SC16C554 datasheet(38/55 Pages) PHILIPS

38 / 55 page

Philips Semiconductors

SC16C554/554D

Quad UART with 16-byte FIFO and infrared (IrDA) encoder/decoder

Product data

Rev. 05 — 10 May 2004

38 of 55

9397 750 13132

[1]

Applies to external clock, crystal oscillator max 24 MHz.

[2]

= 333 ns (for Baudratemax = 1.5 Mbit/s)

= 1

µs (for Baudratemax = 460.8 kbit/s)

= 4

µs (for Baudrate

max = 115.2 kbit/s)

[3]

When in both DMA mode 0 and FIFO enable mode, the write cycle delay should be larger than one x1, clock cycle.

10.1 Timing diagrams

t32d

write cycle delay

[3]

t33s

data set-up time

t33h

data hold time

tRESET

Reset pulse width

200

baud rate divisor

216

− 11

216

− 11

216

− 1R

clk

Table 27:

AC electrical characteristics…continued

Tamb = −40 °C to +85 °C; VCC = 2.5 V, 3.3 V or 5.0 V ± 10%, unless otherwise speciﬁed.

Symbol

Parameter

Conditions

2.5 V

3.3 V

5.0 V

Unit

Min

Max

Min

Max

Min

Max

IOWstrobemax

2 Baudrate

max

()

--------------------------------------

Fig 10. General read timing in 68 mode.

002aaa210

t30s

t31h

A0–A4

R/W

D0–D7

t31d

t30w

t30d

t30h

t32s

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