LPC2921 datasheet(63/81 Pages) PHILIPS

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LPC2921_2923_2925_0

Preliminary data sheet

Rev. 00.01 — 24 October 2008

63 of 81

NXP Semiconductors

LPC2921/2923/2925

ARM9 microcontroller with CAN and LIN

Dynamic characteristics

9.1 Dynamic characteristics: I/O pins, internal clock, oscillators, PLL, and

CAN

[1]

All parameters are guaranteed over the virtual junction temperature range by design. Pre-testing is performed at Tamb =125 °C ambient

temperature on wafer level. Cased products are tested at Tamb =25 °C (final testing). Both pre-testing and final testing use correlated

test conditions to cover the specified temperature and power supply voltage range.

[2]

See Table 24.

[3]

This parameter is not part of production testing or final testing, hence only a typical value is stated.

[4]

Oscillator start-up time depends on the quality of the crystal. For most crystals it takes about 1000 clock pulses until the clock is fully

stable.

Table 32.

Dynamic characteristics

VDD(CORE) =VDD(OSC_PLL); VDD(IO) = 2.7 V to 3.6 V; VDDA(ADC3V3) = 3.0 V to 3.6 V; all voltages are measured with respect to

ground; positive currents flow into the IC; unless otherwise specified.[1]

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

I/O pins

tTHL

HIGH-to-LOW

transition time

CL = 30 pF

13.8

tTLH

LOW-to-HIGH

transition time

CL = 30 pF

13.8

Internal clock

fclk(sys)

system clock frequency

[2] 10

125

MHz

Tclk(sys)

system clock period

[2] 8

100

Low-power ring oscillator

fref(RO)

RO reference

frequency

0.36

0.4

0.42

MHz

tstartup

start-up time

at maximum frequency

[3] -6

μs

Oscillator

fi(osc)

oscillator input

frequency

maximum frequency is

the clock input of an

external clock source

applied to the Xin pin

100

MHz

tstartup

start-up time

at maximum frequency

[3]

[4]

-500

μs

PLL

fi(PLL)

PLL input frequency

MHz

fo(PLL)

PLL output frequency

160

MHz

CCO; direct mode

156

320

MHz

ta(clk)

clock access time

63.4

ta(A)

address access time

60.3

Jitter specification for CAN

tjit(cc)(p-p)

cycle to cycle jitter

(peak-to-peak value)

on CAN TXDC pin

[3] -0.4

LPC2921 Datasheet(PDF) 63 Page - NXP Semiconductors

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