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74AHC245

Octal bus transceiver; 3-state

NXP Semiconductors. 

NXP Semiconductors

74AHC245; 74AHCT245

Octal bus transceiver; 3-state

Table 7. Dynamic characteristics …continued

GND = 0 V. For test circuit see Figure 7.

Symbol Parameter Conditions

For type 74AHCT245

tpd

propagation nAn to nYn; see Figure 5

delay

VCC = 4.5 V to 5.5 V

CL = 15 pF

CL = 50 pF

ten

enable time nOE to nYn; see Figure 6

VCC = 4.5 V to 5.5 V

CL = 15 pF

CL = 50 pF

tdis

disable time nOE to nYn; see Figure 6

VCC = 4.5 V to 5.5 V

CL = 15 pF

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

[2]

- 3.5 7.7 1.0

8.5

1.0

10.0 ns

- 4.5 8.7 1.0

9.5

1.0

11.0 ns

- 5.0 13.8 1.0

15.0

1.0

17.5 ns

- 6.0 14.8 1.0

16.0

1.0

18.5 ns

[2]

- 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

[3] -

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.

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 Volts.

11. Waveforms

VI

An, Bn input

GND

VOH

tPLH

Bn, An output

VOL

VM

VM

VM

tPHL

VM

mna176

Measurement points are given in Table 8.

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

Fig 5. Propagation delay input (An, Bn) to output (Bn, An)

74AHC_AHCT245_3

Product data sheet

Rev. 03 — 25 September 2007

© NXP B.V. 2007. All rights reserved.

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