Revised November 2001 74VCX245 Low Voltage Bidirectional Transceiver with 3.6V Tolerant Inputs and Outputs General Description Features The VCX245 contains eight non-inverting bidirectional buffers with 3-STATE outputs and is intended for bus oriented applications. The T/R input determines the direction of data flow. The OE input disables both the A and B ports by placing them in a high impedance state. ■ 1.4V to 3.6V VCC supply operation ■ 3.6V tolerant inputs and outputs ■ Power-off high impedance inputs and outputs ■ Supports Live Insertion and Withdrawal (Note 1) The 74VCX245 is designed for low voltage (1.4V to 3.6V) VCC applications with I/O compatibility up to 3.6V. ■ tPD The 74VCX245 is fabricated with an advanced CMOS technology to achieve high-speed operation while maintaining low CMOS power dissipation. ■ Static Drive (IOH/IOL) 3.5 ns max for 3.0V to 3.6V VCC ±24 mA @ 3.0V VCC ■ Uses patented noise/EMI reduction circuitry ■ Latchup performance exceeds 300 mA ■ ESD performance: Human body model > 2000V Machine model > 200V Note 1: To ensure the high impedance state during power up and power down, OEn should be tied to VCC through a pull up resistor. The minimum value of the resistor is determined by the current sourcing capability of the driver. Ordering Code: Order Number Package Number 74VCX245WM M20B 74VCX245MTC MTC20 Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" 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 Pin Descriptions Pin Names © 2001 Fairchild Semiconductor Corporation ds500167 Description OE Output Enable Input (Active LOW) T/R Transmit/Receive Input A0–A7 Side A Inputs or 3-STATE Outputs B0–B7 Side B Inputs or 3-STATE Outputs www.fairchildsemi.com 74VCX245 Low Voltage Bidirectional Transceiver with 3.6V Tolerant Inputs and Outputs June 1999 74VCX245 Connection Diagram Truth Table Inputs OE Outputs 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 Recommended Operating Conditions (Note 5) Supply Voltage (VCC) −0.5V to +4.6V DC Input Voltage (VI) −0.5V to +4.6V Power Supply Operating 1.4V to 3.6V −0.5V to +4.6V Input Voltage −0.3V to 3.6V DC Output Voltage (VO) Outputs 3-STATE Outputs Active (Note 4) −0.5V to VCC + 0.5V DC Input Diode Current (IIK) VI < 0V Output Voltage (VO) −50 mA DC Output Diode Current (IOK) Output in Active States 0V to VCC Output in 3-STATE 0V to 3.6V VO < 0V −50 mA VO > VCC +50 mA VCC = 3.0V to 3.6V ±24 mA ±50 mA VCC = 2.3V to 2.7V ±18 mA VCC = 1.65V to 2.3V ±6 mA DC Output Source/Sink Current Output Current in IOH/IOL (IOH/IOL) ±100 mA DC VCC or Ground Current Storage Temperature (TSTG) VCC = 1.4V to 1.6V −65°C to +150 °C ±2 mA Free Air Operating Temperature (TA) −40°C to +85°C Minimum Input Edge Rate (∆t/∆V) VIN = 0.8V to 2.0V, VCC = 3.0V 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: Floating or unused inputs must be held HIGH or LOW. DC Electrical Characteristics Symbol VIH VIL Parameter Conditions HIGH Level Input Voltage VCC (V) 2.7 - 3.6 LOW Level Input Voltage Min HIGH Level Output Voltage 1.6 1.65 - 2.3 0.65 × VCC 1.4 - 1.6 0.65 × VCC 2.7–3.6 0.8 0.7 1.65−2.3 0.35 × V CC VCC − 0.2 IOH = −12 mA 2.7 2.2 IOH = −18 mA 3.0 2.4 IOH = −24 mA 3.0 2.2 IOH = −100 µA 2.3–2.7 VCC − 0.2 IOH = −6 mA 2.3 2.0 IOH = −12 mA 2.3 1.8 IOH = −18 mA 2.3 1.7 IOH = −100 µA 1.65−2.3 VCC − 0.2 IOH = −2 mA 3 V 0.35 × V CC 2.7–3.6 IOH = −100 µA V 2.3–2.7 IOH = −100 µA IOH = −6 mA Units 2.0 2.3 - 2.7 1.4 - 1.6 VOH Max 1.65 1.25 1.4 - 1.6 VCC − 0.2 1.4 1.05 V www.fairchildsemi.com 74VCX245 Absolute Maximum Ratings(Note 3) 74VCX245 DC Electrical Characteristics Symbol (Continued) Parameter VCC Conditions Min Max Units (V) VOL LOW Level Output Voltage IOL = 100 µA 2.7–3.6 0.2 IOL = 12 mA 2.7 0.4 IOL = 18 mA 3.0 0.4 IOL = 24 mA 3.0 0.55 IOL = 100 µA 2.3–2.7 0.2 IOL = 12 mA 2.3 0.4 IOL = 18 mA 2.3 0.6 IOL = 100 µA 1.65−2.3 0.2 1.65 0.3 IOL = 6 mA IOL = 100 µA V 1.4 - 1.6 0.2 1.4 0.35 1.4–3.6 ±5.0 µA 1.4–3.6 ±10 µA 0 10 µA IOL = 2 mA II Input Leakage Current 0 ≤ VI ≤ 3.6V IOZ 3-STATE Output Leakage 0 ≤ VO ≤ 3.6V IOFFI Power-OFF Leakage Current 0 ≤ (VI, VO) ≤ 3.6V ICC Quiescent Supply Current VI = VCC or GND 1.4–3.6 20 VCC ≤ (VI, VO) ≤ 3.6V (Note 6) 1.4–3.6 ±20 VIH = VCC −0.6V 2.7–3.6 750 VI = VIH or VIL ∆ICC Increase in ICC per Input µA µA Note 6: Outputs disabled or 3-STATE only. AC Electrical Characteristics Symbol tPHL, tPLH Parameter Propagation Delay (Note 7) Conditions CL = 30 pF, RL = 500Ω An to Bn or Bn to An tPZL, tPZH tPLZ, tPHZ Output Enable Time Output Disable Time tOSHL Output to Output Skew tOSLH (Note 8) VCC TA = −40°C to +85°C (V) Min Max 3.3 ± 0.3 0.6 3.5 2.5 ± 0.2 0.8 4.2 1.8 ± 0.15 1.5 8.4 CL = 15 pF, RL = 2kΩ 1.5 ± 0.1 1.0 16.8 CL = 30 pF, RL = 500Ω 3.3 ± 0.3 0.6 4.5 2.5 ± 0.2 0.8 5.6 1.8 ± 0.15 1.5 9.8 CL = 15 pF, RL = 2kΩ 1.5 ± 0.1 1.0 19.6 CL = 30 pF, RL = 500Ω 3.3 ± 0.3 0.6 3.6 2.5 ± 0.2 0.8 4.0 1.8 ± 0.15 1.5 7.2 CL = 15 pF, RL = 2kΩ 1.5 ± 0.1 1.0 14.4 CL = 30 pF, RL = 500Ω 3.3 ± 0.3 CL = 15 pF, RL = 2kΩ Units Figure Number ns Figures 1, 2 Figures 5, 6 ns Figures 1, 3, 4 Figures 5, 7, 8 ns Figures 1, 3, 4 Figures 5, 7, 8 0.5 2.5 ± 0.2 0.5 1.8 ± 0.15 0.75 1.5 ± 0.1 1.5 ns Note 7: For CL = 50PF, add approximately 300 ps to the AC maximum specification. Note 8: 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 VOLV VOHV Parameter Quiet Output Dynamic Peak VOL Quiet Output Dynamic Valley VOL Quiet Output Dynamic Valley VOH Conditions CL = 30 pF, VIH = VCC, VIL = 0V CL = 30 pF, VIH = VCC, V IL = 0V CL = 30 pF, VIH = VCC, V IL = 0V VCC (V) TA = 25°C Typical 1.8 0.3 2.5 0.7 3.3 1.0 1.8 −0.3 2.5 −0.7 3.3 −1.0 1.8 1.3 2.5 1.7 3.3 2.0 Units V V V Capacitance Symbol Parameter Conditions TA = +25°C Typical Units CIN Input Capacitance VI = 0V or VCC, VCC = 1.8V, 2.5V or 3.3V 6 CI/O Input/Output Capacitance VI = 0V or VCC, VCC = 1.8V, 2.5V or 3.3V 7 pF CPD Power Dissipation Capacitance VI = 0V or VCC, f = 10 MHz, VCC = 1.8V, 2.5V or 3.3V 20 pF 5 pF www.fairchildsemi.com 74VCX245 Dynamic Switching Characteristics 74VCX245 AC Loading and Waveforms (VCC 3.3V ± 0.3V to 1.8V ± 0.15V) FIGURE 1. AC Test Circuit TEST SWITCH tPLH, tPHL Open tPZL, tPLZ 6V at VCC = 3.3 ± 0.3V; VCC x 2 at VCC = 2.5V ± 0.2V; 1.8V ± 0.15V tPZH, tPHZ GND FIGURE 2. Waveform for Inverting and Non-inverting Functions FIGURE 3. 3-STATE Output High Enable and Disable Times for Low Voltage Logic FIGURE 4. 3-STATE Output Low Enable and Disable Times for Low Voltage Logic Symbol www.fairchildsemi.com VCC 3.3V ± 0.3V 2.5V ± 0.2V 1.8V ± 0.15V Vmi 1.5V VCC/2 VCC/2 Vmo 1.5V VCC/2 VCC/2 VX VOL + 0.3V VOL + 0.15V VOL + 0.15V VY VOH − 0.3V VOH − 0.15V VOH − 0.15V 6 74VCX245 AC Loading and Waveforms (VCC 1.5 ± 0.1V) TEST SWITCH tPLH, tPHL Open tPZL, tPLZ VCC x 2 at VCC = 1.5 ± 0.1V tPZH, tPHZ GND FIGURE 5. AC Test Circuit FIGURE 6. Waveform for Inverting and Non-Inverting Functions FIGURE 7. 3-STATE Output High Enable and Disable Times for Low Voltage Logic FIGURE 8. 3-STATE Output Low Enable and Disable Times for Low Voltage Logic VCC Symbol 1.5V ± 0.1V VCC/2 Vmi Vmo VCC/2 VX VOL + 0.1V VY VOH − 0.1V 7 www.fairchildsemi.com 74VCX245 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 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 9 www.fairchildsemi.com 74VCX245 Low Voltage Bidirectional Transceiver with 3.6V Tolerant Inputs and Outputs Physical Dimensions inches (millimeters) unless otherwise noted (Continued)