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74AHC273 Datasheet PDF : 18 Pages
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NXP Semiconductors
74AHC273; 74AHCT273
Octal D-type flip-flop with reset; positive-edge trigger
Table 7. Dynamic characteristics …continued
Voltages are referenced to GND (ground = 0 V); for test circuit see Figure 10.
Symbol Parameter Conditions
25 °C
−40 °C to +85 °C −40 °C to +125 °C Unit
Min Typ[1] Max Min Max Min
Max
trec
recovery MR to CP; see Figure 8
time
VCC = 3.0 V to 3.6 V
2.5 -
- 2.5
-
2.5
VCC = 4.5 V to 5.5 V
2.0 -
- 2.0
-
2.0
CPD
power
fi = 1 MHz; VI = GND to VCC [4] -
14
-
-
-
-
dissipation
capacitance
-
ns
-
ns
-
pF
74AHCT273; VCC = 4.5 V to 5.5 V
tpd
propagation CP to Qn; see Figure 7
delay
CL = 15 pF
CL = 50 pF
MR to Qn; see Figure 8
[2]
- 4.0 7.5 1.0
8.8
1.0
- 5.8 9.2 1.0 10.5 1.0
[3]
9.5 ns
11.5 ns
CL = 15 pF
CL = 50 pF
fmax
maximum see Figure 7
frequency
CL = 15 pF
CL = 50 pF
tW
pulse width CP HIGH or LOW;
see Figure 7
- 3.9 10.0 1.0 11.6 1.0
- 5.6 11.0 1.0 12.6 1.0
75 120 - 65
-
65
50 75 - 45
-
45
5.0 -
- 6.5
-
6.5
12.5 ns
14.0 ns
-
MHz
-
MHz
-
ns
MR LOW; see Figure 8
5.0 -
- 6.0
-
6.0
-
ns
tsu
set-up time Dn to CP; see Figure 9
th
hold time Dn to CP; see Figure 9
trec
recovery MR to CP; see Figure 8
time
3.0 -
- 3.0
-
3.0
1.0 -
- 1.0
-
1.0
2.5 -
- 2.5
-
2.5
-
ns
-
ns
-
ns
CPD
power
fi = 1 MHz; VI = GND to VCC [4] -
18
-
-
-
-
dissipation
capacitance
-
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.
[3] tpd is the same as tPHL only.
[4] CPD is used to determine the dynamic power dissipation (PD in µW).
PD = CPD × VCC2 × fi × N + Σ(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;
Σ(CL × VCC2 × fo) = sum of the outputs.
74AHC_AHCT273_3
Product data sheet
Rev. 03 — 13 May 2008
© NXP B.V. 2008. All rights reserved.
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