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B3. BASIC SIGNAL SPECIFICATIONS
Logical TRUE
A high signal is defined as a logical TRUE or a logical ONE if it is in the range
of +2.4 volts to +5.0 volts, not to exceed a peak positive voltage of 5.5 voJts.
".
Logical FALSE
A low signal is defined as a logical FALSE or a logical ZERO if it is in the
range of 0.0 volt to +0.4 volt, not to exceed a peak negative voltage of -0.5 volt.
Level
A signal which is present for two or more clock times or whose pulse width is not
critical is defined as a level (e.g., the data inputs).
Pulse
A signal whose width is critical is defined as a pulse (e.g., DATA STROBE) and
the width is specified. Pulse width is measured at +2.4 volt for a true con-
dition and +0.4 volt for a false condition.
Delay lime
Delay time is defined as the interval between the specified signal at the re-
ceiving end of a cable and reference signal in the receiving unit. It is measured
at the +2.4 volt point for a logical ONE and +0.4 volt for a logical ZERO.
Switching Time
Switching time is defined as the rise or fall of a signal, whichever is greater.
It is specified between +0.4 volt and +2.4 volts. Maximum switching time for
signals is 0.2 usec (not including set-up and hold times).
Current Requirements
For a high input signal to the printer, the input device must be able to source
0.320 milliamps at +2.4 volts. For a low input; the input device must be able to
sink 14 milliamps.
For a high output from the printer, the printer can source up to 0.320 milliamps
at +2.4 volts. For a low output, the printer can sink up to 14 milliamps.
Line Terminations
Data lines are terminated in the printer by 1000 ohms to +5 volts. DATA STROBE
and INPUT PRIME lines .are terminated by 470 o
MIS
to +5 volts.
8-4
Rev. E
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