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HD74LVC244AのメーカーはHitachi Semiconductorです、この部品の機能は「Octal Buffers / Line Drivers with 3-state Outputs」です。 |
部品番号 | HD74LVC244A |
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部品説明 | Octal Buffers / Line Drivers with 3-state Outputs | ||
メーカ | Hitachi Semiconductor | ||
ロゴ | |||
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HD74LVC244A
Octal Buffers / Line Drivers with 3-state Outputs
ADE-205-110B(Z)
3rd Edition
December 1996
Description
The HD74LVC244A has eight line drivers with three state outputs in a 20 pin package. This device is a
non inverting buffer and has two active low enables (1G and 2G). Each enable independently controls four
buffers. 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 outputs VOUT (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
GA
HX
LH
LL
H : High level
L : Low level
X : Immaterial
Z : High impedance
Output Y
Z
H
L
1 Page HD74LVC244A
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
VO
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
G, A
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 HD74LVC244A
Test Circuit
VCC
VCC
Input
Pulse generator
Zout = 50 Ω
1G, 2G
1Y1 to 2Y4
1A1 to 2A4
Output
CL =
50 pF
500 Ω S1
450 Ω
50 Ω Scope
OPEN
*1 See under table
GND
Note:
1. CL includes probe and jig capacitance.
Symbol
tPLH / t PHL
tZH/ t HZ
tZL / t LZ
S1
Vcc=2.7V,
3.3±0.3V
Vcc=5.0±0.5V
OPEN OPEN
GND
GND
6 V 2×Vcc
Waveforms – 1
Input A
Output Y
10 %
tr
90 %
Vref
tPLH
Vref
tf
90 %
Vref
10 %
tPHL
Vref
Notes:
1. tr = 2.5 ns, tf = 2.5 ns
2. Input waveform : PRR = 10 MHz, duty cycle 50%
VIH
GND
VOH
VOL
6
6 Page | |||
ページ | 合計 : 9 ページ | ||
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PDF ダウンロード | [ HD74LVC244A 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 |
HD74LVC244 | Octal Buffers / Line Drivers with 3-state Outputs | Hitachi Semiconductor |
HD74LVC244A | Octal Buffers / Line Drivers with 3-state Outputs | Hitachi Semiconductor |
HD74LVC244A | Octal Buffers / Line Drivers | Hitachi Semiconductor |