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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
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© 2005 Fairchild Semiconductor Corporation DS01 1520 www.fairchildsemi.com
November 1992
Revised April 2005
74VHC245 Octal Bidirectional Transceiver with 3-STATE Outputs
74VHC245
Octal Bidirectional Transceiver with 3-STATE Outputs
General Descript ion
The VHC 245 is an advanced hi gh speed CMOS octa l bus
transceiver fabricated with silicon gate CMOS technology.
It achieves high speed operation similar to equivalent Bipo-
lar Schottky TTL while maintaining the CMOS low power
dissipation. T he VHC245 is inte nde d fo r b idi re ction al asy n-
chronous com munic ation b etween da ta busses. Th e dire c-
tion 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 dis-
charge.
Features
■High Speed: tPD
4.0 ns (typ) at VCC
5V
■High Noise Immunity: VNIH
VNIL
28% VCC (Min)
■Power Down Protection is provided on all inputs
■Low Noise: VOLP
0.9V (typ)
■Low Power Dissipatio n:
ICC
4
P
A (Max) @ TA
25
q
C
■Pin and Function Compatible with 74HC245
Ordering Code:
Surface m ount packa ges are also available on Tape and Reel . Specify by appending th e s uffix letter “X” to the ordering c ode.
Pb-Free package per JEDEC J-STD-020B.
Logic Symbol
IEEE/IEC
Pin Description
Connection Diagram
Truth Table
H
HIGH Voltage Leve l L
LOW Voltage Leve l X
Immaterial
Any unused bus terminals during HIGH-Z State must be held HIGH or
LOW.
Order Number Package Number Package Description
74VHC245M M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
74VHC245SJ M20D Pb-Free 20-Lead Small Outlin e Package (SOP), EIAJ TYPE II, 5.3mm Wide
74VHC245MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74VHC245N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
Pin Description
Names
OE Output Enable Input
T/R Transmit/Receive Input
A0–A7Side A Inputs or 3-STATE Outputs
B0–B7Side B Inputs or 3-STATE Outputs
Inputs Outputs
OE T/R
L L Bus B Data to Bus A
L H Bus A Data to Bus B
H X HIGH-Z State
www.fairchildsemi.com 2
74VHC245
Absolute Maximum Ratings(No t e 1) Recommended Operating
Conditions (Note 2)
Note 1: Absolute Maximum Ratings are values beyond which the device
may be damaged or have its useful life impaired. The databook specifica-
tions should be met, without exception, to ensure that the system design is
reliable over its power supply, temperature, and output/input loading vari-
ables. Fairchild does not recommend operation outside databook specifica-
tions.
Note 2: Unused inputs or I/O pins must be held HIGH or LOW. They may
not float.
DC Electrical Characteristics
Supply Voltage (VCC)
0.5V to
7.0V
DC Input Voltage (VIN) (T/R, OE)
0.5V to 7.0V
DC Output Voltage (VOUT)
0.5V to VCC
0.5V
Input Diode Current (IIK) (T/R, OE)
20 mA
Output Diode Current (IOK)
r
20 mA
DC Output Curren t (IOUT)
r
25 mA
DC VCC/GND Current (ICC)
r
75 mA
Storage Tem per atu re (TSTG)
65
q
C to
150
q
C
Lead Temperature (TL)
(Soldering, 10 seconds) 260
q
C
Supply Voltage (VCC) 2.0V to 5.5V
Input Voltage (VIN)(T/R, OE)0V to 5.5V
Output Voltage (VOUT) 0V to VCC
Operating Temperature ( T OPR)
40
q
C to
85
q
C
Input Rise and Fall Time (tr, tf)
VCC
3.3V
r
0.3V 0
a
100 ns/V
VCC
5.0V
r
0.5V 0
a
20 ns/V
Symbol Parameter VCC TA
25
q
CT
A
40
q
C to
85
q
CUnits Conditions
(V) Min Typ Max Min Max
VIH HIGH Level 2.0 1.50 1.50 V
Input V oltage 3.0
5.5 0.7 VCC 0.7 VCC
VIL LOW Level 2.0 0.50 0.50 V
Input V oltage 3.0
5.5 0.3 VCC 0.3 VCC
VOH HIGH Level 2.0 1.9 2.0 1.9 VIN
VIH IOH
50
P
A
Output Voltage 3.0 2.9 3.0 2.9 V or VIL
4.5 4.4 4.5 4.4
3.0 2.58 2.48 VIOH
4 mA
4.5 3.94 3.80 IOH
8 mA
VOL LOW Level 2.0 0.0 0.1 0.1 VIN
VIH IOL
50
P
A
Output Voltage 3.0 0.0 0.1 0.1 V or VIL
4.5 0.0 0.1 0.1
3.0 0.36 0.44 VIOL
4 mA
4.5 0.36 0.44 IOL
8 mA
IOZ 3-STATE Output VIN
VCC or GND
Off-State Current 5.5
r
0.25
r
2.5
P
AV
OUT
VCC or GND
VIN OE
VIH or VIL
IIN Input Leakage 0
5.5
r
0.1
r
1.0
P
AV
IN
5.5V or GND
(T/R, OE) Current
ICC Quiescent Supply Current 5.5 4.0 40.0
P
AV
IN
VCC or GND
3 www.fairchildsemi.com
74VHC245
Noise Characteri stics
Note 3: Parameter guaranteed by design.
AC Electrical Characteristics
Note 4: Parameter guaranteed by design. tOSLH
|tPLH max
tPLH min|; tOSHL
|tPHL max
tPHL min|
Note 5: CPD is defined as the v alue of the int ernal equiv alent capacita nc e w hich is ca lc ulated from th e operatin g c urrent consumption w it ho ut load. Average
operati ng c urrent can be obtained b y the equation: ICC (opr.)
CPD * VCC * fIN
ICC/8 (per Bit).
Symbol Parameter VCC TA
25
q
CUnits Conditions
(V) Typ Limits
VOLP Quiet Output Maximum 5.0 0.9 1.2 V CL
50 pF
(Note 3) Dynamic VOL
VOLV Quiet Output Minimum 5.0
0.9
1.2 V CL
50 pF
(Note 3) Dynamic VOL
VIHD Minimum HIGH Level 5.0 3.5 V CL
50 pF
(Note 3) Dynamic Input Voltage
VILD Maximum LOW Level 5.0 1.5 V CL
50 pF
(Note 3) Dynamic Input Voltage
Symbol Parameter VCC TA
25
q
CT
A
40
q
C to
85
q
CUnits Conditions
(V) Min Typ Max Min Max
tPLH Propagation Delay 3.3
r
0.3 5.8 8.4 1.0 10.0 ns CL
15 pF
tPHL Time 8.3 11.9 1.0 13.5 CL
50 pF
5.0
r
0.5 4.0 5.5 1.0 6.5 ns CL
15 pF
5.5 7.5 1.0 8.5 CL
50 pF
tPZL 3-STA TE Output 3.3
r
0.3 8.5 13.2 1.0 15.5 ns RL
1 k
:
CL
15 pF
tPZH Enable Time 11.0 16.7 1.0 19.0 CL
50 pF
5.0
r
0.5 5.8 8.5 1.0 10.0 ns CL
15 pF
7.3 10.6 1.0 12.0 CL
50 pF
tPLZ 3-STATE Output 3.3
r
0.3 11.5 15.8 1.0 18.0 ns RL
1 k
:
CL
50 pF
tPHZ Disable Time 5.0
r
0.5 7.0 9.7 1.0 11.0 CL
50 pF
tOSLH Output to Output 3.3
r
0.3 1.5 1.5 ns (Note 4) CL
50 pF
tOSHL Skew 5.0
r
0.5 1.0 1.0 CL
50 pF
CIN Input Capacit ance 4 10 10 pF VCC
Open
(T/R, OE)
CI/O Output Capacitance 8 pF VCC
5.0V
CPD Power Dissipation 21 pF (Note 5)
Capacitance
www.fairchildsemi.com 4
74VHC245
Physical Dimensions inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
Package Number M20B
5 www.fairchildsemi.com
74VHC245
Physical Dim ensions inches (millimeters) unless otherwise noted (Continued)
Pb-Free 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
Package Number M20D
www.fairchildsemi.com 6
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
7 www.fairchildsemi.com
74VHC245 Octal Bidirectional Transceiver with 3-STATE Outputs
Physical Dim ensions 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 assum e any responsibility for use of any circuitry described, no circuit patent lice nses 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 suppor t de vices o r syst ems are dev ic es or syste ms
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
instruct ions fo r use provided in the labe li ng, can be re a-
sonably expected to result in a significant injury to the
user.
2. A crit ical com ponen t in any com ponen t of a life s uppor t
device or system whose failure to perform can be rea-
sonabl y e xpec ted to cause the fa i lure of the life supp or t
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
www.onsemi.com
1
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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