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© 2005 Fairchild Semiconductor Corporation DS005327 www.fairchildsemi.com
September 1983
Revised May 2005
MM74HC244 Octal 3-STATE Buffer
MM74HC244
Octal 3-STATE Buffer
General Descript ion
The MM74HC244 is a non-inverting buffer and has two
active low enables (1G and 2G); each enable indepen-
dently controls 4 buffers. This device does not have
Schmitt trigger inputs.
These 3-STATE buffers utilize advanced silicon-gate
CMOS technology and are general purpose high speed
non-inv erting b uffers. The y possess h igh dri ve cur rent ou t-
puts which ena bl e h igh sp ee d op eration even whe n dr iv ing
large bus capacitances. These circuits achieve speeds
comparable to low power Schottky devices, while retaining
the advantage of CMOS cir cuitry, i. e., hig h noise immu nity,
and low power consumption. All three devices have a
fanout of 15 LS-TTL equivalent inputs.
All inputs are protected from damage due to static dis-
charge by diodes to VCC and ground.
Features
■Typical propagation delay: 14 ns
■3-STATE outputs for connection to system buses
■Wide power supply range: 2–6V
■Low quiescen t supply cur ren t: 80
P
A
■Output current: 6 mA
Ordering Code:
Devices also available in Tape and R eel. Sp ec if y by appending the suffix lett er “X” to th e ordering co de.
Connection Diagram
Top View
Truth Table
H
HIGH Level
L
LOW Le vel
Z
High Impedance
Order Number Package Number Package Description
MM74HC244WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
MM74HC244SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
MM74HC244MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
MM74HC244N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
1G 1A 1Y 2G 2A 2Y
LLLLLL
LHHLHH
HLZHLZ
HHZHHZ
www.fairchildsemi.com 2
MM74HC244
Logic Diagram
3 www.fairchildsemi.com
MM74HC244
Absolute Maxim um Ratings(Note 1)
(Note 2) Recommended Operating
Conditions
Note 1: Absolute Maximum Ratings are those values beyond which dam-
age to the device may occur.
Note 2: Unl es s ot herwise spe c if ied all voltages are referenced to ground.
Note 3: Power Dis sipation tem perature d erating — plastic “N” pac kage:
12 mW/
q
C from 65
q
C to 85
q
C.
DC Electrical Characteristics (Note 4)
Note 4: For a power supply of 5V
r
10% t he w ors t ca se outp ut v oltag es (VOH, and VOL) occur for HC at 4.5V. T hus the 4.5 V values s hould be us ed when
designing with this supply. Worst case VIH and VIL occur at VCC
5.5V an d 4. 5V respe ctiv ely. (The VIH value at 5.5V is 3. 85V.) The w ors t c as e leakage c ur-
rent (IIN, ICC, and I OZ) oc c ur for CMO S at th e higher voltag e and so the 6.0 V v alues should be used .
Supply Voltage (VCC)
0.5 to
7.0V
DC Input Voltage (VIN)
1.5 to VCC
1.5V
DC Output Voltage (VOUT)
0.5 to VCC
0.5V
Clamp Diode Current (IIK, IOK)
r
20 mA
DC Output Current, per pin (IOUT)
r
35 mA
DC VCC or GND Current, per pin (ICC)
r
70 mA
Storage Temperature Range (TSTG)
65
q
C to
150
q
C
Power Dissipation (PD)
(Note 3) 600 mW
S.O. Package only 500 mW
Lead Temperature (TL)
(Soldering 10 seconds) 260
q
C
Min Max Units
Supply Voltage (VCC)26V
DC Input or Output Voltage
(VIN, VOUT)0V
CC V
Operating Temperature Range (TA)
40
85
q
C
Input Rise or Fall Times
(tr, tf) VCC
2.0V 1000 ns
VCC
4.5V 500 ns
VCC
6.0V 400 ns
Symbol Parameter Conditions VCC TA
25
q
CT
A
40 to 85
q
CT
A
55 to 125
q
CUnits
Typ Guaranteed Limits
VIH Minimum HI GH Level 2.0V 1.5 1.5 1.5 V
Input Voltage 4.5V 3.15 3.15 3.15 V
6.0V 4.2 4.2 4.2 V
VIL Maximum LOW Level 2.0V 0.5 0.5 0.5 V
Input Voltage 4.5V 1.35 1.35 1.35 V
6.0V 1.8 1.8 1.8 V
VOH Minimum HI GH Level VIN
VIH or VIL
Output Voltage |IOUT|
d
20
P
A 2.0V 2.0 1.9 1.9 1.9 V
4.5V 4.5 4.4 4.4 4.4 V
6.0V 6.0 5.9 5.9 5.9 V
VIN
VIH or VIL V
|IOUT|
d
6.0 mA 4.5V 4.2 3.98 3.84 3.7 V
|IOUT|
d
7.8 mA 6.0V 5.7 5.4 5.34 5.2 V
VOL Maximum LOW Level VIN
VIH or VIL
Output Voltage |IOUT|
d
20
P
A 2.0V 0 0.1 0.1 0.1 V
4.5V 0 0.1 0.1 0.1 V
6.0V 0 0.1 0.1 0.1 V
VIN
VIH or VIL
|IOUT|
d
6.0 mA 4.5V 0.2 0.26 0.33 0.4 V
|IOUT|
d
7.8 mA 6.0V 0.2 0.26 0.33 0.4 V
IIN Maximum Input VIN
VCC or GND 6.0V
r
0.1
r
1.0
r
1.0
P
A
Current
IOZ Maximum 3-STATE VIN
VIH, or VIL 6.0V
r
0.5
r
5
r
10
P
A
Output Leakage VOUT
VCC or GND
Current G
VIH
ICC Maximum Quiescent VIN
VCC or GND 6.0V 8.0 80 160
P
A
Supply Current IOUT
0
P
A
www.fairchildsemi.com 4
MM74HC244
AC Electrical Characteristics
VCC
5V, TA
25
q
C, tr
tf
6 ns
AC Electrical Characteristics
VCC
2.0V-6.0V, CL
50 pF, tr
tf
6 ns (unless otherwise specified)
Note 5: CPD determines the no load dy namic powe r c onsumptio n, PD
CPD VCC2f
ICC VCC, and th e no load dyna m ic c urrent cons um ption,
IS
CPD VCCf
ICC.
Symbol Parameter Conditions Typ Guaranteed Units
Limit
tPHL, tPLH Maximum Propagation CL
45 pF 14 20 ns
Delay
tPZH, tPZL Maximum Enable Delay RL
1 k
:
17 28 ns
to Active Output CL
45 pF
tPHZ, tPLZ Maximum Disable Delay RL
1 k
:
15 25 ns
from Active Output CL
5 pF
Symbol Parameter Conditions VCC TA
25
q
CT
A
40 to 85
q
C TA
55 to 125
q
CUnits
Typ Guar ant eed Lim i ts
tPHL, tPLH Maximum Propagation CL
50 pF 2.0V 58 115 145 171 ns
Delay CL
150 pF 2.0V 83 165 208 246 ns
CL
50 pF 4.5V 14 23 29 34 ns
CL
150 pF 4.5V 17 33 42 49 ns
CL
50 pF 6.0V 10 20 25 29 ns
CL
150 pF 6.0V 14 28 35 42 ns
tPZH, tPZL Maximum Output Enable RL
1 k
:
Time CL
50 pF 2.0V 75 150 189 224 ns
CL
150 pF 2.0V 100 200 252 298 ns
CL
50 pF 4.5V 15 30 38 45 ns
CL
150 pF 4.5V 30 40 50 60 ns
CL
50 pF 6.0V 13 26 32 38 ns
CL
150 pF 6.0V 17 34 43 51 ns
tPHZ, tPLZ Maximum Output Disable RL
1 k
:
2.0V 75 150 189 224 ns
Time CL
50 pF 4.5V 15 30 38 45 ns
6.0V 13 26 32 38 ns
tTLH, tTHL Maximum Output 2.0V 60 75 90 ns
Rise and Fall Time 4.5V 12 15 18 ns
6.0V 10 13 15 ns
CPD Power Dissipation (per buffer)
Capacitance (Note 5) G
VIH 12 pF
G
VIL 50 pF
CIN Maximum Input 5 10 10 10 pF
Capacitance
COUT Maximum Output 10 20 20 20 pF
Capacitance
5 www.fairchildsemi.com
MM74HC244
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
MM74HC244
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Small Outline Package (SOP ), EIAJ TYPE II, 5.3mm W ide
Package Number M20D
7 www.fairchildsemi.com
MM74HC244
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), JED EC MO-1 53, 4.4mm Wide
Package Number MTC20
www.fairchildsemi.com 8
MM74HC244 Octal 3-STATE Buffer
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 failure to perform can be rea-
sonabl y ex pect ed to cause the fa ilu re of the lif e su pp ort
device or system, or to affect it s 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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