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HD74BC640A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 | HD74BC640A |
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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HD74BC640Aダウンロード(pdfファイル)リンクがあります。 Total 9 pages
HD74BC640A
Octal Bus Transceivers With 3 State Outputs
ADE-205-026 (Z)
Rev.0
June 1993
Description
The HD74BC640A 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 eight bus transceivers 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 high,
data flows from the B inputs to the A outputs. When enable inputs (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.
• Input pins can be open, when not used, owing to built in input pull up circuit.
• Input is TTL level.
• Wide operating temperature range
Ta = –40 to +85°C.
Function Table
Control Inputs
G
L
L
H
H : High level
L : Low level
X : Immaterial
DIR
L
H
X
Operation
B data to A bus
A data to B bus
Isolation
1 Page Recommended Operating Conditions
Item
Symbol
Min
Typ
Supply voltage
Input voltage
Ouput 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
HD74BC640A
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 HD74BC640A
Test Circuit
VCC
Input
Pulse
Generator
Zout = 50 Ω
VCC
G
A1 S1
B1
Output
CL =
50 pF
500 Ω
450 Ω
50 Ω
Scope
DIR
OPEN *4
7V
Notes:
1. CL includes probe and jig capacitance.
2. A2-B2 to A8-B8 are identical to above load circuit.
3. S1: Input-Output change switch.
4. Open: tPLH, tPHL, tZH tHZ
7 V: tZL, tLZ
Waveforms-1
Input
Output
tf
90 %
1.5 V
10 %
tPLH
1.5 V
tr
90 %
1.5 V
10 %
tPHL
1.5 V
3V
0V
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 | [ HD74BC640A 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 |
HD74BC640A | Octal Bus Transceivers With 3 State Outputs | Hitachi Semiconductor |