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74VCX245 Low Voltage Bidirectional Transceiver with 3.6V Tolerant Inputs and Outputs
June 1999 Revised November 2001
74VCX245 Low Voltage Bidirectional Transceiver with 3.6V Tolerant Inputs and Outputs
General Description
The VCX245 contains eight non-inverting bidirectional buffers with 3-STATE outputs and is intended for bus oriented applications. The T/R input determines the direction of data flow. The OE input disables both the A and B ports by placing them in a high impedance state. The 74VCX245 is designed for low voltage (1.4V to 3.6V) VCC applications with I/O compatibility up to 3.6V. The 74VCX245 is fabricated with an advanced CMOS technology to achieve high-speed operation while maintaining low CMOS power dissipation.
Features
s 1.4V to 3.6V VCC supply operation s 3.6V tolerant inputs and outputs s Power-off high impedance inputs and outputs s Supports Live Insertion and Withdrawal (Note 1) s tPD 3.5 ns max for 3.0V to 3.6V VCC s Static Drive (IOH/IOL)
24 mA @ 3.0V VCC
s Uses patented noise/EMI reduction circuitry s Latchup performance exceeds 300 mA s ESD performance: Human body model > 2000V Machine model > 200V
Note 1: To ensure the high impedance state during power up and power down, OEn should be tied to VCC through a pull up resistor. The minimum value of the resistor is determined by the current sourcing capability of the driver.
Ordering Code:
Order Number 74VCX245WM 74VCX245MTC Package Number M20B MTC20 Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" 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
Pin Descriptions
Pin Names OE T/R A0-A7 B0-B7 Description Output Enable Input (Active LOW) Transmit/Receive Input Side A Inputs or 3-STATE Outputs Side B Inputs or 3-STATE Outputs
(c) 2001 Fairchild Semiconductor Corporation
ds500167
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74VCX245
Connection Diagram
Truth Table
Inputs 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 2) Outputs
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.
Logic Diagram
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74VCX245
Absolute Maximum Ratings(Note 3)
Supply Voltage (VCC) DC Input Voltage (VI) DC Output Voltage (VO) Outputs 3-STATE Outputs Active (Note 4) DC Input Diode Current (IIK) VI < 0V DC Output Diode Current (IOK) VO < 0V VO > VCC DC Output Source/Sink Current (IOH/IOL) DC VCC or Ground Current Storage Temperature (TSTG)
-0.5V to +4.6V -0.5V to +4.6V -0.5V to +4.6V -0.5V to VCC + 0.5V -50 mA -50 mA +50 mA 50 mA 100 mA -65C to +150C
Recommended Operating Conditions (Note 5)
Power Supply Operating Input Voltage Output Voltage (VO) Output in Active States Output in 3-STATE Output Current in IOH/IOL VCC = 3.0V to 3.6V VCC = 2.3V to 2.7V VCC = 1.65V to 2.3V VCC = 1.4V to 1.6V Free Air Operating Temperature (TA) Minimum Input Edge Rate (t/V) VIN = 0.8V to 2.0V, VCC = 3.0V 10 ns/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: Floating or unused inputs must be held HIGH or LOW.
1.4V to 3.6V
-0.3V to 3.6V
0V to VCC 0V to 3.6V
24 mA 18 mA 6 mA 2 mA -40C to +85C
DC Electrical Characteristics
Symbol VIH Parameter HIGH Level Input Voltage Conditions VCC (V) 2.7 - 3.6 2.3 - 2.7 1.65 - 2.3 1.4 - 1.6 VIL LOW Level Input Voltage 2.7-3.6 2.3-2.7 1.65-2.3 1.4 - 1.6 VOH HIGH Level Output Voltage IOH = -100 A IOH = -12 mA IOH = -18 mA IOH = -24 mA IOH = -100 A IOH = -6 mA IOH = -12 mA IOH = -18 mA IOH = -100 A IOH = -6 mA IOH = -100 A IOH = -2 mA 2.7-3.6 2.7 3.0 3.0 2.3-2.7 2.3 2.3 2.3 1.65-2.3 1.65 1.4 - 1.6 1.4 VCC - 0.2 2.2 2.4 2.2 VCC - 0.2 2.0 1.8 1.7 VCC - 0.2 1.25 VCC - 0.2 1.05 V Min 2.0 1.6 0.65 x VCC 0.65 x VCC 0.8 0.7 0.35 x V CC 0.35 x V CC V V Max Units
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74VCX245
DC Electrical Characteristics
Symbol VOL Parameter LOW Level Output Voltage
(Continued)
VCC (V) 2.7-3.6 2.7 3.0 3.0 2.3-2.7 2.3 2.3 1.65-2.3 1.65 1.4 - 1.6 1.4 1.4-3.6 1.4-3.6 0 1.4-3.6 1.4-3.6 2.7-3.6
Conditions IOL = 100 A IOL = 12 mA IOL = 18 mA IOL = 24 mA IOL = 100 A IOL = 12 mA IOL = 18 mA IOL = 100 A IOL = 6 mA IOL = 100 A IOL = 2 mA
Min
Max 0.2 0.4 0.4 0.55 0.2 0.4 0.6 0.2 0.3 0.2 0.35 5.0 10 10 20 20 750
Units
V
II IOZ IOFFI ICC ICC
Input Leakage Current 3-STATE Output Leakage Power-OFF Leakage Current Quiescent Supply Current Increase in ICC per Input
0 VI 3.6V 0 VO 3.6V VI = VIH or VIL 0 (VI, VO) 3.6V VI = VCC or GND VCC (VI, VO) 3.6V (Note 6) VIH = VCC -0.6V
A A A A A
Note 6: Outputs disabled or 3-STATE only.
AC Electrical Characteristics
Symbol tPHL, tPLH Parameter Propagation Delay An to Bn or Bn to An
(Note 7)
Conditions VCC (V) 3.3 0.3 2.5 0.2 1.8 0.15 TA = -40C to +85C Min 0.6 0.8 1.5 1.0 0.6 0.8 1.5 1.0 0.6 0.8 1.5 1.0 Max 3.5 4.2 8.4 16.8 4.5 5.6 9.8 19.6 3.6 4.0 7.2 14.4 0.5 0.5 0.75 1.5 ns ns Figures 1, 3, 4 Figures 5, 7, 8 ns Figures 1, 3, 4 Figures 5, 7, 8 ns Figures 1, 2 Figures 5, 6 Units Figure Number
CL = 30 pF, RL = 500
CL = 15 pF, RL = 2k tPZL, tPZH Output Enable Time CL = 30 pF, RL = 500
1.5 0.1 3.3 0.3 2.5 0.2 1.8 0.15
CL = 15 pF, RL = 2k tPLZ, tPHZ Output Disable Time CL = 30 pF, RL = 500
1.5 0.1 3.3 0.3 2.5 0.2 1.8 0.15
CL = 15 pF, RL = 2k tOSHL tOSLH Output to Output Skew (Note 8) CL = 15 pF, RL = 2k
Note 7: For CL = 50PF, add approximately 300 ps to the AC maximum specification.
1.5 0.1 3.3 0.3 2.5 0.2 1.8 0.15 1.5 0.1
CL = 30 pF, RL = 500
Note 8: 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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74VCX245
Dynamic Switching Characteristics
Symbol VOLP Parameter Quiet Output Dynamic Peak VOL Conditions CL = 30 pF, VIH = VCC, VIL = 0V VCC (V) 1.8 2.5 3.3 VOLV Quiet Output Dynamic Valley VOL CL = 30 pF, VIH = VCC, V IL = 0V 1.8 2.5 3.3 VOHV Quiet Output Dynamic Valley VOH CL = 30 pF, VIH = VCC, V IL = 0V 1.8 2.5 3.3 TA = 25C Typical 0.3 0.7 1.0 -0.3 -0.7 -1.0 1.3 1.7 2.0 V V V Units
Capacitance
Symbol CIN CI/O CPD Input Capacitance Input/Output Capacitance Power Dissipation Capacitance Parameter Conditions VI = 0V or VCC, VCC = 1.8V, 2.5V or 3.3V VI = 0V or VCC, VCC = 1.8V, 2.5V or 3.3V VI = 0V or VCC, f = 10 MHz, VCC = 1.8V, 2.5V or 3.3V TA = +25C Typical 6 7 20 Units pF pF pF
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74VCX245
AC Loading and Waveforms (VCC 3.3V 0.3V to 1.8V 0.15V)
FIGURE 1. AC Test Circuit TEST tPLH, tPHL tPZL, tPLZ tPZH, tPHZ SWITCH Open 6V at VCC = 3.3 0.3V; VCC x 2 at VCC = 2.5V 0.2V; 1.8V 0.15V GND
FIGURE 2. Waveform for Inverting and Non-inverting Functions
FIGURE 3. 3-STATE Output High Enable and Disable Times for Low Voltage Logic
FIGURE 4. 3-STATE Output Low Enable and Disable Times for Low Voltage Logic Symbol Vmi Vmo VX VY VCC 3.3V 0.3V 1.5V 1.5V VOL + 0.3V VOH - 0.3V 2.5V 0.2V VCC/2 VCC/2 VOL + 0.15V VOH - 0.15V 1.8V 0.15V VCC/2 VCC/2 VOL + 0.15V VOH - 0.15V
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74VCX245
AC Loading and Waveforms (VCC 1.5 0.1V)
TEST tPLH, tPHL tPZL, tPLZ tPZH, tPHZ
SWITCH Open VCC x 2 at VCC = 1.5 0.1V GND FIGURE 5. AC Test Circuit
FIGURE 6. Waveform for Inverting and Non-Inverting Functions
FIGURE 7. 3-STATE Output High Enable and Disable Times for Low Voltage Logic
FIGURE 8. 3-STATE Output Low Enable and Disable Times for Low Voltage Logic
Symbol Vmi Vmo VX VY
VCC 1.5V 0.1V VCC/2 VCC/2 VOL + 0.1V VOH - 0.1V
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74VCX245
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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74VCX245 Low Voltage Bidirectional Transceiver with 3.6V Tolerant Inputs and 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. 9 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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