Functional Description - Philips DVDR1000/001 Service Manual

Circuit-, IC Descriptions and List of Abbreviations
9.9.10 IC7700: SRAM
Features
• High speed
— t = 12, 15, 20 ns
AA
• V = 3.3V ± 10%
CC
• Low active power
— 432 mW (max.)
— 288 mW (L version)
• Low CMOS standby power
— 18 mW (max.)
— 7.2 mW (L version)
• 2.0V Data Retention
• Automatic power-down when deselected
• TTL-compatible inputs and outputs
• Easy memory expansion with CE

Functional Description

The CY7C109V33/CY7C1009V33 is a high-performance
CMOS static RAM organized as 131,072 words by 8 bits. Easy
Logic Block Diagram
INPUT BUFFER
A
0
A
1
A
2
A
3
A
4
512 x 256 x 8
A
5
ARRAY
A
6
A
7
A
8
COLUMN
CE
1
DECODER
CE
2
WE
OE
CY7C1019V33
, CE , and OE options
1 2
POWER
DOWN
109V33–1
DVDR1000 /0x1 /691
memory expansion is provided by an active LOW chip enable
(CE ), an active HIGH chip enable (CE
1
put enable (OE), and three-state drivers. Writing to the device
is accomplished by taking chip enable one (CE
enable (WE) inputs LOW and chip enable two (CE
HIGH. Data on the eight I/O pins (I/O
written into the location specified on the address pins (A
through A ).
16
Reading from the device is accomplished by taking chip en-
able one (CE ) and output enable (OE) LOW while forcing
1
write enable (WE) and chip enable two (CE
these conditions, the contents of the memory location speci-
fied by the address pins will appear on the I/O pins.
The eight input/output pins (I/O
high-impedance state when the device is deselected (CE
HIGH or CE LOW), the outputs are disabled (OE HIGH), or
2
during a write operation (CE
The CY7C109V33 is
400-mil-wide SOJ package. The CY7C1009V33 is available in
a 32-pin, 300-mil-wide SOJ package. The CY7C1009V33 and
CY7C109V33 are functionally equivalent in all other respects.
Pin Configurations
NC
A
16
A
14
A
12
A
7
A
6
A
5
A
4
A
3
I/O
0
A
2
A
1
A
0
I/O
1
I/O
0
I/O
1
I/O I/O
2
2
GND
I/O
A
1
3
11
2
A
9
A 3
8
4
I/O A
13
4
5
WE
CE 6
2
A 7
I/O
15
5
8
V
CC
(not to scale)
NC 9
A
10
16
I/O
6
A
11
14
A
12
12
A
13
7
I/O
A 14
7 6
15
A
5
16
A
4
9. GB 267
), an active LOW out-
2
) and write
1
2
through I/O ) is then
0 7
) HIGH. Under
2
through I/O ) are placed in a
0 7
LOW, CE HIGH, and WE LOW).
1 2
available in standard
SOJ
Top View
V
32
1
CC
31 A
2
15
30
3
CE
2
4
29
WE
28
5
A
13
27
6
A
8
26
7 A
9
25
8 A
11
24
9
OE
23
A
10
10
22
CE
11
1
I/O
21
12 7
I/O
13 20 6
I/O
19
5
14
I/O
15 18
4
I/O
17
16
3
109V33–2
32 OE
31
A
30
CE
29
I/O
28 I/O
27
I/O
TSOP I
26
I/O
25
Top View I/O
24
GND
23 I/O
22 I/O
21 I/O
20 A
A
19
18 A
A
17
109V33–3
) input
0
1
32-pin,
10
7
6
5
4
3
2
1
0
0
1
2
3