TL16C450

ASYNCHRONOUS COMMUNICATIONS ELEMENT

SLLS037C − MARCH 1988 − REVISED JANUARY 2006

5

POST OFFICE BOX 655303

Terminal Functions (continued)

TERMINAL

I/O

DESCRIPTION

NAME

NO.†

I/O

DESCRIPTION

OUT1

OUT2

38

35

O

Outputs 1 and 2. OUT1 and OUT2 are user-designated output terminals that are set to their active states by

setting their respective modem control register bits (OUT1 and OUT2) high. OUT1 and OUT2 are set to their

inactive (high) states as a result of master reset or during loop mode operations or by clearing bit 2 (OUT1) or

bit 3 (OUT2) of the MCR.

RCLK

10

I

Receiver clock. RCLK is the 16

× baud rate clock for the receiver section of the ACE.

RI

43

I

Ring indicator. RI is a modem status signal. Its condition can be checked by reading bit 6 (RI) of the modem status

register. Bit 2 (TERI) of the modem status register indicates that the RI input has transitioned from a low to a high

state since the last read from the modem status register. If the modem status interrupt is enabled when this

transition occurs, an interrupt is generated.

RTS

36

O

Request to send. When active, RTS informs the modem or data set that the ACE is ready to transmit data. RTS

is set to its active state by setting the RTS modem control register bit and is set to its inactive (high) state either

as a result of a master reset or during loop mode operations or by clearing bit 1 (RTS) of the MCR.

SIN

11

I

Serial input. SIN is the serial data input from a connected communications device.

SOUT

13

O

Serial output. SOUT is the composite serial data output to a connected communication device. SOUT is set to

the marking (set) state as a result of MR.

VCC

44

5-V supply voltage

VSS

22

Supply common

XTAL1

XTAL2

18

19

I/O

External clock. XTAL1 and XTAL2 connect the ACE to the main timing reference (clock or crystal).

† Terminal numbers shown are for the FN package.

−0.5 V to 7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

−0.5 V to 7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

−0.5 V to 7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous total power dissipation at (or below) 70

°C free-air temperature: FN package

1100 mW

. . . . . . .

800 mW

. . . . . . . .

0

°C to 70°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

−65

°C to 150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

260

°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

260

°C

. . . . . . . . . . . . . . . . . . . .

† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

‡ The N package in Not Recommended for New Designs.

NOTE 1: All voltage values are with respect to VSS.

recommended operating conditions

MIN

NOM

MAX

UNIT

Supply voltage, VCC

4.75

5

5.25

V

High-level input voltage, VIH

2

VCC

V

Low-level input voltage, VIL

− 0.5

0.8

V

Operating free-air temperature, TA

0

70

°C