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| 型號： | 933754090602 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 門電路 |
| 英文描述： | F/FAST SERIES, QUAD 2-INPUT NAND GATE, PDSO14 |
| 封裝： | 3.90 MM, PLASTIC, SOT-108-1, SO-14 |
| 文件頁數(shù)： | 4/8頁 |
| 文件大小： | 70K |
| 代理商： | 933754090602 |
Philips Semiconductors
Product specification
74F38
Quad 2-input NAND buffer (open collector)
October 4, 1990
4
AC ELECTRICAL CHARACTERISTICS
LIMITS
TEST
VCC = +5.0V
VCC = +5.0V ± 10%
SYMBOL
PARAMETER
TEST
CONDITION
Tamb = +25°C
Tamb = 0°C to +70°C
Tamb = –40°C to +85°C
UNIT
CONDITION
CL = 50pF, RL = 500
MIN
TYP
MAX
MIN
MAX
MIN
MAX
tPLH
tPHL
Propagation delay
Dna, Dnb to Qn
Waveform 1
7.5
1.5
10.0
3.0
12.5
5.0
7.5
1.5
13.0
5.5
7.5
1.5
14.5
6.0
ns
AC WAVEFORMS
VM
Qn
Dna, Dnb
tPHL
tPLH
SF00005
Waveform 1.
Propagation delay for inverting outputs
NOTE:
For all waveforms, VM = 1.5V.
TYPICAL PROPAGATION DELAYS VERSUS LOAD FOR OPEN COLLECTOR OUTPUTS
0
2
4
6
8
10
12
14
16
18
0
100
200
300
400
500
600
tPHL
tPLH
Load resistor
()
Propagation
delay
(ns)
SF00044
NOTE:
1
When using open collector parts, the value of the pull-up resistor greatly affects the value of the tPLH. For example, changing the specified
pull-up resistor value from 500
to 100 will improve the tPLH up to 50% with only a slight increase in the tPHL. However, if the value of the
pull-up resistor is changed, the user must make certain that the total IOL current through the resistor and the total IIL’s of the receivers does
not exceed the IOL minimum specification.
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