74HC_HCT2G34_1

Product data sheet

Rev. 01 — 6 October 2006

8 of 14

Nexperia

74HC2G34; 74HCT2G34

Dual buffer gate

[1]

tpd is the same as tPLH and tPHL

[2]

tt is the same as tTLH and tTHL

[3]

CPD is used to determine the dynamic power dissipation (PD in µW).

PD =CPD × VCC2 × fi × N+ Σ(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;

Σ(C

L × VCC

2

× f

o) = sum of the outputs.

12. Waveforms

74HCT2G34

tpd

propagation delay

nA to nY; see Figure 5

[1]

VCC = 4.5 V; CL = 50 pF

-

10

18

-

23

29

ns

tt

transition time

nY; see Figure 5

[2]

VCC = 4.5 V; CL = 50 pF

-

6

15

-

19

25

ns

CPD

power dissipation

capacitance

VI = GND to VCC − 1.5 V

[3]

-9-

-

-

-

pF

Table 9.

Dynamic characteristics …continued

Voltages are referenced to GND (ground = 0 V); for test circuit see Figure 6.

Symbol

Parameter

Conditions

25

°C

−40 °C to +125 °C

Unit

Min

Typ

Max

Min

Max

(85

°C)

Max

(125

°C)

Measurement points are given in Table 10.

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

Fig 5.

The data input (nA) to output (nY) propagation delays and output transition times

001aaf302

VI

nA input

tPLH

VM

90 %

90 %

10 %

10 %

VM

tPHL

tTLH

tTHL

GND

VOH

nY output

VOL

Table 10.

Measurement points

Type

Input

Output

VM

VI

tr = tf

VM

74HC2G34

0.5VCC

GND to VCC

6.0 ns

0.5VCC

74HCT2G34

1.3 V

GND to 3.0 V

6.0 ns

1.3 V

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