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HD74BC245A の電気的特性と機能

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。


製品の詳細 ( Datasheet PDF )

部品番号 HD74BC245A
部品説明 Octal Bus Transceivers With 3 State Outputs
メーカ Hitachi Semiconductor
ロゴ Hitachi Semiconductor ロゴ 




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HD74BC245A Datasheet, HD74BC245A PDF,ピン配置, 機能
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





HD74BC245A pdf, ピン配列
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 電子部品, 半導体
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



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部品番号部品説明メーカ
HD74BC245A

Octal Bus Transceivers With 3 State Outputs

Hitachi Semiconductor
Hitachi Semiconductor


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