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74VCX2245 Low Voltage Bidirectional Transceiver with 3.6V Tolerant Inputs and Outputs and 26 Series Resistors in B Outputs
June 1999 Revised June 1999
74VCX2245 Low Voltage Bidirectional Transceiver with 3.6V Tolerant Inputs and Outputs and 26 Series Resistors in B Outputs
General Description
The VCX2245 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 74VCX2245 is designed for low voltage (1.65V to 3.6V) VCC applications with I/O compatibility up to 3.6V. The VCX2245 is also designed with 26 series resistance in the B Port outputs. This design reduces line noise in applications such as memory address drivers, clock drivers, and bus transceivers transmitters The 74VCX2245 is fabricated with an advanced CMOS technology to achieve high-speed operation while maintaining low CMOS power dissipation.
Features
s s s s s 1.65V - 3.6V VCC supply operation 3.6V tolerant inputs and outputs 26 series resistors in B Port outputs Power-off high impedance inputs and outputs Supports Live Insertion and Withdrawal (Note 1)
s tPD (A to B) 4.4 ns max for 3.0V to 3.6V VCC 5.6 ns max for 2.3V to 2.7V VCC 9.8 ns max for 1.65V to 1.95V VCC s Static Drive (IOH/IOL B outputs): 12 mA @ 3.0V VCC 8 mA @ 2.3V VCC 3 mA @ 1.65V VCC s Uses patented Quiet SeriesTM 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 74VCX2245WM 74VCX2245MTC 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
Quiet SeriesTM is a trademark of Fairchild Semiconductor Corporation.
(c) 1999 Fairchild Semiconductor Corporation
ds500170
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74VCX2245
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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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) 100 mA -65C to +150C -50 mA +50 mA 50 mA -0.5V to +4.6V -0.5V to VCC + 0.5V -50 mA -0.5V to +4.6V -0.5V to +4.6V
Input Voltage Output Voltage (VO) Output in Active States Output in 3-STATE Output Current in IOH/IOL - A Outputs VCC = 3.0V to 3.6V VCC = 2.3V to 2.7V VCC = 1.65V to 2.3V Output Current in IOH/IOL - B Outputs VCC = 3.0V to 3.6V VCC = 2.3V to 2.7V VCC = 1.65V to 2.3V Free Air Operating Temperature (TA) Minimum Input Edge Rate (t/V) VIN = 0.8V to 2.0V, VCC = 3.0V
-0.3V to 3.6V 0V to VCC 0V to 3.6V 24 mA 18 mA 6 mA 12 mA 8 mA 3 mA -40C to +85C 10 ns/V
Recommended Operating Conditions (Note 5)
Power Supply Voltage (VCC) Operating Data Retention Only 1.65V to 3.6V 1.2V to 3.6V
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.
DC Electrical Characteristics
Symbol VIH VIL VOH Parameter HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Voltage A Outputs
(2.7V < VCC 3.6V)
Conditions VCC (V) 2.7-3.6 2.7-3.6 Min 2.0 0.8 VCC - 0.2 2.2 2.4 2.2 VCC-0.2 2.2 2.4 2.2 0.2 0.4 0.4 0.55 0.2 0.4 0.55 0.8 5.0 10 10 20 20 750 A A A A A V V V V Max Units V V
IOH = -100 A IOH = -12 mA IOH = -18 mA IOH = -24 mA
2.7-3.6 2.7 3.0 3.0 2.7-3.6 2.7 3.0 3.0 2.7-3.6 2.7 3.0 3.0 2.7-3.6 2.7 3.0 3.0 2.7-3.6 2.7-3.6 0 2.7-3.6 2.7-3.6 2.7-3.6
HIGH Level Output Voltage B Outputs
IOH = -100 A IOH = -6 mA IOH = -8 mA IOH = -12 mA
VOL
LOW Level Output Voltage A Outputs
IOL = 100 A IOL = 12 mA IOL = 18 mA IOL = 24 mA
LOW Level Output Voltage B Outputs
IOL = 100 A IOL = 6 mA IOL = 8 mA IOL = 12 mA
II IOZ IOFF 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 = V IH or VIL 0 (VI, VO) 5.5V VI = V CC or GND VCC (VI, VO) 3.6V (Note 6) VIH = VCC -0.6V
Note 6: Outputs disabled or 3-STATE only.
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74VCX2245
DC Electrical Characteristics
Symbol VIH VIL VOH Parameter HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Voltage A Outputs
(2.3V VCC 2.7V)
Conditions VCC (V) 2.3-2.7 2.3-2.7 Min 1.6 0.7 VCC - 0.2 2.0 1.8 1.7 VCC-2 2.0 1.8 1.7 0.2 0.4 0.6 0.2 0.4 0.6 5.0 10 10 20 20 A A A A V V V V Max Units V V
IOH = -100 A IOH = -6 mA IOH = -12 mA IOH = -18 mA
2.3-2.7 2.3 2.3 2.3 2.3-2.7 2.3 2.3 2.3 2.3-2.7 2.3 2.3 2.3-2.7 2.3 2.3 2.3-2.7 2.3-2.7 0 2.3-2.7 2.3-2.7
HIGH Level Output Voltage B Outputs
IOH = -100 A IOH = -4 mA IOH = -6 mA IOH = -8mA
VOL
LOW Level Output Voltage A Outputs LOW Level Output Voltage B Outputs
IOL = 100 A IOL = 12 mA IOL = 18 mA IOL = 100 A IOL = 6 mA IOL = 8 mA 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 7)
II IOZ IOFF ICC
Input Leakage Current 3-STATE Output Leakage Power Off Leakage Current Quiescent Supply Current
Note 7: Outputs disabled or 3-STATE only.
DC Electrical Characteristics
Symbol VIH VIL VOH Parameter HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Voltage A Outputs HIGH Level Output Voltage B Outputs VOL LOW Level Output Voltage A Outputs LOW Level Output Voltage B Outputs II IOZ IOFF ICC Input Leakage Current 3-STATE Output Leakage Power Off Leakage Current Quiescent Supply Current
(1.65V VCC < 2.3V)
Conditions VCC (V) 1.65-2.3 1.65-2.3 Min 0.65 x VCC 0.35 x VCC VCC - 0.2 1.25 VCC-0.2 1.25 0.2 0.3 0.2 0.3 5.0 10 10 20 20 A A A A V V V Max Units V V V
IOH = -100 A IOH = -6 mA IOH = -100 A IOH = -3 mA IOL = 100 A IOL = 6 mA IOL = 100A IOL = 3 mA 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 8)
1.65-2.3 1.65 1.65-2.3 1.65 1.65-2.3 1.65 1.65-2.3 1.65 1.65-2.3 1.65-2.3 0 1.65-2.3 1.65-2.3
Note 8: Outputs disabled or 3-STATE only.
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74VCX2245
AC Electrical Characteristics (Note 9)
TA = -40C to +85C, CL = 30 pF, RL = 500 Symbol Parameter VCC = 3.3V 0.3V Min tPHL tPLH tPHL tPLH tPZL tPZH tPZL tPZH tPLZ tPHZ tPLZ tPHZ tOSHL tOSLH Output to Output Skew (Note 10) 0.5 0.5 0.75 ns Output Disable Time, B to A 0.6 3.6 0.8 4.0 1.5 7.2 ns Output Disable Time, A to B 0.6 4.2 0.8 4.7 1.5 8.5 ns Output Enable Time, B to A 0.6 4.5 0.8 5.6 1.5 9.8 ns Output Enable Time, A to B 0.6 5.0 0.8 6.6 1.5 9.8 ns Propagation Delay, B to A 0.6 3.5 0.8 4.2 1.5 8.4 ns Propagation Delay, A to B 0.6 Max 4.4 VCC = 2.5V 0.2V Min 0.8 Max 5.6 VCC = 1.8V 0.15V Min 1.5 Max 9.8 ns Units
Note 9: For CL = 50 pF, add approximately 300 ps to the AC maximum specification. Note 10: 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 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 VOHV Quiet Output Dynamic Valley VOH, B to A Quiet Output Dynamic Valley VOH, A to B CL = 30 pF, VIH = VCC, V IL = 0V CL = 30 pF, VIH = VCC, V IL = 0V CL = 30 pF, VIH = VCC, V IL = 0V CL = 30 pF, VIH = VCC, V IL = 0V CL = 30 pF, VIH = VCC, VIL = 0V Conditions CL = 30 pF, VIH = VCC, VIL = 0V VCC (V) 1.8 2.5 3.3 1.8 2.5 3.3 1.8 2.5 3.3 1.8 2.5 3.3 1.8 2.5 3.3 1.8 2.5 3.3 TA = 25C Typical 0.3 0.7 1.0 0.2 0.45 0.65 -0.3 -0.7 -1.0 -0.2 -0.45 -0.65 1.3 1.7 2.0 1.5 2.0 2.5 V V V V V V Units
Capacitance
Symbol CIN CI/O CPD Parameter Input Capacitance Input/Output Capacitance Power Dissipation Capacitance 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 pF pF pF Units
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74VCX2245
AC Loading and Waveforms
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 3.3V 0.3V Vmi Vmo Vx Vy 1.5V 1.5V VOL + 0.3V VOH - 0.3V VCC 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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74VCX2245
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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74VCX2245 Low Voltage Bidirectional Transceiver with 3.6V Tolerant Inputs and Outputs 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. 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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