Vivitar Transtar 315, Руководство оператора, Страница: 25 / 80

3. Electrical
conditions
a) Signal levels
All input/output
signals
are
TTL level.
“HIGH” level 42.4
5.0[V]
At the
receiving pin
“LOW” level
+0.0 0.4[V]
on
printer
side.
T
=
the value
as
shown
on
the
timing chart.
Ts, T,
<
100
ns
b)
Input/output
conditions
Except
for
the STROBE and INITIAL
signals, all input/output lines
are
pulled
up
to
+5.0
[V] with
a
1OK
[ohm]
resistor.
"Input
signals
The
input
loading
is
equivalent to
a
single
74LS04
gate input.
"Output
signals
The
output
is
equivalent to the
output
of
a
single 74LS04
gate.
The
recommended
load for
the
outputs
is
a
single
TTL
or
LSTTL
input
gate.
100Q
linput]
74 LS
04
equvalent
1000 PF
L
The STROBE and INITIAL
signals
are
pulled
up
to +5.0 [V] with
a
1000
ohm resistor. One hundred
(100) ohms and 1000
PF
are
added
to
the STROBE
and INITIAL
signals only.
20