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74LCXP16245 Low Voltage 16-Bit Bidirectional Transceiver with 5V Tolerant Inputs/Outputs and Pull-Down Resistors
August 1998 Revised April 2001
74LCXP16245 Low Voltage 16-Bit Bidirectional Transceiver with 5V Tolerant Inputs/Outputs and Pull-Down Resistors
General Description
The LCXP16245 contains sixteen non-inverting bidirectional buffers with 3-STATE outputs and is intended for bus oriented applications. The device is designed for low voltage (2.5V or 3.3V) VCC applications with capability of interfacing to a 5V signal environment. The device is byte controlled. Each byte has separate control inputs which could be shorted together for full 16-bit operation. The T/R inputs determine the direction of data flow through the device. The OE inputs disable both the A and B ports by placing them in a high impedance state. In addition, A and B port datapath pins have built-in resistors to GND allowing the pins to float without any increase in ICC current. This feature is intended to address modular and space constrained applications where additional space consumed by external resistors is not available. The LCXP16245 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 I/O pull-down resistors terminate inactive busses ensuring a stable bus state s 5.5 ns tPD max (VCC = 3.3V), 20 A 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 Pinout compatible with 74 series 16245 s Latch-up performance exceeds 500 mA 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 74LCXP16245MEA 74LCXP16245MTD Package Number MS48A MTD48 Package Description 48-Lead Small Shrink Outline Package (SSOP), JEDEC MO-118, 0.300 Wide 48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code.
Logic Symbol
Pin Descriptions
Pin Names OEn T/Rn A0-A15 B0-B15 Description Output Enable Input Transmit/Receive Input Side A Inputs or 3-STATE Outputs Side B Inputs or 3-STATE Outputs
(c) 2001 Fairchild Semiconductor Corporation
DS500053
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74LCXP16245
Connection Diagram
Truth Tables
Inputs Outputs OE1 L L H T/R1 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) Outputs OE2 L L H T/R2 L H X Bus B8-B15 Data to Bus A8-A15 Bus A8-A15 Data to Bus B8-B15 HIGH Z State on A8-A15, B8-B15 (Note 2)
Inputs
H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Z = High Impedance Note 2: A and B port inputs are still active.
Functional Descriptions
The LCXP16245 contains sixteen non-inverting bidirectional buffers with 3-STATE outputs. the device is byte controlled. Each byte has separate control inputs which can be shorted together for full 16-bit operation. The T/R inputs determine the direction of data flow through the device. The OE inputs disable both the A and B ports by placing them in a high impedance state. The pulldown resistor (30K normal) to GND is active only when the outputs are 3-STATED (OE = HIGH). When the outputs become active (OE = LOW) the resistor is removed from the circuit.
Logic Diagram
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74LCXP16245
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
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
24 12 8 -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.
DC Electrical Characteristics
Symbol VIH VIL VOH Parameter HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Voltage IOH = -100 A IOH = -8 mA IOH = -12 mA IOH = -18 mA IOH = -24 mA VOL LOW Level Output Voltage IOL = 100 A IOL = 8 mA IOL = 12 mA IOL = 16 mA IOL = 24 mA II IOZ(L) IOZ(H) IOFF ICC Input Leakage Current 3-STATE I/O Leakage 3-STATE I/O Leakage Power-Off Leakage Current Quiescent Supply Current 0 VI 5.5V VI or VO = 0.0V VI or VO = 5.5V VI or VO = 5.5V VI = V CC or GND 3.6V V I, VO 5.5V (Note 5) 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 3.0 2.3 - 3.6 2.3 - 3.6 2.3 - 3.6 0 2.3 - 3.6 2.3 - 3.6 50 VCC - 0.2 1.8 2.2 2.4 2.2 0.2 0.6 0.4 0.4 0.55 5.0 5.0 500 10 20 20 A A A 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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74LCXP16245
DC Electrical Characteristics
Symbol ICC Parameter Increase in ICC per Input
(Continued)
VCC (V) 2.3 - 3.6 TA = -40C to +85C Min Max 500 A
Conditions VIH = V CC -0.6V
Units
Note 5: 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 6) 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 5.5 5.5 7.0 7.0 7.0 7.0 1.0 1.0 VCC = 2.7V CL = 50 pF Min 1.5 1.5 1.5 1.5 1.5 1.5 Max 6.0 6.0 8.0 8.0 7.5 7.5 VCC = 2.5V 0.2V CL = 50 pF Min 1.5 1.5 1.5 1.5 1.5 1.5 Max 6.6 6.6 9.1 9.1 8.4 8.4 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). Parameter guaranteed by design.
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, VIL = 0V CL = 30 pF, VIH = 2.5V, VIL = 0V VCC (V) 3.3 2.5 3.3 2.5 TA = 25C Typical 0.8 0.6 -0.8 -0.6 V V Units
Capacitance
Symbol CIN CI/O CPD Input Capacitance Input/Output Capacitance Power Dissipation Capacitance Parameter Conditions VCC = Open, V I = 0V or VCC VCC = 3.3V, V I = 0V or VCC VCC = 3.3V, V I = 0V or VCC, f = 10 MHz Typical 7 8 20 Units pF pF pF
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74LCXP16245
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 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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74LCXP16245
Schematic Diagram Generic for LCX Family
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74LCXP16245
Physical Dimensions inches (millimeters) unless otherwise noted
48-Lead Small Shrink Outline Package (SSOP), JEDEC MO-118, 0.300 Wide Package Number MS48A
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74LCXP16245 Low Voltage 16-Bit Bidirectional Transceiver with 5V Tolerant Inputs/Outputs and Pull-Down Resistors
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide Package Number MTD48
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 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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