74HC_HCT245_15 Datasheet, PDF (12/22 Pages) NXP Semiconductors – Octal bus tranceiver; 3-state

Philips Semiconductors
74HC245; 74HCT245
Octal bus tranceiver; 3-state
Table 10: Dynamic characteristics type 74HCT245
GND = 0 V; test circuit see Figure 7.
Symbol Parameter
Conditions
T_amb = 25 °C
t_PHL, t_PLH propagation delay An to Bn or Bn
to An
t_PZH, t_PZL 3-state output enable time OE to
An or OE to Bn
see Figure 5
V_CC = 4.5 V
V_CC = 5.0 V; C_L = 15 pF
V_CC = 4.5 V; see Figure 6
t_PHZ, t_PLZ 3-state output disable time OE to V_CC = 4.5 V; see Figure 6
An or OE to Bn
t_THL, t_TLH
C_PD
output transition time
power dissipation capacitance
per transceiver
V_CC = 4.5 V; see Figure 5
V_I = GND to V_CC − 1.5 V
T_amb = −40 °C to +85 °C
t_PHL, t_PLH propagation delay An to Bn or Bn V_CC = 4.5 V; see Figure 5
to An
t_PZH, t_PZL 3-state output enable time OE to V_CC = 4.5 V; see Figure 6
An or OE to Bn
t_PHZ, t_PLZ 3-state output disable time OE to V_CC = 4.5 V; see Figure 6
An or OE to Bn
t_THL, t_TLH output transition time
T_amb = −40 °C to +125 °C
t_PHL, t_PLH propagation delay An to Bn or Bn
to An
V_CC = 4.5 V; see Figure 5
V_CC = 4.5 V; see Figure 5
t_PZH, t_PZL 3-state output enable time OE to V_CC = 4.5 V; see Figure 6
An or OE to Bn
t_PHZ, t_PLZ 3-state output disable time OE to V_CC = 4.5 V; see Figure 6
An or OE to Bn
t_THL, t_TLH output transition time
V_CC = 4.5 V; see Figure 5
[1] C_PD is used to determine the dynamic power dissipation (P_D in µW):
P_D = C_PD × V_CC2 × f_i × N + ∑ (C_L × V_CC2 × 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_CC2 × f_o) = sum of outputs.
Min
Typ
Max Unit
-
12
22
ns
-
10
-
ns
-
16
30
ns
-
16
30
ns
-
5
12
ns
[1] _-
30
-
pF
-
-
28
ns
-
-
38
ns
-
-
38
ns
-
-
15
ns
-
-
33
ns
-
-
45
ns
-
-
45
ns
-
-
18
ns
9397 750 14502
Product data sheet
Rev. 03 — 31 January 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
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