Datasheet

74AHC_AHCT245_5 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 05 — 28 April 2009 7 of 16
NXP Semiconductors
74AHC245; 74AHCT245
Octal bus transceiver; 3-state
10. Dynamic characteristics
Table 7. Dynamic characteristics
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
74AHC245
t
pd
propagation
delay
An to Bn; Bn to An;
see
Figure 5
[2]
V
CC
= 3.0 V to 3.6 V
C
L
= 15 pF - 5.0 8.4 1.0 10.0 1.0 10.5 ns
C
L
= 50 pF - 6.5 11.9 1.0 13.5 1.0 15.0 ns
V
CC
= 4.5 V to 5.5 V
C
L
= 15 pF - 3.5 5.5 1.0 6.5 1.0 7.0 ns
C
L
= 50 pF 5.0 7.5 1.0 8.5 1.0 9.5 ns
t
en
enable time OE to An; OE to Bn;
signal name DIR;
see
Figure 6
[3]
V
CC
= 3.0 V to 3.6 V
C
L
= 15 pF - 6.5 13.2 1.0 15.5 1.0 16.5 ns
C
L
= 50 pF - 9.0 16.7 1.0 19.0 1.0 21.0 ns
V
CC
= 4.5 V to 5.5 V
C
L
= 15 pF - 4.0 8.5 1.0 10.0 1.0 11.0 ns
C
L
= 50 pF - 5.0 10.6 1.0 12.0 1.0 13.5 ns
t
dis
disable time OE to An; OE to Bn;
signal name DIR;
see
Figure 6
[4]
V
CC
= 3.0 V to 3.6 V
C
L
= 15 pF - 7.5 12.5 1.0 15.5 1.0 16.0 ns
C
L
= 50 pF - 10.0 15.8 1.0 18.0 1.0 20.0 ns
V
CC
= 4.5 V to 5.5 V
C
L
= 15 pF - 4.5 7.8 1.0 9.2 1.0 10.0 ns
C
L
= 50 pF - 6.0 9.7 1.0 11.0 1.0 12.5 ns
C
PD
power
dissipation
capacitance
f
i
= 1 MHz;
V
I
= GND to V
CC
[5]
-12- - - - -pF
74AHCT245; V
CC
= 4.5 V to 5.5 V
t
pd
propagation
delay
An to Bn; Bn to An;
see
Figure 5
[2]
C
L
= 15 pF - 3.5 7.7 1.0 8.5 1.0 10.0 ns
C
L
= 50 pF - 4.5 8.7 1.0 9.5 1.0 11.0 ns
t
en
enable time OE to An; OE to Bn;
signal name DIR;
see
Figure 6
[3]
C
L
= 15 pF - 5.0 13.8 1.0 15.0 1.0 17.5 ns
C
L
= 50 pF - 6.0 14.8 1.0 16.0 1.0 18.5 ns