74HC237 データシートの表示（PDF） - NXP Semiconductors.
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74HC237 Datasheet PDF : 17 Pages
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NXP Semiconductors
74HC237
3-to-8 line decoder, demultiplexer with address latches
Table 7. Dynamic characteristics …continued
Voltages are referenced to GND (ground = 0 V); CL = 50 pF unless otherwise specified; for test circuit see Figure 10.
Symbol Parameter Conditions
Tamb = 25 C
Tamb = 40 C
to +85 C
Tamb = 40 C Unit
to +125 C
Min Typ Max Min Max
Min
Max
tW
pulse width LE HIGH; see Figure 9
VCC = 2.0 V
50 11
-
65
-
75
-
ns
VCC = 4.5 V
10
4
-
13
-
15
-
ns
VCC = 6.0 V
9
3
-
11
-
13
-
ns
tsu
set-up time An to LE; see Figure 9
VCC = 2.0 V
50
6
-
65
-
75
-
ns
VCC = 4.5 V
10
2
-
13
-
15
-
ns
VCC = 6.0 V
9
2
-
11
-
13
-
ns
th
hold time An to LE; see Figure 9
-
VCC = 2.0 V
30
3
-
40
-
45
-
ns
VCC = 4.5 V
6
1
-
8
-
9
-
ns
VCC = 6.0 V
5
1
-
7
-
8
-
ns
CPD
power
CL = 50 pF; f = 1 MHz;
[3] -
60 -
-
-
-
-
pF
dissipation VI = GND to VCC
capacitance
[1] tpd is the same as tPLH and tPHL.
[2] tt is the same as tTHL and tTLH.
[3] CPD is used to determine the dynamic power dissipation (PD in W).
PD = CPD VCC2 fi N + (CL VCC2 fo) where:
fi = input frequency in MHz;
fo = output frequency in MHz;
CL = output load capacitance in pF;
VCC = supply voltage in V;
N = number of inputs switching;
(CL VCC2 fo) = sum of outputs.
11. Waveforms
An, E2, LE
input
VM
Yn output
tPHL
VM
tPLH
tTHL
tTLH
001aab873
Fig 7.
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Propagation delay input (An) and enable inputs (E2, LE) to output (Yn) and output transition time
74HC237
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 4 — 10 January 2011
© NXP B.V. 2011. All rights reserved.
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