74LCX257 データシートの表示（PDF） - STMicroelectronics
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74LCX257
STMicroelectronics
74LCX257 Datasheet PDF : 10 Pages
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74LCX257
DYNAMIC SWITCHING CHARACTERISTICS
Test Condition
Value
Symbol
Parameter
VCC
(V)
TA = 25 °C
Unit
Min. Typ. Max.
VOLP
VOLV
Dynamic Low Level Quiet
Output (note 1)
3.3
CL = 50pF
VIL = 0V, VIH = 3.3V
0.8
-0.8
V
1) Number of outputs 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
Test Condition
Value
Symbol
Parameter
VCC
CL RL ts = tr -40 to 85 °C
-55 to 125 °C Unit
(V)
(pF) (Ω) (ns) Min. Max. Min. Max.
tPLH tPHL Propagation Delay
Time (A, B to Y)
2.7
3.0 to 3.6
50 500 2.5
1.5
1.5
6.5
6.0
1.5
1.5
6.5
6.0
ns
tPLH tPHL Propagation Delay
2.7
Time (SELECT to Y) 3.0 to 3.6
50 500 2.5
1.5
1.5
8.5
7.0
1.5
1.5
8.5
7.0
ns
tPZL tPZH Output EnableTime
2.7
1.5
8.5
1.5
8.5
50 500 2.5
ns
3.0 to 3.6
1.5
7.0
1.5
7.0
tPLZ tPHZ Output DisableTime
2.7
1.5
6.0
1.5
6.0
50 500 2.5
ns
3.0 to 3.6
1.5
5.5
1.5
5.5
tOSLH Output To Output
3.0 to 3.6 50 500 2.5
1.0
tOSHL
Skew Time (note1,
2)
1.0
ns
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
Test Condition
Value
Symbol
Parameter
VCC
(V)
TA = 25 °C
Unit
Min. Typ. Max.
CIN
Input Capacitance
3.3
VIN = 0 to VCC
7
pF
COUT Output Capacitance
3.3
VIN = 0 to VCC
8
pF
CPD Power Dissipation Capacitance
3.3
(note 1)
fIN = 10MHz
VIN = 0 or VCC
25
pF
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/4 (per
channel)
5/10
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