74LVC244ABQ(2009) 查看數據表（PDF） - NXP Semiconductors.
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74LVC244ABQ Datasheet PDF : 18 Pages
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NXP Semiconductors
74LVC244A; 74LVCH244A
Octal buffer/line driver; 3-state
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
Min Typ[1] Max
CI
input capacitance
IBHL
bus hold LOW VCC = 3.0 V; VI = 0.8 V
current
-
[4][5]
75
4.0
-
-
-
IBHH
bus hold HIGH VCC = 3.0 V; VI = 2.0 V
current
[4][5]
−75
-
-
IBHLO
bus hold LOW VCC = 3.6 V
overdrive current
[4][6]
500
-
-
IBHHO
bus hold HIGH VCC = 3.6 V
overdrive current
[4][6] −500
-
-
−40 °C to +125 °C Unit
Min
Max
-
- pF
60
- µA
−60
- µA
500
- µA
−500
- µA
[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
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
Min Typ[2] Max
tpd
propagation nAn to nYn; see Figure 6
delay
VCC = 1.2 V
[1]
-
17.0
-
VCC = 2.7 V
VCC = 3.0 V to 3.6 V
ten
enable time nOE to nYn; see Figure 7
1.5 3.3 6.9
[3] 1.5 2.8 5.9
[1]
VCC = 1.2 V
-
24.0
-
VCC = 2.7 V
VCC = 3.0 V to 3.6 V
tdis
disable time nOE to nYn; see Figure 7
1.5 3.3 8.6
[3] 1.0 3.4 7.6
[1]
VCC = 1.2 V
-
9.0
-
tsk(o)
output skew
time
VCC = 2.7 V
VCC = 3.0 V to 3.6 V
1.5 3.2 6.8
[3] 1.5 2.9 5.8
[4]
-
-
1.0
−40 °C to +125 °C Unit
Min
Max
-
- ns
1.5
9.0 ns
1.5
7.5 ns
-
- ns
1.5
11 ns
1.0
9.5 ns
-
- ns
1.5
8.5 ns
1.5
7.5 ns
-
1.5 ns
74LVC_LVCH244A_6
Product data sheet
Rev. 06 — 13 August 2009
© NXP B.V. 2009. All rights reserved.
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