74HCT27BQ datasheet(7/16 Pages) NXP

No de pièce	74HCT27BQ

Description	Triple 3-input NOR gate

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74HC_HCT27_3

Product data sheet

Rev. 03 — 7 January 2008

7 of 16

NXP Semiconductors

74HC27; 74HCT27

Triple 3-input NOR gate

[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 µW):

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

2

× f

o) = sum of outputs.

11. Waveforms

CPD

power dissipation

capacitance

per package; VI = GND to VCC

[3]

-24-

-

pF

74HCT27

tpd

propagation delay

nA, nB, nC to nY; see Figure 6

[1]

VCC = 4.5 V

-

12

21

26

32

ns

VCC = 5.0 V; CL =15pF

-

10

-

ns

tt

transition time

VCC = 4.5 V; see Figure 6

[2]

-

7

15

19

22

ns

CPD

power dissipation

capacitance

per package;

VI = GND to VCC − 1.5 V

[3]

-30-

-

pF

Table 7.

Dynamic characteristics type 74HC27; 74HCT27

GND = 0 V; for load circuit see Figure 7.

Symbol Parameter

Conditions

25

°C

−40 °C to +125 °C Unit

Min

Typ

Max

(85

°C)

Max

(125

°C)

Measurement points are given in Table 8.

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

Fig 6.

Input (nA, nB, nC) to output (nY) propagation delays and output transition times

001aag761

nA, nB, nC input

VI

GND

VOH

VOL

nY output

tTHL

tTLH

VM

VX

VY

tPHL

tPLH

Table 8.

Measurement points

Type

Input

Output

VM

VX

VY

74HC27

0.5VCC

0.1VCC

0.9VCC

74HCT27

1.3 V

0.1VCC

0.9VCC

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