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74LVCH244APW 数据表(PDF) 7 Page - NXP Semiconductors

部件名 74LVCH244APW
功能描述  Octal buffer/line driver; 3-state
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制造商  NXP [NXP Semiconductors]
网页  http://www.nxp.com
标志 NXP - NXP Semiconductors

74LVCH244APW 数据表(HTML) 7 Page - NXP Semiconductors

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74LVC_LVCH244A_6
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 06 — 13 August 2009
7 of 18
NXP Semiconductors
74LVC244A; 74LVCH244A
Octal buffer/line driver; 3-state
[1]
All typical values are measured at VCC = 3.3 V (unless stated otherwise) and Tamb =25 °C.
[2]
The bus hold circuit is switched off when VI >VCC allowing 5.5 V on the input terminal.
[3]
For I/O ports the parameter IOZ includes the input leakage current.
[4]
Valid for data inputs of bus hold parts only (74LVCH244A). Note that control inputs do not have a bus hold circuit.
[5]
The specified sustaining current at the data input holds the input below the specified VI level.
[6]
The specified overdrive current at the data input forces the data input to the opposite input state.
10. Dynamic characteristics
CI
input capacitance
-
4.0
-
-
-
pF
IBHL
bus hold LOW
current
VCC = 3.0 V; VI = 0.8 V
[4][5]
75
-
-
60
-
µA
IBHH
bus hold HIGH
current
VCC = 3.0 V; VI = 2.0 V
[4][5]
−75
-
-
−60
-
µA
IBHLO
bus hold LOW
overdrive current
VCC = 3.6 V
[4][6]
500
-
-
500
-
µA
IBHHO
bus hold HIGH
overdrive current
VCC = 3.6 V
[4][6]
−500
-
-
−500
-
µA
Table 6.
Static characteristics …continued
At recommended operating conditions. Voltages are referenced to GND (ground = 0 V).
Symbol
Parameter
Conditions
−40 °C to +85 °C
−40 °C to +125 °C Unit
Min
Typ[1]
Max
Min
Max
Table 7.
Dynamic characteristics
Voltages are referenced to GND (ground = 0 V). For test circuit see Figure 8.
Symbol Parameter
Conditions
−40 °C to +85 °C
−40 °C to +125 °C Unit
Min
Typ[2]
Max
Min
Max
tpd
propagation
delay
nAn to nYn; see Figure 6
[1]
VCC = 1.2 V
-
17.0
-
-
-
ns
VCC = 2.7 V
1.5
3.3
6.9
1.5
9.0
ns
VCC = 3.0 V to 3.6 V
[3]
1.5
2.8
5.9
1.5
7.5
ns
ten
enable time
nOE to nYn; see Figure 7
[1]
VCC = 1.2 V
-
24.0
-
-
-
ns
VCC = 2.7 V
1.5
3.3
8.6
1.5
11
ns
VCC = 3.0 V to 3.6 V
[3]
1.0
3.4
7.6
1.0
9.5
ns
tdis
disable time
nOE to nYn; see Figure 7
[1]
VCC = 1.2 V
-
9.0
-
-
-
ns
VCC = 2.7 V
1.5
3.2
6.8
1.5
8.5
ns
VCC = 3.0 V to 3.6 V
[3]
1.5
2.9
5.8
1.5
7.5
ns
tsk(o)
output skew
time
[4]
-
-
1.0
-
1.5
ns


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