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參數(shù)資料
| 型號(hào)： | 74F38 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Quad 2-input NAND buffer (open collector)(八通道2輸入與非門緩沖器（集電極開(kāi)路）) |
| 中文描述： | 四2輸入與非緩沖器（集電極開(kāi)路）（八通道2輸入與非門緩沖器（集電極開(kāi)路）） |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大?。?/td> | 70K |
| 代理商： | 74F38 |
Philips Semiconductors
Product specification
74F38
Quad 2-input NAND buffer (open collector)
October 4, 1990
4
AC ELECTRICAL CHARACTERISTICS
LIMITS
TEST
V
CC
= +5.0V
T
amb
= +25
°
C
C
L
= 50pF, R
L
= 500
V
CC
= +5.0V
±
10%
T
amb
= 0
°
C to +70
°
C
C
L
= 50pF, R
L
= 500
V
CC
= +5.0V
±
10%
T
amb
= –40
°
C to +85
°
C
C
L
= 50pF, R
L
= 500
SYMBOL
PARAMETER
CONDITION
UNIT
MIN
TYP
MAX
MIN
MAX
MIN
MAX
t
PLH
t
PHL
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
V
M
V
M
V
M
V
M
Qn
Dna, Dnb
t
PHL
t
PLH
SF00005
Waveform 1.
NOTE:
For all waveforms, V
M
= 1.5V.
Propagation delay for inverting outputs
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
t
PHL
t
PLH
Load resistor
(
)
P
SF00044
NOTE:
1
When using open collector parts, the value of the pull-up resistor greatly affects the value of the t
. For example, changing the specified
pull-up resistor value from 500
to 100
will improve the t
PLH
up to 50% with only a slight increase in the t
PHL
. However, if the value of the
pull-up resistor is changed, the user must make certain that the total I
OL
current through the resistor and the total I
IL
’s of the receivers does
not exceed the I
OL
minimum specification.
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