LPC1786 datasheet(86/117 Pages) NXP

86 / 117 page

LPC178X_7X

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Objective data sheet

Rev. 2 — 27 May 2011

86 of 117

NXP Semiconductors

LPC178x/7x

32-bit ARM Cortex-M3 microcontroller

11.3 External clock

[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.

11.4 Internal oscillators

[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.

Table 19.

Dynamic characteristic: external clock

Tamb = 40 C to +85 C; VDD(3V3) over specified ranges.[1]

Symbol

Parameter

Conditions

Min

Typ[2]

Max

Unit

fosc

oscillator frequency

MHz

Tcy(clk)

clock cycle time

1000

tCHCX

clock HIGH time

Tcy(clk)  0.4

--ns

tCLCX

clock LOW time

Tcy(clk)  0.4

--ns

tCLCH

clock rise time

tCHCL

clock fall time

Fig 20. External clock timing (with an amplitude of at least Vi(RMS) = 200 mV)

tCHCL

tCLCX

tCHCX

Tcy(clk)

tCLCH

002aaa907

Table 20.

Dynamic characteristic: internal oscillators

Tamb = 40 C to +85 C; 2.7 V  VDD(3V3)  3.6 V.[1]

Symbol

Parameter

Conditions

Min

Typ[2]

Max

Unit

fosc(RC)

internal RC oscillator

frequency

11.88

12.12

MHz

fi(RTC)

RTC input frequency

32.768 -

kHz

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