HD74AC245/HD74ACT245
Octal Bi-directional Transceiver with 3-State Input/Output
REJ03D0263–0200Z
(Previous ADE-205-384 (Z))
Rev.2.00
Jul.16.2004
Description
The HD74AC245/HD74ACT245 contains eight non-inverting bidirectional buffers with 3-state outputs and is intended
for bus-oriented 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 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.
Features
•
Noninverting Buffers
•
Bi-directional Data Path
•
A and B Outputs Source/Sink 24 mA
•
HD74ACT245 has TTL-Compatible Inputs
•
Ordering Information: Ex. HD74AC245
Part Name
HD74AC245P
HD74AC245FPEL
HD74AC245RPEL
HD74AC245TELL
Package Type
DIP-20 pin
SOP-20 pin (JEITA)
TSSOP-20 pin
Package Code Package Abbreviation Taping Abbreviation (Quantity)
DP-20N, -20NEV P
FP-20DAV
TTP-20DAV
FP
RP
T
—
EL (2,000 pcs/reel)
EL (1,000 pcs/reel)
ELL (2,000 pcs/reel)
SOP-20 pin (JEDEC) FP-20DBV
Notes: 1. Please consult the sales office for the above package availability.
2. The packages with lead-free pins are distinguished from the conventional products by adding V at the end of
the package code.
Rev.2.00, Jul.16.2004, page 1 of 8
HD74AC245/HD74ACT245
Pin Names
OE
T/R
A
0
to A
7
B
0
to B
7
Output Enable Input
Transmit/Receive Input
Side A 3-State Inputs or 3-State Outputs
Side B 3-State Inputs or 3-State Outputs
Pin Arrangement
T/R 1
A
0
2
A
1
3
A
2
4
A
3
5
A
4
6
A
5
7
A
6
8
A
7
9
GND 10
(Top view)
20 V
CC
19
OE
18 B
0
17 B
1
16 B
2
15 B
3
14 B
4
13 B
5
12 B
6
11 B
7
Truth Tables
Inputs
OE
L
L
H
H :
L :
X :
High Voltage Level
Low Voltage Level
Immaterial
L
H
X
T/R
R
Bus B Data to Bus A
Bus A Data to Bus B
High Z State
Outputs
Absolute Maximum Ratings
Item
Supply voltage
DC input diode current
DC input voltage
DC output diode current
DC output voltage
DC output source or sink current
DC V
CC
or ground current per output pin
Storage temperature
Symbol
V
CC
I
IK
V
I
I
OK
V
O
I
O
I
CC
, I
GND
Tstg
Ratings
–0.5 to 7
–20
20
–0.5 to Vcc+0.5
–50
50
–0.5 to Vcc+0.5
±50
±50
–65 to +150
Unit
V
mA
mA
V
mA
mA
V
mA
mA
°C
Condition
V
I
= –0.5V
V
I
= Vcc+0.5V
V
O
= –0.5V
V
O
= Vcc+0.5V
Rev.2.00, Jul.16.2004, page 2 of 8
HD74AC245/HD74ACT245
Recommended Operating Conditions: HD74AC245
Item
Supply voltage
Input and Output voltage
Operating temperature
Input rise and fall time
(except Schmitt inputs)
V
IN
30% to 70% V
CC
Symbol
V
CC
V
I
, V
O
Ta
tr, tf
Ratings
2 to 6
0 to V
CC
–40 to +85
8
V
V
°C
ns/V
V
CC
= 3.0V
V
CC
= 4.5 V
V
CC
= 5.5 V
Unit
Condition
DC Characteristics: HD74AC245
Item
Sym-
bol
V
IH
Vcc
(V)
3.0
4.5
5.5
V
IL
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
V
OL
5.5
3.0
4.5
5.5
3.0
4.5
Input leakage
current
3 State current
I
IN
I
OZ
5.5
5.5
5.5
min.
2.1
3.15
3.85
—
—
—
2.9
4.4
5.4
2.58
3.94
4.94
—
—
—
—
—
—
—
—
Ta = 25°C
°
typ.
1.5
2.25
2.75
1.50
2.25
2.75
2.99
4.49
5.49
—
—
—
0.002
0.001
0.001
—
—
—
—
—
max.
—
—
—
0.9
1.35
1.65
—
—
—
—
—
—
0.1
0.1
0.1
0.32
0.32
0.32
±0.1
±0.5
Ta = –40 to
+85°C
°
min.
2.1
3.15
3.85
—
—
—
2.9
4.4
5.4
2.48
3.80
4.80
—
—
—
—
—
—
—
—
max.
—
—
—
0.9
1.35
1.65
—
—
—
—
—
—
0.1
0.1
0.1
0.37
0.37
0.37
±1.0
±5.0
µA
µA
V
V
OUT
= 0.1 V or V
CC
–0.1 V
Unit
Condition
Input Voltage
V
V
OUT
= 0.1 V or V
CC
–0.1 V
Output voltage
V
OH
V
IN
= V
IL
or V
IH
I
OUT
= –50
µA
V
IN
= V
IL
or V
IH
I
OH
= –12 mA
I
OH
= –24 mA
I
OH
= –24 mA
V
IN
= V
IL
or V
IH
I
OUT
= 50
µA
V
IN
= V
IL
or V
IH
I
OL
= 12 mA
I
OL
= 24 mA
I
OL
= 24 mA
V
IN
= V
CC
or GND
V
IN(OE)
= V
IL
, V
IH
V
IN
= V
CC
or GND
V
OUT
= V
CC
or GND
V
OLD
= 1.1 V
V
OHD
= 3.85 V
V
IN
= V
CC
or ground
Dynamic output
current*
Quiescent supply
current
I
OLD
I
OHD
I
CC
5.5
5.5
5.5
—
—
—
—
—
—
—
—
8.0
86
–75
—
—
—
80
mA
mA
µA
*Maximum
test duration 2.0 ms, one output loaded at a time.
Recommended Operating Conditions: HD74ACT245
Item
Supply voltage
Input and output voltage
Operating temperature
Input rise and fall time
(except Schmitt inputs)
V
IN
0.8 to 2.0 V
Symbol
V
CC
V
I
, V
O
Ta
tr, tf
Ratings
2 to 6
0 to V
CC
–40 to +85
8
V
V
°C
ns/V
V
CC
= 4.5V
V
CC
= 5.5V
Unit
Condition
Rev.2.00, Jul.16.2004, page 3 of 8
HD74AC245/HD74ACT245
DC Characteristics: HD74ACT245
Item
Sym-
bol
V
IH
V
IL
Output voltage
V
OH
V
CC
(V)
4.5
5.5
4.5
5.5
4.5
5.5
4.5
V
OL
5.5
4.5
5.5
4.5
Input current
3 State current
I
CC
/input current
Dynamic output
current*
Quiescent supply
current
I
IN
I
OZ
I
CCT
I
OLD
I
OHD
I
CC
5.5
5.5
5.5
5.5
5.5
5.5
5.5
min.
2.0
2.0
—
—
4.4
5.4
3.94
4.94
—
—
—
—
—
—
—
—
—
—
Ta = 25°C
°
typ.
1.5
1.5
1.5
1.5
4.49
5.49
—
—
0.001
0.001
—
—
—
—
0.6
—
—
—
max.
—
—
0.8
0.8
—
—
—
—
0.1
0.1
0.32
0.32
±0.1
±0.5
—
—
—
8.0
Ta = –40 to
+85°C
°
min.
2.0
2.0
—
—
4.4
5.4
3.80
4.80
—
—
—
—
—
—
—
86
–75
—
max.
—
—
0.8
0.8
—
—
—
—
0.1
0.1
0.37
0.37
±1.0
±5.0
1.5
—
—
80
µA
µA
mA
mA
mA
µA
V
Unit
Condition
Input voltage
V
V
OUT
= 0.1 V or V
CC
–0.1 V
V
OUT
= 0.1 V or V
CC
–0.1 V
V
IN
= V
IL
or V
IH
I
OUT
= –50
µA
V
IN
= V
IL
V
IN
= V
IL
or V
IH
I
OUT
= 50
µA
V
IN
= V
IL
V
IN
= V
CC
or GND
V
IN
= V
IL
, V
IH
V
OUT
= V
CC
or GND
V
IN
= V
CC
–2.1 V
V
OLD
= 1.1 V
V
OHD
= 3.85 V
V
IN
= V
CC
or ground
I
OL
= 24 mA
I
OL
= 24 mA
I
OH
= –24 mA
I
OH
= –24 mA
*Maximum
test duration 2.0 ms, one output loaded at a time.
AC Characteristics: HD74AC245
Ta = +25°C
C
L
= 50 pF
Min
Typ
Max
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
5.0
3.5
5.0
3.5
7.0
5.0
7.5
5.5
6.5
5.5
7.0
5.5
8.5
6.5
8.5
6.0
11.5
8.5
12.0
9.0
12.0
9.0
11.5
9.0
Ta = –40°C to +85°C
C
L
= 50 pF
Min
Max
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
9.0
7.0
9.0
7.0
12.5
9.0
13.5
9.5
12.5
10.0
13.0
10.0
ns
ns
ns
ns
ns
ns
Item
Propagation delay
Data to output
Propagation delay
Data to output
Output enable time
Output enable time
Output disable time
Output disable time
Note:
Symbol
t
PLH
t
PHL
t
ZH
t
ZL
t
HZ
t
LZ
V
CC
(V)*
1
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
Unit
1. Voltage Range 3.3 is 3.3 V ± 0.3 V
Voltage Range 5.0 is 5.0 V ± 0.5 V
Rev.2.00, Jul.16.2004, page 4 of 8
HD74AC245/HD74ACT245
AC Characteristics: HD74ACT245
Ta = +25°C
C
L
= 50 pF
Item
Propagation delay
Data to output
Propagation delay
Data to output
Output enable time
Output enable time
Output disable time
Output disable time
Note:
Symbol
t
PLH
t
PHL
t
ZH
t
ZL
t
HZ
t
LZ
V
CC
(V)*
1
Min
5.0
1.0
5.0
5.0
5.0
5.0
5.0
1.0
1.0
1.0
1.0
1.0
Typ
4.0
4.0
5.0
5.5
5.5
5.0
Max
7.5
8.0
10.0
10.0
10.0
10.0
Ta = –40°C to +85°C
C
L
= 50 pF
Min
1.0
1.0
1.0
1.0
1.0
1.0
8.0
9.0
11.0
12.0
11.0
11.0
Max
ns
ns
ns
ns
ns
ns
Unit
1. Voltage Range 5.0 is 5.0 V ± 0.5 V
Capacitance
Item
Input capacitance
Input/output capacitance
Power dissipation capacitance
Symbol
C
IN
C
I/O
C
PD
4.5
15.0
45.0
Typ
pF
pF
pF
Unit
V
CC
= 5.5 V
V
CC
= 5.5 V
V
CC
= 5.0 V
Condition
Rev.2.00, Jul.16.2004, page 5 of 8
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