LPC540xx
NXP Semiconductors
32-bit ARM Cortex-M4 microcontroller
11. Dynamic characteristics
11.1 I/O pins
Table 21. Dynamic characteristic: I/O pins[1]
Tamb = 40 C to +105 C; 1.71 V VDD 3.6 V
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
Standard I/O pins - normal drive strength
[2][3]
[2][3]
[2][3]
[2][3]
tr
tf
tr
tf
rise time
fall time
rise time
fall time
pin configured as output; SLEW = 1
(Fast-mode);
2.7 V VDD <= 3.6 V
1.0
1.6
-
-
2.5
3.8
ns
ns
1.71 V VDD <= 1.98 V
pin configured as output; SLEW = 1
(Fast-mode);
2.7 V VDD <= 3.6 V
0.9
1.7
-
-
2.5
4.1
ns
ns
1.71 V VDD <= 1.98 V
pin configured as output; SLEW = 0 (standard
mode);
2.7 V VDD 3.6 V
1.9
2.9
-
-
4.3
7.8
ns
ns
1.71 V VDD 1.98 V
pin configured as output; SLEW = 0 (standard
mode);
2.7 V VDD 3.6 V
1.71 V VDD 1.98 V
pin configured as input
pin configured as input
1.9
2.7
0.3
0.2
-
-
-
-
4.0
6.7
1.3
1.2
ns
ns
ns
ns
[4]
[4]
tr
tf
rise time
fall time
[1] Simulated data, not tested in production.
[2] Simulated using 10 cm of 50 Ω PCB trace with 5 pF receiver input. Rise and fall times measured between
80 % and 20 % of the full output signal level.
[3] The slew rate is configured in the IOCON block the SLEW bit.
[4] CL = 20 pF. Rise and fall times measured between 90 % and 10 % of the full input signal level.
LPC540xx
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© NXP Semiconductors N.V. 2018. All rights reserved.
Product data sheet
Rev. 1.8 — 22 June 2018
102 of 168
NXP [ NXP ]
