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74AHC245BQ View Datasheet(PDF) - NXP Semiconductors.

Part NameDescriptionManufacturer
74AHC245BQ Octal bus transceiver; 3-state NXP
NXP Semiconductors. NXP
74AHC245BQ Datasheet PDF : 16 Pages
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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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