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參數(shù)資料
| 型號(hào)： | 933769320602 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 總線收發(fā)器 |
| 英文描述： | F/FAST SERIES, OCTAL 1-BIT TRANSCEIVER, TRUE OUTPUT, PDIP20 |
| 封裝： | 0.300 INCH, PLASTIC, SOT-146-1, DIP-20 |
| 文件頁數(shù)： | 7/10頁 |
| 文件大小： | 87K |
| 代理商： | 933769320602 |
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
300
400
500
600
18
16
14
12
10
8
6
4
2
0
Load Resistor (
W)
Propagation
delay (ns)
tPLH
tPHL
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 500
W 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
tw
90%
VM
10%
90%
VM
10%
90%
VM
10%
90%
VM
10%
NEGATIVE
PULSE
POSITIVE
PULSE
tw
AMP (V)
0V
tTHL (tf )
INPUT PULSE REQUIREMENTS
rep. rate
tw
tTLH
tTHL
1MHz
500ns
2.5ns
Input Pulse Definition
VCC
family
74F
D.U.T.
PULSE
GENERATOR
RL
CL
RT
VIN
VOUT
Test Circuit for Open Collector Outputs
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.
tTHL (tf )
tTLH (tr )
AMP (V)
amplitude
3.0V
1.5V
VM
RL
7.0V
SF00027
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