Datasheet

TL16C451, TL16C452
ASYNCHRONOUS COMMUNICATIONS ELEMENTS
SLLS053C – MAY 1989 – REVISED AUGUST 1999
9
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
t
d16
Delay time, modem input (CTS, DSR, RLSD)↑ to set interrupt
(INTRPT) high
6 C
L
= 100 pF 170 ns
t
d17
Delay time, read MSR (IOR)↑ to reset interrupt (INTRPT) low 6 C
L
= 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
t
d18
Delay time, write parallel port control (SLIN, AFD, STB, INIT)↓↑ to
output (IOW
) high
7 C
L
= 100 pF 60 ns
t
d19
Delay time, write parallel port data (P0 – P7)↓↑ to output (IOW) high 7 C
L
= 100 pF 60 ns
t
d20
Delay time, output enable to data, PD0 – PD7 valid after LPTOE↓ 7 C
L
= 100 pF 60 ns
t
d21
Delay time, ACK↓↑ to INT2↓↑ 7 C
L
= 100 pF 100 ns
PARAMETER MEASUREMENT INFORMATION
(N-2) Clock
Cycles
2 Clock
Cycles
t
w1
t
w2
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