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74LCXH2245 Low Voltage Bidirectional Transceiver with Bushold and 26 Series Resistors in B Outputs
October 2000 Revised September 2001
74LCXH2245 Low Voltage Bidirectional Transceiver with Bushold and 26 Series Resistors in B Outputs
General Description
The LCXH2245 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. 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 in the B Port output helps reduce output overshoot and undershoot. The LCXH2245 is fabricated with an advanced CMOS technology to achieve high speed operation while maintaining CMOS low power dissipation. The LCXH2245 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.
Features
s 5V tolerant control inputs s 2.3V-3.6V VCC specifications provided s Bushold on inputs eliminates the need for external pull-up/pull-down resistors s 7.0 ns tPD max (VCC = 3.3V), 10 A ICC max s Power down high impedance outputs s 12 mA output drive B Port (VCC = 3.0V) s Implements patented noise/EMI reduction circuitry s Latch-up performance exceeds 500 mA s Equivalent 26 series resistor on B Port outputs s ESD performance: Human body model > 2000V Machine model > 200V
Ordering Code:
Order Number 74LCXH2245WM 74LCXH2245SJ 74LCXH2245MSA 74LCXH2245MTC 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 (Bushold) Side B Inputs or 3-STATE Outputs (Bushold)
GTO is a trademark of Fairchild Semiconductor Corporation.
(c) 2001 Fairchild Semiconductor Corporation
DS500409
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74LCXH2245
Truth Table
Inputs Outputs OE L L H
H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Z = High Impedance
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
Logic Diagram
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74LCXH2245
Absolute Maximum Ratings(Note 1)
Symbol VCC VI VO IIK IOK IO ICC IGND TSTG Parameter Supply Voltage T/R, OE, I/O Ports 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 HIGH or LOW State (Note 2) 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 VCC +0.5 -0.5 to VCC + 0.5 -50 -50 +50 50 100 100 -65 to +150
C
Recommended Operating Conditions (Note 3)
Symbol VCC VI VO IOH/IOL Supply Voltage Input Voltage Output Voltage Output Current in IOH/IOL - A Outputs HIGH or LOW State 3-STATE VCC = 3.0V - 3.6V VCC = 2.7V - 3.0V VCC = 2.3V - 2.7V Output Current in IOH/IOL - B Outputs 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 VCC VCC 5.5 Units V V V
24 12 8 12 8 4 -40
0 85 10 mA mA
C
ns/V
t/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 HIGH or LOW.
DC Electrical Characteristics
Symbol VIH VIL VOH Parameter HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Voltage A Outputs IOH = -100 A IOH = -8 mA IOH = -12 mA IOH = -16 mA IOH = -24 mA VOH HIGH Level Output Voltage B Outputs IOH = -100 A IOH = -4 mA IOH = -4 mA IOH = -6 mA IOH = -8 mA IOH = -12 mA 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 3.0 2.3 - 3.6 2.3 2.7 3.0 2.7 3.0 VCC - 0.2 1.8 2.2 2.4 2.2 VCC - 0.2 1.8 2.2 2.4 2.0 2.0 V V TA = -40C to +85C Min 1.7 2.0 0.7 0.8 Max V V Units
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74LCXH2245
DC Electrical Characteristics
Symbol VOL Parameter LOW Level Output Voltage A Outputs
(Continued)
VCC (V) 2.3 - 3.6 2.3 2.7 3.0 3.0 2.3 - 3.6 2.3 2.7 3.0 2.7 3.0 2.3 - 3.6 2.3 3.0 2.7 3.6 2.3 - 3.6 2.3 - 3.6 2.3 - 3.6 2.3 - 3.6 45 -45 75 -75 300 -300 450 -450 5.0 10 10 500 A A A A A TA = -40C to +85C Min Max 0.2 0.6 0.4 0.4 0.55 0.2 0.6 0.4 0.55 0.6 0.8 5.0 A V V
Conditions IOL = 100 A IOL = 8 mA IOL = 12 mA IOL = 16 mA IOL = 24 mA
Units
VOL
LOW Level Output Voltage B Outputs
IOL = 100 A IOL = 4 mA IOL = 4 mA IOL = 6 mA IOL = 8 mA IOL = 12 mA
II II(HOLD)
Input Leakage Current Bushold Input Minimum Drive Hold Current
VI = VCC or GND VIN = 0.7V VIN = 1.7V VIN = 0.8V VIN = 2.0V
II(OD)
Bushold Input Over-Drive Current to Change State
(Note 5) (Note 6) (Note 5) (Note 6)
IOZ ICC ICC
3-STATE I/O Leakage Quiescent Supply Current Increase in ICC per Input
VO = VCC or GND VI = VIH or VIL VI = VCC or GND 3.6V VI, VO 5.5V (Note 4) VIH = V CC -0.6V
Note 4: Outputs disabled or 3-STATE only. Note 5: An external driver must source at least the specified current to switch from LOW-to-HIGH. Note 6: An external driver must sink at least the specified current to switch from HIGH-to-LOW.
AC Electrical Characteristics
TA = -40C to +85C, RL = 500 Symbol Parameter VCC = 3.3V 0.3V CL = 50 pF Min tPHL tPLH tPHL tPLH tPZL tPZH tPZL tPZH tPLZ tPHZ tPLZ tPHZ tOSHL tOSLH Propagation Delay A to B Propagation Delay B to A Output Enable Time A to B Output Enable Time B to A Output Disable Time A to B Output Disable Time B to A Output to Output Skew (Note 7) 1.5 1.5 1.5 1.5 1.5 1.5 Max 8.0 7.0 9.5 8.5 7.5 7.5 1.0 VCC = 2.7V CL = 50 pF Min 1.5 1.5 1.5 1.5 1.5 1.5 Max 9.0 8.0 10.5 9.5 8.5 8.5 VCC = 2.5V 0.2V CL = 30 pF Min 1.5 1.5 1.5 1.5 1.5 1.5 Max 9.6 8.4 11.0 10.5 9.0 9.0 ns ns ns 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).
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74LCXH2245
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 Conditions CL = 30 pF, VIH = 2.5V, VIL = 0V CL = 50 pF, VIH =3.3V, VIL = 0V CL = 30 pF, VIH = 2.5V, VIL = 0V CL = 50 pF, VIH = 3.3V, VIL = 0V CL = 30 pF, VIH = 2.5V, V IL = 0V CL = 50 pF, VIH = 3.3V, VIL = 0V CL = 30 pF, VIH = 2.5V, V IL = 0V CL = 50 pF, VIH = 3.3V, VIL = 0V VCC (V) 2.5 3.3 2.5 3.3 2.5 3.3 2.5 3.3 TA = 25C Typical 0.6 0.8 0.4 0.5 -0.6 -0.8 -0.4 -0.5 Units V V V V
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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74LCXH2245
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; and 2.7V 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 2.7V 1.5V 1.5V VOL + 0.3V VOH - 0.3V
trise and tfall
2.5V 0.2V VCC/2 VCC/2 VOL + 0.15V VOH - 0.15V
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74LCXH2245
Schematic Diagram Generic for LCXH Family (with Bushold)
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74LCXH2245
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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74LCXH2245
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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74LCXH2245
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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74LCXH2245 Low Voltage Bidirectional Transceiver with Bushold and 26 Series Resistors in B Outputs
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. 11 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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