74AHCT240BQ 查看數據表（PDF） - NXP Semiconductors.
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74AHCT240BQ Datasheet PDF : 16 Pages
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NXP Semiconductors
74AHC240; 74AHCT240
Octal buffer/line driver; inverting; 3-state
Table 7. Dynamic characteristics …continued
Voltages are referenced to GND (ground = 0 V); for test circuit see Figure 7.
Symbol Parameter
Conditions
25 C
Min Typ[1] Max
74AHCT240
tpd
propagation delay nAn to nYn; see Figure 5
[2]
VCC = 4.5 V to 5.5 V; CL = 15 pF
-
ten
enable time
VCC = 4.5 V to 5.5 V; CL = 50 pF
-
nOE to nYn; see Figure 6
[2]
VCC = 4.5 V to 5.5 V; CL = 15 pF
-
tdis
disable time
VCC = 4.5 V to 5.5 V; CL = 50 pF
-
nOE to nYn; see Figure 6
[2]
VCC = 4.5 V to 5.5 V; CL = 15 pF
-
VCC = 4.5 V to 5.5 V; CL = 50 pF
-
CPD
power dissipation VI = GND to VCC; CL = 50 pF;
[3] -
capacitance
fi = 1 MHz
3.0 5.8
4.4 8.4
3.4 7.5
4.5 9.5
3.9 6.1
6.2 8.7
9
-
40 C to +125 C Unit
Min Max Max
(85 C) (125 C)
1.0 6.8
1.0 9.5
8.5 ns
11.9 ns
1.0 9.0
1.0 11.5
14.4 ns
14.4 ns
1.0 6.7
1.0 9.2
-
-
8.3 ns
11.5 ns
- pF
[1] Typical values are measured at nominal supply voltage (VCC = 3.3 V and VCC = 5.0 V).
[2] tpd is the same as tPLH and tPHL; ten is the same as tPZH and tPZL; tdis is the same as tPLZ and tPHZ.
[3] 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;
(CL VCC2 fo) = sum of outputs.
11. Waveforms
VI
nAn input
GND
VOH
nYn output
VOL
VM
tPHL
VM
VM
tPLH
VM
mgu781
Fig 5.
Measurement points are given in Table 8.
VOL and VOH are typical voltage output drop that occur with the output load.
Propagation delay input (nAn) to output (nYn)
74AHC_AHCT240
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 26 November 2010
© NXP B.V. 2010. All rights reserved.
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