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74LVC4245A_2 Datasheet PDF : 17 Pages
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NXP Semiconductors
74LVC4245A
Octal dual supply translating transceiver; 3-state
Table 7. Dynamic characteristics …continued
Voltages are referenced to GND (ground = 0 V). VCCA = 4.5 V to 5.5 V; tr = tf ≤ 2.5 ns. For test circuit see Figure 8.
Symbol Parameter
Conditions
VCCB
−40 °C to +85 °C
−40 °C to +125 °C Unit
Min Typ[1] Max
Min
Max
tsk(o)
output skew
time
[2]
-
-
1.0
-
1.5 ns
CPD
power
5 V port: Bn to An;
dissipation
VI = GND to VCCA;
capacitance VCCA = 5.0 V
outputs enabled -
[3]
-
17
-
-
- pF
outputs disabled -
-
5
-
-
- pF
3 V port: An to Bn;
VI = GND to VCCB;
VCCB = 3.3 V
outputs enabled -
[3]
-
17
-
-
- pF
outputs disabled -
-
5
-
-
- pF
[1] Typical values are measured at Tamb = 25 °C, VCCA = 5.0 V, and VCCB = 2.7 V and 3.3 V respectively.
[2] Skew between any two outputs of the same package switching in the same direction. This parameter is guaranteed by design.
[3] 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 Volts
N = number of inputs switching
Σ(CL × VCC2 × fo) = sum of the outputs
11. AC waveforms
3.9
VCCB
(V) 3.6
VCCA ≥ VCCB
mna454
3.3
3.0
2.7
2.4
2.1
1.8
1.5
1.2
0.9
1.5 2.1 2.7
Full operation
3.3 3.9 4.5 5.1 5.7
VCCA (V)
Complies with TTL levels
Fig 5. Supply operation area
74LVC4245A_6
Product data sheet
Rev. 06 — 18 January 2008
© NXP B.V. 2008. All rights reserved.
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