74AHC245BQ(2009) 데이터 시트보기 (PDF) - NXP Semiconductors.

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74AHC245BQ
(Rev.:2009)

Octal bus transceiver; 3-state

NXP Semiconductors. 

Nexperia

74AHC245; 74AHCT245

Octal bus transceiver; 3-state

Table 7. Dynamic characteristics …continued

Voltages are referenced to GND (ground = 0 V); for test circuit see Figure 7.

Symbol Parameter Conditions

25 °C

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

Min Typ[1] Max Min

Max

Min

Max

tdis

disable time OE to An; OE to Bn;

[4]

signal name DIR;

see Figure 6

CL = 15 pF

CL = 50 pF

CPD

power

fi = 1 MHz;

dissipation VI = GND to VCC

capacitance

- 5.0 14.4 1.0

15.5

1.0

18.0 ns

- 6.0 15.4 1.0

16.5

1.0

19.5 ns

[5] -

15 -

-

-

-

-

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.

[3] ten is the same as tPZL and tPZH.

[4] tdis is the same as tPLZ and tPHZ.

[5] 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(CL × VCC2 × fo) = sum of the outputs.

10.1 Waveforms

VI

An, Bn input

GND

VOH

tPLH

Bn, An output

VOL

VM

VM

VM

tPHL

VM

mna176

Fig 5.

Measurement points are given in Table 8.

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

Input to output propagation delays

74AHC_AHCT245_5

Product data sheet

Rev. 05 — 28 April 2009

© Nexperia B.V. 2017. All rights reserved

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