HP 5340A Service Manual

Model 5340A
Theory of Operation
XOOXlO
circuit time constants. An internal timing resistor is available by connecting Vcc (pin 14) to pin 9,
also an external resistor may be used between these two pins. The external timing capacitor
connects between pins
10 and 11. The output pulse duration is determined by the RC time con -
stant of the timing components. The truth table shows the logic states that result in a one - shot
output. When the multivibrator fires, the outputs are independent
of further input transitions
and are dependent only on the timing components.
Figure 4 - 11. Monostable Multivibrator 1820 - 0261
TIMING PINS
'CC NC NC ,-fi-, NC
TRUTH TABLE
'n INPUT 'nti INPUT
OUTPUT
INHIBIT
INHIBIT
INHIBIT
ONE SHOT
ONE SHOT
ONE SHOT
ONE SHOT
INHIBIT
INHIBIT
INHIBIT
INHIBIT
INHIBIT
INHIBIT
b NC Al A2 B 0
NOTES I 1, = TIME BEFORE INPUT TRANSITION
2 In+, = TIME AFTER INPUT TRANSITION
3 X INDICATES THAT EITHER A
1820- 0261 ~SN741213
MONOSTABLE MULTIVIBRATORS
LOGICAL 0 OR I MAY BE
PRESENT
4 - 29. Differential Video Amplifier 1820 - 0270
4 - 30. The video amplifier is shown in Figure 4 - 12. This IC consists of a two - stage differential
output amplifier with differential inputs.
The unit features
120 MHz bandwidth, selectable
gain and high input impedance.
Gain
is determined by connecting a resistor from pin 4 to pin 9.
For maximum gain, pins 4 and 9 are shorted together.
Figure
4 - 12. Differential Video Amplifier 1820 - 0270
G1 A
GAIN SELECT
GA .IN
G2A SELECT p+
INPUT 1
INPUT 2
G2B
GAIN SELECT
I-
Gl B
GAIN SELECT
Note:
Pin 5 connected to case.
OUTPUT
1
OUTPUT 2
4 - 9

HP 5340A Specifications

General

Brand	HP
Model	5340A
Category	Cash Counter
Language	English