Texas Instruments 880 - Parallel Interface Electrical Characteristics; Parallel Data Communication Timing

STROBE-
ACK-
BUSY
R= 470 Q FOR STROBE
+5V R = 1K Q OTHERWISE
IOH = -0.4mA
IOL = +16mA
------It> ~
74LSOO FAMILY
7400 FAMILY
ALL INPUTS
ALL OUTPUTS
Figure 7-3. Parallel Interface Electrical Characteristics
~0.5",s min.
~ I.- 0.5",s min.
1.0",smin.~ 1-01 ~ ... --- 1.0iA
smin
.---- ..... 1
U
I'"
l00nsmax.~
l00nsmax.~
U
(NOTE l)1t=o"'smin.~
.......J 2.0/AS min. (NOTE 2)
--I 6.0",s max.
(NOTE 1)
OJ'S min. ~
(NOTE 1)
_I'" OJ'S min. ~
22226Z7-32
L
DEMAND
________ ~I _I ______ ~r
NOTE1: The average timing (500",s, 10",s min., 1ooo",s max.) is for characters that do not cause the receive buffer to be full.
NOTE
2: ACK - Pulse width is 3.0",s nominal.
Figure 7-4. Parallel Data Communication Timing
7-7