74AC245, 74ACT245 — Octal Bidirectional Transceiver with 3-STATE Inputs/Outputs
January 2008
74AC245, 74ACT245
Octal Bidirectional Transceiver with 3-STATE
Inputs/Outputs
Features
■
I
CC
and I
OZ
reduced by 50%
■
Non-inverting buffers
■
Bidirectional data path
■
A and B outputs source/sink 24mA
■
ACT245 has TTL-compatible inputs
General Description
The AC/ACT245 contains eight non-inverting bidirec-
tional 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 (active-
LOW) 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.
Ordering Information
Order Number
74AC245SC
74AC245SJ
74AC245MTC
74AC245PC
74ACT245SC
74ACT245SJ
74ACT245MSA
74ACT245MTC
74ACT245PC
Package
Number
M20B
M20D
MTC20
N20A
M20B
M20D
MSA20
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
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 Shrink Small Outline Package (SSOP), JEDEC MO-150, 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
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
Connection Diagram
Logic Symbol
IEEE/IEC
Pin Description
Pin
Names
OE
T/R
A
0
–A
7
B
0
–B
7
Description
Output Enable Input
Transmit/Receive Input
Side A 3-STATE Inputs or 3-STATE
Outputs
Side B 3-STATE Inputs or 3-STATE
Outputs
Truth Table
Inputs
OE
L
L
H
T/R
L
H
X
Outputs
Bus B Data to Bus A
Bus A Data to Bus B
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
Absolute Maximum Ratings
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
V
CC
I
IK
Supply Voltage
DC Input Diode Current
V
I
= −
0.5V
V
I
=
V
CC
+
0.5
V
I
I
OK
DC Input Voltage
DC Output Diode Current
V
O
= −
0.5V
V
O
=
V
CC
+
0.5V
V
O
I
O
DC Output Voltage
Parameter
Rating
−
0.5V to
+
7.0V
−
20mA
+
20mA
−
0.5V to V
CC
+
0.5V
−
20mA
+
20mA
−
0.5V to V
CC
+
0.5V
±
50mA
±
50mA
−
65
°
C to
+
150
°
C
140
°
C
DC Output Source or Sink Current
I
CC
or I
GND
DC V
CC
or Ground Current per Output Pin
T
STG
Storage Temperature
T
J
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
V
CC
Supply Voltage
AC
ACT
V
I
V
O
T
A
∆
V /
∆
t
∆
V /
∆
t
Input Voltage
Output Voltage
Operating Temperature
Parameter
Rating
2.0V to 6.0V
4.5V to 5.5V
0V to V
CC
0V to V
CC
−
40
°
C to
+
85
°
C
125mV/ns
125mV/ns
Minimum Input Edge Rate, AC Devices:
V
IN
from 30% to 70% of V
CC
, V
CC
@ 3.3V, 4.5V, 5.5V
Minimum Input Edge Rate, ACT Devices:
V
IN
from 0.8V to 2.0V, V
CC
@ 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
DC Electrical Characteristics for AC
T
A
= +
25
°
C
Symbol
V
IH
T
A
= −
40
°
C to
+
85
°
C
Units
V
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
2.46
3.76
4.76
0.1
0.1
0.1
0.44
0.44
0.44
±1.0
75
−75
µA
mA
mA
µA
µA
V
V
V
Parameter
Minimum HIGH Level
Input Voltage
V
CC
(V)
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
Conditions
V
OUT
=
0.1V or
V
CC
– 0.1V
V
OUT
=
0.1V or
V
CC
– 0.1V
I
OUT
=
–50µA
Typ.
1.5
2.25
2.75
1.5
2.25
2.75
2.99
4.49
5.49
2.1
Guaranteed Limits
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
2.56
3.86
4.86
V
IL
Maximum LOW Level
Input Voltage
V
OH
Minimum HIGH Level
Output Voltage
V
IN
=
V
IL
or V
IH
,
I
OH
=
–12mA
V
IN
=
V
IL
or V
IH
,
I
OH
=
–24mA
V
IN
=
V
IL
or V
IH
,
I
OH
=
–24mA
(1)
0.002
0.001
0.001
V
IN
=
V
IL
or V
IH
,
I
OL
=
12mA
V
IN
=
V
IL
or V
IH
,
I
OL
=
24mA
V
IN
=
V
IL
or V
IH
,
I
OL
=
24mA
(1)
V
I
=
V
CC
, GND
V
OLD
=
1.65V Max.
V
OHD
=
3.85V Min.
V
IN
=
V
CC
or GND
V
I
(OE)
=
V
IL
, V
IH
;
V
I
=
V
CC
, GND;
V
O
=
V
CC
, GND
I
OUT
=
50µA
V
OL
Maximum LOW Level
Output Voltage
3.0
4.5
5.5
3.0
4.5
5.5
0.1
0.1
0.1
0.36
0.36
0.36
±0.1
I
IN(2)
I
OLD
I
OHD
I
CC(2)
I
OZT
Maximum Input
Leakage Current
Minimum Dynamic
Output Current
(3)
Maximum Quiescent
Supply Current
Maximum I/O
Leakage Current
5.5
5.5
5.5
5.5
5.5
4.0
±0.3
40.0
±3.0
Notes:
1. All outputs loaded; thresholds on input associated with output under test.
2. I
IN
and I
CC
@ 3.0V are guaranteed to be less than or equal to the respective limit @ 5.5V V
CC
.
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 ACT
T
A
= +25°C
Symbol
V
IH
V
IL
V
OH
T
A
= −40°C
to
+85°C
Units
V
V
V
2.0
2.0
0.8
0.8
4.4
5.4
3.76
4.76
0.1
0.1
0.44
0.44
±1.0
1.5
75
−75
µA
mA
mA
mA
µA
µA
V
Parameter
Minimum HIGH Level
Input Voltage
Maximum LOW
Level Input Voltage
Minimum HIGH Level
Output Voltage
V
CC
(V)
4.5
5.5
4.5
5.5
4.5
5.5
4.5
5.5
Conditions
V
OUT
=
0.1V or
V
CC
−
0.1V
V
OUT
=
0.1V or
V
CC
−
0.1V
I
OUT
= −50µA
V
IN
=
V
IL
or V
IH
,
I
OH
= −24mA
V
IN
=
V
IL
or V
IH
,
I
OH
= −24mA
(4)
I
OUT
=
50µA
V
IN
=
V
IL
or V
IH
,
I
OL
=
24mA
V
IN
=
V
IL
or V
IH
,
I
OL
=
24mA
(4)
V
I
=
V
CC
, GND
V
I
=
V
CC
−
2.1V
V
OLD
=
1.65V Max.
V
OHD
=
3.85V Min.
V
IN
=
V
CC
or GND
V
I
(OE)
=
V
IL
, V
IH
;
V
I
=
V
CC
, GND;
V
O
=
V
CC
, GND
Typ.
1.5
1.5
1.5
1.5
4.49
5.49
2.0
2.0
0.8
0.8
4.4
5.4
Guaranteed Limits
3.86
4.86
0.001
0.001
0.1
0.1
0.36
0.36
±0.1
0.6
V
OL
Maximum LOW
Level Output Voltage
4.5
5.5
4.5
5.5
I
IN
I
CCT
I
OLD
I
OHD
I
CC
I
OZT
Maximum Input
Leakage Current
Maximum I
CC
/Input
Minimum Dynamic
Output Current
(5)
Maximum Quiescent
Supply Current
Maximum I/O
Leakage Current
5.5
5.5
5.5
5.5
5.5
5.5
4.0
±0.3
40.0
±3.0
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
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