TL16C451 Datasheet, PDF (9/23 Pages) Texas Instruments – ASYNCHRONOUS COMMUNICATIONS ELEMENTS

TL16C451, TL16C452
ASYNCHRONOUS COMMUNICATIONS ELEMENTS
SLLS053C – MAY 1989 – REVISED AUGUST 1999
td16
Delay time, modem input (CTS, DSR, RLSD)↑ to set interrupt
(INTRPT) high
td17 Delay time, read MSR (IOR)↑ to reset interrupt (INTRPT) low
6
CL = 100 pF
6
CL = 100 pF
170 ns
140 ns
parallel port switching characteristics over recommended ranges of supply voltage and operating
free-air temperature
PARAMETER
FIGURE TEST CONDITIONS
td18
Delay time, write parallel port control (SLIN, AFD, STB, INIT)↓↑ to
output (IOW) high
7
CL = 100 pF
td19 Delay time, write parallel port data (P0 – P7)↓↑ to output (IOW) high
7
td20 Delay time, output enable to data, PD0 – PD7 valid after LPTOE↓
7
td21 Delay time, ACK↓↑ to INT2↓↑
7
CL = 100 pF
CL = 100 pF
CL = 100 pF
MIN MAX UNIT
60 ns
60 ns
60 ns
100 ns
PARAMETER MEASUREMENT INFORMATION
CLK
(9 MHz Max)
tw1
2V
0.8 V
tw2
N
CLK
BAUDOUT
(1/1)
(see Note A)
BAUDOUT
(1/2)
BAUDOUT
(1/3)
BAUDOUT
(1/N)
(N > 3)
2 Clock
Cycles
(N-2) Clock
Cycles
NOTE A: BAUDOUT is an internally generated signal used in the receiver and transmitter circuits to synchronize data.
Figure 1. Baud Generator Timing Waveforms
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