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© Koninklijke Philips Electronics N.V. 2005. All rights reserved.

Preliminary data sheet

Rev. 01 — 3 October 2005

31 of 38

Philips Semiconductors

LPC2141/42/44/46/48

Single-chip 16-bit/32-bit microcontrollers

9.

Dynamic characteristics

[1]

Characterized but not implemented as production test. Guaranteed by design.

[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]

Table 7:

Dynamic characteristics of USB pins (full-speed)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

rise time

10 % to 90 %

4

-

20

ns

fall time

10 % to 90 %

4

-

20

ns

differential rise and fall time

matching

90

-

110

%

output signal crossover voltage

1.3

-

2.0

V

source SE0 interval of EOP

see Figure 9

160

-

175

ns

source jitter for differential transition

to SE0 transition

see Figure 9

−2

-

+5

ns

receiver jitter to next transition

−18.5

-

+18.5

ns

receiver jitter for paired transitions

10 % to 90 %

−9

-

+9

ns

EOP width at receiver [1]

must reject as

EOP; see

Figure 9

40

--ns

EOP width at receiver [1]

must accept as

EOP; see

Figure 9

82

--ns

Table 8:

Dynamic characteristics

Symbol

Parameter

Conditions

Min

Typ [2]

Max

Unit

External clock

oscillator frequency

10

-

25

MHz

clock cycle time

40

-

100

ns

clock HIGH time

-

-

ns

clock LOW time

-

-

ns

clock rise time

-

-

5

ns

clock fall time

-

-

5

ns

Port pins (P0.2, P0.3, P0.11, and P0.14)

output rise time

-

10

-

ns

output fall time

-

10

-

ns

output fall time

20 + 0.1