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| CD54AC138 Datasheet, PDF (6/7 Pages) Texas Instruments – 3-to-8-Line Decoders/Demultiplexers | |||
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CD54/74AC138, CD54/74ACT138, CD74AC238, CD74ACT238
Switching Speciï¬cations Input tr, tf = 3ns, CL = 50pF (Worst Case) (Continued)
-40oC TO 85oC
-55oC TO 125oC
PARAMETER
Propagation Delay,
E3 to Output
(CD74AC/ACT238)
SYMBOL
VCC (V)
MIN
tPLH, tPHL
5
3.5
TYP
MAX
MIN
TYP
MAX UNITS
-
12.4
3.4
-
13.6
ns
Input Capacitance
CI
-
Power Dissipation Capacitance
CPD
-
(Note 13)
-
-
10
-
-
10
pF
-
110
-
-
110
-
pF
NOTES:
10. Limits tested at 100%.
11. 3.3V Min at 3.6V, Max at 3V.
12. 5V Min at 5.5V, Max at 4.5V.
13. CAACCPD:TP:isPDuD=s=eVdVCtCCoC2d2fei ft(ieC(rCPmDPinD+e+CthCLe)Ld) y+nVaCmCicâpIoCwCewr hceornesufim=pintiopnutpfererqpuaecnkcayg,eC. L = output load capacitance, VCC = supply voltage.
tr = 3ns
INPUT
tf = 3ns
90%
VS
10% GND
138 OUTPUT
VS
tPHL
tPLH
238 OUTPUT
tPLH
VS
tPHL
FIGURE 1. PROPAGATION DELAY TIMES
tr = 3ns
E1, E2
E3
INPUT
138 OUTPUT
tPHL
238 OUTPUT tPLH
tf = 3ns
90%
VS
GND
VS
tPLH
VS
tPHL
FIGURE 2. PROPAGATION DELAY TIMES
OUTPUT
DUT
RL (NOTE)
500â¦
OUTPUT
LOAD
CL
50pF
NOTE: For AC Series Only: When VCC = 1.5V, RL = 1kâ¦.
AC
Input Level
Input Switching Voltage, VS
Output Switching Voltage, VS
VCC
0.5 VCC
0.5 VCC
FIGURE 3. PROPAGATION DELAY TIMES
ACT
3V
1.5V
0.5 VCC
6
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