Service manual

UX-340L/UX-345L
UX-330L
8 – 8
IC1: RH-IX2129SCZZ (M514800C-70J)
TEL/LIU PWB UNIT
IC1: VHiNJM2904D-1 (NJM2904D)
1
2
3
4
8
7
6
5
–
+
OUTPUT 1
INVERTING INPUT 1
NON-INVERTING INPUT 1
VCC
VCC
OUTPUT 2
INVERTING INPUT 2
NON-INVERTING INPUT 2
-
–
+
+
VCC
1
I/O0
2
I/O1
3
I/O2
4
I/O3
5
NC
6
WE
7
RAS
8
A9
9
A0
10
A1
11
A2
12
A3
13
VCC
14
28
VSS
27
I/O7
26
I/O6
25
I/O5
24
I/O4
23
CAS
22
OE
21
NC
20
A8
19
A7
18
A6
17
A5
16
A4
15
VSS
PIN DESCRIPTION
PIN
A0~A9
I/O0~I/O7
RAS
PIN NAME
ADDRESS INPUT
(LOW/REFRESH A0~A3
COLUMN A0~A3)
DATA I/O
LOW ADDRESS STROBE
PIN
CAS
PIN NAME
COLUMN ADDRESS STROBE
WE READ/WRITE INPUT
OE OUTPUT ENABLE
VCC POWER (+5V)
VSS CONNECTION
P-CH SENSE AMP
256K MEMORY CELL ARRAY
N-CH SENSE AMP
I/O BUS & COLUMN DETECTOR
N-CH SENSE AMP
256K MEMORY CELL ARRAY
P-CH SENSE AMP
256K MEMORY CELL ARRAY
N-CH SENSE AMP
I/O BUS & COLUMN DETECTOR
N-CH SENSE AMP
256K MEMORY CELL ARRAY
P-CH SENSE AMP
PERIPHERAL CIRCUIT
IO3
I/O2 BUFFER
IO2
I/O1 BUFFER
IO1
I/O0 BUFFER
IO0
P-CH SENSE AMP
256K MEMORY CELL ARRAY
N-CH SENSE AMP
I/O BUS & COLUMN DETECTOR
N-CH SENSE AMP
256K MEMORY CELL ARRAY
P-CH SENSE AMP
256K MEMORY CELL ARRAY
N-CH SENSE AMP
I/O BUS & COLUMN DETECTOR
N-CH SENSE AMP
256K MEMORY CELL ARRAY
P-CH SENSE AMP
I/O7 BUFFER
IO7
I/O6 BUFFER
IO6
I/O5 BUFFER
IO5
I/O4 BUFFER
IO4
P-CH SENSE AMP
COLUMN DETECTOR
P-CH SENSE AMP
PERIPHERAL CIRCUIT
P-CH SENSE AMP P-CH SENSE AMP
ROW ADDRESS BUFFER COLUMN ADDRESS BUFFER
ADDRESS A0~A9
A0~A9 A0~A8
RAS
CONTROL CIRCUIT
RAS
CAS
CONTROL CIRCUIT
CAS
WE
CONTROL CIRCUIT
WE
OE
CONTROL CIRCUIT
OE
ROW DETECTOR & PERIPHERAL CIRCUIT
BLOCK DIAGRAM
I/O3 BUFFER