CY7C008V-20AC Cypress Semiconductor Corp, CY7C008V-20AC Datasheet - Page 2

• Manufacturer Part Number: CY7C008V-20AC
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C008V-20AC

• Density: 512Kb
• Access Time (max): 20ns
• Operating Supply Voltage (typ): 5V
• Package Type: TQFP
• Operating Temp Range: 0C to 70C
• Supply Current: 265mA
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 100
• Word Size: 8b
• Lead Free Status / Rohs Status: Not Compliant

Functional Description
The CY7C008V/009V and CY7018V/019V are low-power
CMOS 64K, 128K x 8/9 dual-port static RAMs. Various arbitra-
tion schemes are included on the devices to handle situations
when multiple processors access the same piece of data. Two
ports are provided permitting independent, asynchronous ac-
cess for reads and writes to any location in memory. The de-
vices can be utilized as standalone 8/9-bit dual-port static
RAMs or multiple devices can be combined in order to function
as a 16/18-bit or wider master/slave dual-port static RAM. An
M/S pin is provided for implementing 16/18-bit or wider mem-
ory applications without the need for separate master and
slave devices or additional discrete logic. Application areas
include interprocessor/multiprocessor designs, communica-
tions status buffering, and dual-port video/graphics memory.
Pin Configurations
Note:
Document #: 38-06044 Rev. *B
4.
This pin is NC for CY7C008V.
[4]
SEML
CE0L
CE1L
R/WL
A10L
A11L
A12L
A13L
A14L
A15L
A16L
GND
VCC
OEL
A7L
A8L
A9L
NC
NC
NC
NC
NC
NC
NC
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
100
26
99
27
98
28
97
29
96
30
95
31
94
32
CY7C009V (128K x 8)
CY7C008V (64K x 8)
93
33
92 91 90
34 35 36
100-Pin TQFP
(Top View)
89
37
88
38
87 86
39 40
Each port has independent control pins: chip enable (CE),
read or write enable (R/W), and output enable (OE). Two flags are
provided on each port (BUSY and INT). BUSY signals that the port is
trying to access the same location currently being accessed by the
other port. The interrupt flag (INT) permits communication between
ports or systems by means of a mail box. The semaphores are used
to pass a flag, or token, from one port to the other to indicate that a
shared resource is in use. The semaphore logic is comprised of eight
shared latches. Only one side can control the latch (semaphore) at
any time. Control of a semaphore indicates that a shared resource is
in use. An automatic power-down feature is controlled independently
on each port by a chip select (CE) pin.
The CY7C008V/009V and CY7018V/019V are available in
100-pin Thin Quad Plastic Flatpacks (TQFP).
85
41
84
42
83 82 81
43 44 45
80
46
79
47
78 77
48 49
76
50
CY7C008V/009V
CY7C018V/019V
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
NC
NC
A7R
A8R
A9R
A10R
A11R
A12R
A13R
A14R
A15R
A16R
GND
NC
NC
NC
NC
CE0R
CE1R
SEMR
R/WR
OER
GND
GND
NC
[4]
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