Revised June 1999 74VCXH245 Low Voltage Bidirectional Transceiver with Bushold General Description Features The VCXH245 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. The VCXH245 data inputs include active bushold circuitry, eliminating the need for external pull-up resistors to hold unused or floating data inputs at a valid logic level. The 74VCXH245 is designed for low voltage (1.65V to 3.6V) VCC applications. The 74VCXH245 is fabricated with an advanced CMOS technology to achieve high-speed operation while maintaining low CMOS power dissipation. ■ 1.65V-3.6V VCC supply operation ■ Bushold on data inputs eliminates the need for external pull-up/pull-down resistors ■ tPD 3.5 ns max for 3.0V to 3.6V VCC 4.2 ns max for 2.3V to 2.7V VCC 8.4 ns max for 1.65V to 1.95V VCC ■ Static Drive (IOH/IOL) ±24 mA @ 3.0V VCC ±18 mA @ 2.3V VCC ± 6mA @ 1.65V VCC ■ Uses patented Quiet Series noise/EMI reduction circuitry ■ Latchup performance exceeds 300 mA ■ ESD performance: Human body model > 2000V Machine model > 200V Ordering Code: Order Number Package Number 74VCXH245WM M20B 74VCXH245MTC MTC20 Package Description 20-Lead Small Outline Integrated Circuit, JEDEC MS-013, 0.300” Wide Body 20-Lead Thin Shrink Small Outline Package, 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 Description OE Output Enable Input (Active LOW) T/R Transmit/Receive Input A0–A7 Side A Bushold Inputs or 3-STATE Outputs B0–B7 Side B Bushold Inputs or 3-STATE Outputs Quiet Series is a trademark of Fairchild Semiconductor Corporation. © 1999 Fairchild Semiconductor Corporation ds500198 www.fairchildsemi.com 74VCXH245 Low Voltage Bidirectional Transceiver with Bushold June 1999 74VCXH245 Connection Diagram 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 H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Z = High Impedance Logic Diagram www.fairchildsemi.com 2 Supply Voltage (VCC) Recommended Operating Conditions (Note 3) −0.5V to +4.6V DC Input Voltage (VI) Power Supply −0.5V to +4.6V T/R, OE Operating −0.5V to VCC+ 0.5V I/O Ports DC Output Voltage (VO)(Note 2) −0.5V to VCC + 0.5V DC Input Diode Current (IIK) VI < 0V 1.65V to 3.6V Data Retention Only 1.2V to 3.6V −0.3V to VCC Input Voltage −50 mA Output Voltage (VO) 0V to VCC Output Current in IOH/IOL DC Output Diode Current (IOK) VO < 0V −50 mA VCC = 3.0V to 3.6V ±24 mA VO > VCC +50 mA VCC = 2.3V to 2.7V ±18 mA VCC = 1.65V to 2.3V DC Output Source/Sink Current ±50 mA (IOH/IOL) ±100 mA DC VCC or Ground Current Storage Temperature (TSTG) ±6 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 −65°C to +150°C 10 ns/V Note 1: 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 2: IO Absolute Maximum Rating must be observed. Note 3: Floating or unused control inputs must be held HIGH or LOW. DC Electrical Characteristics Symbol (2.7V < VCC ≤ 3.6V) Parameter Conditions VCC (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 VOL LOW Level Output Voltage Units 0.8 V V 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 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 II Input Leakage Current VIN = VCC or GND II(HOLD) Bushold Input Minimum VIN = 0.8V II(OD) Max ±5.0 2.7–3.6 3.0 75 Drive Hold Current VIN = 2.0V 3.0 −75 Bushold Input Over-Drive (Note 4) 3.6 450 3.6 −450 Current to Change State (Note 5) IOZ 3-STATE Output Leakage VO = V CC or GND ICC Quiescent Supply Current ∆ICC Increase in ICC per Input V V µA µA µA 2.7–3.6 ±10 VI = V CC or GND 2.7–3.6 20 µA VIH = VCC −0.6V 2.7–3.6 750 µA VI = V IH or VIL µA Note 4: An external driver must source at least the specified current to switch from LOW-to-HIGH. Note 5: An external driver must sink at least the specified current to switch from HIGH-to-LOW. 3 www.fairchildsemi.com 74VCXH245 Absolute Maximum Ratings(Note 1) 74VCXH245 DC Electrical Characteristics Symbol (2.3V ≤ VCC ≤ .2.7V) Parameter Conditions VCC (V) Min 1.6 VIH HIGH Level Input Voltage 2.3–2.7 VIL LOW Level Input Voltage 2.3–2.7 VOH HIGH Level Output Voltage VOL LOW Level Output Voltage IOH = −100 µA 2.3–2.7 2.3 2.0 IOH = −12 mA 2.3 1.8 0.7 V V 1.7 V IOH = −18 mA 2.3 IOL = 100 µA 2.3–2.7 0.2 IOL = 12 mA 2.3 0.4 IOL = 18 mA 2.3 0.6 Input Leakage Current VIN = VCC or GND II(HOLD) Bushold Imput Minimum VIN = 0.7V 2.3 45 Drive Hold Current VIN = 1.6V 2.3 −45 IOZ Units VCC − 0.2 IOH = −6 mA II II(OD) Max ±5.0 2.3–2.7 Bushold Input Over-Drive (Note 6) 2.7 300 Current to Change State (Note 7) 2.7 −300 3-STATE Output Leakage VO = VCC or GND Quiescent Supply Current VI = VCC or GND µA µA µA 2.3–2.7 ±10 2.3–2.7 20 µA Max Units VI = VIH or VIL ICC V µA Note 6: An external driver must source at least the specified current to switch from LOW-to-HIGH. Note 7: An external driver must sink at least the specified current to switch from HIGH-to-LOW. DC Electrical Characteristics Symbol (1.65V ≤ VCC < 2.3V) Parameter Conditions VCC (V) Min 0.65 x VCC VIH HIGH Level Input Voltage 1.65–2.3 VIL LOW Level Input Voltage 1.65–2.3 VOH HIGH Level Output Voltage IOH = −100 µA VOL LOW Level Output Voltage II Input Leakage Current II(HOLD) Bushold Input Mimimum VIN = 0.57V 1.65 25 Drive Hold Current VIN = 1.07V 1.65 −25 Bushold Input Over−Drive (Note 8) 1.95 200 Current to Change State (Note 9) 1.95 −200 IOZ 3-STATE Output Leakage VO = VCC or GND 1.65–2.3 ±10 µA ICC Quiescent Supply Current VI = VCC or GND 1.65–2.3 20 µA 1.65–2.3 VCC − 0.2 IOH = −6 mA 1.65 1.25 IOL = 100 µA 1.65–2.3 IOL = 6 mA II(OD) VIN = VCC or GND Note 8: An external driver must source at least the specified current to switch from LOW-to-HIGH. Note 9: An external driver must sink at least the specified current to switch from HIGH-to-LOW. www.fairchildsemi.com 4 V 0.35 x VCC V V 0.2 1.65 0.3 1.65–2.3 ±5.0 V µA µA µA TA = −40°C to +85°C, CL = 30 pF, RL = 500Ω Symbol Parameter VCC = 3.3V ± 0.3V VCC = 2.5V ± 0.2V VCC = 1.8V ± 0.15V Min Max Min Max Min Max 0.6 3.5 0.8 4.2 1.5 8.4 tPHL Propagation Delay tPLH An to Bn or Bn to An tPZL Output Enable Time 0.6 4.5 0.8 5.6 1.5 9.8 Output Disable Time 0.6 3.6 0.8 4.0 1.5 7.2 tPZH tPLZ tPHZ tOSHL Output to Output Skew tOSLH (Note 11) 0.5 0.5 0.75 Units ns ns ns ns Note 10: For CL = 50 pF, add approximately 300 ps to the AC maximum specification. Note 11: 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 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 Units Typical 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 74VCXH245 AC Electrical Characteristics (Note 10) 74VCXH245 AC Loading and Waveforms 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 74VCXH245 Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead Small Outline Integrated Circuit, JEDEC MS-013, 0.300” Wide Body Package Number M20B 7 www.fairchildsemi.com 74VCXH245 Low Voltage Bidirectional Transceiver with Bushold Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Thin Shrink Small Outline Package, 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 8