Preliminary Revised May 2001 74LCXZR164245 16-Bit Dual Supply Translating Transceiver with 3-STATE Outputs and 26Ω Series Resistors in the Outputs (Preliminary) General Description The 74LCXZR164245 is a dual supply, 16-bit, translating transceiver that is designed for two-way asynchronous communication between busses at different supply voltages. This device is suited for PCMCIA and other real-time configurable I/O applications that utilize mixed power supplies. The 74LCXZR164245 is designed to Power-Up and Power-Down into a High Impedance state (outputs disabled). The feature eliminates the need to power-up in a specific sequence to avoid drawing excessive current. The A Port interfaces with the lower voltage bus (2.3V to 2.6V), and the B Port interfaces with the higher voltage bus (2.0V to 5.5V). This dual supply design allows for translation from low voltage busses (2.3V to 3.6V) to busses at a higher potential, up to 5.5V. The 74LCXZR164245 is intended to be used in applications where the A Port is connected to the 3.0V host system, and the B Port is connected to the PCMCIA card slots. Furthermore, when both OE’s are HIGH, the B Port I/O pins are disabled, and both B Port I/O connections and B Port VCC are allowed to float. This feature permits PCMCIA cards to be inserted and removed during normal operation. All A and B I/O include nominal 26Ω series resistors to reduce overshoot and undershoot. The Transmit/Receive (T/R) input determines the direction of data flow. Transmit (active-HIGH) enables data from A Ports to B Ports; Receive (active-LOW) enables data from B Ports to A Ports. The Output Enable (OE1, OE2) inputs, when HIGH, disable their associated ports by placing the I/Os in HIGH-Z condition. The 74LCXZR164245 is designed so that the control pins (T/Rn, OEn) are powered by VCCA, so that VCCB may be removed when the I/Os are disabled. The 74LCXZR164245 is suitable for mixed voltage applications such as notebook computers using a 3.3V CPU and 5.0V peripheral components. It is fabricated with an Advanced CMOS technology to achieve high speed operation while maintaining low CMOS power dissipation. Features ■ Bidirectional interface between 3V busses and 5V busses ■ Supports live insertion and withdrawal (Note 1) ■ Outputs source/sink up to 12 mA ■ All outputs include nominal 26Ω series resistors ■ Uses patented Quiet Series noise/EMI reduction circuitry ■ Functionally compatible with the 74 series 16245 ■ Port B I/O may be disabled by use of OEn or removal of B Port VCC ■ Port B VCC may be removed when OEn is used to disable I/O’s ■ Port B VCC removal may occur coincident with rising edge of OEn ■ Configurable as one 16-bit or two 8-bit transceivers ■ Unrestricted power-up sequencing 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 Package Description 74LCXZR164245MTD MTD48 48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide Devices also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code. Quiet Series is a trademark of Fairchild Semiconductor Corporation. © 2001 Fairchild Semiconductor Corporation DS500395 www.fairchildsemi.com 74LCXZR164245 16-Bit Dual Supply Translating Transceiver with 3-STATE Outputs and 26Ω Series Resistors in the Outputs (Preliminary) May 2001 74LCXZR164245 Preliminary Logic Symbol Pin Descriptions Pin Names Connection Diagram Description OEn Output Enable Input (Active LOW) T/Rn Transmit/Receive Input A0–A15 Side A Inputs or 3-STATE Outputs B0–B15 Side B Inputs or 3-STATE Outputs Truth Tables Inputs OE1 T/R1 Outputs L L L H Bus B0–B7 Data to Bus A0–A7 Bus A0–A7 Data to Bus B0–B7 H X HIGH Z State on A0–A7, B0–B7 Inputs OE2 T/R2 Outputs L L L H Bus B8–B15 Data to Bus A8–A15 Bus A8–A15 Data to Bus B8–B15 H X HIGH-Z State on A8–A15, B8–B15 H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial (HIGH or LOW, inputs may not float) Z = High Impedance LCXZR164245 Translator Power Up Note The LCXZR164245 Translator is designed with two separate VCC power rails. VCCB is the higher potential rail, operating at 3.0 to 5.5 volts, and VCCA is the lower potential rail, operating at 2.3 to 3.6 volts. The control pins of the device (OEn, T/Rn) are supplied by the VCCA rail. in a high impedance (Z) state prevents intermittent low impedance loading or glitching in bus oriented applications. To ensure the high impedance state during power up beyond a VCC of 1.5V and also during power down, the OEn pin should be tied to VCCA through a pull up resistor. The minimum value of this resistor is determined by the current-sourcing capability of the device driving the OEn pin. The LCXZR164245 will remain in high impedance mode (outputs are disabled) when VCCA and/or VCCB is between 0 volts and 1.5 volts during power up. Placing the outputs Logic Diagrams Note: Please note that these diagrams are provided only for the understanding of logic operations and should not be used to estimate propagation delays. www.fairchildsemi.com 2 Preliminary Symbol Parameter Value Conditions Units −0.5 to +7.0 VCCA, VCCB Supply Voltage V −0.5 to +7.0 VI DC Input Voltage VI/O DC Output Voltage OE, T/R Control Pins −0.5 to +7.0 V Outputs 3-STATE −0.5 to VCCA +0.5 A Outputs in HIGH or LOW State (Note 3) −0.5 to VCCB +0.5 B Outputs in HIGH or LOW State (Note 3) IIK DC Input Diode Current −50 VI < GND (OE, T/R) IOK DC Output Diode Current −50 VO < GND ±50 VO > VCC V mA mA IO DC Output Source or 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 Supply Voltage VI Input Voltage @ OE, T/R VI/O Output Voltage Min Max VCCA 2.3 3.6 VCCB 3.0 5.5 Units V 0 5.5 An HIGH or LOW State 0 VCCA Bn HIGH or LOW State 0 VCCB 3-STATE 0 5.5 −40 85 °C 0 10 ns/V TA Free Air Operating Temperature ∆t/∆V Input Edge Rate, VIN = 0.8V - 2.0V, VCCB = 2.3V - 3.6V, VCCA = 4.5V - 5.5V V 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/O’s must be held HIGH or LOW. They may not float. DC Electrical Characteristics VIHA VCCB (V) (V) Min 2.3 3.0 2.0 Level Input 3.0 3.6 2.0 Voltage 3.6 5.5 2.0 Bn 2.3 3.0 1.7 OE 3.0 3.6 2.0 T/R 3.6 5.5 2.0 An 2.7 3.0 0.8 3.0 3.6 0.8 Parameter Minimum HIGH VIHB VILA Maximum LOW An Level Input Voltage VILB TA = −40°C to +85°C VCCA Symbol Max Conditions V 3.6 5.5 0.8 Bn 2.7 3.0 0.7 OE 3.0 3.6 0.8 T/R 3.6 5.5 0.8 3 Units V www.fairchildsemi.com 74LCXZR164245 Absolute Maximum Ratings(Note 2) 74LCXZR164245 Preliminary DC Electrical Characteristics VCCB (V) (V) Min Minimum HIGH Level 2.3 3.0 VCCA−0.2 Output Voltage 2.3 3.0 2.4 IOH = −4 mA 2.3 3.0 2.0 IOH = −12 mA 2.7 3.0 2.4 2.7 4.5 3.7 2.3 3.0 VCCB−0.2 2.3 3.0 1.8 IOH = −4 mA 2.3 4.5 2.2 IOH = −12 mA 3.0 4.5 2.2 Maximum LOW Level 2.3 3.0 0.2 IOUT = 100 µA Output Voltage 2.3 3.0 0.8 IOL = 12 mA 2.3 3.0 0.6 3.6 4.5 0.7 3.0 3.0 0.2 IOUT = 100 µA 2.3 3.0 0.6 IOL = 4 mA 3.0 4.5 0.8 IOL = 12 mA Maximum Input 3.6 3.6 Leakage Current @ 3.6 5.5 ±5.0 Maximum 3-STATE 3.6 3.6 ±5.0 Output Leakage 3.6 5.5 ±5.0 Maximum 3-STATE 3.6 3.6 ±5.0 Output Leakage 3.6 5.5 ±5.0 µA Parameter VOHB VOLA VOLB IIN TA = −40°C to +85°C VCCA Symbol VOHA (Continued) Units Conditions Max IOUT = −100 µA IOH = −4 mA IOH = −12 mA V IOUT = −100 µA IOH = −12 mA IOL = 4 mA IOL = 12 mA V µA VI = VCCB or GND µA OE = VCCB OE, T/R IOZA VI = VIL, VIH, VO = VCCA, GND @ An IOZB VI = VIL, VIH, OE = VCCB VO = VCCB, GND @ Bn ∆ICC ICCB1 Maximum Bn, OE, T/R 3.6 5.5 500 µA VI = VCCB–0.6V ICC/Input An 3.6 5.5 2.0 mA VI = VCCA–2.1V 3.6 Open 50 µA An = VCCA or GND Quiescent VCCB Supply Current Bn = Open, OE = VCCA, T/R = VCCA, VCCB = Open as B Port Floats ICCA2 An = VCCA or GND, Quiescent VCCA 3.6 3.6 50 Supply Current 3.6 5.5 80 Quiescent VCCB 3.6 3.6 50 Supply Current 3.6 5.5 50 µA 0-1.5 0-1.5 ±5.0 µA Bn = VCCB or GND, µA OE = GND, T/R = GND ICCB An = VCCA or GND, Bn = VCCB or GND, OE = GND, T/R = VCCB IPU/PD Power Up 3-STATE Output Current VO = 5V to VCC VI = GND or VCC Dynamic Switching Characteristics Symbol VOLPB Parameter Quiet Output Dynamic Conditions CL = 30 pF, VIH = VCC, VIL = 0V Peak VOL, A to B VOLPA Quiet Output Dynamic CL = 30 pF, VIH = VCC, VIL = 0V Peak VOL, B to A VOLVB Quiet Output Dynamic CL = 30 pF, VIH = VCC, VIL = 0V Valley VOL, A to B VOLVA Quiet Output Dynamic CL = 30 pF, VIH = VCC, VIL = 0V Valley VOL, B to A www.fairchildsemi.com 4 VCCB VCCA TA = +25°C (V) (V) Typical 3.3 2.5 0.4 5.0 3.3 0.4 3.3 2.5 0.4 5.0 3.3 0.8 3.3 2.5 −0.4 5.0 3.3 −0.4 3.3 2.5 −0.4 5.0 3.3 −0.8 Units V V V V Preliminary TA = −40°C to +85°C Symbol Parameter tPHL Propagation Delay tPLH A to B tPHL Propagation Delay tPLH B to A tPZL Output Enable Time tPZH OE to B tPZL Output Enable Time tPZH OE to A tPHZ Output Disable Time tPLZ OE to B tPHZ Output Disable Time tPLZ OE to A tOSHL Output to Output Skew (Note 5) tOSLH Data to Output TA = −40°C to +85°C CL = 50 pF CL = 30 pF VCCB = 3.3V ± 0.3V VCCB = 2.5V ± 0.2V VCCA = 5.0V ± 0.5V VCCA = 5.0V ± 0.5V Min Max Min Max 1.0 7.5 1.0 7.0 ns 1.0 7.5 1.0 7.0 ns 1.0 10.0 1.0 11.5 ns 1.0 10.0 1.0 11.0 ns 1.0 10.5 1.0 11.0 ns 1.0 10.5 1.0 11.5 ns 1.0 ns 1.0 Units Note 5: 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). Parameter guaranteed by design. Note: Typical values at VCCA = 3.3V, VCCB = 5.0V @ 25°C. Note: Typical values at VCCA = 3.3V, VCCB = 3.3V @ 25°C. Capacitance Typ Units CIN Symbol Input Capacitance Parameter 4.5 pF VCC = Open Conditions CI/O Input/Output Capacitance 10 pF VCCA = 2.5V, 3.3V CPD Power Dissipation A→B 40 pF VCCA = 2.5V, 3.3V Capacitance (Note 6) B→A 65 pF VCCB = 5.0V VCCB = 5.0V Note 6: CPD is measured at 10 MHz. 5 www.fairchildsemi.com 74LCXZR164245 AC Electrical Characteristics 74LCXZR164245 Preliminary I/O Application for PCMCIA Cards Block Diagram The VCCA pin on the LCXZR164245 must always be tied to a 3V power supply. This voltage connection provides internal references needed to account for variations in VCCB. When connected as in the figure above, the LCXZR164245 meets all the voltage and current requirements of the ISA bus standard (IEEE P996). The LCXZR164245 is a 48-pin dual supply device well suited for PCMCIA I/O applications. Ideal for low power notebook designs, the LCXZR164245 consumes less than 1 mW of quiescent power in all modes of operation. The LCXZR164245 meets all PCMCIA I/O voltage requirements at 5V and 3.3V operation. By tying VCCA of the LCXZR164245 to the card voltage supply, the PCMCIA card will always experience rail to rail output swings, maximizing the reliability of the interface. www.fairchildsemi.com Please reference Application Note AN-5001 for more detailed information on using Fairchild’s LVX Low Voltage Dual Supply CMOS Translating Transceivers. 6 Preliminary 48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide Package Number MTD48 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 7 www.fairchildsemi.com 74LCXZR164245 16-Bit Dual Supply Translating Transceiver with 3-STATE Outputs and 26Ω Series Resistors in the Outputs (Preliminary) Physical Dimensions inches (millimeters) unless otherwise noted