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74VCX164245 Low Voltage 16-Bit Dual Supply Translating Transceiver with 3-STATE Outputs
March 2000 Revised March 2000
74VCX164245 Low Voltage 16-Bit Dual Supply Translating Transceiver with 3-STATE Outputs
General Description
The VCX164245 is a dual supply, 16-bit translating transceiver that is designed for 2 way asynchronous communication between busses at different supply voltages by providing true signal translation. The supply rails consist of VCCB, which is the higher potential rail operating at 2.3 to 3.6V and VCCA, which is the lower potential rail operating at 1.65 to 2.7V. (VCCA must be less than or equal to VCCB for proper device operation.) This dual supply design allows for translation from 1.8V to 2.5V busses to busses at a higher potential, up to 3.3V. 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 (OE) input, when HIGH, disables both A and P Ports by placing them in a High-Z condition. The A Port interfaces with the lower voltage bus (1.8 - 2.5V); The B Port interfaces with the higher voltage bus (2.7 - 3.3V). Also the VCX164245 is designed so that the control pins (T/Rn, OEn) are supplied by VCCB. The 74VCX164245 is suitable for mixed voltage applications such as notebook computers using a 1.8V CPU and 3.3V peripheral components. It is fabricated with an Advanced CMOS technology to achieve high speed operation while maintaining low CMOS power dissipation.
Features
s Bidirectional interface between busses ranging from 1.65V to 3.6V s Supports Live Insertion and Withdrawal (Note 1) s Static Drive (IOH/IOL) 24 mA @ 3.0V VCC 18 mA @ 2.3V VCC 6 mA @ 1.65V VCC s Uses patented noise/EMI reduction circuitry s Functionally compatible with 74 series 16245 s Latchup performance exceeds 300 mA s ESD performance: Human Body Model >2000V Machine model >200V
Note 1: To ensure the high impedance state during power up or power down, OEn should be tied to VCCB 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 74VCX164245MTD Package Number MTD48 Package Description 48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Device also available in Tape and Reel. Specify by appending suffix letter "X" to the ordering code.
Logic Diagram
Pin Descriptions
Pin Names OEn T/Rn A0-A15 B0-B15 Description Output Enable Input (Active LOW) Transmit/Receive Input Side A Inputs or 3-STATE Outputs Side B Inputs or 3-STATE Outputs
Quiet SeriesTM is a trademark of Fairchild Semiconductor Corporation.
(c) 2000 Fairchild Semiconductor Corporation
DS500159
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74VCX164245
Connection Diagram
Truth Tables
Inputs OE1 L L H Inputs OE2 L L H T/R2 L H X Outputs Bus B8-B15 Data to Bus A8-A15 Bus A8-A15 Data to Bus B8-B15 HIGH-Z State on A8-A15, B8-B15 T/R1 L H X Outputs Bus B0-B7 Data to Bus A0-A7 Bus A0-A7 Data to Bus B0-B7 HIGH Z State on A0-A7, B0-B7
H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial (HIGH or LOW, inputs may not float) Z = High Impedance
Translator Power Up Sequence Recommendations
To guard against power up problems, some simple guidelines need to be adhered to. The VCX164245 is designed so that the control pins (T/Rn, OEn) are supplied by VCCB. Therefore the first recommendation is to begin by powering up the control side of the device, VCCB. The OEn control pins should be ramped with or ahead of VCCB, this will guard against bus contentions and oscillations as all A-Port and B Port outputs will be disabled. To ensure the high impedance state during power up or power down, OEn should be tied to VCCB through a pull up resistor. The minimum value of the resistor is determined by the current sourcing capability of the driver. Second, the T/Rn control pins should be placed at logic low (0V) level, this will ensure that the B-side bus pins are configured as inputs to help guard against bus contention and oscillations. B-side Data Inputs should be driven to a valid logic level (0V or VCCB), this will prevent excessive current draw and oscillations. VCCA can then be powered up after VCCB, but should never exceed the VCCB voltage level. Upon completion of these steps the device can then be configured for the users desired operation. Following these steps will help to prevent possible damage to the translator device as well as other system components.
Logic Diagrams
Please note that these diagrams are provided only for the understanding of logic operations and should not be used to estimate propagation delays.
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74VCX164245
Absolute Maximum Ratings(Note 2)
Supply Voltage VCCA VCCB DC Input Voltage (VI) DC Output Voltage (VI/O) Outputs 3-STATE Outputs Active (Note 3) An Bn DC Input Diode Current (IIK) VI < 0V DC Output Diode Current (IOK) VO < 0V VO > VCC DC Output Source/Sink Current (IOH/IOL) DC VCC or Ground Current Supply Pin (ICC or Ground) Storage Temperature (TSTG) -65C to +150C 100 mA -50 mA +50 mA 50 mA -50 mA -0.5V to VCCA + 0.5V -0.5V to VCCB + 0.5V -0.5V to +4.6V -0.5V to VCCB -0.5V to 4.6V -0.5V to +4.6V
Recommended Operating Conditions (Note 4)
Power Supply (Note 5) VCCA VCCB Input Voltage (VI) @ OE, T/R Input/Output Voltage (VI/O) An Bn Output Current in IOH/IOL VCCA = 2.3V to 2.7V VCCA = 1.65V to 1.95V VCCB = 3.0V to 3.6V VCCB = 2.3V to 2.7V Free Air Operating Temperature (TA) Minimum Input Edge Rate (t/V) VIN = 0.8V to 2.0V, VCC = 3.0V 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/O pins must be held HIGH or LOW. They may not float. Note 5: Operation requires: VCCA VCCB
1.65V to 2.7V 2.3V to 3.6V 0V to VCCB 0V to VCCA 0V to VCCB 18 mA 6 mA 24 mA 18 mA -40C to +85C
DC Electrical Characteristics (1.65V < VCCA 1.95V, 2.3V < VCCB 2.7V)
Symbol VIHA VIHB VILA VILB VOHA VOHB VOLA VOLB II IOZ Parameter HIGH Level Input Voltage An Bn, T/R, OE LOW Level Input Voltage An Bn, T/R, OE HIGH Level Output Voltage HIGH Level Output Voltage LOW Level Output Voltage LOW Level Output Voltage IOH = -100 A IOH = -6 mA IOH = -100 A IOH = -18 mA IOL = 100 A IOL = 6 mA IOL = 100 A IOL = 18 mA Input Leakage Current @ OE, T/R 3-STATE Output Leakage 0V VI 3.6V 0V VO 3.6V OE = VCCB VI = VIH or VIL IOFF ICCA/ICCB Power OFF Leakage Current Quiescent Supply Current, per supply, VCCA / VCCB 0 (VI, VO) 3.6V An = VCCA or GND Bn, OE, & T/R = V CCB or GND VCCA An 3.6V VCCB Bn, OE, T/R 3.6V ICC Increase in ICC per Input, Bn, T/R, OE Increase in ICC per Input, An VI = VCCB - 0.6V VI = VCCA - 0.6V 0 1.65-1.95 0 2.3-2.7 10 20 20 750 750 A A A A A 1.65-1.95 2.3-2.7 10 A Conditions VCCA (V) 1.65-1.95 1.65-1.95 1.6-1.95 1.65-1.95 1.65-1.95 1.65 1.65-1.95 1.65-1.95 1.65-1.95 1.65 1.65-1.95 1.65-1.95 1.65-1.95 VCCB (V) 2.3-2.7 2.3-2.7 2.3-2.7 2.3-2.7 2.3-2.7 2.3-2.7 2.3-2.7 2.3 2.3-2.7 2.3-2.7 2.3-2.7 2.3 2.3-2.7 VCCA-0.2 1.25 VCCB-0.2 1.7 0.2 0.3 0.2 0.6 5.0 Min 0.65 x VCC 1.6 0.35 x VCC 0.7 Max Units V V V V V V V V A
1.65-1.95 1.65-1.95 1.65-1.95
2.3-2.7 2.3-2.7 2.3-2.7
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74VCX164245
DC Electrical Characteristics (1.65V < VCCA 1.95V, 3.0V < VCCB 3.6V)
Symbol VIHA VIHB VILA VILB VOHA VOHB VOLA VOLB II IOZ HIGH Level Input Voltage LOW Level Input Voltage Parameter An Bn, T/R, OE An Bn, T/R, OE IOH = -100 A IOH = -6 mA HIGH Level Output Voltage LOW Level Output Voltage LOW Level Output Voltage IOH = -100 A IOH = -24 mA IOL = 100 A IOL = 6 mA IOL = 100 A IOL = 24 mA Input Leakage Current @ OE, T/R 3-STATE Output Leakage 0V VI 3.6V 0V VO 3.6V OE* = VCCB VI = V IH or VIL IOFF ICCA/ICCB Power Off Leakage Current Quiescent Supply Current, per supply, VCCA/VCCB 0 (VI, VO) 3.6V An = VCCA or GND Bn, OE, & T/R = VCCB or GND VCCA An 3.6V VCCB Bn, OE, T/R 3.6V ICC Increase in ICC per Input, Bn, T/R, OE Increase in ICC per Input, An VI = V CCB - 0.6V VI = V CCA - 0.6V 0 1.65-1.95 0 3.0-3.6 10 20 20 750 750 A A A A A 1.65-1.95 3.0-3.6 10 A Conditions VCCA (V) 1.65-1.95 1.65-1.95 1.65-1.95 1.65-1.95 1.65-1.95 1.65 1.65-1.95 1.65-1.95 1.65-1.95 1.65 1.65-1.95 1.65-1.95 1.65-1.95 VCCB (V) 3.0-3.6 3.0-3.6 3.0-3.6 3.0-3.6 3.0-3.6 3.0-3.6 3.0-3.6 3.0 3.0-3.6 3.0-3.6 3.0-3.6 3.0 3.0-3.6 VCCA-0.2 1.25 VCCA-0.2 2.2 0.2 0.3 0.2 0.55 5.0 Min 0.65 x VCC 2.0 0.35 x VCC 0.8 Max Units V V V V V V V V A
HIGH Level Output Voltage
1.65-1.95 1.65-1.95 1.65-1.95
3.0-3.6 3.0-3.6 3.0-3.6
DC Electrical Characteristics (2.3V < VCCA 2.7V, 3.0V VCCB 3.6V)
Symbol VIHA VIHB VILA VILB VOHA VOHB VOLA VOLB II IOZ Parameter HIGH Level Input Voltage An Bn, T/R, OE LOW Level Input Voltage An Bn, T/R, OE HIGH Level Output Voltage HIGH Level Output Voltage LOW Level Output Voltage LOW Level Output Voltage IOH = -100 A IOH = -18 mA IOH = -100 A IOH = -24 mA IOL = 100 A IOL = 18 mA IOL = 100 A IOL = 24 mA Input Leakage Current @ OE, T/R 3-STATE Output Leakage @ An 0V VI 3.6V 0V VO 3.6V OE = VCCA VI = V IH or VIL IOFF ICCA/ICCB Power OFF Leakage Current Quiescent Supply Current, per supply, VCCA/VCCB 0 (VI, VO) 3.6V An = VCCA or GND Bn, OE, & T/R = VCCB or GND VCCA An 3.6V VCCB Bn, OE, T/R 3.6V ICC Increase in ICC per Input, Bn, T/R, OE Increase in ICC per Input, An VI = V CCB - 0.6V VI = V CCA - 0.6V 0 2.3-2.7 0 3.0-3.6 10 20 20 750 750 A A A A A 2.3-2.7 3.0-3.6 10 A Conditions VCCA (V) 2.3-2.7 2.3-2.7 2.3-2.7 2.3-2.7 2.3-2.7 2.3 2.3-2.7 2.3-2.7 2.3-2.7 2.3 2.3-2.7 2.3-2.7 2.3-2.7 VCCB (V) 3.0-3.6 3.0-3.6 3.0-3.6 3.0-3.6 3.0-3.6 3.0-3.6 3.0-3.6 3.0 3.0-3.6 3.0-3.6 3.0-3.6 3.0 3.0-3.6 VCCA-0.2 1.7 VCCB-0.2 2.2 0.2 0.6 0.2 0.55 5.0 Min 1.6 2.0 0.7 0.8 Max Units V V V V V V V V A
2.3-2.7 2.3-2.7 2.3-2.7
3.0-3.6 3.0-3.6 3.0-3.6
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74VCX164245
AC Electrical Characteristics
CL = 30 pF, RL = 500, TA = -40C to +85C, Symbol Parameter VCCA = 1.65V to 1.95V VCCB = 2.3V to 2.7V Min tPHL, tPLH tPHL, tPLH tPZL, tPZH tPZL, tPZH tPLZ, tPHZ tPLZ, tPHZ tosHL tosLH Prop Delay, A to B Prop Delay, B to A Output Enable Time, OE to B Output Enable Time, OE to A Output Disable Time, OE to B Output Disable Time, OE to A Output to Output Skew (Note 6) 0.8 1.5 0.8 1.5 0.8 0.8 Max 5.5 5.8 5.3 8.3 5.2 4.6 0.5 VCCA = 1.65V to 1.95V VCCB = 3.0V to 3.6V Min 0.6 1.5 0.6 1.5 0.8 0.8 Max 5.1 6.2 5.1 8.2 5.6 4.5 0.5 VCCA = 2.3V to 2.7V VCCB = 3.0V to 3.6V Min 0.6 0.8 0.6 0.8 0.8 0.8 Max 4.0 4.4 4.0 4.6 4.8 4.4 0.75 ns ns ns ns ns ns ns Units
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 Parameter Quiet Output Dynamic Peak VOL, B to A Quiet Output Dynamic Peak VOL, A to B VOLV Quiet Output Dynamic Valley VOL, B to A Quiet Output Dynamic Valley VOL, A to B VOHV Quiet Output Dynamic Valley VOH, A to B Quiet Output Dynamic Valley VOH, B to A CL = 30 pF, VIH = VCC, VIL = 0V CL = 30 pF, VIH = VCC, VIL = 0V CL = 30 pF, VIH = VCC, VIL = 0V CL = 30 pF, VIH = VCC, VIL = 0V CL = 30 pF, VIH = VCC, VIL = 0V Conditions CL = 30 pF, VIH = VCC, VIL = 0V VCCA (V) 1.8 1.8 2.5 1.8 1.8 2.5 1.8 1.8 2.5 1.8 1.8 2.5 1.8 1.8 2.5 1.8 1.8 2.5 VCCB (V) 2.5 3.3 3.3 2.5 3.3 3.3 2.5 3.3 3.3 2.5 3.3 3.3 2.5 3.3 3.3 2.5 3.3 3.3 TA = 25C Typical 0.25 0.25 0.6 0.6 0.8 0.8 -0.25 -0.25 -0.6 -0.6 -0.8 -0.8 1.7 2.0 2.0 1.3 1.3 1.7 V V V V V V Units
Capacitance
Symbol CIN CI/O CPD Input Capacitance Input/Output Capacitance Power Dissipation Capacitance Parameter Conditions VCCA = 2.5V, VCCB = 3.3V, VI = 0V or VCCA/B VCCA = 2.5V, VCCB = 3.3V, VI = 0V or VCCA/B VCCA = 2.5V, VCCB = 3.3V, VI = 0V or VCCA/B f = 10 MHz TA = +25C Typical 5 6 20 Units pF pF pF
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74VCX164245
AC Loading and Waveforms
FIGURE 1. AC Test Circuit 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; 1.8V 0.15V GND
FIGURE 2. Waveform for Inverting and Non-inverting Functions tR = tF 2.0 ns, 10% to 90%
FIGURE 3. 3-STATE Output High Enable and Disable Times for Low Voltage Logic tR = tF 2.0 ns, 10% to 90%
FIGURE 4. 3-STATE Output Low Enable and Disable Times for Low Voltage Logic tR = tF 2.0 ns, 10% to 90% VCC 3.3V 0.3V 1.5V 1.5V VOL + 0.3V VOH - 0.3V 2.5V 0.2V VCC/2 VCC/2 VOL + 0.15V VOH - 0.15V 1.8V 0.15V VCC/2 VCC/2 VOL + 0.15V VOH - 0.15V
Symbol Vmi Vmo VX VY
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74VCX164245
Physical Dimensions inches (millimeters) unless otherwise noted
48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide Package Number MTD48
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74VCX164245 Low Voltage 16-Bit Dual Supply Translating Transceiver with 3-STATE Outputs
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: 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. 8 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
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