Revised February 2001 74LCX244 Low Voltage Buffer/Line Driver with 5V Tolerant Inputs and Outputs General Description Features The LCX244 contains eight non-inverting buffers with 3-STATE outputs. The device may be employed as a memory address driver, clock driver and bus-oriented transmitter/receiver. The LCX244 is designed for low voltage (2.5V or 3.3V) VCC applications with capability of interfacing to a 5V signal environment. ■ 5V tolerant inputs and outputs The LCX244 is fabricated with an advanced CMOS technology to achieve high speed operation while maintaining CMOS low power dissipation. ■ 2.3V–3.6V VCC specifications provided ■ 6.5 ns tPD max (VCC = 3.3V), 10 µA ICC max ■ Power down high impedance inputs and outputs ■ Supports live insertion/withdrawal (Note 1) ■ ±24 mA output drive (VCC = 3.0V) ■ Implements patented noise/EMI reduction circuitry ■ Latch-up performance exceeds 500 mA ■ 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 74LCX244WM 74LCX244SJ M20B M20D Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 74LCX244MSA MSA20 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide 74LCX244MTC 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 IEEE/IEC © 2001 Fairchild Semiconductor Corporation DS500107 www.fairchildsemi.com 74LCX244 Low Voltage Buffer/Line Driver with 5V Tolerant Inputs and Outputs February 1994 74LCX244 Pin Descriptions Pin Names Description OE1, OE2 3-STATE Output Enable Inputs I0–I7 Inputs O0–O7 Outputs Truth Tables Inputs Outputs OE1 In (Pins 12, 14, 16, 18) L L L L H H H X Z Inputs Outputs OE2 In (Pins 3, 5, 7, 9) L L L L H H H X Z H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Z = High Impedance www.fairchildsemi.com 2 Symbol Parameter Value Conditions 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 Units V V Output in 3-STATE −0.5 to VCC + 0.5 V Output in HIGH or LOW State (Note 3) IIK DC Input Diode Current −50 VI < GND IOK DC Output Diode Current −50 VO < GND +50 VO > VCC 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 4) 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 0 5.5 HIGH or LOW State 0 VCC 3-STATE 0 5.5 Output Current 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 = 2.3V–2.7V ±8 Units V V V mA −40 85 °C 0 10 ns/V Note 2: 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 3: IO Absolute Maximum Rating must be observed. Note 4: Unused inputs or I/Os 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 Units V VCC − 0.2 IOH = −8 mA 2.3 1.8 IOH = −12 mA 2.7 2.2 IOH = −18 mA 3.0 2.4 IOH = −24 mA 3.0 2.2 IOL = 100 µA 2.3 − 3.6 0.2 IOL = 8 mA 2.3 0.6 IOL = 12 mA 2.7 0.4 IOL = 16 mA 3.0 0.4 V V IOL = 24 mA 3.0 0.55 II Input Leakage Current 0 ≤ VI ≤ 5.5V 2.3 − 3.6 ±5.0 µA IOZ 3-STATE Output Leakage 0 ≤ VO ≤ 5.5V 2.3 − 3.6 ±5.0 µA 0 10 µA VI = VIH or VIL IOFF Power-Off Leakage Current VI or VO = 5.5V 3 www.fairchildsemi.com 74LCX244 Absolute Maximum Ratings(Note 2) 74LCX244 DC Electrical Characteristics Symbol (Continued) Parameter VCC Conditions TA = −40°C to +85°C (V) ICC ∆ICC Quiescent Supply Current Increase in ICC per Input Min Units Max VI = VCC or GND 2.3 − 3.6 10 3.6V ≤ VI, VO ≤ 5.5V (Note 5) 2.3 − 3.6 ±10 VIH = VCC −0.6V 2.3 − 3.6 500 µA µA Note 5: 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 ± 0.2 CL= 50 pF CL = 50 pF CL = 30 pF Min Max Min Max Min tPHL Propagation Delay 1.5 6.5 1.5 7.5 1.5 7.8 tPLH Data to Output 1.5 6.5 1.5 7.5 1.5 7.8 tPZL Output Enable Time 1.5 8.0 1.5 9.0 1.5 10.0 1.5 8.0 1.5 9.0 1.5 10.0 1.5 7.0 1.5 8.0 1.5 8.4 1.5 7.0 1.5 8.0 1.5 8.4 tPZH tPLZ Output Disable Time tPHZ tOSHL tOSLH Output to Output Skew (Note 6) Units Max 1.0 ns ns ns ns 1.0 Note 6: 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 VCC TA = 25°C (V) Typical CL = 50 pF, VIH = 3.3V, VIL = 0V 3.3 0.8 CL = 30 pF, VIH = 2.5V, VIL = 0V 2.5 0.6 CL = 50 pF, VIH = 3.3V, VIL = 0V 3.3 −0.8 CL = 30 pF, VIH = 2.5V, VIL = 0V 2.5 −0.6 Parameter Quiet Output Dynamic Peak VOL Quiet Output Dynamic Valley VOL Conditions Units V V Capacitance Typical Units CIN Symbol Input Capacitance Parameter VCC = Open, VI = 0V or VCC 7 pF COUT 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 74LCX244 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 74LCX244 Schematic Diagram Generic for LCX Family FIGURE 3. www.fairchildsemi.com 6 74LCX244 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 74LCX244 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 74LCX244 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 74LCX244 Low Voltage Buffer/Line Driver 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 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