HP 5334B - Symbols Inside the Outline

Table 8-4. Symbols Inside the Outline
HP 5334B - Service Manual
8-11
Symbol
lt-
AD
at-
"
ol-
''
VF
I
D,
+EN
J. K. R. S. T
-i~
4-m 4-m
A+rn +-m
4 :]
4~~=15
CT=~
dl
"1°F
Description
Postponed output (of a pulse-triggered flip-flop). The output changes when input in-
itiating change
(e.g., a C input) returns to its initial external state or level.
Bi-threshold input (input with hysteresis)
NPN open-collector or similar output that can supply a relatively low-impedance
L
level when not turned off. Requires external pull-up. Capable of positive-logic wired-
AND connection.
Passive-pull-up output is similar to NPN open-collector output but is supplemented
with a built-in passive pull-up.
NPN open-emitter or similar output that can supply a relatively low-impedance
H
level when not turned off. Requires external pulldown. Capable of positive-logic
wired-OR connection.
Passive-pull-down output is similar to NPN open-emitter output but is supplemented
with a built-in passive pull-down.
3-state output
Output with more than usual output capability (symbol is oriented in the direction of
signal flow).
Enable input
When at its internal 1-state, all outputs are enabled.
When at its internal 0-state, open-collector and open-emitter outputs
are off, 3-state outputs are at normally defined internal logic states and
at external high-impedance state, and all other outputs
(e.g., totem-
poles) are at the internal 0-state.
Usual meanings associated with flip-flops
(e.g., R = reset, T = toggle).
Data input to a storage element equivalent to:
Shift right (left) inputs, m
= 1, 2, 3 etc. If m = 1, it is usually not shown.
Counting up (down) inputs, m
= 1, 2, 3 etc. If m = 1, it is usually not shown.
Binary grouping. m is highest power of
2.
The contents-setting input, when active, causes the content of a register to take on
the indicative value.
The content output is acftive
if the content of the register is as indicated.
Input line grouping
. . . indicates two or more terminals used to implement a single
logic input.
e.g., The paired expander inputs of SN7450.
-X 41~
Fixed-state output always stands at its internal 1 state. For example, see SN74185.