74AHCT2G08GD datasheet(7/14 Pages) NXP

7 / 14 page

74AHC_AHCT2G08_3

Product data sheet

Rev. 03 — 12 January 2009

7 of 14

NXP Semiconductors

74AHC2G08; 74AHCT2G08

Dual 2-input AND gate

[1]

tpd is the same as tPLH and tPHL.

[2]

Typical values are measured at VCC = 3.3 V.

[3]

Typical values are measured at VCC = 5.0 V.

[4]

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

× f

o) = sum of the outputs.

12. Waveforms

74AHCT2G08

tpd

propagation

delay

nA, nB to nY; see Figure 6

[1]

VCC = 4.5 V to 5.5 V

[3]

CL = 15 pF

3.6

6.2

1.0

7.1

1.0

8.0

CL = 50 pF

5.1

7.9

1.0

9.0

1.0

10.5

CPD

power

dissipation

capacitance

per buffer;

CL = 50 pF; fi = 1 MHz;

VI = GND to VCC

[4]

-19-

Table 8.

Dynamic characteristics …continued

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

Symbol Parameter

Conditions

°C

−40 °C to +85 °C −40 °C to +125 °C Unit

Min

Typ

Max

Min

Max

Min

Max

Fig 6.

The input (nA and nB) to output (nY) propagation delays.

mna224

nA, nB input

nY output

tPLH

tPHL

GND

VOH

VOL

Table 9.

Measurement points

Type

Input

Output

74AHC2G08

0.5VCC

74AHCT2G08

1.5 V

0.5VCC

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