TL16C554A, TL16C554AI

ASYNCHRONOUS-COMMUNICATIONS ELEMENT

SLLS509A – AUGUST 2001 – REVISED JULY 2003

6

POST OFFICE BOX 655303

Terminal Functions (Continued)

TERMINAL

NAME

FN

NO.

PN

NO.

I/O

DESCRIPTION

RXA, RXB

RXC, RXD

7, 29,

41, 63

17, 44,

57, 4

I

Serial input. RXx is a serial-data input from a connected communications device. During loopback

mode, the RXx input is disabled from external connection and connected to the TXx output internally.

RXRDY

38

54

O

Receive ready. RXRDY goes low when the receive FIFO is full. It can be used as a single transfer

or multitransfer.

TXA, TXB

TXC, TXD

17, 19,

51, 53

29, 32,

69, 72

O

Transmit outputs. TXx is a composite serial-data output connected to a communications device.

TXA, TXB, TXC, and TXD are set to the marking (high) state as a result of reset.

TXRDY

39

55

O

Transmit ready. TXRDY goes low when the transmit FIFO is full. It can be used as a single transfer

or multitransfer function.

VCC

13, 30,

47, 64

5, 25,

45, 65

Power supply

XTAL1

35

50

I

Crystal input 1 or external clock input. A crystal can be connected to XTAL1 and XTAL2 to utilize the

internal oscillator circuit. An external clock can be connected to drive the internal-clock circuits.

XTAL2

36

51

O

Crystal output 2 or buffered clock output (see XTAL1).

– 0.5 V to 7 V

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

– 0.5 V to 7 V

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

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

Continuous total-power dissipation at (or below) 70

°C

500 mW

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

0

°C to 70°C

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

TL16C554AI

– 40

°C to 85°C

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

– 65

°C to 150°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.

NOTE 1: All voltage levels are with respect to GND.