RD74LVC245B
Octal Bidirectional Transceivers with 3-state Outputs
REJ03D0386–0100
Rev.1.00
Aug. 26, 2004
Description
The RD74LVC245B has eight buffers with three state outputs in a 20 pin package. When (DIR) is high, data flows
from the A inputs to the B outputs, and when (DIR) is low, data flows from the B inputs to the A outputs. A and B bus
are separated by making enable input (OE) high level. Low voltage and high-speed operation is suitable at the battery
drive product (note type personal computer) and low power consumption extends the life of a battery for long time
operation.
Features
V
CC
= 1.65 V to 5.5 V
All inputs V
IH
(Max.) = 5.5 V (@V
CC
= 0 V to 5.5 V)
All input outputs V
I/O
(Max.) = 5.5 V (@V
CC
= 0 V or output off state)
Typical V
OL
ground bounce < 0.8 V (@V
CC
= 3.3 V, Ta = 25°C)
Typical V
OH
undershoot > 2.0 V (@V
CC
= 3.3 V, Ta = 25°C)
High output current ±4 mA (@V
CC
= 1.65 V)
±8 mA (@V
CC
= 2.3 V)
±12 mA (@V
CC
= 2.7 V)
±24 mA (@V
CC
= 3.0 V to 5.5 V)
•
Ordering Information
Part Name
RD74LVC245BFPEL
RD74LVC245BTELL
Package Type
SOP–20 pin (JEITA)
TSSOP–20 pin
Package Code
FP–20DAV
TTP–20DAV
FP
T
Package
Abbreviation
Taping Abbreviation
(Quantity)
EL (2,000 pcs/reel)
ELL (2,000 pcs/reel)
•
•
•
•
•
•
Function Table
Inputs
OE
L
L
H
H: High level
L: Low level
X: Immaterial
Z: High impedance
DIR
L
H
X
Operation
B data to A bus
A data to B bus
Z
Rev.1.00 Aug. 26, 2004 page 1 of 7
RD74LVC245B
Pin Arrangement
DIR 1
A1
A2
2
3
20 V
CC
19
OE
18 B1
17 B2
16 B3
15 B4
14 B5
13 B6
12 B7
11 B8
(Top view)
A3 4
A4 5
A5
A6
A7
A8
6
7
8
9
GND 10
Absolute Maximum Ratings
Item
Supply voltage
Input diode current
Input voltage
Output diode current
Input / output voltage
Output current
V
CC
, GND current / pin
Storage temperature
Symbol
V
CC
I
IK
V
I
I
OK
V
I/O
I
O
I
CC
or I
GND
Tstg
–0.5 to 7.0
–50
–0.5 to 7.0
–50
50
–0.5 to V
CC
+0.5
–0.5 to 7.0
±50
100
–65 to 150
mA
mA
°C
V
Ratings
V
mA
V
mA
V
O
= –0.5 V
V
O
= V
CC
+0.5 V
Output "H" or "L"
Output "Z" or V
CC
:OFF
V
I
= –0.5 V
Unit
Conditions
Note: The absolute maximum ratings are values, which must not individually be exceeded, and furthermore, no two of
which may be realized at the same time.
Rev.1.00 Aug. 26, 2004 page 2 of 7
RD74LVC245B
Recommended Operating Conditions
Item
Supply voltage
Input / output voltage
Symbol
V
CC
V
I
V
O
Ta
I
OH
Ratings
1.5 to 5.5
1.65 to 5.5
0 to 5.5
0 to V
CC
0 to 5.5
–40 to 85
–4
–8
–12
–24
4
8
12
24
20
10
Unit
V
V
Output "H" or "L"
Output "Z" or V
CC
: OFF
°C
mA
V
CC
= 1.65 V
V
CC
= 2.3 V
V
CC
= 2.7 V
V
CC
= 3.0 V to 5.5 V
V
CC
= 1.65 V
V
CC
= 2.3 V
V
CC
= 2.7 V
V
CC
= 3.0 V to 5.5 V
V
CC
= 1.65 V to 2.7 V
V
CC
= 3.0 V to 5.5 V
Conditions
Data hold
At operation
Operating temperature
Output current
I
OL
mA
Input rise / fall time
*1
t
r
, t
f
ns/V
Notes: 1. This item guarantees maximum limit when one input switches.
Waveform: Refer to test circuit of switching characteristics.
Electrical Characteristics
Item
Input voltage
Symbol
V
CC
(V)
V
IH
1.65 to 1.95
2.3 to 2.7
2.7 to 3.6
4.5 to 5.5
1.65 to 1.95
V
IL
2.3 to 2.7
2.7 to 3.6
4.5 to 5.5
V
OH
1.65 to 5.5
1.65
2.3
2.7
3.0
3.0
4.5
V
OL
1.65 to 5.5
1.65
2.3
2.7
3.0
4.5
I
IN
0 to 5.5
I
OFF
0
I
OZ
2.7 to 5.5
I
CC
∆I
CC
2.7 to 3.6
2.7 to 5.5
2.7 to 3.6
Ta = –40 to 85°C
Min
Max
V
CC
×0.65
—
1.7
—
2.0
—
V
CC
×0.7
—
—
V
CC
×0.35
—
0.7
—
0.8
—
V
CC
×0.3
V
CC
–0.2
—
1.2
—
1.7
—
2.2
—
2.4
—
2.2
—
3.8
—
—
0.2
—
0.45
—
0.7
—
0.4
—
0.55
—
0.55
—
±5.0
—
±5.0
—
±5.0
—
—
—
±5.0
5.0
500
Unit
V
Test Conditions
V
Output voltage
V
I
OH
= –100 µA
I
OH
= –4 mA
I
OH
= –8 mA
I
OH
= –12 mA
I
OH
= –24 mA
V
I
OL
= 100 µA
I
OL
= 4 mA
I
OL
= 8 mA
I
OL
= 12 mA
I
OL
= 24 mA
V
IN
= 5.5 V or GND
V
IN
/ V
OUT
= 5.5 V
V
IN
= V
CC
, GND,
V
OUT
= 5.5 V or GND
V
IN
= 3.6 to 5.5 V
V
IN
= V
CC
or GND
V
IN
= one input at (V
CC
–0.6)V,
other inputs at V
CC
or GND
Input current
Output leak current
Off state output
current
Quiescent supply
current
µA
µA
µA
µA
µA
Rev.1.00 Aug. 26, 2004 page 3 of 7
RD74LVC245B
Switching Characteristics
Ta = –40 to 85°C
Item
Propagation delay time
Symbol
t
PLH
t
PHL
V
CC
(V)
1.8±0.15
2.5±0.2
2.7
3.3±0.3
5.0±0.5
Output enable time
t
ZH
t
ZL
1.8±0.15
2.5±0.2
2.7
3.3±0.3
5.0±0.5
Output disable time
t
ZH
t
LZ
1.8±0.15
2.5±0.2
2.7
3.3±0.3
5.0±0.5
Between output pins skew t
OSLH
*1
t
OSHL
1.8±0.15
2.5±0.2
2.7
3.3±0.3
5.0±0.5
Input capacitance
Output capacitance
Note:
C
IN
C
O
3.3
3.3
Min
1.0
1.0
1.0
1.5
1.0
1.0
1.0
1.0
1.5
1.0
1.0
1.0
1.0
1.7
1.0
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
4.0
8.0
Typ
Max
12.7
8.3
7.3
6.3
4.8
15.3
10.5
9.5
8.5
7.0
17.0
9.5
8.5
7.5
6.5
—
—
—
1.0
1.0
—
—
pF
pF
ns
ns
OE
A or B
ns
OE
A or B
ns
Unit
From
(Input)
A or B
To
(Output)
B or A
1. This parameter is characterized but not tested.
tos
LH
= | t
PLHm
- t
PLHn
|, tos
HL
= | t
PHLm
- t
PHLn
|
Operating Characteristics
Ta = 25°C
Item
Power dissipation
capacitance
Symbol
C
PD
V
CC
(V)
1.8
2.5
3.3
5.0
Min
Typ
42
43
45
47
Max
pF
Unit
Test Conditions
f = 10 MHz
Rev.1.00 Aug. 26, 2004 page 4 of 7
RD74LVC245B
Test Circuit
V
CC
V
CC
OE
See Function Table
Input
Pulse
Generator
Z
out
= 50
Ω
Output
A1
B1
C
L
DIR
R
L
S1
R
L
S2
OPEN
V
TT
GND
Symbol
t
PLH
/ t
PHL
t
ZH
/ t
HZ
t
ZL
/ t
LZ
S2
OPEN
GND
V
TT
Note:
1. C
L
includes probe and jig capacitance.
Waveforms – 1
t
r
90 %
Input
V
ref
10 %
t
PLH
V
ref
90 %
V
ref
10 %
t
PHL
V
OH
In phase output
V
ref
V
OL
t
f
V
IH
GND
Rev.1.00 Aug. 26, 2004 page 5 of 7
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