Revised April 2005
74VCX245
Low Voltage Bidirectional Transceiver
with 3.6V Tolerant Inputs and Outputs
General Description
Features
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.
■ 1.4V to 3.6V VCC supply operation
The 74VCX245 is designed for low voltage (1.4V to 3.6V)
VCC applications with I/O compatibility up to 3.6V.
■ tPD
The 74VCX245 is fabricated with an advanced CMOS
technology to achieve high-speed operation while maintaining low CMOS power dissipation.
■ Static Drive (IOH/IOL)
■ 3.6V tolerant inputs and outputs
■ Power-off high impedance inputs and outputs
■ Supports Live Insertion and Withdrawal (Note 1)
3.5 ns max for 3.0V to 3.6V VCC
r24 mA @ 3.0V VCC
■ Uses patented noise/EMI reduction
circuitry
■ Latchup performance exceeds 300 mA
■ ESD performance:
Human body model ! 2000V
Machine model ! 200V
■ 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
Package
Number
74VCX245WM
(Note 2)
M20B
74VCX245BQX
(Note 3)
MLP020B
74VCX245MTC
(Note 2)
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
© 2005 Fairchild Semiconductor Corporation
DS500167
Description
OE
Output Enable Input (Active LOW)
T/R
Transmit/Receive Input
A0–A7
Side A Inputs or 3-STATE Outputs
B0–B7
Side B Inputs or 3-STATE Outputs
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74VCX245 Low Voltage Bidirectional Transceiver with 3.6V Tolerant Inputs and Outputs
June 1999
74VCX245
Connection Diagrams
Truth Table
Pin Assignments for SOIC and TSSOP
Inputs
OE
Outputs
T/R
L
L
L
H
Bus B0–B7 Data to Bus A0–A7
Bus A0–A7 Data to Bus B0–B7
H
X
HIGH Z State on A0–A7, B0–B7 (Note 4)
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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2
Recommended Operating
Conditions (Note 7)
0.5V to 4.6V
0.5V to 4.6V
Supply Voltage (VCC)
DC Input Voltage (VI)
Power Supply
DC Output Voltage (VO)
Outputs 3-STATE
Outputs Active (Note 6)
DC Input Diode Current (IIK) VI 0V
0.5V to 4.6V
0.5V to VCC 0.5V
50 mA
50 mA
50 mA
VO ! VCC
(IOH/IOL)
Storage Temperature (TSTG)
Output in Active States
0V to VCC
Output in 3-STATE
0V to 3.6V
Output Current in IOH/IOL
DC Output Source/Sink Current
DC VCC or Ground Current
1.4V to 3.6V
0.3V to 3.6V
Output Voltage (VO)
DC Output Diode Current (IOK)
VO 0V
Operating
Input Voltage
r50 mA
r100 mA
65qC to 150qC
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)
r24 mA
r18 mA
r6 mA
r2 mA
40qC to 85qC
Minimum Input Edge Rate ('t/'V)
VIN
0.8V to 2.0V, VCC
3.0V
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
VIL
Parameter
Conditions
HIGH Level Input Voltage
VCC
(V)
2.7 to 3.6
LOW Level Input Voltage
Min
HIGH Level Output Voltage
1.6
1.65 to 2.3
0.65 u VCC
1.4 to 1.6
0.65 u VCC
2.7 to 3.6
V
0.8
2.3 to 2.7
0.7
1.65 to 2.3
0.35 u V CC
V
0.35 u V CC
IOH
100 PA
2.7 to 3.6
VCC 0.2
IOH
12 mA
2.7
2.2
IOH
18 mA
3.0
2.4
IOH
24 mA
3.0
2.2
IOH
100 PA
2.3 to 2.7
VCC 0.2
IOH
6 mA
2.3
2.0
IOH
12 mA
2.3
1.8
IOH
18 mA
2.3
1.7
IOH
100 PA
1.65 to 2.3
VCC 0.2
IOH
6 mA
IOH
100 PA
IOH
2 mA
3
Units
2.0
2.3 to 2.7
1.4 to 1.6
VOH
Max
1.65
1.25
1.4 to 1.6
VCC 0.2
1.4
1.05
V
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74VCX245
Absolute Maximum Ratings(Note 5)
74VCX245
DC Electrical Characteristics
Symbol
(Continued)
Parameter
VCC
Conditions
Min
Max
Units
(V)
VOL
LOW Level Output Voltage
IOL
100 PA
2.7 to 3.6
0.2
IOL
12 mA
2.7
0.4
IOL
18 mA
3.0
0.4
IOL
24 mA
3.0
0.55
IOL
100 PA
2.3 to 2.7
0.2
IOL
12 mA
2.3
0.4
IOL
18 mA
2.3
0.6
IOL
100 PA
1.65 to 2.3
0.2
IOL
6 mA
1.65
0.3
IOL
100 PA
IOL
2 mA
II
Input Leakage Current
0 d VI d 3.6V
IOZ
3-STATE Output Leakage
0 d VO d 3.6V
IOFFI
Power-OFF Leakage Current
0 d (VI, VO) d 3.6V
ICC
Quiescent Supply Current
VI
VI
VIH or VIL
VCC or GND
VCC d (VI, VO) d 3.6V (Note 8)
'ICC
Increase in ICC per Input
VIH
VCC 0.6V
V
1.4 to 1.6
0.2
1.4
0.35
1.4 to 3.6
r5.0
PA
1.4 to 3.6
r10
PA
0
10
PA
1.4 to 3.6
20
1.4 to 3.6
r20
2.7 to 3.6
750
PA
PA
Note 8: Outputs disabled or 3-STATE only.
AC Electrical Characteristics
Symbol
tPHL, tPLH
Parameter
Propagation Delay
(Note 9)
Conditions
CL
30 pF, RL
500:
An to Bn or Bn to An
tPZL, tPZH
tPLZ, tPHZ
Output Enable Time
Output Disable Time
tOSHL
Output to Output Skew
tOSLH
(Note 10)
TA
40qC to 85qC
(V)
Min
Max
3.3 r 0.3
0.6
3.5
2.5 r 0.2
0.8
4.2
1.8 r 0.15
1.5
8.4
CL
15 pF, RL
2k:
1.5 r 0.1
1.0
16.8
CL
30 pF, RL
500:
3.3 r 0.3
0.6
4.5
2.5 r 0.2
0.8
5.6
1.8 r 0.15
1.5
9.8
CL
15 pF, RL
2k:
1.5 r 0.1
1.0
19.6
CL
30 pF, RL
500:
3.3 r 0.3
0.6
3.6
2.5 r 0.2
0.8
4.0
1.8 r 0.15
1.5
7.2
1.5 r 0.1
1.0
14.4
CL
15 pF, RL
2k:
CL
30 pF, RL
500:
CL
Note 9: For CL
VCC
15 pF, RL
2k:
3.3 r 0.3
Units
Figure
Number
ns
Figures
1, 2
Figures
5, 6
ns
Figures
1, 3, 4
Figures
5, 7, 8
ns
Figures
1, 3, 4
Figures
5, 7, 8
0.5
2.5 r 0.2
0.5
1.8 r 0.15
0.75
1.5 r 0.1
1.5
ns
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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4
Symbol
VOLP
VOLV
VOHV
Parameter
Quiet Output Dynamic Peak VOL
Quiet Output Dynamic Valley VOL
Quiet Output Dynamic Valley VOH
VCC
(V)
Conditions
CL
CL
CL
30 pF, VIH
30 pF, VIH
30 pF, VIH
VCC, VIL
0V
VCC, V IL
VCC, V IL
0V
0V
TA
25qC
Typical
1.8
0.3
2.5
0.7
3.3
1.0
1.8
0.3
2.5
0.7
3.3
1.0
1.8
1.3
2.5
1.7
3.3
2.0
Units
V
V
V
Capacitance
Symbol
Parameter
TA
Conditions
25qC
Typical
Units
CIN
Input Capacitance
VI
0V or VCC, VCC
1.8V, 2.5V or 3.3V
6.0
CI/O
Input/Output Capacitance
VI
0V or VCC, VCC
1.8V, 2.5V or 3.3V
7.0
pF
CPD
Power Dissipation Capacitance
VI
0V or VCC, f
20.0
pF
5
10 MHz, VCC
1.8V, 2.5V or 3.3V
pF
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74VCX245
Dynamic Switching Characteristics
74VCX245
AC Loading and Waveforms (VCC 3.3V r 0.3V to 1.8V r 0.15V)
FIGURE 1. AC Test Circuit
TEST
SWITCH
tPLH, tPHL
Open
tPZL, tPLZ
6V at VCC
VCC x 2 at VCC
tPZH, tPHZ
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
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VCC
3.3V r 0.3V
2.5V r 0.2V
1.8V r 0.15V
Vmi
1.5V
VCC/2
VCC/2
Vmo
1.5V
VCC/2
VCC/2
VX
VOL 0.3V
VOL 0.15V
VOL 0.15V
VY
VOH 0.3V
VOH 0.15V
VOH 0.15V
6
74VCX245
AC Loading and Waveforms (VCC 1.5 r 0.1V)
TEST
SWITCH
tPLH, tPHL
Open
tPZL, tPLZ
1.5V r 0.1V
VCC x 2 at VCC
tPZH, tPHZ
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
VCC
Symbol
1.5V r 0.1V
VCC/2
Vmi
Vmo
VCC/2
VX
VOL 0.1V
VY
VOH 0.1V
7
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74VCX245
Tape and Reel Specification
Tape Format for DQFN
Package
Designator
BQX
Tape
Number
Cavity
Section
Cavities
Status
Cover Tape
Status
Leader (Start End)
125 (typ)
Empty
Sealed
Carrier
3000
Filled
Sealed
Trailer (Hub End)
75 (typ)
Empty
Sealed
TAPE DIMENSIONS inches (millimeters)
REEL DIMENSIONS inches (millimeters)
Tape Size
12 mm
A
B
C
D
N
W1
W2
13.0
0.059
0.512
0.795
2.165
0.488
0.724
(330.0)
(1.50)
(13.00)
(20.20)
(55.00)
(12.4)
(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
9
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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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10
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:
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.
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.
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74VCX245 Low Voltage Bidirectional Transceiver with 3.6V Tolerant Inputs and Outputs
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)