SL74HC257
AC ELECTRICAL CHARACTERISTICS(CL=50pF,Input tr=tf=6.0 ns)
VCC
Guaranteed Limit
Symbol
Parameter
V
25 °C to £85°C
-55°C
£125°C
Unit
ns
tPLH, tPHL Maximum Propagation Delay, Nibble A or B to
Output Y (Figures 1and 4)
2.0
4.5
6.0
100
20
125
25
150
30
26
17
21
tPLH, tPHL Maximum Propagation Delay , Select to
Output Y (Figures 2 and 4)
2.0
4.5
6.0
100
20
17
125
25
21
150
30
26
ns
ns
ns
ns
tPLZ, tPHZ Maximum Propagation Delay , Output Enable to
Output Y (Figures 3 and 5)
2.0
4.5
6.0
150
30
26
190
38
33
225
45
38
tPZL, tPZH Maximum Propagation Delay , Output Enable to
Output Y (Figures 3 and 5)
2.0
4.5
6.0
150
30
26
190
38
33
225
45
38
tTLH, tTHL Maximum Output Transition Time, Any Output
(Figures 1 and 4)
2.0
4.5
6.0
60
12
10
75
15
13
90
18
15
CIN
Maximum Input Capacitance
-
-
10
15
10
15
10
15
pF
pF
COUT
Maximum Three-State Output Capacitance
(Output in High-Impedance State)
Power Dissipation Capacitance (Per Package)
Typical @25°C,VCC=5.0 V
CPD
Used to determine the no-load dynamic power
consumption:
39
pF
PD=CPDVCC2f+ICCVCC
Figure 1. Switching Waveforms
Figure 2. Switching Waveforms
System Logic
SLS
SLS [ SYSTEM LOGIC SEMICONDUCTOR ]
