74HC237_11 Datasheet, PDF (7/17 Pages) NXP Semiconductors – 3-to-8 line decoder, demultiplexer with address latches

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); C_L = 50 pF unless otherwise specified; for test circuit see Figure 10.
Symbol Parameter Conditions
T_amb = 25 C
T_amb = 40 C
to +85 C
T_amb = 40 C Unit
to +125 C
Min Typ Max Min Max
Min
Max
t_W
pulse width LE HIGH; see Figure 9
V_CC = 2.0 V
50 11
-
65
-
75
-
ns
V_CC = 4.5 V
10
4
-
13
-
15
-
ns
V_CC = 6.0 V
9
3
-
11
-
13
-
ns
t_su
set-up time An to LE; see Figure 9
V_CC = 2.0 V
50
6
-
65
-
75
-
ns
V_CC = 4.5 V
10
2
-
13
-
15
-
ns
V_CC = 6.0 V
9
2
-
11
-
13
-
ns
t_h
hold time An to LE; see Figure 9
-
V_CC = 2.0 V
30
3
-
40
-
45
-
ns
V_CC = 4.5 V
6
1
-
8
-
9
-
ns
V_CC = 6.0 V
5
1
-
7
-
8
-
ns
C_PD
power
C_L = 50 pF; f = 1 MHz;
[3] _-
60 -
-
-
-
-
pF
dissipation V_I = GND to V_CC
capacitance
[1] t_pd is the same as t_PLH and t_PHL.
[2] t_t is the same as t_THL and t_TLH.
[3] C_PD is used to determine the dynamic power dissipation (P_D in W).
P_D = C_PD  V_CC2  f_i  N + (C_L  V_CC2  f_o) where:
f_i = input frequency in MHz;
f_o = output frequency in MHz;
C_L = output load capacitance in pF;
V_CC = supply voltage in V;
N = number of inputs switching;
(C_L  V_CC2  f_o) = sum of outputs.
11. Waveforms
An, E2, LE
input
V_M
Yn output
t_PHL
V_M
t_PLH
t_THL
t_TLH
001aab873
Fig 7.
Measurement points are given in Table 8.
V_OL and V_OH 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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