|
|
HD74LVC245AのメーカーはHitachi Semiconductorです、この部品の機能は「Octal Bidirectional Transceivers」です。 |
部品番号 | HD74LVC245A |
| |
部品説明 | Octal Bidirectional Transceivers | ||
メーカ | Hitachi Semiconductor | ||
ロゴ | |||
このページの下部にプレビューとHD74LVC245Aダウンロード(pdfファイル)リンクがあります。 Total 9 pages
www.DataSheet4U.com
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
1 Page 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
3Pages HD74LVC245A
Test Circuit
VCC
VCC
Input
Pulse
Generator
Zout = 50 Ω
OE
T/R
S1
A0
B0
Output
500 Ω S2
CL = 450 Ω
50 pF 50 Ω Scope
OPEN
*1 See
under table
GND
Note:
1. CL includes probe and jig capacitance.
Waveforms – 1
Symbol
tPLH / t PHL
tZH/ t HZ
tZL / t LZ
S2
Vcc=2.7V,
3.3±0.3V
Vcc=5.0±0.5V
OPEN OPEN
GND
GND
6 V 2×Vcc
Input
In phase output
10 %
tr
90 %
Vref
tPLH
Vref
tf
90 %
Vref
10 %
tPHL
Vref
VIH
GND
VOH
VOL
6
6 Page | |||
ページ | 合計 : 9 ページ | ||
|
PDF ダウンロード | [ HD74LVC245A データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
部品番号 | 部品説明 | メーカ |
HD74LVC245 | Octal Bidirectional Transceivers with 3-state Outputs | Hitachi Semiconductor |
HD74LVC245A | Octal Bidirectional Transceivers with 3-state Outputs | Hitachi Semiconductor |
HD74LVC245A | Octal Bidirectional Transceivers | Hitachi Semiconductor |
HD74LVC245AFP | Octal Bidirectional Transceivers with 3-state Outputs | Hitachi Semiconductor |