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HD74BC245AのメーカーはHitachi Semiconductorです、この部品の機能は「Octal Bus Transceivers With 3 State Outputs」です。 |
部品番号 | HD74BC245A |
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部品説明 | Octal Bus Transceivers With 3 State Outputs | ||
メーカ | Hitachi Semiconductor | ||
ロゴ | |||
このページの下部にプレビューとHD74BC245Aダウンロード(pdfファイル)リンクがあります。 Total 8 pages
HD74BC245A
Octal Bus Transceivers With 3 State Outputs
ADE-205-008A (Z)
Rev. 1
March 1993
Description
The HD74BC245A provides high drivability and operation equal to or better than high speed bipolar
standard logic IC by using Bi-CMOS process. The device features low power dissipation that is about 1/5
of high speed bipolar logic IC, when the frequency is 10 MHz. The device has ten buffers with three state
outputs in a 20 pin package. Each device has an active low enable input G and a direction control input
DiR. When DiR is high, data flows from the A inputs to the B outputs. When DiR is low, data flows from
the B inputs to the A outputs. When G is high, disables both A and B ports by placing then in a high
impedance.
Features
• Input/Output are at high impedance state when power supply is off.
• Built in input pull up circuit can make input pins be open, when not used.
• TTL level input
• Wide operating temperature range
Ta = –40 to + 85°C
Function Table
Control Inputs
G
L
L
H
H : High level
L : Low level
Z : High impedance
DiR
L
H
X
Operation
B data to A bus
A data to B bus
Z
1 Page Recommended Operating Conditions
Item
Symbol
Min
Typ
Supply voltage
Input voltage
Output voltage
Operating temperature
VCC
VIN
VOUT
Topr
4.5
0
0
–40
5.0
—
—
—
Input rise/fall time*1
tr, tf
0
—
Note: 1. This item guarantees maximum limit when one input switches.
Waveform: Refer to test circuit of switching characteristics.
Max
5.5
VCC
VCC
85
8
HD74BC245A
Unit
V
V
V
°C
ns/V
Logic Diagram
DiR
A1
A2
A3
A4
A5
A6
A7
A8
G
B1
B2
B3
B4
B5
B6
B7
B8
3
3Pages HD74BC245A
Waveforms-1
Input
Output
Waveforms-2
tr
90%
1.5 V
10%
tPLH
1.5 V
tf
90%
1.5 V
10%
tPHL
1.5 V
3V
0V
VOH
VOL
G
Waveform–A
tf
90%
1.5 V
10%
t ZL
1.5 V
t ZH
tr
90%
1.5 V
10%
t LZ
VOL + 0.3 V
t HZ
3V
0V
3.5 V
VOL
Waveform–B
1.5 V
VOH – 0.3 V
VOH
Notes:
0V
1. tr = 2.5 ns, tf = 2.5 ns
2. Input waveform: PRR = 1 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.
6
6 Page | |||
ページ | 合計 : 8 ページ | ||
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PDF ダウンロード | [ HD74BC245A 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 |
HD74BC245A | Octal Bus Transceivers With 3 State Outputs | Hitachi Semiconductor |