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Semiconductor products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON
Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s
technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA
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is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
Revised April 2005
74VHC245
Octal Bidirectional Transceiver with 3-STATE Outputs
General Description
Features
The VHC245 is an advanced high speed CMOS octal bus
transceiver fabricated with silicon gate CMOS technology.
It achieves high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power
dissipation. The VHC245 is intended for bidirectional asynchronous communication between data busses. The direction of data transmission is determined by the level of the
T/R input. The enable input can be used to disable the
device so that the busses are effectively isolated. All inputs
are equipped with protection circuits against static discharge.
■ High Speed: tPD
4.0 ns (typ) at VCC
■ High Noise Immunity: VNIH
VNIL
5V
28% VCC (Min)
■ Power Down Protection is provided on all inputs
■ Low Noise: VOLP
0.9V (typ)
■ Low Power Dissipation:
ICC
4 PA (Max) @ TA
25qC
■ Pin and Function Compatible with 74HC245
Ordering Code:
Order Number
Package Number
74VHC245M
74VHC245SJ
74VHC245MTC
74VHC245N
Package Description
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
M20D
Pb-Free 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
MTC20
N20A
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Pb-Free package per JEDEC J-STD-020B.
Logic Symbol
Connection Diagram
IEEE/IEC
Truth Table
Pin Description
Pin
Inputs
Description
OE
Names
OE
Output Enable Input
T/R
Transmit/Receive Input
A0–A7
Side A Inputs or 3-STATE Outputs
B0–B7
Side B Inputs or 3-STATE Outputs
© 2005 Fairchild Semiconductor Corporation
DS011520
Outputs
T/R
L
L
Bus B Data to Bus A
L
H
Bus A Data to Bus B
H
X
HIGH-Z State
H HIGH Voltage Level L LOW Voltage Level X Immaterial
Any unused bus terminals during HIGH-Z State must be held HIGH or
LOW.
www.fairchildsemi.com
74VHC245 Octal Bidirectional Transceiver with 3-STATE Outputs
November 1992
74VHC245
Absolute Maximum Ratings(Note 1)
Recommended Operating
Conditions (Note 2)
0.5V to 7.0V
0.5V to 7.0V
0.5V to VCC 0.5V
20 mA
r20 mA
r25 mA
r75 mA
65qC to 150qC
Supply Voltage (VCC)
DC Input Voltage (VIN) (T/R, OE)
DC Output Voltage (VOUT)
Input Diode Current (IIK) (T/R, OE)
Output Diode Current (IOK)
DC Output Current (IOUT )
DC VCC/GND Current (ICC)
Storage Temperature (TSTG)
Supply Voltage (VCC)
0V to 5.5V
Output Voltage (VOUT)
0V to VCC
40qC to 85qC
Operating Temperature (TOPR)
Input Rise and Fall Time (tr, tf)
Lead Temperature (TL)
VCC
3.3V r 0.3V
0 a 100 ns/V
VCC
5.0V r 0.5V
0 a 20 ns/V
Note 1: Absolute Maximum Ratings are values beyond which the device
may be damaged or have its useful life impaired. The databook specifications should be met, without exception, to ensure that the system design is
reliable over its power supply, temperature, and output/input loading variables. Fairchild does not recommend operation outside databook specifications.
260qC
(Soldering, 10 seconds)
2.0V to 5.5V
Input Voltage (VIN)(T/R, OE)
Note 2: Unused inputs or I/O pins must be held HIGH or LOW. They may
not float.
DC Electrical Characteristics
Symbol
VIH
Parameter
HIGH Level
Input Voltage
VIL
LOW Level
Input Voltage
VOH
VOL
IOZ
TA
VCC
(V)
Min
25qC
Typ
TA
Max
40qC to 85qC
Min
2.0
1.50
1.50
3.0 5.5
0.7 VCC
0.7 VCC
Max
2.0
0.50
0.50
0.3 VCC
0.3 VCC
HIGH Level
2.0
1.9
2.0
1.9
3.0
2.9
3.0
2.9
4.5
4.4
4.5
3.0
2.58
2.48
4.5
3.94
3.80
V
VIN
V
VIH IOH
IOH
V
2.0
0.0
0.1
Output Voltage
3.0
0.0
0.1
0.1
4.5
0.0
0.1
0.1
3.0
0.36
0.44
4.5
0.36
0.44
0.1
IOH
VIN
V
VIH IOL
VIN
r0.25
5.5
r2.5
PA
(T/R, OE)
Current
ICC
Quiescent Supply Current
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8 mA
50 PA
IOL
4 mA
IOL
8 mA
VCC or GND
VCC or GND
VOUT
VIN OE
Input Leakage
4 mA
or VIL
V
3-STATE Output
IIN
50 PA
or VIL
4.4
LOW Level
Off-State Current
Conditions
V
3.0 5.5
Output Voltage
Units
VIH or VIL
0 5.5
r0.1
r1.0
PA
VIN
5.5V or GND
5.5
4.0
40.0
PA
VIN
VCC or GND
2
74VHC245
Noise Characteristics
Symbol
VOLP
Quiet Output Maximum
(Note 3)
Dynamic VOL
VOLV
Quiet Output Minimum
(Note 3)
VIHD
(Note 3)
VILD
(Note 3)
VCC
Parameter
TA
25qC
Units
Conditions
(V)
Typ
Limits
5.0
0.9
1.2
V
CL
50 pF
5.0
0.9
1.2
V
CL
50 pF
5.0
3.5
V
CL
50 pF
5.0
1.5
V
CL
50 pF
Dynamic VOL
Minimum HIGH Level
Dynamic Input Voltage
Maximum LOW Level
Dynamic Input Voltage
Note 3: Parameter guaranteed by design.
AC Electrical Characteristics
Symbol
VCC
Parameter
tPLH
Propagation Delay
tPHL
Time
(V)
3.3 r 0.3
5.0 r 0.5
tPZL
3-STATE Output
tPZH
Enable Time
3.3 r 0.3
5.0 r 0.5
25qC
TA
Min
Typ
TA
Max
40qC to 85qC
Min
Max
5.8
8.4
1.0
10.0
8.3
11.9
1.0
13.5
4.0
5.5
1.0
6.5
5.5
7.5
1.0
8.5
8.5
13.2
1.0
15.5
11.0
16.7
1.0
19.0
5.8
8.5
1.0
10.0
7.3
10.6
1.0
12.0
tPLZ
3-STATE Output
3.3 r 0.3
11.5
15.8
1.0
18.0
tPHZ
Disable Time
5.0 r 0.5
7.0
9.7
1.0
11.0
tOSLH
Output to Output
3.3 r 0.3
1.5
1.5
tOSHL
Skew
5.0 r 0.5
1.0
1.0
CIN
Input Capacitance
10
10
4
Units
Conditions
ns
ns
ns
RL
1 k:
ns
1 k:
CL
15 pF
CL
50 pF
CL
15 pF
CL
50 pF
CL
15 pF
CL
50 pF
CL
15 pF
CL
50 pF
CL
50 pF
CL
50 pF
CL
50 pF
CL
50 pF
ns
RL
ns
(Note 4)
pF
VCC
Open
5.0V
(T/R, OE)
CI/O
Output Capacitance
8
pF
VCC
CPD
Power Dissipation
21
pF
(Note 5)
Capacitance
Note 4: Parameter guaranteed by design. tOSLH
|tPLH max tPLH min|; t OSHL
|tPHL max tPHL min|
Note 5: CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load. Average
operating current can be obtained by the equation: ICC (opr.) CPD * VCC * fIN I CC/8 (per Bit).
3
www.fairchildsemi.com
74VHC245
Physical Dimensions inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
Package Number M20B
www.fairchildsemi.com
4
74VHC245
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Pb-Free 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
Package Number M20D
5
www.fairchildsemi.com
74VHC245
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
www.fairchildsemi.com
6
74VHC245 Octal Bidirectional Transceiver with 3-STATE Outputs
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
Package Number N20A
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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7
www.fairchildsemi.com
ON Semiconductor and
are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries.
ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent
coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein.
ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards,
regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer
application by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not
designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification
in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized
application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and
expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such
claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This
literature is subject to all applicable copyright laws and is not for resale in any manner.
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