HP 8112A Operating, Programming And Servicing Manual page 203
50 mhz programmable pulse generator
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Figure 1 0.3· 1 . Timing IC block diagram
Refer to Figure 1 0.3- 1 and Figure 1 0.3-6. The timing IC has an input
store containing 8 control bits which control the mode of the IC :
Pin
10
CONTROL
ENABLE
1 1
GATE / TRIG
12 TRIG POS
13
TRIG NEG
14
TIME / RATE
15
MODE
16
RANGE C
17
RANGE B
18
RANGE A
Timing Generation
The main timing element of the IC is a voltage controlled oscillator
(VCO) which has two ranges of operation in each of the two
operating modes (see TIME and RATE below) . These two basic
ranges, time and frequency, are further divided if necessary by
switching divider circuits
control of the range setting.
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RANGE CONTROL
INPUT STORE
1 4
1 5
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Table 1 0.3-2. IC Digital Control Signals
Naine
Signal
A positive TTL edge on this pin latches all
WS3
the digital control signals into the input
store.
LD7
Selects trigger or gate
LD6
Positive trigger
LD5
Negative trigger
LD4
Selects TIME or RATE mode
LD3
Always 0 in this application
LD2
Range selection, refer to Table 10.3-3
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2 1
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OUTPUT
SWITCHING
1 8
1 0
1 6
1 7
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RANGE
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Function
decade counters) into operation under
Servicing the Timing and 10.3-3
Slope Generators
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