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74LCXR2245 Low Voltage Bidirectional Transceiver with 5V Tolerant Inputs and Outputs and 26 Series Resistors on Both A and B Ports
October 2000 Revised October 2000
74LCXR2245 Low Voltage Bidirectional Transceiver with 5V Tolerant Inputs and Outputs and 26 Series Resistors on Both A and B Ports
General Description
The LCXR2245 contains eight non-inverting bidirectional buffers with 3-STATE outputs and is intended for bus oriented applications. The device is designed for low voltage (2.5V and 3.3V) VCC applications with capability of interfacing to a 5V signal environment. The T/R input determines the direction of data flow through the device. The OE input disables both the A and B ports by placing them in a high impedance state. The 26 series resistor helps reduce output overshoot and undershoot. The LCXR2245 is fabricated with an advanced CMOS technology to achieve high speed operation while maintaining CMOS low power dissipation.
Features
s 5V tolerant inputs and outputs s 2.3V-3.6V VCC specifications provided s 8.0 ns tPD max (VCC = 3.3V), 10 A ICC max s Power down high impedance inputs and outputs s Supports live insertion/withdrawal (Note 1) s 12 mA output drive (VCC = 3.0V) s Implements patented noise/EMI reduction circuitry s Latch-up performance exceeds 500 mA s Equivalent 26 series resistor on all outputs s 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 74LCXR2245WM 74LCXR2245SJ 74LCXR2245MSA 74LCXR2245MTC Package Number M20B M20D MSA20 MTC20 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 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm 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
Connection Diagram
Pin Descriptions
Pin Names OE T/R A0-A7 B0-B7 Description Output Enable Input Transmit/Receive Input Side A Inputs or 3-STATE Outputs Side B Inputs or 3-STATE Outputs
(c) 2000 Fairchild Semiconductor Corporation
DS500361
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74LCXR2245
Truth Table
Inputs Outputs OE L L H
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.
T/R L H X Bus B0 - B7 Data to Bus A0 - A7 Bus A0 - A7 Data to Bus B0 - B7 HIGH Z State on A0 - A7, B0 - B7 (Note 2)
Logic Diagram
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74LCXR2245
Absolute Maximum Ratings(Note 3)
Symbol VCC VI VO IIK IOK IO ICC IGND TSTG Parameter Supply Voltage DC Input Voltage DC Output Voltage DC Input Diode Current DC Output Diode Current DC Output Source/Sink Current DC Supply Current per Supply Pin DC Ground Current per Ground Pin Storage Temperature Value Conditions Units V V Output in 3-STATE Output in HIGH or LOW State (Note 4) VI < GND VO < GND VO > VCC V mA mA mA mA mA
-0.5 to +7.0 -0.5 to +7.0 -0.5 to +7.0 -0.5 to VCC + 0.5 -50 -50 +50 50 100 100 -65 to +150
C
Recommended Operating Conditions (Note 5)
Symbol VCC VI VO IOH/IOL Supply Voltage Input Voltage Output Voltage Output Current HIGH or LOW State 3-STATE VCC = 3.0V - 3.6V VCC = 2.7V - 3.0V VCC = 2.3V - 2.7V TA Free-Air Operating Temperature Input Edge Rate, VIN = 0.8V - 2.0V, VCC = 3.0V Parameter Operating Data Retention Min 2.0 1.5 0 0 0 Max 3.6 3.6 5.5 VCC 5.5 Units V V V
12 8 4 -40
0 85 10 mA
C
ns/V
t/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: Unused inputs or I/O pins must be held HIGH or LOW. They may not float.
DC Electrical Characteristics
Symbol VIH VIL VOH Parameter HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Voltage IOH = -100 A IOH = -4 mA IOH = -4 mA IOH = -6 mA IOH = -8 mA IOH = -12 mA VOL LOW Level Output Voltage IOL = 100 A IOL = 4 mA IOL = 4 mA IOL = 6 mA IOL = 8 mA IOL = 12 mA II IOZ Input Leakage Current 3-STATE I/O Leakage 0 VI 5.5V 0 VO 5.5V VI = VIH or VIL Conditions VCC (V) 2.3 - 2.7 2.7 - 3.6 2.3 - 2.7 2.7 - 3.6 2.3 - 3.6 2.3 2.7 3.0 2.7 3.0 2.3 - 3.6 2.3 2.7 3.0 2.7 3.0 2.3 - 3.6 2.3 - 3.6 VCC - 0.2 1.8 2.2 2.4 2.0 2.0 0.2 0.6 0.4 0.55 0.6 0.8 5.0 5.0 A A V V TA = -40C to +85C Min 1.7 2.0 0.7 0.8 Max Units V V
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74LCXR2245
DC Electrical Characteristics
Symbol IOFF ICC ICC Parameter Power-Off Leakage Current Quiescent Supply Current Increase in ICC per Input
(Continued)
VCC (V) 0 2.3 - 3.6 2.3 - 3.6 2.3 - 3.6 TA = -40C to +85C Min Max 10 10 10 500 A A A
Conditions VI or VO = 5.5V VI = VCC or GND 3.6V VI, VO 5.5V (Note 6) VIH = V CC -0.6V
Units
Note 6: Outputs disabled or 3-STATE only.
AC Electrical Characteristics
TA = -40C to +85C, RL = 500 Symbol Parameter VCC = 3.3V 0.3V CL = 50 pF Min tPHL tPLH tPZL tPZH tPLZ tPHZ tOSHL tOSLH Output to Output Skew (Note 7) Output Disable Time Propagation Delay An to Bn or Bn to An Output Enable Time 1.5 1.5 1.5 1.5 1.5 1.5 Max 8.0 8.0 9.5 9.5 7.5 7.5 1.0 1.0 Min 1.5 1.5 1.5 1.5 1.5 1.5 VCC = 2.7V CL = 50 pF Max 9.0 9.0 10.5 10.5 8.5 8.5 Min 1.5 1.5 1.5 1.5 1.5 1.5 VCC = 2.5V 0.2V CL = 30 pF Max 9.6 9.6 11.0 11.0 9.0 9.0 ns ns ns ns Units
Note 7: 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 Parameter Quiet Output Dynamic Peak VOL Quiet Output Dynamic Valley VOL Conditions CL = 50 pF, VIH = 3.3V, VIL = 0V CL = 30 pF, VIH = 2.5V, VIL = 0V CL = 50 pF, VIH = 3.3V, V IL = 0V CL = 30 pF, VIH = 2.5V, VIL = 0V VCC (V) 3.3 2.5 3.3 2.5 TA = 25C Typical 0.5 0.4 0.5 0.4 V V Units
Capacitance
Symbol CIN CI/O CPD Parameter Input Capacitance Input/Output Capacitance Power Dissipation Capacitance Conditions VCC = Open, VI = 0V or VCC VCC = 3.3V, VI = 0V or VCC VCC = 3.3V, VI = 0V or VCC, f = 10 MHz Typical 7 8 25 Units pF pF pF
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74LCXR2245
AC LOADING and WAVEFORMS Generic for LCX Family
FIGURE 1. AC Test Circuit (CL includes probe and jig capacitance) 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 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
3-STATE Output Low Enable and Disable Times for Logic FIGURE 2. Waveforms (Input Characteristics; f =1MHz, tR = tF = 3ns) Symbol Vmi Vmo Vx Vy VCC 3.3V 0.3V 1.5V 1.5V VOL + 0.3V VOH - 0.3V 1.5V 1.5V VOL + 0.3V VOH - 0.3V 2.7V
trise and tfall
2.5V 0.2V VCC/2 VCC/2 VOL + 0.15V VOH - 0.15V
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74LCXR2245
Schematic Diagram Generic for LCX Family
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74LCXR2245
Physical Dimensions inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide Package Number M20B
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74LCXR2245
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M20D
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74LCXR2245
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide Package Number MSA20
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74LCXR2245 Low Voltage Bidirectional Transceiver with 5V Tolerant Inputs and Outputs and 26 Series Resistors on Both A and B Ports
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: 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 10 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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