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SCHMITT TRIGGER PAC, MODEL ST-335
The Schmitt Trigger PAC, Model ST-335 (Figures A-102 and A-103), contains
two independent trigger circuits, each capable of converting arbitrarily shaped inputs to
µ-PAC compatible outputs.
The Schmitt trigger is versatile and can be used for such ap-
plications as pulse shaping, signal level shifting, level detecting, and level comparing.
In
addition, each circuit can perform signal attenuation, differentiation and integration by
use of available resistor-capacitor networks.
Provisions are made at the input, whereby the input signal may be attenuated be-
fore it is applied to the base of the first transistor stage.
The attenuating network will be
needed only when the input signal exceeds the positive voltage supply of the PAC (usually
+6v, or when the input signal is more negative than -20v).
CIRCUIT FUNCTION
Each circuit has a single input and output.
The only amplitude restriction is that
the input signal, which appears at the base of the input transistor, must not exceed the posi-
tive voltage supply to prevent input clipping.
However, the signal may be as low as -20v
with no detrimental effect.
These input restrictions are independent of the switching levels.
The output of each trigger circuit is directly compatible with the µ-PAC product line.
SPECIFICATIONS
Frequency of Operation (System)
DC to 5 me
Output Drive Capability
8 unit loads and 40 pf stray
capacitance each
Circuit Delay
20 nsec (typ)
Switching Levels
(Refer to Table A-5)
Variation of Switching Levels Over
Temperature
50 mv (max)
Input Signal at Base of Input Transistor
+6v (max positive)
-20v (max negative)
Current Requirements
+6v:
90 ma (max)
-6v:
60 ma (max)
Power Dissipation
O. 90w (max)
Handle Color Code
Orange
A-185
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