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參數資料
| 型號： | 74LVC244A |
| 廠商： | 意法半導體 |
| 英文描述： | LOW VOLTAGE CMOS QUAD BUS BUFFERS (3-STATE) HIGH PERFORMANCE |
| 中文描述： | 低電壓CMOS四總線緩沖器（三態）高性能 |
| 文件頁數： | 4/9頁 |
| 文件大小： | 180K |
| 代理商： | 74LVC244A |
74LVC244A
4/9
DYNAMIC SWITCHING CHARACTERISTICS
1) Number of output defined as "n". Measured with "n-1" outputs switching from HIGH to LOW or LOW to HIGH. The remaining output is
measured in the LOW state.
AC ELECTRICAL CHARACTERISTICS
1) Skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs of the same device switch-
ing in the same direction, either HIGH or LOW (t
OSLH
= | t
PLHm
- t
PLHn
|, t
OSHL
= | t
PHLm
- t
PHLn
|
2) Parameter guaranteed by design
CAPACITIVE CHARACTERISTICS
1) C
is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. I
CC(opr)
= C
PD
x V
CC
x f
IN
+ I
CC
/n (per circuit)
Symbol
Parameter
Test Condition
Value
Unit
V
CC
(V)
T
A
= 25 °C
Min.
Typ.
Max.
V
OLP
V
OLV
Dynamic Low Level Quiet
Output (note 1)
3.3
C
L
= 50pF
V
IL
= 0V, V
IH
= 3.3V
0.8
-0.8
V
Symbol
Parameter
Test Condition
Value
Unit
V
CC
(V)
C
L
(pF)
R
L
(
)
t
s
=
t
r
(ns)
-40 to 85 °C
-55 to 125 °C
Min.
Max.
Min.
Max.
t
PLH
t
PHL
Propagation Delay
Time
1.65 to 1.95
2.3 to 2.7
2.7
3.0 to 3.6
1.65 to 1.95
2.3 to 2.7
2.7
3.0 to 3.6
30
30
50
50
30
30
50
50
30
30
50
50
1000
500
500
500
1000
500
500
500
1000
500
500
500
2.0
2.0
2.5
2.5
2.0
2.0
2.5
2.5
2.0
2.0
2.5
2.5
9.0
7.9
6.9
5.9
11
9.6
8.6
7.6
9.0
7.8
6.8
6.5
1
12
10.5
8.3
7.1
14.3
12.5
10.3
9.1
11.7
10.1
8.2
7.8
1
ns
1.5
1
t
PZL
t
PZH
Output Enable Time
ns
1
1
t
PLZ
t
PHZ
Output Disable Time 1.65 to 1.95
ns
2.3 to 2.7
2.7
3.0 to 3.6
2.7 to 3.6
2
2
t
OSLH
t
OSHL
Output To Output
Skew Time (note1,
2)
ns
Symbol
Parameter
Test Condition
Value
Unit
V
CC
(V)
T
A
= 25 °C
Min.
Typ.
Max.
C
IN
C
PD
Input Capacitance
Power Dissipation Capacitance
(note 1)
4
28
30
34
pF
1.8
2.5
3.3
f
IN
= 10MHz
pF
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