TL16C552A, TL16C552AM
DUAL ASYNCHRONOUS COMMUNICATIONS ELEMENT
WITH FIFO
SLLS189D – NOVEMBER 1994 – REVISED JANUARY 1999
PN PACKAGE
(TOP VIEW)
80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61
NC
NC
RXRDY1
SIN1
NC
1
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
ENIRQ
TXRDY1
SIN0
2
3
4
ERR
V
5
DD
V
RESET
CS2
IOR
IOW
A0
6
DD
SLCT
BUSY
PE
ACK
PEMD
TRI
7
8
9
10
11
12
13
14
15
16
17
18
19
20
A1
A2
CS1
CLK
CS0
DSR0
RI0
DCD0
CTS0
GND
NC
DSR1
RI1
GND
DCD1
RXRDY0
NC
NC
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
description
The TL16C552A is an enhanced dual-channel version of the popular TL16C550B asynchronous
communications element (ACE). The device serves two serial input/output interfaces simultaneously in
microcomputer or microprocessor-based systems. Each channel performs serial-to-parallel conversion on data
characters received from peripheral devices or modems and parallel-to-serial conversion on data characters
transmitted by the CPU. The complete status of each channel of the dual ACE can be read at any time during
functional operation by the CPU. The information obtained includes the type and condition of the transfer
operations being performed and the error conditions encountered.
In addition to its dual communications interface capabilities, the TL16C552A provides the user with a
bidirectional parallel data port that fully supports the parallel Centronics-type printer interface. The parallel port
and the two serial ports provide IBM PC/AT-compatible computers with a single device to serve the three system
ports. A programmable baud rate generator that can divide the timing reference clock input by a divisor between
16
1 and (2 – 1) is included.
The TL16C552A is available in a 68-pin plastic-leaded chip-carrier (FN) package and a 80-pin TQFP (PN)
package. The TL16C552AM is available in a 68-pin ceramic quad flat (HV) package.
2
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