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Part: 74LCX245MSAX
Category:
Logic
-> Transceivers
Description: Low Voltage Bidirectional Transceiver With 5V Tolerant Inputs And Outputs<<<>>>the LCX245 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 LCX245 is Fabricated With an Advanced CMOS Technology to Achieve High Speed Operation While Maintaining CMOS Low Power Dissipation.
Company: Fairchild Semiconductor
Datasheet: Download 74LCX245MSAX datasheet File size : 201 kB
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Datasheet text preview:
74LCX245 Low Voltage Bidirectional Transceiver with 5V Tolerant Inputs and Outputs
February 1994 Revised February 2004
74LCX245 Low Voltage Bidirectional Transceiver with 5V Tolerant Inputs and Outputs
General Description
The LCX245 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 LCX245 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 to 3.6V VCC specifications provided s 7.0 ns tPD max (VCC = 3.3V), 10 µA ICC max s Power down high impedance inputs and outputs s Supports live insertion/withdrawal (Note 1) s ±24 mA output drive (VCC = 3.0V) s Implements patented noise/EMI reduction circuitry s Latch-up performance exceeds 500 mA s ESD performance: Human body model > 2000V Machine model > 200V s Leadless DQFN package
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 74LCX245WM (Note 2) 74LCX245SJ (Note 2) 74LCX245BQX (Note 3) 74LCX245MSA (Note 2) 74LCX245MTC (Note 2) Package Number M20B M20D MLP020B 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-Terminal Depopulated Quad Very-Thin Flat Pack No Leads (DQFN), JEDEC MO-241, 2.5 x 4.5mm 20-Lead Shrink Small Outline Package (SSOP), JEDEC MO-150, 5.3mm Wide 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Note 2: Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code. Note 3: DQFN package available in Tape and Reel only.
© 2004 Fairchild Semiconductor Corporation
DS012006
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74LCX245
Logic Symbol
Connection Diagrams
Pin Assignments for SOIC, SOP, SSOP, and TSSOP
Pin Descriptions
Pin Names OE T/R A0A7 B0B7 Description Output Enable Input Transmit/Receive Input Side A Inputs or 3-STATE Outputs Side B Inputs or 3-STATE Outputs Pin Assignment for DQFN
Truth Table
Inputs Outputs OE L L H 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 4)
H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Z = High Impedance Note 4: Unused bus terminals during HIGH Z State must be held HIGH or LOW.
(Top Through View)
Logic Diagram
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74LCX245
Absolute Maximum Ratings(Note 5)
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 6) VI 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 -5 0 -5 0 +5 0 ±5 0 ±100 ±100 -65 to +150
°C
Recommended Operating Conditions (Note 7)
Symbol VCC VI VO IOH/IOL Supply Voltage Input Voltage Output Voltage Output Current HIGH or LOW State 3-STATE VCC = 3.0V to 3.6V VCC = 2.7V to 3.0V VCC = 2.3V to 2.7V TA Free-Air Operating Temperature Input Edge Rate, VIN = 0.8V to 2.0V, VCC = 3.0V Parameter Operating Data Retention Min 2.0 1 .5 0 0 0 Max 3.6 3.6 5.5 VC C 5.5 Units V V V
±2 4 ±1 2 ±8 -4 0
0 85 10 mA
°C
ns/V
t/V
Note 5: 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 6: IO Absolute Maximum Rating must be observed. Note 7: 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 µA IOH = -8 mA IOH = -12 mA IOH = -18 mA IOH = -24 mA VOL LOW Level Output Voltage IOL = 100 µA IOL = 8mA IOL = 12 mA IOL = 16 mA IOL = 24 mA II IOZ IOFF Input Leakage Current 3-STATE I/O Leakage Power-Off Leakage Current 0 VI 5.5V 0 VO 5.5V VI = VIH or VIL VI or VO = 5.5V Conditions VCC (V) 2.3 to 2.7 2.7 to 3.6 2.3 to 2.7 2.7 to 3.6 2.3 to 3.6 2.3 2.7 3.0 3.0 2.3 to 3.6 2.3 2.7 3.0 3.0 2.3 to 3.6 2.3 to 3.6 0 VCC - 0.2 1 .8 2.2 2.4 2.2 0 .2 0.6 0.4 0.4 0.55 ±5.0 ±5.0 10 µA µA µA V V TA = -40°C to +85°C M in 1 .7 2 .0 0 .7 0 .8 Max Units V V
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74LCX245
DC Electrical Characteristics
Symbol ICC ICC Parameter Quiescent Supply Current Increase in ICC per Input
(Continued)
VCC (V) 2.3 to 3.6 2.3 to 3.6 2.3 to 3.6 TA = -40°C to +85°C M in Max 10 ± 10 500 µA µA
Conditions VI = VCC or GND 3.6V VI, VO 5.5V (Note 8) VIH = VCC -0.6V
Units
Note 8: Outputs disabled or 3-STATE only.
AC Electrical Characteristics
TA = -40°C to +85°C, RL = 500 Symbol Parameter VCC = 3.3V ± 0.3V CL = 50 pF M in tPHL tPLH tPZL tPZH tPLZ tPHZ tOSHL tOSLH Output to Output Skew (Note 9) 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 7.0 7.0 8.5 8.5 7.5 7.5 1.0 1.0 M in 1.5 1.5 1.5 1.5 1.5 1.5 VCC = 2.7V CL = 50 pF Max 8.0 8.0 9.5 9.5 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 8.4 8.4 10.5 10.5 9.0 9.0 ns ns ns ns Units
Note 9: 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 = 25°C Typical 0.8 0.6 -0.8 -0.6 Units 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 7.0 8.0 25.0 Units pF pF pF
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74LCX245
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 = 3.3V ± 0.3V VCC x 2 at VCC = 2.5V ± 0.2V G ND
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 Vm o Vx Vy VC C 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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