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74VCX245 Low Voltage Bidirectional Transceiver with 3.6V Tolerant Inputs and Outputs
June 1999 Revised April 2005
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)
r24 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
s Leadless DQFN Pb-Free package
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 (Note 2) 74VCX245BQX (Note 3) 74VCX245MTC (Note 2) Package Number M20B MLP020B MTC20 Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide Pb-Free 20-Terminal Depopulated Quad Very-Thin Flat Pack No Leads (DQFN), JEDEC MO-241, 2.5 x 4.5mm 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Pb-Free package per JEDEC J-STD-020B. 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,
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) 2005 Fairchild Semiconductor Corporation
DS500167
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74VCX245
Connection Diagrams
Pin Assignments for SOIC and TSSOP
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 4) Outputs
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.
Logic Diagram
Pin Assignment for DQFN
(Top Through View)
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74VCX245
Absolute Maximum Ratings(Note 5)
Supply Voltage (VCC) DC Input Voltage (VI) DC Output Voltage (VO) Outputs 3-STATE Outputs Active (Note 6) 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 r50 mA r100 mA 65qC to 150qC
Recommended Operating Conditions (Note 7)
Power Supply Operating Input Voltage Output Voltage (VO) Output in Active States Output in 3-STATE Output Current in IOH/IOL VCC VCC VCC VCC 3.0V to 3.6V 2.3V to 2.7V 1.65V to 2.3V 1.4V to 1.6V 0V to VCC 0V to 3.6V 1.4V to 3.6V
0.3V to 3.6V
Free Air Operating Temperature (TA) Minimum Input Edge Rate ('t/'V) VIN 0.8V to 2.0V, VCC 3.0V
r24 mA r18 mA r6 mA r2 mA 40qC to 85qC
10 ns/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: Floating or unused inputs must be held HIGH or LOW.
DC Electrical Characteristics
Symbol VIH Parameter HIGH Level Input Voltage Conditions VCC (V) 2.7 to 3.6 2.3 to 2.7 1.65 to 2.3 1.4 to 1.6 VIL LOW Level Input Voltage 2.7 to 3.6 2.3 to 2.7 1.65 to 2.3 1.4 to 1.6 VOH HIGH Level Output Voltage IOH IOH IOH IOH IOH IOH IOH IOH IOH IOH IOH IOH Min 2.0 1.6 0.65 u VCC 0.65 u VCC 0.8 0.7 0.35 u V CC 0.35 u V CC 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 V V Max Units
100 PA 12 mA 18 mA 24 mA 100 PA 6 mA 12 mA 18 mA 100 PA 6 mA 100 PA 2 mA
2.7 to 3.6 2.7 3.0 3.0 2.3 to 2.7 2.3 2.3 2.3 1.65 to 2.3 1.65 1.4 to 1.6 1.4
3
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74VCX245
DC Electrical Characteristics
Symbol VOL Parameter LOW Level Output Voltage IOL IOL IOL IOL IOL IOL IOL IOL IOL IOL IOL II IOZ IOFFI ICC Input Leakage Current 3-STATE Output Leakage Power-OFF Leakage Current Quiescent Supply Current Increase in ICC per Input
(Continued)
VCC (V) 100 PA 12 mA 18 mA 24 mA 100 PA 12 mA 18 mA 100 PA 6 mA 100 PA 2 mA 2.7 to 3.6 2.7 3.0 3.0 2.3 to 2.7 2.3 2.3 1.65 to 2.3 1.65 1.4 to 1.6 1.4 1.4 to 3.6 1.4 to 3.6 0 1.4 to 3.6 1.4 to 3.6 2.7 to 3.6 0.2 0.4 0.4 0.55 0.2 0.4 0.6 0.2 0.3 0.2 0.35 V
Conditions
Min
Max
Units
0 d VI d 3.6V 0 d VO d 3.6V VI VI VIH VIH or VIL VCC or GND VCC 0.6V 0 d (VI, VO) d 3.6V VCC d (VI, VO) d 3.6V (Note 8)
r5.0 r10
10 20
PA PA PA PA PA
r20
750
'ICC
Note 8: Outputs disabled or 3-STATE only.
AC Electrical Characteristics
Symbol tPHL, tPLH Parameter Propagation Delay An to Bn or Bn to An CL tPZL, tPZH Output Enable Time CL CL
(Note 9)
Conditions VCC (V) 3.3 r 0.3 2.5 r 0.2 1.8 r 0.15 TA
40qC to 85qC
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 0.6 0.8 1.5 1.0 0.6 0.8 1.5 1.0 0.6 0.8 1.5 1.0
Units
Figure Number Figures 1, 2 Figures 5, 6 Figures 1, 3, 4 Figures 5, 7, 8 Figures 1, 3, 4 Figures 5, 7, 8
Min
30 pF, RL
500:
ns
15 pF, RL 30 pF, RL
2k: 500:
1.5 r 0.1 3.3 r 0.3 2.5 r 0.2 1.8 r 0.15
ns
CL tPLZ, tPHZ Output Disable Time CL
15 pF, RL 30 pF, RL
2k: 500:
1.5 r 0.1 3.3 r 0.3 2.5 r 0.2 1.8 r 0.15
ns
CL tOSHL tOSLH Output to Output Skew (Note 10) CL
Note 9: For CL
15 pF, RL 30 pF, RL
2k: 500:
1.5 r 0.1 3.3 r 0.3 2.5 r 0.2 1.8 r 0.15
CL
ns
15 pF, RL
2k:
1.5 r 0.1
50PF, 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).
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74VCX245
Dynamic Switching Characteristics
Symbol VOLP Parameter Quiet Output Dynamic Peak VOL CL 30 pF, VIH Conditions 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 25qC Typical 0.3 0.7 1.0 V Units
0.3 0.7 1.0
1.3 1.7 2.0 V V
Capacitance
Symbol CIN CI/O CPD Input Capacitance Input/Output Capacitance Power Dissipation Capacitance Parameter VI VI VI 0V or VCC, VCC 0V or VCC, VCC 0V or VCC, f Conditions 1.8V, 2.5V or 3.3V 1.8V, 2.5V or 3.3V 1.8V, 2.5V or 3.3V TA
25qC
6.0 7.0 20.0
Typical
Units pF pF pF
10 MHz, VCC
5
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74VCX245
AC Loading and Waveforms (VCC 3.3V r 0.3V to 1.8V r 0.15V)
FIGURE 1. AC Test Circuit TEST tPLH, tPHL tPZL, tPLZ tPZH, tPHZ VCC x 2 at VCC SWITCH Open 6V at VCC 3.3V r 0.3V; 2.5V r 0.2V; 1.8V r 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 r 0.3V 1.5V 1.5V VOL 0.3V VOH 0.3V 2.5V r 0.2V VCC/2 VCC/2 VOL 0.15V VOH 0.15V 1.8V r 0.15V VCC/2 VCC/2 VOL 0.15V VOH 0.15V
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74VCX245
AC Loading and Waveforms (VCC 1.5 r 0.1V)
TEST tPLH, tPHL tPZL, tPLZ tPZH, tPHZ
SWITCH Open VCC x 2 at VCC GND FIGURE 5. AC Test Circuit 1.5V r 0.1V
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 r 0.1V VCC/2 VCC/2 VOL 0.1V VOH 0.1V
7
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74VCX245
Tape and Reel Specification
Tape Format for DQFN Package Designator BQX Tape Section Leader (Start End) Carrier Trailer (Hub End) TAPE DIMENSIONS inches (millimeters) Number Cavities 125 (typ) 3000 75 (typ) Cavity Status Empty Filled Empty Cover Tape Status Sealed Sealed Sealed
REEL DIMENSIONS inches (millimeters)
Tape Size 12 mm
A 13.0 (330.0)
B 0.059 (1.50)
C 0.512 (13.00)
D 0.795 (20.20)
N 2.165 (55.00)
W1 0.488 (12.4)
W2 0.724 (18.4)
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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
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Pb-Free 20-Terminal Depopulated Quad Very-Thin Flat Pack No Leads (DQFN), JEDEC MO-241, 2.5 x 4.5mm Package Number MLP020B
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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. 11 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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