TL16C451, TL16C452

ASYNCHRONOUS COMMUNICATIONS ELEMENTS

SLLS053C – MAY 1989 – REVISED AUGUST 1999

9

POST OFFICE BOX 655303

td16

Delay time, modem input (CTS, DSR, RLSD)

↑ to set interrupt

(INTRPT) high

6

CL = 100 pF

170

ns

td17

Delay time, read MSR (IOR)

↑ to reset interrupt (INTRPT) low

6

CL = 100 pF

140

ns

parallel port switching characteristics over recommended ranges of supply voltage and operating

free-air temperature

PARAMETER

FIGURE

TEST CONDITIONS

MIN

MAX

UNIT

td18

Delay time, write parallel port control (SLIN, AFD, STB, INIT)

↓↑ to

output (IOW) high

7

CL = 100 pF

60

ns

td19

Delay time, write parallel port data (P0 – P7)

↓↑ to output (IOW) high

7

CL = 100 pF

60

ns

td20

Delay time, output enable to data, PD0 – PD7 valid after LPTOE

↓

7

CL = 100 pF

60

ns

td21

Delay time, ACK

↓↑ to INT2↓↑

7

CL = 100 pF

100

ns

PARAMETER MEASUREMENT INFORMATION

(N-2) Clock

Cycles

2 Clock

Cycles

tw1

tw2

2 V

0.8 V

N

CLK

(9 MHz Max)

BAUDOUT

(1/1)

(see Note A)

BAUDOUT

(1/2)

BAUDOUT

(1/3)

BAUDOUT

(1/N)

(N > 3)

CLK

NOTE A: BAUDOUT is an internally generated signal used in the receiver and transmitter circuits to synchronize data.

Figure 1. Baud Generator Timing Waveforms