Sharp DX-SX1H Service Manual page 59

IC804 RH-iX2839AFZZ: 1Mbit SRAM (IX2839AF)
Pin No. Terminal Name
1* NC
2 A16
3 A14
4 A12
5-12 A7-A0
13-15 I/O1-I/O3
16 GND
17-21 I/O4-I/O8
22 CE1
23 A10
24 OE
25 A11
26, 27 A9, A8
28 A13
29 R/W
30 CE2
31 A15
32 VDD
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
A4
A5
A6
A7
A8
A12
A13
A14
A15
A16
I/O1
I/O8
OE
R/W
CE1
CE2
Not used
Address input
Address input
Address input
Address input
Data input/output
Ground
Data input/output
Chip enable input
Address input
Output enable input
Address input
Address input
Address input
Read/Write input
Chip enable input
Address input
Power terminal (+5V)
CE
MEMORY CELL
ARRAY
1024 x 28 x 8
(1048576)
SENSE AMPLIFIER
COLUMN ADDRESS
DECODER
COLUMN ADDRESS
REGISTER
COLUMN ADDRESS
BUFFER
A0 A2 A9
A3
A1
CE
Figure 59 BLOCK DIAGRAM OF IC
Function
VDD
GND
CE
A11
A10
– 59 –
DX-SX1H
(TOP VIEW)
1 32
N.C.
2 31
A16
3 30
A14
4 29
A12
A7 5 28
6 27
A6
A5 7 26
8 25
A4
A3 9 24
10 23
A2
11 22
A1
12 21
A0
13 20
I/O1
14 19
I/O2
15 18
I/O3
16 17
GND
VDD
A15
CE2
R/W
A13
A8
A9
A11
OE
A10
CE1
I/O8
I/O7
I/O6
I/O5
I/O4