參數(shù)資料
型號： 74HC_HCT245_CNV_2
廠商： NXP Semiconductors N.V.
英文描述： Octal bus transceiver; 3-state
中文描述： 8個三態(tài)總線收發(fā)器, 3態(tài)
文件頁數(shù)： 4/22頁
文件大小： 130K
代理商： 74HC_HCT245_CNV_2
9397 750 14502
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 03 — 31 January 2005
12 of 22
Philips Semiconductors
74HC245; 74HCT245
Octal bus tranceiver; 3-state
[1]
CPD is used to determine the dynamic power dissipation (PD in W):
PD =CPD × VCC2 × fi × N+ ∑ (CL × VCC2 × fo) where:
fi = input frequency in MHz;
fo = output frequency in MHz;
CL = output load capacitance in pF;
VCC = supply voltage in V;
N = number of inputs switching;
∑ (C
L × VCC
2
× f
o) = sum of outputs.
Table 10:
Dynamic characteristics type 74HCT245
GND = 0 V; test circuit see Figure 7.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
Tamb = 25 °C
tPHL, tPLH
propagation delay An to Bn or Bn
to An
VCC = 4.5 V
-
12
22
ns
VCC = 5.0 V; CL =15pF
-
10
-
ns
tPZH, tPZL
3-state output enable time OE to
An or OE to Bn
VCC = 4.5 V; see Figure 6
-
1630ns
tPHZ, tPLZ
3-state output disable time OE to
An or OE to Bn
VCC = 4.5 V; see Figure 6
-
1630ns
tTHL, tTLH
output transition time
VCC = 4.5 V; see Figure 5
-
5
12
ns
CPD
power dissipation capacitance
per transceiver
VI = GND to VCC 1.5 V
[1] -30
-
pF
Tamb = 40 °C to +85 °C
tPHL, tPLH
propagation delay An to Bn or Bn
to An
VCC = 4.5 V; see Figure 5
--28
ns
tPZH, tPZL
3-state output enable time OE to
An or OE to Bn
VCC = 4.5 V; see Figure 6
--38
ns
tPHZ, tPLZ
3-state output disable time OE to
An or OE to Bn
VCC = 4.5 V; see Figure 6
--38
ns
tTHL, tTLH
output transition time
VCC = 4.5 V; see Figure 5
--15
ns
Tamb = 40 °C to +125 °C
tPHL, tPLH
propagation delay An to Bn or Bn
to An
VCC = 4.5 V; see Figure 5
--33
ns
tPZH, tPZL
3-state output enable time OE to
An or OE to Bn
VCC = 4.5 V; see Figure 6
--45
ns
tPHZ, tPLZ
3-state output disable time OE to
An or OE to Bn
VCC = 4.5 V; see Figure 6
--45
ns
tTHL, tTLH
output transition time
VCC = 4.5 V; see Figure 5
--18
ns
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