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.