LPC2101_02_03_4 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 04 — 2 June 2009 29 of 37
NXP Semiconductors
LPC2101/02/03
Single-chip 16-bit/32-bit microcontrollers
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.
10. Application information
10.1 XTAL1 input
The input voltage to the on-chip oscillators is limited to 1.8 V. If the oscillator is driven by a
clock in slave mode, it is recommended that the input be coupled through a capacitor with
C
i
= 100 pF. To limit the input voltage to the specified range, choose an additional
capacitor to ground C
g
which attenuates the input voltage by a factor C
i
/(C
i
+C
g
). In slave
mode, a minimum of 200 mV (RMS) is needed. For more details see the
LPC2101/02/03
User manual UM10161
.
Table 7. Dynamic characteristics
T
amb
=0
°
Cto70
°
C for commercial applications,
−
40
°
C to +85
°
C for industrial applications, V
DD(1V8)
, V
DD(3V3)
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
Fig 9. Slave mode operation of the on-chip oscillator
LPC2xxx
XTAL1
C
i
100 pF
C
g
002aae718
