IBM PC/ATE Compatible
Two TL16C550 ACEs
Enhanced Bidirectional Printer Port
16-Byte FIFOs Reduce CPU Interrupts
Up to 16-MHz Clock Rate for up to 1-Mbaud
Operation
Transmit, Receive, Line Status, and Data
Set Interrupts on Each Channel
Independently Controlled
Individual Modem Control Signals for Each
Channel
Programmable Serial Interface
Characteristics for Each Channel:
– 5-, 6-, 7-, or 8-Bit Characters
– Even, Odd, or No Parity Bit Generation
and Detection
– 1-, 1-1/2-, or 2-Stop Bit Generation
3-State Outputs Provide TTL Drive for the
Data and Control Bus on Each Channel
Hardware and Software Compatible With
TL16C452

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
1 and (216 – 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.