HD74LVC245A
Octal Bidirectional Transceivers with 3-state Outputs
REJ03D0353–0400Z
(Previous ADE-205-111B (Z))
Rev.4.00
Jul. 27, 2004
Description
The HD74LVC245A has eight buffers with three state outputs in a 20 pin package. When (T /
R)
is high, data flows
from the A inputs to the B outputs, and when (T /
R)
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
= 2.0 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 ±24 mA (@V
CC
= 3.0 V to 5.5 V)
Ordering Information
Package Type
SOP–20 pin (JEITA)
TSSOP–20 pin
Package Code
FP–20DAV
TTP–20DAV
Package
Abbreviation
FP
T
Taping Abbreviation
(Quantity)
EL (2,000 pcs/reel)
ELL (2,000 pcs/reel)
Part Name
HD74LVC245AFPEL
HD74LVC245ATELL
Note: Please consult the sales office for the above package availability.
Function Table
Inputs
OE
L
L
H
H:
L:
X:
Z:
High level
Low level
Immaterial
High impedance
T/
R
L
H
X
Operation
B data to A bus
A data to B bus
Z
Rev.4.00 Jul. 27, 2004 page 1 of 6
HD74LVC245A
Pin Arrangement
T/R 1
A0 2
A1 3
A2 4
A3 5
A4 6
A5 7
A6 8
A7 9
GND 10
20 V
CC
19 OE
18 B0
17 B1
16 B2
15 B3
14 B4
13 B5
12 B6
11 B7
(Top view)
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
Ratings
–0.5 to 6.0
–50
–0.5 to 6.0
–50
50
–0.5 to V
CC
+0.5
–0.5 to 6.0
±50
100
–65 to 150
Unit
V
mA
V
mA
V
mA
mA
°C
Conditions
V
I
= –0.5 V
T /
R, OE
V
O
= –0.5 V
V
O
= V
CC
+0.5 V
Output "H" or "L"
Output "Z" or V
CC
:OFF
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.4.00 Jul. 27, 2004 page 2 of 6
HD74LVC245A
Recommended Operating Conditions
Item
Supply voltage
Input / output voltage
Symbol
V
CC
V
I
V
I/O
Ta
I
OH
I
OL
Input rise / fall time
*1
t
r
, t
f
Ratings
1.5 to 5.5
2.0 to 5.5
0 to 5.5
0 to V
CC
0 to 5.5
–40 to 85
–12
–24
*2
12
24
*2
10
Unit
V
V
V
°C
mA
mA
ns/V
Conditions
Data retention
At operation
T /
R, OE
Output "H" or "L"
Output "Z" or V
CC
:OFF
V
CC
= 2.7 V
V
CC
= 3.0 V to 5.5 V
V
CC
= 2.7 V
V
CC
= 3.0 V to 5.5 V
Operating temperature
Output current
Notes: 1. This item guarantees maximum limit when one input switches.
Waveform: Refer to test circuit of switching characteristics.
2. Duty cycle
≤
50%
Electrical Characteristics
Ta = –40 to 85°C
Item
Input voltage
Symbol
V
IH
V
IL
Output voltage
V
OH
V
CC
(V)
2.7 to 3.6
4.5 to 5.5
2.7 to 3.6
4.5 to 5.5
2.7 to 5.5
2.7
3.0
3.0
4.5
2.7 to 5.5
2.7
3.0
4.5
0 to 5.5
2.7 to 5.5
0
2.7 to 3.6
2.7 to 5.5
3.0 to 3.6
Min
2.0
V
CC
×0.7
—
—
V
CC
–0.2
2.2
2.4
2.2
3.8
—
—
—
—
—
—
—
—
—
—
Max
—
—
0.8
V
CC
×0.3
—
—
—
—
—
0.2
0.4
0.55
0.55
±5.0
±5.0
20
±10
10
500
Unit
V
V
V
I
OH
= –100 µA
I
OH
= –12 mA
I
OH
= –24 mA
V
I
OL
= 100 µA
I
OL
= 12 mA
I
OL
= 24 mA
V
IN
= 5.5 V or GND
V
IN
= V
CC
, GND,
V
OUT
= 5.5 V or GND
V
IN
/ V
OUT
= 5.5 V
V
IN
/ V
OUT
= 3.6 to 5.5 V
V
IN
= V
OUT
or GND
V
IN
= one input at (V
CC
–0.6)V,
other inputs at V
CC
or GND
Test Conditions
V
OL
Input current
Off state output current
Output leak current
Quiescent supply current
I
IN
I
OZ
I
OFF
I
CC
∆I
CC
µA
µA
µA
µA
µA
Rev.4.00 Jul. 27, 2004 page 3 of 6
HD74LVC245A
Switching Characteristics
V
CC
(V)
Item
Propagation delay time
Symbol
t
PLH
t
PHL
t
ZH
t
ZL
t
ZH
t
LZ
2.7
3.3±0.3
5.0±0.5
2.7
3.3±0.3
5.0±0.5
2.7
3.3±0.3
5.0±0.5
2.7
3.3±0.3
5.0±0.5
2.7
2.7
Ta = –40 to 85°C
Min
—
1.5
—
—
1.5
—
—
1.5
—
—
—
—
—
—
Typ
—
—
—
—
—
—
—
—
—
—
—
—
3.0
15.0
Max
8.0
7.0
5.5
9.5
8.5
7.0
8.5
7.5
6.5
—
1.0
1.0
—
—
Unit
ns
From
(Input)
A or B
To
(Output)
B or A
Output enable time
ns
OE
A or B
Output disable time
ns
OE
A or B
Between output pins skew t
OSLH
*1
t
OSHL
Input capacitance
Output capacitance
Note:
C
IN
C
O
ns
pF
pF
1. This parameter is characterized but not tested.
tos
LH
= | t
PLHm
- t
PLHn
|, tos
HL
= | t
PHLm
- t
PHLn
|
Test Circuit
V
CC
V
CC
OE
See Function Table
Input
Pulse
Generator
Z
out
= 50
Ω
Output
A0
B0
C
L
=
50 pF
T/R
S2
Vcc=2.7V,
3.3±0.3V
Vcc=5.0±0.5V
S1
500
Ω
450
Ω
50
Ω
Scope
S2
OPEN
*1
See
under table
GND
Symbol
t
PLH
/ t
PHL
t
ZH
/ t
HZ
t
ZL
/ t
LZ
OPEN
GND
6V
OPEN
GND
2×Vcc
Note:
1. C
L
includes probe and jig capacitance.
Rev.4.00 Jul. 27, 2004 page 4 of 6
HD74LVC245A
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
Waveforms – 2
t
f
OE
90 %
V
ref
10 %
t
ZL
Waveform - A
t
ZH
Waveform - B
V
ref
V
ref
t
HZ
V
OH
– 0.3 V
t
r
90 %
V
ref
10 %
t
LZ
V
IH
GND
≈V
OH1
V
OL
+ 0.3 V
V
OL
V
OH
≈V
OL1
TEST
V
IH
V
ref
V
OH1
V
OL1
Vcc=2.7V,
3.3±0.3V
Vcc=5.0±0.5V
2.7 V
1.5 V
3V
GND
Vcc
50%Vcc
Vcc
GND
Notes:
1. t
r
= 2.5 ns, t
f
= 2.5 ns
2. Input waveform : PRR = 10 MHz, duty cycle 50%
3. Waveform – A shows input conditions such that the output is "L" level when enable by the
output control.
4. Waveform – B shows input conditions such that the output is "H" level when enable by the
output control.
Rev.4.00 Jul. 27, 2004 page 5 of 6
京公网安备 11010802033920号
EEWORLD
