Datasheet

TL16CP754C, TL16C754C

SLLS644G –DECEMBER 2007– REVISED MAY 2011

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TERMINAL FUNCTIONS (continued)

TERMINAL

I/O DESCRIPTION

NAME NO.

Transmit data. These outputs are associated with individual serial transmit channel data from

the '754C. During the local loopback mode, the TX input pin is disabled and TX data is

TXA, TXB, 8, 10,

O internally connected to the UART RX input. During normal mode, TXn is high when no data is

TXC, TXD 39, 41

being sent. These outputs can also be used in IrDA mode, in which case TXn is low when no

data is being sent. See the IrDA mode section for more information.

Transmit ready (active low). TXRDY contains the wire-ORed status of all four transmit channel

TXRDY

(2)

– O FIFOs, TXRDY A–D. It goes low when there are a trigger level number of spares available. It

goes high when all four TX buffers are full.

4, 35,

Pwr Power supply inputs

Crystal or external clock input. XTAL1 functions as a crystal input or as an external clock input.

A crystal can be connected between XTAL1 and XTAL2 to form an internal oscillator circuit (see

XTAL1 25 I

Figure 10). Alternatively, an external clock can be connected to XTAL1 to provide custom data

rates.

Output of the crystal oscillator or buffered clock. See also XTAL1. XTAL2 is used as a crystal

XTAL2 26 O

oscillator output or buffered clock output.

(2) RXRDY and TXRDY functionality is not supported in the TL16C754CPM device.