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74AC245, 74ACT245
Octal Bidirectional Transceiver with 3-STATE
Inputs/Outputs
Features
General Description
■ ICC and IOZ reduced by 50%
■ Non-inverting buffers
The AC/ACT245 contains eight non-inverting bidirectional buffers with 3-STATE outputs and is intended for
bus-oriented applications. Current sinking capability is
24mA at both the A and B ports. The Transmit/Receive
(T/R) input determines the direction of data flow through
the bidirectional transceiver. Transmit (active-HIGH)
enables data from A ports to B ports; Receive (activeLOW) enables data from B ports to A ports. The Output
Enable input, when HIGH, disables both A and B ports
by placing them in a HIGH Z condition.
■ Bidirectional data path
■ A and B outputs source/sink 24mA
■ ACT245 has TTL-compatible inputs
Ordering Information
Package
Number
Package Description
74AC245SC
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
74AC245SJ
M20D
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
Order Number
74AC245MTC
MTC20
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153,
4.4mm Wide
74AC245PC
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
74ACT245SC
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
M20D
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74ACT245SJ
74ACT245MSA
MSA20
20-Lead Shrink Small Outline Package (SSOP), JEDEC MO-150, 5.3mm Wide
74ACT245MTC
MTC20
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153,
4.4mm Wide
74ACT245PC
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering number.
All packages are lead free per JEDEC: J-STD-020B standard.
©1988 Fairchild Semiconductor Corporation
74AC245, 74ACT245 Rev. 1.5.0
www.fairchildsemi.com
74AC245, 74ACT245 — Octal Bidirectional Transceiver with 3-STATE Inputs/Outputs
January 2008
Logic Symbol
IEEE/IEC
Pin Description
Pin
Names
Description
OE
Output Enable Input
T/R
Transmit/Receive Input
A0–A7
Side A 3-STATE Inputs or 3-STATE
Outputs
B0–B7
Side B 3-STATE Inputs or 3-STATE
Outputs
Truth Table
Inputs
OE
T/R
Outputs
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
©1988 Fairchild Semiconductor Corporation
74AC245, 74ACT245 Rev. 1.5.0
www.fairchildsemi.com
2
74AC245, 74ACT245 — Octal Bidirectional Transceiver with 3-STATE Inputs/Outputs
Connection Diagram
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only.
Symbol
VCC
IIK
Parameter
Rating
−0.5V to +7.0V
Supply Voltage
DC Input Diode Current
VI = −0.5V
−20mA
VI = VCC + 0.5
+20mA
VI
DC Input Voltage
−0.5V to VCC + 0.5V
IOK
DC Output Diode Current
VO = −0.5V
−20mA
VO = VCC + 0.5V
+20mA
VO
DC Output Voltage
−0.5V to VCC + 0.5V
IO
DC Output Source or Sink Current
±50mA
±50mA
ICC or IGND DC VCC or Ground Current per Output Pin
TSTG
Storage Temperature
TJ
−65°C to +150°C
140°C
Junction Temperature
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to absolute maximum ratings.
Symbol
VCC
Parameter
Supply Voltage
AC
2.0V to 6.0V
ACT
4.5V to 5.5V
VI
Input Voltage
VO
Output Voltage
TA
Operating Temperature
∆V / ∆t
Rating
0V to VCC
0V to VCC
−40°C to +85°C
Minimum Input Edge Rate, AC Devices:
125mV/ns
VIN from 30% to 70% of VCC, VCC @ 3.3V, 4.5V, 5.5V
∆V / ∆t
125mV/ns
Minimum Input Edge Rate, ACT Devices:
VIN from 0.8V to 2.0V, VCC @ 4.5V, 5.5V
©1988 Fairchild Semiconductor Corporation
74AC245, 74ACT245 Rev. 1.5.0
www.fairchildsemi.com
3
74AC245, 74ACT245 — Octal Bidirectional Transceiver with 3-STATE Inputs/Outputs
Absolute Maximum Ratings
TA = +25°C
Symbol
Parameter
VCC (V)
VIH
Minimum HIGH Level
Input Voltage
3.0
Conditions
VOUT = 0.1V or
VCC – 0.1V
Maximum LOW Level
Input Voltage
2.1
2.1
2.25
3.15
3.15
2.75
3.85
3.85
1.5
0.9
0.9
2.25
1.35
1.35
2.75
1.65
1.65
2.99
2.9
2.9
4.5
4.49
4.4
4.4
5.5
5.49
5.4
5.4
2.56
2.46
3.86
3.76
4.86
4.76
4.5
3.0
4.5
VOUT = 0.1V or
VCC – 0.1V
5.5
VOH
Minimum HIGH Level
Output Voltage
Guaranteed Limits
1.5
5.5
VIL
Typ.
TA = −40°C to +85°C
3.0
3.0
IOUT = –50µA
VIN = VIL or VIH,
Units
V
V
V
IOH = –12mA
4.5
VIN = VIL or VIH,
IOH = –24mA
5.5
VIN = VIL or VIH,
IOH =
VOL
Maximum LOW Level
Output Voltage
3.0
–24mA(1)
IOUT = 50µA
0.002
0.1
0.1
4.5
0.001
0.1
0.1
5.5
0.001
0.1
0.1
0.36
0.44
0.36
0.44
0.36
0.44
±0.1
±1.0
µA
3.0
VIN = VIL or VIH,
V
IOL = 12mA
4.5
VIN = VIL or VIH,
IOL = 24mA
5.5
VIN = VIL or VIH,
IOL =
24mA(1)
IIN(2)
Maximum Input
Leakage Current
5.5
VI = VCC, GND
IOLD
Minimum Dynamic
Output Current(3)
5.5
VOLD = 1.65V Max.
75
mA
5.5
VOHD = 3.85V Min.
−75
mA
Maximum Quiescent
Supply Current
5.5
VIN = VCC or GND
4.0
40.0
µA
Maximum I/O
Leakage Current
5.5
VI (OE) = VIL, VIH;
VI = VCC, GND;
VO = VCC, GND
±0.3
±3.0
µA
IOHD
ICC
(2)
IOZT
Notes:
1. All outputs loaded; thresholds on input associated with output under test.
2. IIN and ICC @ 3.0V are guaranteed to be less than or equal to the respective limit @ 5.5V VCC.
3. Maximum test duration 2.0ms, one output loaded at a time.
©1988 Fairchild Semiconductor Corporation
74AC245, 74ACT245 Rev. 1.5.0
www.fairchildsemi.com
4
74AC245, 74ACT245 — Octal Bidirectional Transceiver with 3-STATE Inputs/Outputs
DC Electrical Characteristics for AC
TA = +25°C
Symbol
Parameter
VCC (V)
VIH
Minimum HIGH Level
Input Voltage
4.5
5.5
Maximum LOW
Level Input Voltage
VIL
VOH
Minimum HIGH Level
Output Voltage
Conditions
Typ.
TA = −40°C to +85°C
Guaranteed Limits
VOUT = 0.1V or
VCC − 0.1V
1.5
2.0
2.0
1.5
2.0
2.0
VOUT = 0.1V or
VCC − 0.1V
1.5
0.8
0.8
5.5
1.5
0.8
0.8
4.5
IOUT = −50µA
4.49
4.4
4.4
4.5
5.5
4.5
5.49
VIN = VIL or VIH,
5.4
5.4
3.86
3.76
4.86
4.76
0.1
0.1
Units
V
V
V
IOH = −24mA
5.5
VIN = VIL or VIH,
IOH = −24mA(4)
VOL
Maximum LOW
Level Output Voltage
4.5
IOUT = 50µA
5.5
4.5
0.001
0.001
VIN = VIL or VIH,
0.1
0.1
0.36
0.44
0.36
0.44
±0.1
±1.0
V
IOL = 24mA
5.5
VIN = VIL or VIH,
IOL = 24mA(4)
IIN
Maximum Input
Leakage Current
5.5
VI = VCC, GND
µA
ICCT
Maximum ICC/Input
5.5
VI = VCC − 2.1V
1.5
mA
IOLD
Minimum Dynamic
Output Current(5)
5.5
VOLD = 1.65V Max.
75
mA
5.5
VOHD = 3.85V Min.
−75
mA
ICC
Maximum Quiescent
Supply Current
5.5
VIN = VCC or GND
4.0
40.0
µA
IOZT
Maximum I/O
Leakage Current
5.5
VI (OE) = VIL, VIH;
VI = VCC, GND;
VO = VCC, GND
±0.3
±3.0
µA
IOHD
0.6
Notes:
4. All outputs loaded; thresholds on input associated with output under test.
5. Maximum test duration 2.0ms, one output loaded at a time.
©1988 Fairchild Semiconductor Corporation
74AC245, 74ACT245 Rev. 1.5.0
www.fairchildsemi.com
5
74AC245, 74ACT245 — Octal Bidirectional Transceiver with 3-STATE Inputs/Outputs
DC Electrical Characteristics for ACT
TA = +25°C,
CL = 50pF
VCC (V)(6)
Min.
Propagation Delay,
An to Bn or Bn to An
3.3
1.5
5.0
5.0
1.5
Propagation Delay,
An to Bn or Bn to An
3.3
5.0
Output Enable Time
Symbol
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
Parameter
Output Enable Time
Output Disable Time
Output Disable Time
TA = −40°C to +85°C,
CL = 50pF
Typ. Max.
Min.
Max.
Units
8.5
1.0
9.0
ns
3.5
6.5
1.0
7.0
1.5
5.0
8.5
1.0
9.0
1.5
3.5
6.0
1.0
7.0
3.3
2.5
7.0
11.5
2.0
12.5
5.0
1.5
5.0
8.5
1.0
9.0
3.3
2.5
7.5
12.0
2.0
13.5
5.0
1.5
5.5
9.0
1.0
9.5
3.3
2.0
6.5
12.0
1.0
12.5
5.0
1.5
5.5
9.0
1.0
10.0
3.3
2.0
7.0
11.5
1.5
13.0
5.0
1.5
5.5
9.0
1.0
10.0
ns
ns
ns
ns
ns
Note:
6. Voltage range 3.3 is 3.3V ± 0.3V. Voltage range 5.0 is 5.0V ± 0.5V.
AC Electrical Characteristics for ACT
TA = +25°C,
CL = 50pF
Symbol
Parameter
TA = −40°C to +85°C,
CL = 50pF
VCC (V)(7)
Min.
Typ.
Max.
Min.
Max.
Units
tPLH
Propagation Delay,
An to Bn or Bn to An
5.0
1.5
4.0
7.5
1.5
8.0
ns
tPHL
Propagation Delay,
An to Bn or Bn to An
5.0
1.5
4.0
8.0
1.0
9.0
ns
tPZH
Output Enable Time
5.0
1.5
5.0
10.0
1.5
11.0
ns
tPZL
Output Enable Time
5.0
1.5
5.5
10.0
1.5
12.0
ns
tPHZ
Output Disable Time
5.0
1.5
5.5
10.0
1.0
11.0
ns
tPLZ
Output Disable Time
5.0
2.0
5.0
10.0
1.5
11.0
ns
Note:
7. Voltage range 5.0 is 5.0V ± 0.5V.
Capacitance
Symbol
Parameter
Conditions
Typ.
Units
CIN
Input Capacitance
VCC = OPEN
4.5
pF
CI/O
Input/Output Capacitance
VCC = 5.0V
15.0
pF
CPD
Power Dissipation Capacitance
VCC = 5.0V
45.0
pF
©1988 Fairchild Semiconductor Corporation
74AC245, 74ACT245 Rev. 1.5.0
www.fairchildsemi.com
6
74AC245, 74ACT245 — Octal Bidirectional Transceiver with 3-STATE Inputs/Outputs
AC Electrical Characteristics for AC
13.00
12.60
A
11.43
20
11
B
9.50
10.65 7.60
10.00 7.40
2.25
1
PIN ONE
INDICATOR
10
0.51
0.35
0.25
M
0.65
1.27
1.27
C B A
LAND PATTERN RECOMMENDATION
2.65 MAX
SEE DETAIL A
0.33
0.20
C
0.75
0.25
X 45°
SEATING PLANE
NOTES: UNLESS OTHERWISE SPECIFIED
(R0.10)
GAGE PLANE
(R0.10)
0.10 C
0.30
0.10
0.25
8°
0°
A) THIS PACKAGE CONFORMS TO JEDEC
MS-013, VARIATION AC, ISSUE E
B) ALL DIMENSIONS ARE IN MILLIMETERS.
C) DIMENSIONS DO NOT INCLUDE MOLD
FLASH OR BURRS.
D) CONFORMS TO ASME Y14.5M-1994
1.27
0.40
SEATING PLANE
E) LANDPATTERN STANDARD: SOIC127P1030X265-20L
(1.40)
DETAIL A
F) DRAWING FILENAME: MKT-M20BREV3
SCALE: 2:1
Figure 1. 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or
obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions,
specifically the warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/
©1988 Fairchild Semiconductor Corporation
74AC245, 74ACT245 Rev. 1.5.0
www.fairchildsemi.com
7
74AC245, 74ACT245 — Octal Bidirectional Transceiver with 3-STATE Inputs/Outputs
Physical Dimensions
74AC245, 74ACT245 — Octal Bidirectional Transceiver with 3-STATE Inputs/Outputs
Physical Dimensions (Continued)
Figure 2. 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or
obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions,
specifically the warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/
©1988 Fairchild Semiconductor Corporation
74AC245, 74ACT245 Rev. 1.5.0
www.fairchildsemi.com
8
74AC245, 74ACT245 — Octal Bidirectional Transceiver with 3-STATE Inputs/Outputs
Physical Dimensions (Continued)
Figure 3. 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or
obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions,
specifically the warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/
©1988 Fairchild Semiconductor Corporation
74AC245, 74ACT245 Rev. 1.5.0
www.fairchildsemi.com
9
26.92
24.89
7.11
6.09
PIN #1
(0.97)
1.78
1.14
2.54
0.36
0.56
.001[.025]
3.43
3.17
5.33 MAX
7° TYP
7.87
7° TYP
3.55
3.17
0.38 MIN
7.62
10.92 MAX
0.20
0.35
C
NOTES:
Figure 4. 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or
obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions,
specifically the warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/
©1988 Fairchild Semiconductor Corporation
74AC245, 74ACT245 Rev. 1.5.0
www.fairchildsemi.com
10
74AC245, 74ACT245 — Octal Bidirectional Transceiver with 3-STATE Inputs/Outputs
Physical Dimensions (Continued)
74AC245, 74ACT245 — Octal Bidirectional Transceiver with 3-STATE Inputs/Outputs
Physical Dimensions (Continued)
Figure 5. 20-Lead Shrink Small Outline Package (SSOP), JEDEC MO-150, 5.3mm Wide
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or
obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions,
specifically the warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/
©1988 Fairchild Semiconductor Corporation
74AC245, 74ACT245 Rev. 1.5.0
www.fairchildsemi.com
11
ACEx®
Build it Now™
CorePLUS™
CROSSVOLT™
CTL™
Current Transfer Logic™
EcoSPARK®
EZSWITCH™ *
™
PDP-SPM™
SyncFET™
®
Power220®
®
Power247
The Power Franchise®
POWEREDGE®
Power-SPM™
PowerTrench®
TinyBoost™
Programmable Active Droop™
TinyBuck™
®
QFET
TinyLogic®
QS™
TINYOPTO™
QT Optoelectronics™
TinyPower™
®
Quiet Series™
TinyPWM™
RapidConfigure™
TinyWire™
Fairchild®
SMART START™
Fairchild Semiconductor®
µSerDes™
®
SPM
FACT Quiet Series™
UHC®
STEALTH™
FACT®
Ultra FRFET™
SuperFET™
FAST®
UniFET™
SuperSOT™-3
FastvCore™
VCX™
®
®*
SuperSOT™-6
FlashWriter
SuperSOT™-8
* EZSWITCH™ and FlashWriter® are trademarks of System General Corporation, used under license by Fairchild Semiconductor.
FPS™
FRFET®
Global Power ResourceSM
Green FPS™
Green FPS™ e-Series™
GTO™
i-Lo™
IntelliMAX™
ISOPLANAR™
MegaBuck™
MICROCOUPLER™
MicroFET™
MicroPak™
MillerDrive™
Motion-SPM™
OPTOLOGIC®
OPTOPLANAR®
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS
HEREIN TO IMPROVE RELIABILITY, FUNCTION, OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE
APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS
PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. THESE SPECIFICATIONS DO NOT EXPAND THE TERMS OF FAIRCHILD’S
WORLDWIDE TERMS AND CONDITIONS, SPECIFICALLY THE WARRANTY THEREIN, WHICH COVERS THESE PRODUCTS.
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 FAIRCHILD SEMICONDUCTOR CORPORATION.
As used herein:
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 of the user.
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.
PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet Identification
Product Status
Definition
Advance Information
Formative or In Design
This datasheet contains the design specifications for product
development. Specifications may change in any manner without notice.
Preliminary
First Production
This datasheet contains preliminary data; supplementary data will be
published at a later date. Fairchild Semiconductor reserves the right to
make changes at any time without notice to improve design.
No Identification Needed
Full Production
This datasheet contains final specifications. Fairchild Semiconductor
reserves the right to make changes at any time without notice to improve
the design.
Obsolete
Not In Production
This datasheet contains specifications on a product that has been
discontinued by Fairchild Semiconductor. The datasheet is printed for
reference information only.
Rev. I32
©1988 Fairchild Semiconductor Corporation
74AC245, 74ACT245 Rev. 1.5.0
www.fairchildsemi.com
12
74AC245, 74ACT245 — Octal Bidirectional Transceiver with 3-STATE Inputs/Outputs
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