LPC2292 datasheet(32/40 Pages) PHILIPS

32 / 40 page

Philips Semiconductors

LPC2292/LPC2294

16/32-bit ARM microcontrollers with external memory interface

Preliminary data

Rev. 01 — 05 February 2004

32 of 40

9397 750 12748

Dynamic characteristics

[1]

Parameters are valid over operating temperature range unless otherwise speciﬁed.

[2]

Bus capacitance Cb in pF, from 10 pF to 400 pF.

Table 12:

Characteristics

Tamb =0 °Cto +70 °C for commercial, −40 °C to +85 °C for industrial, V18, V3 over speciﬁed ranges[1]

Symbol

Parameter

Conditions

Min

Typ[1]

Max

Unit

External Clock

fosc

Oscillator frequency supplied by an

external oscillator (signal generator)

MHz

External clock frequency supplied by

an external crystal oscillator

MHz

External clock frequency if on-chip

PLL is used

MHz

External clock frequency if ISP is

used for initial code download

MHz

External oscillator clock period

1000

tCHCX

Clock high time

tc × 0.4

tCLCX

Clock low time

tc × 0.4

tCLCH

Clock rise time

tCHCL

Clock fall time

Port Pins

tRISE

Port output rise time (except P0.2,

P0.3)

-10

tFALL

Port output fall time (except P0.2,

P0.3)

-10

I2C pins

Output fall time from VIH to VIL

20 +

0.1

× Cb[2]

--ns

Table 13:

External memory interface AC characteristics. CL =25pF. Tamb =40 °C

Symbol

Description

Min

Max

Unit

Common to Read and Write Cycles

tCHAVR

XCLK HIGH to Address Valid

tCHCSL

XCLK HIGH to CS LOW

tCHCSH

XCLK HIGH to CS HIGH

tCHANV

XCLK HIGH to Address Invalid

Read Cycle Parameters

tCSLAV

CS LOW to Address Valid

−5[1]

tOELAVR

OE LOW to Address Valid

−5[1]

tCSLOEL

CS LOW to OE LOW

−55

tAVDV

Memory Access Time (latest of Address

Valid, CS LOW, OE LOW to Data Valid)

(tCYC*(2 + WST1)) + (−20) -

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