ST16C2550CQ48 datasheet(5/34 Pages) EXAR

部品番号	ST16C2550CQ48

部品情報	DUAL UART WITH 16-BYTE TRANSMIT AND RECEIVE FIFOS

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メーカー	EXAR [Exar Corporation]

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ST16C2550

5

Rev. 3.20

SYMBOL DESCRIPTION

Symbol

Signal

Pin Description

40

44

48

type

individual channels, A through B. The state at these pin(s)

are defined by the user and through the software setting of

MCR register bit-3. INT A-B are set to the active mode and

OP2 to a logic 0 when MCR-3 is set to a logic 1. INT A-B are

set to the three state mode and OP2 to a logic 1 when MCR-

3 is set to a logic 0. See bit-3, Modem Control Register

(MCR bit-3).

RESET

35

39

36

I

Reset. (active high) - A logic 1 on this pin will reset the

internal registers and all the outputs. The UART transmitter

output and the receiver input will be disabled during reset

time. (See ST16C2550 External Reset Conditions for ini-

tialization details.)

-RXRDY A-B

-

34,23 31,18

O

Receive Ready A-B (active low) - This function is associ-

ated with 44 pin PLCC and 48 pin TQFP packages only. This

function provides the RX FIFO/RHR status for individual

receive channels (A-B). RXRDY is primarily intended for

monitoring DMA mode 1 transfers for the receive data

FIFOs. A logic 0 indicates there is receive data to read/

unload, i.e., receive ready status with one or more RX

characters available in the FIFO/RHR. This pin is a logic 1

when the FIFO/RHR is empty or when the programmed

trigger level has not been reached. This signal can also be

used for single mode transfers (DMA mode 0).

-TXRDY A-B

-

1,12

43,6

O

Transmit Ready A-B (active low) - This function is associ-

ated with 44 pin PLCC and 48 pin TQFP packages only.

These outputs provide the TX FIFO/THR status for indi-

vidual transmit channels (A-B). TXRDY is primarily in-

tended for monitoring DMA mode 1 transfers for the trans-

mit data FIFOs. An individual channels -TXRDY A-B buffer

ready status is indicated by logic 0, i.e., at least one location

is empty and available in the FIFO or THR. This pin goes to

a logic 1 when there are no more empty locations in the

FIFO or THR. This signal can also be used for single mode

transfers (DMA mode 0).

VCC

40

44

42

Pwr

Power supply input.

同様の部品番号 - ST16C2550CQ48

メーカー	部品番号	データシート	部品情報
Exar Corporation	ST16C2550CQ48	661Kb / 39P	2.97V TO 5.5V DUART WITH 16-BYTE FIFO
	ST16C2550CQ48	821Kb / 37P	Up to 4 Mbps with external clock of 64 MHz
	ST16C2550CQ48F	158Kb / 1P	Flammability rating of UL 94?륷0

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