LPC2103 datasheet(29/37 Pages) NXP

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LPC2101_02_03_4

Product data sheet

Rev. 04 — 2 June 2009

29 of 37

NXP Semiconductors

LPC2101/02/03

Single-chip 16-bit/32-bit microcontrollers

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 Cb 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

Ci = 100 pF. To limit the input voltage to the speciﬁed range, choose an additional

capacitor to ground Cg which attenuates the input voltage by a factor Ci/(Ci +Cg). 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

Tamb =0 °Cto70 °C for commercial applications, −40 °C to +85 °C for industrial applications, VDD(1V8), VDD(3V3) over

speciﬁed ranges[1].

Symbol

Parameter

Conditions

Min

Typ[2]

Max

Unit

External clock

fosc

oscillator frequency

MHz

Tcy(clk)

clock cycle time

100

tCHCX

clock HIGH time

Tcy(clk) × 0.4

tCLCX

clock LOW time

Tcy(clk) × 0.4

tCLCH

clock rise time

tCHCL

clock fall time

Port pins (except P0.2 and P0.3)

tr(o)

output rise time

tf(o)

output fall time

I2C-bus pins (P0.2 and P0.3)

tf(o)

output fall time

VIH to VIL

20 + 0.1

× Cb[3] --ns

Fig 9.

Slave mode operation of the on-chip oscillator

LPC2xxx

XTAL1

100 pF

002aae718

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