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74LVC244A Arkusz danych(PDF) 4 Page - STMicroelectronics

Numer części 74LVC244A
Szczegółowy opis  LOW VOLTAGE CMOS QUAD BUS BUFFERS (3-STATE) HIGH PERFORMANCE
PDF  9 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

74LVC244A Arkusz danych(HTML) 4 Page - STMicroelectronics

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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 (tOSLH = | tPLHm - tPLHn|, tOSHL = | tPHLm - tPHLn|
2) Parameter guaranteed by design
CAPACITIVE CHARACTERISTICS
1) CPD 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. ICC(opr) = CPD x VCC x fIN + ICC/n (per circuit)
Symbol
Parameter
Test Condition
Value
Unit
VCC
(V)
TA = 25 °C
Min.
Typ.
Max.
VOLP
Dynamic Low Level Quiet
Output (note 1)
3.3
CL = 50pF
VIL = 0V, VIH = 3.3V
0.8
V
VOLV
-0.8
Symbol
Parameter
Test Condition
Value
Unit
VCC
(V)
CL
(pF)
RL
(
Ω)
ts = tr
(ns)
-40 to 85 °C
-55 to 125 °C
Min.
Max.
Min.
Max.
tPLH tPHL
Propagation Delay
Time
1.65 to 1.95
30
1000
2.0
9.0
12
ns
2.3 to 2.7
30
500
2.0
7.9
10.5
2.7
50
500
2.5
1.5
6.9
8.3
3.0 to 3.6
50
500
2.5
1
5.9
7.1
tPZL tPZH
Output Enable Time
1.65 to 1.95
30
1000
2.0
11
14.3
ns
2.3 to 2.7
30
500
2.0
9.6
12.5
2.7
50
500
2.5
1
8.6
10.3
3.0 to 3.6
50
500
2.5
1
7.6
9.1
tPLZ tPHZ
Output Disable Time 1.65 to 1.95
30
1000
2.0
9.0
11.7
ns
2.3 to 2.7
30
500
2.0
7.8
10.1
2.7
50
500
2.5
2
6.8
8.2
3.0 to 3.6
50
500
2.5
2
6.5
7.8
tOSLH
tOSHL
Output To Output
Skew Time (note1,
2)
2.7 to 3.6
1
1
ns
Symbol
Parameter
Test Condition
Value
Unit
VCC
(V)
TA = 25 °C
Min.
Typ.
Max.
CIN
Input Capacitance
4pF
CPD
Power Dissipation Capacitance
(note 1)
1.8
fIN = 10MHz
28
pF
2.5
30
3.3
34



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