Datasheet

LPC540xx All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2018. All rights reserved.
Product data sheet Rev. 1.8 — 22 June 2018 102 of 168
NXP Semiconductors
LPC540xx
32-bit ARM Cortex-M4 microcontroller
11. Dynamic characteristics
11.1 I/O pins
[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] C
L
= 20 pF. Rise and fall times measured between 90 % and 10 % of the full input signal level.
Table 21. Dynamic characteristic: I/O pins
[1]
T
amb
=  40  C to +105  C; 1.71 V  V
DD
 3.6 V
Symbol Parameter Conditions Min Typ Max Unit
Standard I/O pins - normal drive strength
t
r
rise time pin configured as output; SLEW = 1
(Fast-mode);
2.7 V  V
DD
<= 3.6 V
[2][3]
1.0 - 2.5 ns
1.71 V  V
DD
<= 1.98 V 1.6 - 3.8 ns
t
f
fall time pin configured as output; SLEW = 1
(Fast-mode);
2.7 V  V
DD
<= 3.6 V
[2][3]
0.9 - 2.5 ns
1.71 V  V
DD
<= 1.98 V 1.7 - 4.1 ns
t
r
rise time pin configured as output; SLEW = 0 (standard
mode);
2.7 V  V
DD
3.6 V
[2][3]
1.9 - 4.3 ns
1.71 V  V
DD
 1.98 V 2.9 - 7.8 ns
t
f
fall time pin configured as output; SLEW = 0 (standard
mode);
2.7 V  V
DD
 3.6 V
[2][3]
1.9 - 4.0 ns
1.71 V  V
DD
 1.98 V 2.7 - 6.7 ns
t
r
rise time pin configured as input
[4]
0.3 - 1.3 ns
t
f
fall time pin configured as input
[4]
0.2 - 1.2 ns