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74VCXH245 Low Voltage Bidirectional Transceiver with Bushold
June 1999 Revised June 1999
74VCXH245 Low Voltage Bidirectional Transceiver with Bushold
General Description
The VCXH245 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 VCXH245 data inputs include active bushold circuitry, eliminating the need for external pull-up resistors to hold unused or floating data inputs at a valid logic level. The 74VCXH245 is designed for low voltage (1.65V to 3.6V) VCC applications. The 74VCXH245 is fabricated with an advanced CMOS technology to achieve high-speed operation while maintaining low CMOS power dissipation.
Features
s 1.65V-3.6V VCC supply operation s Bushold on data inputs eliminates the need for external pull-up/pull-down resistors s tPD 3.5 ns max for 3.0V to 3.6V VCC 4.2 ns max for 2.3V to 2.7V VCC 8.4 ns max for 1.65V to 1.95V VCC s Static Drive (IOH/IOL) 24 mA @ 3.0V VCC 18 mA @ 2.3V VCC 6mA @ 1.65V VCC s Uses patented Quiet Series noise/EMI reduction circuitry s Latchup performance exceeds 300 mA s ESD performance: Human body model > 2000V Machine model > 200V
Ordering Code:
Order Number 74VCXH245WM 74VCXH245MTC Package Number M20B MTC20 Package Description 20-Lead Small Outline Integrated Circuit, JEDEC MS-013, 0.300" Wide Body 20-Lead Thin Shrink Small Outline Package, 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 Bushold Inputs or 3-STATE Outputs Side B Bushold Inputs or 3-STATE Outputs
Quiet SeriesTM is a trademark of Fairchild Semiconductor Corporation.
(c) 1999 Fairchild Semiconductor Corporation
ds500198
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74VCXH245
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 Outputs
H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Z = High Impedance
Logic Diagram
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74VCXH245
Absolute Maximum Ratings(Note 1)
Supply Voltage (VCC) DC Input Voltage (VI) T/R, OE I/O Ports DC Output Voltage (VO)(Note 2) 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) 50 mA 100 mA -65C to +150C -50 mA +50 mA -0.5V to +4.6V -0.5V to VCC+ 0.5V -0.5V to VCC + 0.5V -50 mA -0.5V to +4.6V
Recommended Operating Conditions (Note 3)
Power Supply Operating Data Retention Only Input Voltage Output Voltage (VO) Output Current in IOH/IOL 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 10 ns/V
Note 1: 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 2: IO Absolute Maximum Rating must be observed. Note 3: Floating or unused control inputs must be held HIGH or LOW.
1.65V to 3.6V 1.2V to 3.6V -0.3V to VCC 0V to VCC 24 mA 18 mA 6 mA -40C to +85C
DC Electrical Characteristics
Symbol VIH VIL VOH Parameter HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Voltage
(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 0.2 0.4 0.4 0.55 5.0 75 -75 450 -450 10 20 750 A A A A A A 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 3.0 3.0 3.6 3.6 2.7-3.6 2.7-3.6 2.7-3.6
VOL
LOW Level Output Voltage
IOL = 100 A IOL = 12 mA IOL = 18 mA IOL = 24 mA
II II(HOLD) II(OD) IOZ ICC ICC
Input Leakage Current Bushold Input Minimum Drive Hold Current Bushold Input Over-Drive Current to Change State 3-STATE Output Leakage Quiescent Supply Current Increase in ICC per Input
VIN = VCC or GND VIN = 0.8V VIN = 2.0V (Note 4) (Note 5) VO = V CC or GND VI = V IH or VIL VI = V CC or GND VIH = VCC -0.6V
Note 4: An external driver must source at least the specified current to switch from LOW-to-HIGH. Note 5: An external driver must sink at least the specified current to switch from HIGH-to-LOW.
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74VCXH245
DC Electrical Characteristics
Symbol VIH VIL VOH Parameter HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Voltage
(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 0.2 0.4 0.6 5.0 45 -45 300 -300 10 20 A A A A A 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 2.3-2.7 2.3 2.3 2.7 2.7 2.3-2.7 2.3-2.7
VOL
LOW Level Output Voltage
IOL = 100 A IOL = 12 mA IOL = 18 mA
II II(HOLD) II(OD) IOZ ICC
Input Leakage Current Bushold Imput Minimum Drive Hold Current Bushold Input Over-Drive Current to Change State 3-STATE Output Leakage Quiescent Supply Current
VIN = VCC or GND VIN = 0.7V VIN = 1.6V (Note 6) (Note 7) VO = VCC or GND VI = VIH or VIL VI = VCC or GND
Note 6: An external driver must source at least the specified current to switch from LOW-to-HIGH. Note 7: An external driver must sink at least the specified current to switch from HIGH-to-LOW.
DC Electrical Characteristics
Symbol VIH VIL VOH VOL II II(HOLD) II(OD) IOZ ICC Parameter HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Voltage LOW Level Output Voltage Input Leakage Current Bushold Input Mimimum Drive Hold Current Bushold Input Over-Drive Current to Change State 3-STATE Output Leakage 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 0.2 0.3 5.0 25 -25 200 -200 10 20 Max Units V V V V A A A A A
IOH = -100 A IOH = -6 mA IOL = 100 A IOL = 6 mA VIN = VCC or GND VIN = 0.57V VIN = 1.07V (Note 8) (Note 9) VO = VCC or GND VI = VCC or GND
1.65-2.3 1.65 1.65-2.3 1.65 1.65-2.3 1.65 1.65 1.95 1.95 1.65-2.3 1.65-2.3
Note 8: An external driver must source at least the specified current to switch from LOW-to-HIGH. Note 9: An external driver must sink at least the specified current to switch from HIGH-to-LOW.
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74VCXH245
AC Electrical Characteristics (Note 10)
TA = -40C to +85C, CL = 30 pF, RL = 500 Symbol Parameter VCC = 3.3V 0.3V Min tPHL tPLH tPZL tPZH tPLZ tPHZ tOSHL tOSLH Output to Output Skew (Note 11) 0.5 0.5 0.75 Output Disable Time 0.6 3.6 0.8 4.0 1.5 7.2 Propagation Delay An to Bn or Bn to An Output Enable Time 0.6 4.5 0.8 5.6 1.5 9.8 0.6 Max 3.5 VCC = 2.5V 0.2V Min 0.8 Max 4.2 VCC = 1.8V 0.15V Min 1.5 Max 8.4 ns ns ns ns Units
Note 10: For CL = 50 pF, add approximately 300 ps to the AC maximum specification. Note 11: 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 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 pF pF pF Units
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74VCXH245
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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74VCXH245
Physical Dimensions inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit, JEDEC MS-013, 0.300" Wide Body Package Number M20B
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74VCXH245 Low Voltage Bidirectional Transceiver with Bushold
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Thin Shrink Small Outline Package, 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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