V ± 0.2V CL = 30 pF Max 8.4 8.4 10.5 10.5 9.0 9.0 ns ns ns ns Units 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 CL = 50 pF, VIH = 3.3V, VIL = 0V CL = 30 pF, VIH = 2.5V, VIL = 0V CL = 50 pF, VIH = 3.3V, V IL = 0V CL = 30 pF, VIH = 2.5V, VIL = 0V VCC (V) 3.3 2.5 3.3 2.5 TA = 25°C Typical 0.8 0.6 −0.8 −0.6 Units V V Capacitance Symbol CIN CI/O CPD Parameter Input Capacitance Input/Output Capacitance Power Dissipation Capacitance Conditions VCC = Open, VI = 0V or VCC VCC = 3.3V, VI = 0V or VCC VCC = 3.3V, VI = 0V or VCC, f = 10 MHz Typical 7 8 25 Units pF pF pF www.fairchildsemi.com 4 74LCX245 AC LOADING and WAVEFORMS Generic for LCX Family FIGURE 1. AC Test Circuit (CL includes probe and jig capacitance) Test tPLH, tPHL tPZL, tPLZ tPZH,tPHZ Switch Open 6V at VCC = 3.3 ± 0.3V VCC x 2 at VCC = 2.5 ± 0.2V 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 3-STATE Output Low Enable and Disable Times for Logic FIGURE 2. Waveforms (Input Characteristics; f =1MHz, tR = tF = 3ns) Symbol Vmi Vmo Vx Vy VCC 3.3V ± 0.3V 1.5V 1.5V VOL + 0.3V VOH − 0.3V 2.7V 1.5V 1.5V VOL + 0.3V VOH − 0.3V trise and tfall 2.5V ± 0.2V VCC/2 VCC/2 VOL + 0.15V VOH − 0.15V 5 www.fairchildsemi.com 74LCX245 Schematic Diagram Generic for LCX Family www.fairchildsemi.com 6 74LCX245 Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide Package Number M20B 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 4.4mm Wide Package Number M20D 7 www.fairchildsemi.com 74LCX245 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 8 74LCX245 Low Voltage Bidirectional Transceiver with 5V Tolerant Inputs and Outputs 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 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. 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 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.

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74LCX245MSA

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