74HC_HCT138_15 Datasheet, PDF(8/19 Page) NXP Semiconductors – 3-to-8 line decoder/demultiplexer; inverting

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74HC_HCT138_15 Datasheet, PDF (8/19 Pages) NXP Semiconductors – 3-to-8 line decoder/demultiplexer; inverting

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NXP Semiconductors

74HC138; 74HCT138

3-to-8 line decoder/demultiplexer; inverting

Table 7. Dynamic characteristics â¦continued

Voltages are referenced to GND (ground = 0 V); CL = 50 pF unless otherwise specified; for test circuit see Figure 8.

Symbol Parameter Conditions

Tamb = 25 ï°C

Tamb = ï40 ï°C

to +85 ï°C

Tamb = ï40 ï°C

to +125 ï°C

Min Typ Max Min Max

Min

Max

74HCT138

tpd

propagation An to Yn; see Figure 6

[1]

delay

VCC = 4.5 V

20 35

VCC = 5 V; CL = 15 pF

E3 to Yn; see Figure 6

[1]

VCC = 4.5 V

18 40

VCC = 5 V; CL = 15 pF

En to Yn; see Figure 7

[1]

VCC = 4.5 V

19 40

VCC = 5 V; CL = 15 pF

transition Yn; see Figure 6 and

[2]

time

Figure 7

VCC = 4.5 V

7 15

CPD

power

CL = 50 pF; f = 1 MHz;

[3] -

67 -

dissipation VI = GND to VCC ï 1.5 V

capacitance

Unit

[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 ïW).

PD = CPD ï´ VCC2 ï´ fi ï´ N + ï¥(CL ï´ VCC2 ï´ 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;

ï¥(CL ï´ VCC2 ï´ fo) = sum of outputs.

74HC_HCT138

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 5 â 26 January 2015

8 of 19

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