HD74LVC245A PDF даташит
Спецификация HD74LVC245A изготовлена «Hitachi Semiconductor» и имеет функцию, называемую «Octal Bidirectional Transceivers». |
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Детали детали
Номер произв | HD74LVC245A |
Описание | Octal Bidirectional Transceivers |
Производители | Hitachi Semiconductor |
логотип |
9 Pages
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HD74LVC245A
Octal Bidirectional Transceivers with 3-state Outputs
ADE-205-111B(Z)
3rd Edition
December 1996
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
• VCC = 2.0 V to 5.5 V
• All inputs VIH (Max.) = 5.5 V (@VCC = 0 V to 5.5 V)
• All input outputs VI/O (Max.) = 5.5 V (@VCC = 0 V or output off state)
• Typical VOL ground bounce < 0.8 V (@VCC = 3.3 V, Ta = 25°C)
• Typical VOH undershoot > 2.0 V (@VCC = 3.3 V, Ta = 25°C)
• High output current ±24 mA (@VCC = 3.0 V to 5.5 V)
Function Table
Inputs
OE T / R
LL
LH
HX
H : High level
L : Low level
X : Immaterial
Z : High impedance
Operation
B data to A bus
A data to B bus
Z
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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 VCC
19 OE
18 B0
17 B1
16 B2
15 B3
14 B4
13 B5
12 B6
11 B7
(Top view)
Absolute Maximum Ratings
Item
Symbol
Ratings
Unit Conditions
Supply voltage
Input diode current
Input voltage
Output diode current
VCC
I IK
VI
I OK
Input / output voltage
VI/O
Output current
VCC, GND current / pin
Storage temperature
IO
ICC or IGND
Tstg
–0.5 to 6.0
–50
–0.5 to 6.0
–50
50
–0.5 to VCC +0.5
–0.5 to 6.0
±50
100
–65 to 150
V
mA
V
mA
mA
V
V
mA
mA
°C
VI = –0.5 V
T / R, OE
VO = –0.5 V
VO = VCC +0.5 V
Output "H" or "L"
Output "Z" or VCC: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.
2
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HD74LVC245A
Recommended Operating Conditions
Item
Symbol
Ratings
Unit
Supply voltage
VCC 1.5 to 5.5
2.0 to 5.5
V
V
Input / output voltage
VI
VI/O
0 to 5.5
0 to VCC
0 to 5.5
V
V
V
Operating temperature Ta
–40 to 85
°C
Output current
IOH –12
–24*2
mA
mA
IOL 12
24*2
mA
mA
Input rise / fall time *1
tr, tf
10
ns/V
Notes: 1. This item guarantees maximum limit when one input switches.
Waveform : Refer to test circuit of switching characteristics.
2. duty cycle ≤ 50%
Conditions
Data retention
At operation
T / R, OE
Output "H" or "L"
Output "Z" or VCC:OFF
VCC = 2.7 V
VCC = 3.0 V to 5.5 V
VCC = 2.7 V
VCC = 3.0 V to 5.5 V
3
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