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參數(shù)資料
| 型號(hào)： | 74F621 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Octal bus transceiver, non-inverting (open collector)(八通道總線收發(fā)器，同向（集電極開路）) |
| 中文描述： | 八路總線收發(fā)器，非反相（集電極）（八通道總線收發(fā)器，同向（集電極開路）） |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 77K |
| 代理商： | 74F621 |
Philips Semiconductors
Product specification
74F621
Octal bus transceiver, non-inverting (open collector)
1996 Jan 05
6
TYPICAL PROPAGATION DELAYS VERSUS LOAD FOR OPEN COLLECTOR OUTPUTS
0
100
200
Load Resistor ( )
300
400
500
600
18
16
14
12
10
8
6
4
2
0
Propagation
delay (ns)
t
PLH
t
PHL
SF01153
NOTE:
When using open-collector parts, the value of the pull-up resistor greatly affects the value of the t
PLH
. For example, changing the pull-up
resistor value from 500 to 100 will improve the t
PLH
up to 50% with only slight increase in the t
PHL
. However, if the pull-up resistor is
changed, the user must take certain that the total I
OL
current through the resistor and the total I
IL
’s of the receivers do not exceed the I
OL
maximum specification.
TEST CIRCUIT AND WAVEFORMS
t
w
90%
V
M
10%
90%
V
M
10%
90%
V
M
10%
90%
V
M
10%
NEGATIVE
PULSE
POSITIVE
PULSE
t
w
AMP (V)
0V
0V
t
THL (
t
f
)
INPUT PULSE REQUIREMENTS
rep. rate
t
w
t
TLH
t
THL
1MHz
500ns
2.5ns
2.5ns
Input Pulse Definition
V
CC
family
74F
D.U.T.
PULSE
GENERATOR
R
L
C
L
R
T
V
IN
V
OUT
Test Circuit for Open Collector Outputs
DEFINITIONS:
R
L
=
Load resistor;
see AC electrical characteristics for value.
Load capacitance includes jig and probe capacitance;
see AC electrical characteristics for value.
Termination resistance should be equal to Z
OUT
of
pulse generators.
C
L
=
R
T
=
t
THL (
t
f
)
t
TLH (
t
r
)
t
TLH (
t
r
)
AMP (V)
amplitude
3.0V
1.5V
V
M
R
L
7.0V
SF00027
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 74F623DC | Single 8-bit Bus Transceiver |
| 54F620LM | Single 8-Bit Inverting Bus Transceiver |
| 54F620LMQB | Single 8-Bit Inverting Bus Transceiver |
| 54F623DM | Single 8-bit Bus Transceiver |
| 54F623DMQB | Single 8-bit Bus Transceiver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 74F621N | 制造商:NXP Semiconductors 功能描述: |
| 74F623 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Octal bus transceiver, inverting 3tate |
| 74F623 WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| 74F623DC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Single 8-bit Bus Transceiver |
| 74F623N | 制造商:NXP Semiconductors 功能描述: |
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