Nexperia

74HC237

3-to-8 line decoder, demultiplexer with address latches

25 °C

-40 °C to +85 °C -40 °C to +125 °C

Symbol Parameter

Conditions

Min

Typ Max

Min

Max

Min

Max

Unit

An to LE; see Fig. 9

-

VCC = 2.0 V

30

3

-

40

-

45

-

ns

VCC = 4.5 V

6

1

-

8

-

9

-

ns

th

hold time

VCC = 6.0 V

5

1

-

7

-

8

-

ns

CPD

power

dissipation

capacitance

CL = 50 pF; f = 1 MHz;

VI = GND to VCC

[3]

-

60

-

-

-

-

-

pF

[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 μW).

PD = CPD × VCC 2 × fi × N + ∑(CL × VCC 2 × 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 × VCC 2 × fo) = sum of outputs.

10.1. Waveforms and test circuit

001aab873

An, E2, LE

input

Yn output

VM

tPHL

tTHL

tTLH

tPLH

VM

90 %

90 %

10 %

10 %

Measurement points are given in Table 8.

VOL and VOH are typical voltage output levels that occur with the output load.

Fig. 7. Propagation delay input (An) and enable inputs (E2, LE) to output (Yn) and output transition time

001aab874

E1 input

Yn output

VM

tPHL

tTHL

tTLH

tPLH

VM

90 %

90 %

10 %

10 %

Measurement points are given in Table 8.

VOL and VOH are typical voltage output levels that occur with the output load.

Fig. 8. Propagation enable inputs (E1) to output (Yn) and output transition time

74HC237

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Product data sheet

Rev. 8 — 26 October 2021

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