HP 5340A Service Manual

Model 5340A
Theory of Operation
4 - 45. Dual Two - Input Logic Switch 1820-0560
4 - 46. The logic switch (Figure 4 - 20) functions as a single pole, double throw switch for EECL
logic signals. The C input controls selection of either the A or
B input; similarly, the F input
controls the D and E input selection. Complementary
50 ohm outputs are provided from the out -
put gates.
Figure 4
- 20. Dual Two - Input Logic Switch 1820 - 0560
POSITIVE LOGIC " 1 " = High
"0" = Low
.
3
14
I
D
5, -
E
7
GND
NEGATIVE LOGIC
" 1 " = Low
"0" = High
, 1
5
12
7
3
14
6
13
I
16
I
11
<- 1
I I
16 11
NOTE:
) = Virtual Gate, No Delay
L,/
4 - 47. Dual D - Type Edge - Triggered Flip - Flops 1820 - 0596
4 - 48. This IC contains low - power dual edge - triggered flip - flops as shown in Figure 4 - 21.
Infor -
mation at the D - input is transferred to the Q output on the positive - going edge of the clock pulse.
Clock triggering occurs at a voltage level
of the clock pulse and is not directly related to the
transition time
of the positive - going pulse. When the clock is at either a high or low level, the D-
input signal has no effect. Maximum clock frequency is typically 3 MHz with a typical power
dissapation of 4.25 milliwatts per flip
- flop.
4 - 49. Four-Input Multiplexer 1820 - 0610
4 - 50. The 1820 - 0610 (Figure 4 - 22) consists of two 4 - line input multiplexers with common input
select logic. This configuration allows two bits of data to be switched in parallel to the approp
-
riate outputs from two 4 - bit data sources. Complementary outputs are provided. The truth table
for the multiplexer is
show9 belpw.
4 - 14

HP 5340A Specifications

General

Brand	HP
Model	5340A
Category	Cash Counter
Language	English