TL16C550B, TL16C550BI

ASYNCHRONOUS COMMUNICATIONS ELEMENT

SLLS136B – JANUARY 1994 – REVISED AUGUST 1996

9

POST OFFICE BOX 655303

receiver switching characteristics over recommended ranges of supply voltage and operating

free-air temperature (see Note 3)

PARAMETER

ALT. SYMBOL

FIGURE

TEST CONDITIONS

MIN

MAX

UNIT

td12

Delay time, RCLK to sample

tSCD

4

10

ns

td13

Delay time, stop to set interrupt or read

RBR to LSI interrupt or stop to RXRDY

↓

tSINT

4,5,6,7,8

1

RCLK

cycle

td14

Delay time, read RBR/LSR to reset interrupt low

tRINT

4,5,6,7,8

CL = 75 pF

40

ns

NOTE 3: In the FIFO mode, the read cycle (RC) = 425 ns (minimum) between reads of the receiver FIFO and the status registers (interrupt

identification register or line status register).

transmitter switching characteristics over recommended ranges of supply voltage and operating

free-air temperature

PARAMETER

ALT. SYMBOL

FIGURE

TEST CONDITIONS

MIN

MAX

UNIT

td15

Delay time, initial write (INTRPT low) to transmit

start (SOUT low)

tIRS

9

8

24

baudout

cycles

td16

Delay time, stop (SOUT low) to interrupt (INTRPT

high)

tSTI

9

8

9

baudout

cycles

td17

Delay time, WR THR high to reset interrupt

(INTRPT low)

tHR

9

CL = 75 pF

50

ns

td18

Delay time, initial WR THR low to THRE interrupt

(INTRPT high)

tSI

9

16

32

baudout

cycles

td19

Delay time, RD IIR low to reset THRE interrupt

(INTRPT low)

tIR

9

CL = 75 pF

35

ns

td20

Delay time, WR THR high to TXRDY high

(inactive)

tWXI

10,11

CL = 75 pF

35

ns

td21

Delay time, start (SOUT low) to TXRDY low

(active)

tSXA

10,11

CL = 75 pF

8

baudout

cycles

modem control switching characteristics over recommended ranges of supply voltage and

PARAMETER

ALT. SYMBOL

FIGURE

MIN

MAX

UNIT

td22

Delay time, WR MCR low to output (RTS, DTR, OUT1, OUT2) low or high

tMDO

12

50

ns

td23

Delay time, modem interrupt (CTS, DSR, DCD) low to set interrupt

(INTRPT) high

tSIM

12

35

ns

td24

Delay time, RD MSR low to reset interrupt (INTRPT) low

tRIM

12

40

ns