74HC14D datasheet(6/21 Pages) NXP

6 / 21 page

74HC_HCT14

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Product data sheet

Rev. 6 — 19 September 2012

6 of 21

NXP Semiconductors

74HC14; 74HCT14

Hex inverting Schmitt trigger

11. Dynamic characteristics

[1]

tpd is the same as tPHL and tPLH.

[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;

 (C

L  VCC

 f

o) = sum of outputs.

Table 7.

Dynamic characteristics

GND = 0 V; CL =50 pF; for test circuit see Figure 7.

Symbol Parameter

Conditions

Tamb = 25 C

Tamb = 40 C to

+125

C

Unit

Min

Typ

Max

(85

C)

Max

(125

C)

74HC14

tpd

propagation delay

nA to nY; see Figure 6

[1]

VCC = 2.0 V

125

155

190

VCC = 4.5 V

VCC = 5.0 V; CL =15pF

VCC = 6.0 V

transition time

see Figure 6

[2]

VCC = 2.0 V

110

VCC = 4.5 V

VCC = 6.0 V

CPD

power dissipation

capacitance

per package; VI =GND to VCC

[3]

-7-

74HCT14

tpd

propagation delay

nA to nY; see Figure 6

[1]

VCC = 4.5 V

VCC = 5.0 V; CL =15pF

transition time

VCC = 4.5 V; see Figure 6

[2]

CPD

power dissipation

capacitance

per package;

VI =GND to VCC  1.5 V

[3]

-8-

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