October 2000 Revised September 2001 74LCXH245 Voltage Bidirection
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74LCXH245 Voltage Bidirectional Transceiver with Bushold
October 2000 Revised September 2001
74LCXH245 Voltage Bidirectional Transceiver with Bushold
LCXH245 contains eight non-inverting bidirectional buffers with 3-STATE outputs intended oriented applications. device designed voltage (2.5V 3.3V) applications. input determines direction data flow through device. input disables both ports placing them high impedance state. LCXH245 fabricated with advanced CMOS technology achieve high speed operation while maintaining CMOS power dissipation. LCXH16244 data inputs include active bushold circuitry, eliminating need external pull-up resistors hold unused floating data inputs valid logic level.
Features
tolerant control inputs 2.3V-3.6V specifications provided (VCC 3.3V), Power down high impedance outputs output drive (VCC 3.0V) Implements patented noise/EMI reduction circuitry Latch-up performance exceeds Bushold inputs eliminates need external pull-up/pull-down resistors performance: Human body model 2000V Machine model 200V
Ordering Code:
Order Number 74LCXH245WM 74LCXH245SJ 74LCXH245MSA 74LCXH245MTC 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 5.3mm Wide 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE 5.3mm Wide 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Devices also available Tape Reel. Specify appending suffix letter ordering code.
Logic Symbol
Connection Diagram
Descriptions
Names A0-A7 B0-B7 Description Output Enable Input Transmit/Receive Input Side Inputs 3-STATE Outputs (Bushold) Side Inputs 3-STATE Outputs (Bushold)
trademark Fairchild Semiconductor Corporation.
2001 Fairchild Semiconductor Corporation
DS500363
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74LCXH245
Truth Table
Inputs Outputs
HIGH Voltage Level Voltage Level Immaterial High Impedance Note Unused terminals during HIGH State must held HIGH LOW.
Data Data HIGH State (Note
Logic Diagram
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74LCXH245
Absolute Maximum Ratings(Note
Symbol IGND TSTG Parameter Supply Voltage T/R, Ports Output Voltage Input Diode Current Output Diode Current Output Source/Sink Current Supply Current Supply Ground Current Ground Storage Temperature Value Conditions Units Output 3-STATE Output HIGH State (Note
-0.5 +7.0
+7.0
-0.5 -0.5 +7.0 -0.5 ±100 ±100 +150
Recommended Operating Conditions (Note
Symbol IOH/IOL Supply Voltage Input Voltage Output Voltage Output Current HIGH State 3-STATE 3.0V 3.6V 2.7V 3.0V 2.3V 2.7V Free-Air Operating Temperature Input Edge Rate, 0.8V 2.0V, 3.0V Parameter Operating Data Retention Units
ns/V
Note Absolute Maximum Ratings those values beyond which safety device cannot guaranteed. device should operated these limits. parametric values defined Electrical Characteristics tables guaranteed Absolute Maximum Ratings. "Recommended Operating Conditions" table will define conditions actual device operation. Note Absolute Maximum Rating must observed. Note Floating unused control inputs must HIGH LOW.
Electrical Characteristics
Symbol Parameter HIGH Level Input Voltage Level Input Voltage HIGH Level Output Voltage -100 Level Output Voltage Input Leakage Current Conditions 0.55 ±5.0 -40°C +85°C Units
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74LCXH245
Electrical Characteristics
Symbol II(HOLD) Parameter Bushold Input Minimum Drive Hold Current
(Continued)
-40°C +85°C -300 -450 ±5.0
Conditions 0.7V 1.7V 0.8V 2.0V
Units
II(OD)
Bushold Input Over-Drive Current Change State
(Note (Note (Note (Note
3-STATE Leakage Quiescent Supply Current Increase Input
3.6V 5.5V (Note -0.6V
Note Outputs disabled 3-STATE only. Note external driver must source least specified current switch from LOW-to-HIGH. Note external driver must sink least specified current switch from HIGH-to-LOW.
Electrical Characteristics
-40°C +85°C, Symbol Parameter 3.3V 0.3V tPHL tPLH tPZL tPZH tPLZ tPHZ tOSHL tOSLH Output Output Skew (Note Output Disable Time Propagation Delay Output Enable Time 2.7V 10.5 10.5 2.5V 0.2V Units
Note Skew defined absolute value difference between actual propagation delay separate outputs same device. specification applies outputs switching same direction, either HIGH-to-LOW (tOSHL) LOW-to-HIGH (tOSLH).
Dynamic Switching Characteristics
Symbol VOLP VOLV Parameter Quiet Output Dynamic Peak Quiet Output Dynamic Valley Conditions 3.3V, 2.5V, 3.3V, 2.5V, 25°C Typical -0.8 -0.6 Units
Capacitance
Symbol CI/O Parameter Input Capacitance Input/Output Capacitance Power Dissipation Capacitance Conditions Open, 3.3V, 3.3V, VCC, Typical Units
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74LCXH245
LOADING WAVEFORMS Generic Family
FIGURE Test Circuit includes probe capacitance) Test tPLH, tPHL tPZL, tPLZ tPZH, tPHZ Switch Open 0.3V; 2.7V 0.2V
Waveform Inverting Non-Inverting Functions
3-STATE Output High Enable Disable Times Logic
Propagation Delay. Pulse Width trec Waveforms
Setup Time, Hold Time Recovery Time Logic
3-STATE Output Enable Disable Times Logic FIGURE Waveforms (Input Characteristics; =1MHz, 3ns) Symbol 3.3V 0.3V 1.5V 1.5V 0.3V 0.3V 1.5V 1.5V 0.3V 0.3V 2.7V
trise tfall
2.5V 0.2V VCC/2 VCC/2 0.15V 0.15V
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74LCXH245
Schematic Diagram Generic LCXH Family (with Bushold)
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74LCXH245
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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74LCXH245
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Small Outline Package (SOP), EIAJ TYPE 5.3mm Wide Package Number M20D
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74LCXH245
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE 5.3mm Wide Package Number MSA20
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74LCXH245 Voltage Bidirectional Transceiver with Bushold
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 assume responsibility circuitry described, circuit patent licenses implied Fairchild reserves right time without notice change said circuitry specifications. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT FAIRCHILD SEMICONDUCTOR CORPORATION. used herein: Life support devices systems devices systems which, intended surgical implant into body, support sustain life, whose failure perform when properly used accordance with instructions provided labeling, reasonably expected result significant injury user. www.fairchildsemi.com critical component component life support device system whose failure perform reasonably expected cause failure life support device system, affect safety effectiveness. www.fairchildsemi.com
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