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74F621 の電気的特性と機能

74F621のメーカーはPhilipsです、この部品の機能は「Octal bus transceiver / non-inverting open collector」です。


製品の詳細 ( Datasheet PDF )

部品番号 74F621
部品説明 Octal bus transceiver / non-inverting open collector
メーカ Philips
ロゴ Philips ロゴ 




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74F621 Datasheet, 74F621 PDF,ピン配置, 機能
INTEGRATED CIRCUITS
74F621
Octal bus transceiver, non-inverting
(open collector)
Product specification
IC15 Data Handbook
1996 Jan 05
Philips
Semiconductors

1 Page





74F621 pdf, ピン配列
Philips Semiconductors
Octal bus transceiver, non-inverting (open collector)
Product specification
74F621
LOGIC SYMBOL
23 4 56 7 89
A0 A1 A2 A3 A4 A5 A6 A7
1 OEAB
19 OEBA
B0 B1 B2 B3 B4 B5 B6 B7
VCC = Pin 20
GND = Pin 10
18 17 16 15 14 13 12 11
SF01126
LOGIC DIAGRAM
19
OEBA
OEAB 1
A0 2
A1 3
A2 4
A3 5
A4 6
A5 7
A6 8
A7 9
VCC = Pin 20
GND = Pin 10
18 B0
17 B1
16
B2
15 B3
14 B4
13
B5
12 B6
11 B7
SF01130
LOGIC SYMBOL (IEEE/IEC)
19 EN1
1
EN2
21
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
SF01137
FUNCTION TABLE
INPUTS
OEBA
OEAB
OPERATING MODES
LL
B data to A bus
HH
A data to B bus
HL
OFF
LH
B data to A bus
A data to B bus
H = High voltage level
L = Low voltage level
X = Don’t care
OFF= High if pull-up resistor is connected to open collector output
1996 Jan 05
3


3Pages


74F621 電子部品, 半導体
Philips Semiconductors
Octal bus transceiver, non-inverting (open collector)
Product specification
74F621
TYPICAL PROPAGATION DELAYS VERSUS LOAD FOR OPEN COLLECTOR OUTPUTS
18
16
14
12
10
Propagation
delay (ns) 8
tPLH
6
tPHL
4
2
0
0 100 200 300 400 500 600
Load Resistor (W)
SF01153
NOTE:
When using open-collector parts, the value of the pull-up resistor greatly affects the value of the tPLH. For example, changing the pull-up
resistor value from 500W to 100W will improve the tPLH up to 50% with only slight increase in the tPHL. However, if the pull-up resistor is
changed, the user must take certain that the total IOL current through the resistor and the total IIL’s of the receivers do not exceed the IOL
maximum specification.
TEST CIRCUIT AND WAVEFORMS
VCC
7.0V
90%
tw
90%
AMP (V)
PULSE
GENERATOR
VIN
VOUT
D.U.T.
RL
NEGATIVE
PULSE
VM
10%
tTHL (tf )
VM
10%
tTLH (tr )
0V
RT CL RL
Test Circuit for Open Collector Outputs
POSITIVE
PULSE
tTLH (tr )
90%
VM
tTHL (tf )
90%
VM
AMP (V)
DEFINITIONS:
RL = Load resistor;
see AC electrical characteristics for value.
CL = Load capacitance includes jig and probe capacitance;
see AC electrical characteristics for value.
RT = Termination resistance should be equal to ZOUT of
pulse generators.
10%
tw
10%
0V
Input Pulse Definition
INPUT PULSE REQUIREMENTS
family
amplitude VM rep. rate
tw tTLH
tTHL
74F 3.0V 1.5V 1MHz 500ns 2.5ns 2.5ns
SF00027
1996 Jan 05
6

6 Page



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共有リンク

Link :


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