74LCX257 Datasheet, PDF (5/13 Pages) Fairchild Semiconductor – Low Voltage Quad 2-Input Multiplexer with 5V Tolerant Inputs and Outputs

74LCX257
Table 7: Dynamic Switching Characteristics
Test Condition
Value
Symbol
Parameter
V_OLP
V_OLV
Dynamic Low Level Quiet
Output (note 1)
V_CC
T_A = 25 °C
Unit
(V)
Min. Typ. Max.
3.3
C_L = 50pF
V_IL = 0V, V_IH = 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.
Table 8: AC Electrical Characteristics
Test Condition
Value
Symbol
Parameter
V_CC
(V)
t_PLH t_PHL
t_PLH t_PHL
t_PZL t_PZH
Propagation Delay
Time (A, B to Y)
Propagation Delay
Time (SELECT to Y)
Output Enable Time
t_PLZ t_PHZ Output Disable Time
t_OSLH
t_OSHL
Output To Output
Skew Time (note1,
2)
2.7
3.0 to 3.6
2.7
3.0 to 3.6
2.7
3.0 to 3.6
2.7
3.0 to 3.6
3.0 to 3.6
C_L R_L t_s = t_r
(pF) (Ω) (ns)
50 500 2.5
50 500 2.5
50 500 2.5
50 500 2.5
50 500 2.5
-40 to 85 °C
Min.
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
Max.
6.5
6.0
8.5
7.0
8.5
7.0
6.0
5.5
1.0
-55 to 125 °C
Min.
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
Max.
6.5
6.0
8.5
7.0
8.5
7.0
6.0
5.5
1.0
Unit
ns
ns
ns
ns
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 (t_OSLH = | t_PLHm - t_PLHn|, t_OSHL = | t_PHLm - t_PHLn|)
2) Parameter guaranteed by design
Table 9: Capacitive Characteristics
Test Condition
Value
Symbol
Parameter
V_CC
(V)
C_IN Input Capacitance
3.3
C_OUT Output Capacitance
3.3
C_PD Power Dissipation Capacitance
3.3
(note 1)
V_IN = 0 to V_CC
V_IN = 0 to V_CC
f_IN = 10MHz
V_IN = 0 or V_CC
T_A = 25 °C
Unit
Min. Typ. Max.
7
pF
8
pF
25
pF
1) C_PD 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/4 (per
channel)
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