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HD74LVC245A の電気的特性と機能

HD74LVC245AのメーカーはHitachi Semiconductorです、この部品の機能は「Octal Bidirectional Transceivers」です。


製品の詳細 ( Datasheet PDF )

部品番号 HD74LVC245A
部品説明 Octal Bidirectional Transceivers
メーカ Hitachi Semiconductor
ロゴ Hitachi Semiconductor ロゴ 




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HD74LVC245A Datasheet, HD74LVC245A PDF,ピン配置, 機能
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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

1 Page





HD74LVC245A pdf, ピン配列
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 電子部品, 半導体
HD74LVC245A
Test Circuit
VCC
VCC
Input
Pulse
Generator
Zout = 50
OE
T/R
S1
A0
B0
Output
500 S2
CL = 450
50 pF 50 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



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共有リンク

Link :


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