74AHC574BQ 查看數據表（PDF） - NXP Semiconductors.

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74AHC574BQ

Octal D-type flip-flop; positive edge-trigger; 3-state

NXP Semiconductors. 

NXP Semiconductors

74AHC574; 74AHCT574

Octal D-type flip-flop; positive edge-trigger; 3-state

Table 7. Dynamic characteristics …continued

GND = 0 V. For test circuit see Figure 10.

Symbol Parameter Conditions

th

hold time Dn to CP; see Figure 8

VCC = 4.5 V to 5.5 V;

CL = 50 pF

CPD

power

per buffer;

dissipation CL = 50 pF; f = 1 MHz;

capacitance VI = GND to VCC

25 °C

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

Min Typ[1] Max Min

Max

Min

Max

1.5 -

- 1.5

-

1.5

-

ns

[3] -

12 -

-

-

-

-

pF

[1] Typical values are measured at nominal supply voltage (VCC = 3.3 V and VCC = 5.0 V).

[2] tpd is the same as tPLH and tPHL.

ten is the same as tPZL and tPZH.

tdis is the same as tPLZ and tPHZ.

[3] CPD is used to determine the dynamic power dissipation PD (µW).

PD = CPD × VCC2 × fi + ∑ (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.

10.1 Waveforms

VI

CP input

GND

VOH

Qn output

VOL

1/ fmax

VM

tW

t PHL

VM

t PLH

mna802

Fig 7.

Measurement points are given in Table 8.

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

Propagation delay input (CP) to output (Qn), clock input (CP) pulse width and the maximum frequency

(CP)

74AHC_AHCT574_2

Product data sheet

Rev. 02 — 24 January 2008

© NXP B.V. 2008. All rights reserved.

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