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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
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
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© 2005 Fairchild Semiconductor Corporation DS01 1522 www.fairchildsemi.com
November 1992
Revised April 2005
74VHC244 Octal Buffer/Line Driver with 3-STATE Outputs
74VHC244
Octal Buffer/Line Driver with 3-STATE Outputs
General Descript ion
The VHC 244 is an advanced hi gh speed CMOS octa l bus
buffer fabricated with silicon gate CMOS technology. It
achieves high speed operation similar to equivalent Bipolar
Schottky TTL while maintaining the CMOS low power dissi-
pation. The VHC244 is a non-inverting 3-ST ATE buffer hav-
ing two active-LOW output enables. These devices are
designe d to be used as 3-STATE memory addre ss drivers,
clock drivers, and bus oriented transmitter/receivers.
An input protection circuit ensures that 0V to 7V can be
applied to the input pins witho ut regard to the supply volt-
age. This device can be used to interface 5V to 3V systems
and two supp ly systems such as battery back up. This cir-
cuit preven ts device destruc tion du e to mismatch ed supply
and input voltages.
Features
■High Speed: tPD
3.9ns (typ) at VCC
5V
■High noise immunity: VNIH
VNIL
28% VCC (min)
■Power down protection is provided on all inputs
■Low noise: VOLP
0.6V (typ)
■Low power dissipation: ICC
4
P
A (max) @ TA
25
q
C
■Pin and function compatible with 74HC244
Ordering Code:
Surface m ount packages are al so av ailable on Tape and Ree l. Specify by appending the suffix let t er “X” to the ordering code.
Pb-Free package per JEDEC J-STD-020B.
Logic Symbol
IEEE/IEC
Connection Diagram
Order Number Package Number Package Description
74VHC244M M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
74VHC244SJ M20D Pb-Free 20-Lead Small Outlin e Package (SOP), EIAJ TYPE I I, 5.3mm Wide
74VHC244MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74VHC244N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
www.fairchildsemi.com 2
74VHC244
Pin Descriptions
Truth Tables
H
HIGH Volt age Level
L
LOW Voltage Level
I
Immaterial
Z
High Impedanc e
Pin Names Description
OE1, OE23-STATE Ou tput Enable Inputs
I0–I7Inputs
O0–O73-STATE Outputs
Inputs Outputs
OE1In(Pins 12, 14, 16, 18)
LL L
LH H
HX Z
Inputs Outputs
OE2In(Pins 3, 5, 7, 9)
LL L
LH H
HX Z
3 www.fairchildsemi.com
74VHC244
Absolute Maxim um Ratings(Note 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 must b e held HIGH or LOW. They may not float.
DC Electrical Characteristics
Noise Characteri stics
Note 3: Parameter guaranteed by design.
Supply Voltage (VCC)
0.5V to
7.0V
DC Input Voltage (VIN)
0.5V to
7.0V
DC Output Voltage (VOUT)
0.5V to VCC
0.5V
Input Diode Current (IIK)
20 mA
Output Diode Current (IOK)
r
20 mA
DC Output Current (IOUT)
r
25 mA
DC VCC/GND Current (ICC)
r
75 mA
Storage Temperature (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)0V to
5.5V
Output Voltage (VOUT)0V to V
CC
Operating Temperature (TOPR)
40
q
C to
85
q
C
Input Rise and Fall Time (tr, tf)
VCC
3.3V
r
0.3V 0 ns/V
a
100 ns/V
VCC
5.0V
r
0.5V 0 ns/V
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 1.5 1.5 V
Input Voltage 3.0
5.5 0.7 VCC 0.7 VCC
VIL LOW Level 2.0 0.5 0.5 V
Input Voltage 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 5.5
r
0.25
r
2.5
P
AV
IN
VIH or VIL
Off-State Current VOUT
VCC or GND
IIN Input Leakage Current 0
5.5
r
0.1
r
1.0
P
AV
IN
5.5V or GND
ICC Quiescent Supply Current 5.5 4.0 40.0
P
AV
IN
VCC or GND
Symbol Parameter VCC TA
25
q
CUnits Conditions
(V) Typ Limits
VOLP Quiet Output Maximum 5.0 0.6 0.9 V CL
50 pF
(Note 3) Dynamic VOL
VOLV Quiet Output Minimum 5.0
0.6
0.9 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 HIGH Level 5.0 1.5 V CL
50 pF
(Note 3) Dynamic Input Voltage
www.fairchildsemi.com 4
74VHC244
AC Electrical Characteristics
Note 4: Parameter guaranteed by design. tOSLH
|tPLHmax
tPLHmin|; tOSHL
|tPHLmax
tPHLmin|.
Note 5: CPD is defined as t he value of t he internal equivalent capacitanc e w hich is calculated f rom the operating c urrent cons umption w it hout load. Average
operating current can be obtained by the equation: ICC (OPR.)
CPD * VCC * fIN
ICC/8 (per bit).
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 3.9 5.5 1.0 6.5 ns CL
15 pF
5.4 7.5 1.0 8.5 CL
50 pF
tPZL 3-STA TE Output 3.3
r
0.3 6.6 10.6 1.0 12.5 ns RL
1 k
:
CL
15 pF
tPZH Enable Time 9.1 14.1 1.0 16.0 CL
50 pF
5.0
r
0.5 4.7 7.3 1.0 8.5 ns CL
15 pF
6.2 9.3 1.0 10.5 CL
50 pF
tPLZ 3-STATE Output 3.3
r
0.3 10.3 14.0 1.0 16.0 ns RL
1 k
:
CL
50 pF
tPHZ Disable Time 5.0
r
0.5 6.7 9.2 1.0 10.5 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
COUT Output Capacitance 6 pF VCC
5.0V
CPD Power Dissipation Capacitance 19 pF (Note 5)
5 www.fairchildsemi.com
74VHC244
Physical Dim ensions inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
Package Number M20B
www.fairchildsemi.com 6
74VHC244
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
7 www.fairchildsemi.com
74VHC244
Physical Dim ensions inches (millimeters) unless otherwise noted (Continued)
20-Lea d Th in S hri nk Sm all Ou tlin e Pack age (TSSOP), JE DE C MO-1 53, 4.4mm Wide
Package Number MTC20
www.fairchildsemi.com 8
74VHC244 Octal Buffer/Line Driver with 3-STATE Output s
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 no t assume any responsibility for use of any circui try 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 suppor t de vices o r systems a re devices 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
instructions for use provided in the labeling, can be rea-
sonably expected to result in a significant injury to the
user.
2. A critical compon ent in any componen t of a life support
device or system whose failu re to perform can be rea-
sonabl y ex pect ed to cause the fa i lure of the li fe su pp ort
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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