LPC2131_32_34_36_38 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 5.1 — 29 July 2011 29 of 45
NXP Semiconductors
LPC2131/32/34/36/38
Single-chip 16/32-bit microcontrollers
[4] V
DD
supply voltages must be present.
[5] 3-state outputs go into 3-state mode when V
DD
is grounded.
[6] Please also see the errata note mentioned in the errata sheet.
[7] Accounts for 100 mV voltage drop in all supply lines.
[8] Only allowed for a short time period.
[9] Minimum condition for V
I
= 4.5 V, maximum condition for V
I
=5.5V.
[10] Applies to P1.16 to P1.25.
[11] On pin VBAT.
[12] Optimized for low battery consumption.
[13] To V
SS
.
9. Dynamic characteristics
[1] Parameters are valid over operating temperature range unless otherwise specified.
[2] Typical ratings are not guaranteed. The values listed are at room temperature (25 C), nominal supply voltages.
[3] Bus capacitance C
b
in pF, from 10 pF to 400 pF.
Table 7. Dynamic characteristics
T
amb
=
40
C to +85
C for commercial applications, V
DD
over specified ranges.
[1]
Symbol Parameter Conditions Min Typ
[2]
Max Unit
External clock
f
osc
oscillator frequency 10 - 25 MHz
T
cy(clk)
clock cycle time 40 - 100 ns
t
CHCX
clock HIGH time T
cy(clk)
0.4 - - ns
t
CLCX
clock LOW time T
cy(clk)
0.4 - - ns
t
CLCH
clock rise time - - 5 ns
t
CHCL
clock fall time - - 5 ns
Port pins (except P0.2 and P0.3)
t
r(o)
output rise time - 10 - ns
t
f(o)
output fall time - 10 - ns
I
2
C-bus pins (P0.2 and P0.3)
t
f(o)
output fall time V
IH
to V
IL
20 + 0.1 C
b
[3]
--ns
