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PCB-MAIN (7/8)
IC7A2 HD74LVC14T
1
1A
2
1Y
3
2A
4
2Y
5
3A
6
3Y
7
GND
PCB-MAIN (8/8)
SDA
WP
SCL
NC
NC
NC
Vcc
Vss
14
VCC
FUNCTION TABLE
13
6A
INPUT
OUTPUT
A
Y
12
H
L
6Y
L
H
11
5A
10
5Y
9
4A
8
4Y
IC7H2 SP232ECN
1
C1+
3
C1-
4
C2+
5
C2-
11
T1 IN
TTL/CMOS
INPUT
10
T2 IN
12
R1 OUT
TTL/CMOS
OUTPUT
9
R2 OUT
The negative terminal of the V+ storage capacitor can be tied
to either Vcc or GND. Connecting the capacitor to Vcc (+5V)
is recommended.
IC705 CAT24WC128J/ 24C128T-I/SN
Dout ACK
(Open drain)
Word Address Buffers
5
Start/Stop
Logic
Control Logic
7
6
State Counters
1
2
3
8
4
IC7A3 TC74VHCT32AFT
1
1A
2
1B
3
1Y
4
2A
5
2B
6
2Y
7
GND
Vcc
16
2
+5V to +10V
V+
Voltage Doubler
6
+10V to -10V
V-
Voltage Inverter
400kΩ
14
T1
T1 OUT
RS-232
400kΩ
OUTPUT
7
T2
T2 OUT
13
R1
R1 IN
RS-232
5kΩ
INPUT
8
R2
R2 IN
5kΩ
15
GND
Sense Amps
Shift Registers
Column Decorders
256
E2PROM
XDEC
(256×512)
Data In Storage
High Voltage
Timing Control
B-7
14
FUNCTION TABLE
VCC
(each gate)
13
4B
INPUTS
OUTPUT
12
4A
Y
A
B
L
L
L
L
H
H
11
4Y
H
L
H
10
H
H
H
3B
: HIGH LEVEL
9
H
H
3A
: LOW LEVEL
L
L
8
3Y
512
&
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