74AC245 • 74ACT245 Octal Bidirectional Transceiver with 3-STATE
November 1988
Revised March 2005
74AC245 • 74ACT245
Octal Bidirectional Transceiver with 3-STATE
Inputs/Outputs
General Description
The AC/ACT245 contains eight non-inverting bidirectional
buffers with 3-STATE outputs and is intended for bus-ori-
ented applications. Current sinking capability is 24 mA at
both the A and B ports. The Transmit/Receive (T/R) input
determines the direction of data flow through the bidirec-
tional 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.
Features
s
I
CC
and I
OZ
reduced by 50%
s
Non-inverting buffers
s
Bidirectional data path
s
A and B outputs source/sink 24 mA
s
ACT245 has TTL-compatible inputs
Ordering Code:
Order Number
74AC245SC
74AC245SJ
74AC245MTC
74AC245PC
74ACT245SC
74ACT245SCX_NL
(Note 1)
74ACT245SJ
74ACT245MSA
74ACT245MTC
74ACT245MTCX_NL
(Note 1)
74ACT245PC
Package
Number
M20B
M20D
MTC20
N20A
M20B
M20B
M20D
MSA20
MTC20
MTC20
N20A
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
Pb-Free 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
Pb-Free 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
Pb-Free 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
Pb-Free 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 code.
Pb-Free package per JEDEC J-STD-020B.
Note 1:
“_NL” indicates Pb-Free package (per JEDEC J-STD-020B). Device available in Tape and Reel only.
FACT
¥
is a trademark of Fairchild Semiconductor Corporation.
© 2005 Fairchild Semiconductor Corporation
DS009944
www.fairchildsemi.com
74AC245 • 74ACT245
Absolute Maximum Ratings
(Note 2)
Supply Voltage (V
CC
)
DC Input Diode Current (I
IK
)
V
I
V
I
0.5V to
7.0V
20 mA
20 mA
0.5V to V
CC
0.5V
20 mA
20 mA
0.5V to V
CC
0.5V
r
50 mA
r
50 mA
65
q
C to
150
q
C
140
q
C
Recommended Operating
Conditions
Supply Voltage (V
CC
)
AC
ACT
Input Voltage (V
I
)
Output Voltage (V
O
)
Operating Temperature (T
A
)
Minimum Input Edge Rate (
'
V/
'
t)
AC Devices
V
IN
from 30% to 70% of V
CC
V
CC
@ 3.3V, 4.5V, 5.5V
Minimum Input Edge Rate (
'
V/
'
t)
ACT Devices
V
IN
from 0.8V to 2.0V
V
CC
@ 4.5V, 5.5V
125 mV/ns
Note 2:
Absolute maximum ratings are those values beyond which damage
to the device may occur. The databook specifications should be met, with-
out exception, to ensure that the system design is reliable over its power
supply, temperature, and output/input loading variables. Fairchild does not
recommend operation of FACT
¥
circuits outside databook specifications.
0.5V
V
CC
0.5V
2.0V to 6.0V
4.5V to 5.5V
0V to V
CC
0V to V
CC
DC Input Voltage (V
I
)
DC Output Diode Current (I
OK
)
V
O
V
O
0.5V
V
CC
0.5V
40
q
C to
85
q
C
DC Output Voltage (V
O
)
DC Output Source
or Sink Current (I
O
)
DC V
CC
or Ground Current
per Output Pin (I
CC
or I
GND
)
Storage Temperature (T
STG
)
Junction Temperature (T
J
)
PDIP
125 mV/ns
DC Electrical Characteristics for AC
Symbol
V
IH
Parameter
Minimum HIGH Level
Input Voltage
V
IL
Maximum LOW Level
Input Voltage
V
OH
Minimum HIGH Level
Output 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
V
OL
Maximum LOW Level
Output Voltage
3.0
4.5
5.5
3.0
4.5
5.5
I
IN (Note 5)
I
OLD
I
OHD
I
OZT
Maximum Input Leakage Current
Dynamic Output
Current Minimum (Note 4)
Maximum I/O
Leakage Current
5.5
5.5
5.5
5.5
5.5
4.0
0.002
0.001
0.001
T
A
Typ
1.5
2.25
2.75
1.5
2.25
2.75
2.99
4.49
5.49
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
2.56
3.86
4.86
0.1
0.1
0.1
0.36
0.36
0.36
25
q
C
T
A
40
q
C to
85
q
C
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
Guaranteed Limits
Units
V
OUT
V
Conditions
0.1V
or V
CC
0.1V
V
OUT
0.1V
V
or V
CC
0.1V
V
I
OUT
V
IN
50
P
A
V
IL
or V
IH
2.46
3.76
4.76
0.1
0.1
0.1
V
V
I
OH
I
OH
I
OH
I
OUT
V
IN
12 mA
24 mA
24 mA (Note 3)
50
P
A
V
IL
or V
IH
12 mA
24 mA
24 mA (Note 3)
V
CC
, GND
1.65V Max
3.85V Min
V
CC
or GND
V
IL
, V
IH
V
CC
, GND
V
CC
, GND
0.44
0.44
0.44
V
I
OL
I
OL
I
OL
V
I
r
0.1
r
1.0
75
P
A
mA
mA
V
OLD
V
OHD
V
IN
V
I
V
O
V
I
(OE)
75
40.0
I
CC
(Note 5) Maximum Quiescent Supply Current
P
A
P
A
r
0.3
r
3.0
Note 3:
All outputs loaded; thresholds on input associated with output under test.
Note 4:
Maximum test duration 2.0 ms, one output loaded at a time.
Note 5:
I
IN
and I
CC
@ 3.0V are guaranteed to be less than or equal to the respective limit @ 5.5V V
CC
.
3
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