sc16c554dbib64 NXP Semiconductors, sc16c554dbib64 Datasheet - Page 14

• Manufacturer Part Number: sc16c554dbib64
• Description: 5 V, 3.3 V And 2.5 V Quad Uart, 5 Mbit/s Max. With 16-byte Fifos
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 2:
SC16C554B_554DB_3
Product data sheet
Symbol
TXA
TXB
TXC
TXD
TXRDY
V
XTAL1
XTAL2
CC
Pin description
Pin
PLCC68 LQFP64 LQFP80 HVQFN48
17
19
51
53
39
13, 30,
47, 64
35
36
8
10
39
41
-
4, 21,
35, 52
25
26
…continued
29
32
69
72
55
5, 25,
45, 65
50
51
5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs
6
8
32
34
-
2, 28
18
19
Rev. 03 — 1 September 2005
Type
O
O
I
I
O
Description
Transmit data A, B, C, D. These outputs are
associated with individual serial transmit channel data
from the SC16C554B/554DB. The TX signal will be a
logic 1 during reset, idle (no data), or when the
transmitter is disabled. During the local loop-back
mode, the TX output pin is disabled and TX data is
internally connected to the UART RX input.
Transmit Ready (active LOW). TXRDY contains the
wire-ORed status of all four transmit channel FIFOs,
TXRDYA to TXRDYD. A logic 0 indicates a buffer ready
status, that is, at least one location is empty and
available in one of the TX channels (A to D). This pin
goes to a logic 1 when all four channels have no more
empty locations in the TX FIFO or THR. Individual
channel TX status can be read by examining individual
internal registers via CS and A0 to A4 pin functions.
The TXRDY pin is not available on the HVQFN48
package.
Power supply inputs.
Crystal or external clock input. Functions as a crystal
input or as an external clock input. A crystal can be
connected between this pin and XTAL2 to form an
internal oscillator circuit (see
an external clock can be connected to this pin to
provide custom data rates. (See
“Programmable baud rate
Output of the crystal oscillator or buffered clock.
(See also XTAL1.) Crystal oscillator output or buffered
clock output.
SC16C554B/554DB
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
generator”.)
Figure
Section 6.6
13). Alternatively,
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