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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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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 May 2005
MM74HCT245
Octal 3-STATE Transceiver
General Description
Features
The MM74HCT245 3-STATE bi-directional buffer utilizes
advanced silicon-gate CMOS technology and is intended
for two-way asynchronous communication between data
buses. It has high drive current outputs which enable high
speed operation even when driving large bus capacitances. This circuit possesses the low power consumption
of CMOS circuitry, yet has speeds comparable to low
power Schottky TTL circuits.
■ TTL input compatible
■ 3-STATE outputs for connection to system busses
■ High output drive current: 6 mA (min)
■ High speed: 16 ns typical propagation delay
■ Low power: 80 PA (74HCT Series)
This device is TTL input compatible and can drive up to 15
LS-TTL loads, and all inputs are protected from damage
due to static discharge by diodes to VCC and ground.
The MM74HCT245 has one active low enable input (G),
and a direction control (DIR). When the DIR input is HIGH,
data flows from the A inputs to the B outputs. When DIR is
LOW, data flows from B to A.
MM74HCT devices are intended to interface between TTL
and NMOS components and standard CMOS devices.
These parts are also plug-in replacements for LS-TTL
devices and can be used to reduce power consumption in
existing designs.
Ordering Code:
Order Number
Package Number
MM74HCT245WM
M20B
MM74HCT245SJ
MM74HCT245MTC
MM74HCT245N
M20D
MTC20
N20A
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
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
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Truth Table
Pin Assignments for DIP, SOIC, SOP and TSSOP
Control
Operation
Inputs
G
DIR
245
L
L
B data to A bus
L
H
A data to B bus
H
X
isolation
H HIGH Level
L LOW Level
X Irrelevant
Top View
© 2005 Fairchild Semiconductor Corporation
DS005366
www.fairchildsemi.com
MM74HCT245 Octal 3-STATE Transceiver
February 1984
MM74HCT245
Logic Diagram
www.fairchildsemi.com
2
Recommended Operating
Conditions
0.5 to 7.0V
1.5 to VCC 1.5V
0.5 to VCC 0.5V
r20 mA
r35 mA
r70 mA
65qC to 150qC
Supply Voltage (VCC )
DC Input Voltage (VIN)
DC Output Voltage (VOUT)
Clamp Diode Current (IIK, IOK)
DC Output Current,
DC VCC or GND Current, per pin (ICC)
Storage Temperature Range (TSTG)
Supply Voltage (VCC)
600 mW
S.O. Package only
500 mW
Max
Units
4.5
5.5
V
0
VCC
V
40
85
qC
500
ns
DC Input or Output Voltage
(VIN, VOUT)
Operating Temperature Range (TA)
Input Rise or Fall Times
(tr, tf)
Power Dissipation (PD)
(Note 3)
Min
Note 1: Absolute Maximum Ratings are those values beyond which damage to the device may occur.
Note 2: Unless otherwise specified all voltages are referenced to ground.
Note 3: Power Dissipation temperature derating — plastic “N” package:
12 mW/qC from 65qC to 85qC.
Lead Temperature (TL)
260qC
(Soldering 10 seconds)
DC Electrical Characteristics
(VCC
5V r 10%, unless otherwise specified.)
Symbol
VIH
Parameter
TA
Conditions
25qC
Typ
Minimum HIGH Level
TA
40 to 85qC TA 55 to 125qC
Guaranteed Limits
Units
2.0
2.0
2.0
V
0.8
0.8
0.8
V
Input Voltage
VIL
Maximum LOW Level
Input Voltage
VOH
Minimum HIGH Level
VIN
Output Voltage
|IOUT |
VIH or VIL
20 PA
VCC
VCC 0.1
VCC 0.1
VCC 0.1
V
|IOUT |
6.0 mA, VCC
4.5V
4.2
3.98
3.84
3.7
V
7.2 mA, VCC
5.5V
5.2
4.98
4.84
4.7
V
|IOUT |
VOL
Maximum LOW Level
VIN
VIH or VIL
Voltage
|IOUT |
20 PA
0
0.1
0.1
0.1
V
|IOUT |
6.0 mA, VCC
4.5V
0.2
0.26
0.33
0.4
V
7.2 mA, VCC
5.5V
0.2
0.26
0.33
0.4
V
r0.1
r1.0
r1.0
PA
r0.5
r5.0
r10
PA
8
80
160
PA
1.0
1.3
1.5
mA
|IOUT |
IIN
IOZ
Maximum Input
VIN
VCC or GND,
Current
VIH or VIL, Pin 1 or 19
Maximum 3-STATE
VOUT
Output Leakage
G
VCC or GND
VIH
Current
ICC
Maximum Quiescent
VIN
Supply Current
IOUT
VIN
VCC or GND
0 PA
2.4V or 0.5V (Note 4)
0.6
Note 4: Measured per input. All other inputs at VCC or ground.
3
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MM74HCT245
Absolute Maximum Ratings(Note 1)
(Note 2)
MM74HCT245
AC Electrical Characteristics
VCC
5.0V, tr
tf
Symbol
tPHL, tPLH
25qC (unless otherwise specified)
6 ns, TA
Parameter
Conditions
Maximum Output
Typ
Guaranteed
Limit
Units
CL
45 pF
16
20
ns
Maximum Output
CL
45 pF
29
40
ns
Enable Time
RL
1 k:
Maximum Output
CL
5 pF
20
25
ns
Disable Time
RL
1 k:
Propagation Delay
tPZL, tPZH
tPLZ, tPHZ
AC Electrical Characteristics
VCC
5.0V r 10%, tr
Symbol
tf
6 ns (unless otherwise specified)
Parameter
TA
Conditions
25qC
Typ
tPHL, tPLH
tPZL
tPZH
tPHZ, tPLZ
tTHL, tTLH
TA
40 to 85qC TA 55 to 125qC
Units
Guaranteed Limits
Maximum Output
CL
50 pF
17
23
29
34
ns
Propagation Delay
CL
150 pF
24
30
38
45
ns
Maximum Output
RL
1 k:
31
42
53
63
ns
Enable Time
CL
50 pF
Maximum Output
RL
1 k:
23
33
41
49
ns
Enable Time
CL
50 pF
Maximum Output
RL
1 k:
21
30
38
45
ns
Disable Time
CL
50 pF
Maximum Output
CL
50 pF
8
12
15
18
ns
10
15
15
15
pF
20
25
25
25
pF
Rise and Fall Time
CIN
Maximum Input
Capacitance
COUT
Maximum Output/Input
Capacitance
CPD
Power Dissipation
G
VCC (Note 5)
Capacitance
G
GND
Note 5: CPD determines the no load power consumption, PD
IS CPD V CC f ICC.
www.fairchildsemi.com
7
pF
100
pF
CPD VCC2 f I CCVCC, and the no load dynamic current consumption,
4
MM74HCT245
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
MM74HCT245
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
Package Number M20D
www.fairchildsemi.com
6
MM74HCT245
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
MM74HCT245 Octal 3-STATE Transceiver
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.
www.fairchildsemi.com
www.fairchildsemi.com
8
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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