Datasheet

9397 750 14502 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 31 January 2005 11 of 22
Philips Semiconductors
74HC245; 74HCT245
Octal bus tranceiver; 3-state
[1] C
PD
is used to determine the dynamic power dissipation (P
D
in µW):
P
D
=C
PD
× V
CC
2
× f
i
× N+∑ (C
L
× V
CC
2
× f
o
) where:
f
i
= input frequency in MHz;
f
o
= output frequency in MHz;
C
L
= output load capacitance in pF;
V
CC
= supply voltage in V;
N = number of inputs switching;
∑ (C
L
× V
CC
2
× f
o
) = sum of outputs.
t
PZH
, t
PZL
3-state output enable time OE to
An or
OE to Bn
see
Figure 6
V
CC
= 2.0 V - - 190 ns
V
CC
= 4.5 V - - 38 ns
V
CC
= 6.0 V - - 33 ns
t
PHZ
, t
PLZ
3-state output disable time OE to
An or
OE to Bn
see
Figure 6
V
CC
= 2.0 V - - 190 ns
V
CC
= 4.5 V - - 38 ns
V
CC
= 6.0 V - - 33 ns
t
THL
, t
TLH
output transition time see Figure 5
V
CC
= 2.0 V - - 75 ns
V
CC
= 4.5 V - - 15 ns
V
CC
= 6.0 V - - 13 ns
T
amb
= −40 °C to +125 °C
t
PHL
, t
PLH
propagation delay An to Bn or Bn
to An
see Figure 5
V
CC
= 2.0 V - - 135 ns
V
CC
= 4.5 V - - 27 ns
V
CC
= 6.0 V - - 23 ns
t
PZH
, t
PZL
3-state output enable time OE to
An or
OE to Bn
see
Figure 6
V
CC
= 2.0 V - - 225 ns
V
CC
= 4.5 V - - 45 ns
V
CC
= 6.0 V - - 38 ns
t
PHZ
, t
PLZ
3-state output disable time OE to
An or
OE to Bn
see
Figure 6
V
CC
= 2.0 V - - 225 ns
V
CC
= 4.5 V - - 45 ns
V
CC
= 6.0 V - - 38 ns
t
THL
, t
TLH
output transition time see Figure 5
V
CC
= 2.0 V - - 90 ns
V
CC
= 4.5 V - - 18 ns
V
CC
= 6.0 V - - 15 ns
Table 9: Dynamic characteristics type 74HC245
…continued
GND = 0 V; test circuit see Figure 7.
Symbol Parameter Conditions Min Typ Max Unit