Sharp UX-340L Service Manual page 84

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