Datasheet

LPC2194_4 © Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet Rev. 04 — 11 September 2006 30 of 36
Philips Semiconductors
LPC2194
Single-chip 16/32-bit microcontroller
9. Dynamic characteristics
[1] Parameters are valid over operating temperature range unless otherwise specified.
[2] Bus capacitance C
b
in pF, from 10 pF to 400 pF.
Table 11. Dynamic characteristics
T
amb
= − 40 ° C to +125 ° C for industrial applications; V
DD(1V8)
, V
DD(3V3)
over specified ranges
[1]
Symbol Parameter Conditions Min Typ Max Unit
External clock
f
osc
oscillator frequency supplied by an external
oscillator (signal generator)
1-50MHz
external clock frequency
supplied by an external
crystal oscillator
1-30MHz
external clock frequency if
on-chip PLL is used
10 - 25 MHz
external clock frequency if
on-chip bootloader is used
for initial code download
10 - 25 MHz
T
cy(clk)
clock cycle time 20 - 1000 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
rise time - 10 - ns
t
f
fall time - 10 - ns
I
2
C-bus pins (P0.2 and P0.3)
t
f
fall time V
IH
to V
IL
[2]
20 + 0.1 × C
b
--ns