CY7C025AV-20AI Ver la hoja de datos (PDF) - Cypress Semiconductor
Número de pieza
componentes Descripción
Lista de partido
CY7C025AV-20AI Datasheet PDF : 18 Pages
| |||
PRELIMINARY
CY7C024AV/025AV/026AV
CY7C0241AV/0251AV/036AV
Functional Description
The CY7C024AV/025AV/026AV and CY7C0241AV/0251AV /
036AV are low-power CMOS 4K, 8K, and 16K x16/18 dual-
port static RAMs. Various arbitration schemes are included on
the devices to handle situations when multiple processors ac-
cess the same piece of data. Two ports are provided, permit-
ting independent, asynchronous access for reads and writes
to any location in memory. The devices can be utilized as stan-
dalone 16/18-bit dual-port static RAMs or multiple devices can
be combined in order to function as a 32/36-bit or wider mas-
ter/slave dual-port static RAM. An M/S pin is provided for im-
plementing 32/36-bit or wider memory applications without the
need for separate master and slave devices or additional dis-
crete logic. Application areas include interprocessor/multipro-
cessor designs, communications status buffering, and dual-
port video/graphics memory.
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 sig-
nals that the port is trying to access the same location currently
being accessed by the other port. The Interrupt flag (INT) per-
mits 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 re-
source is in use. An automatic power-down feature is con-
trolled independently on each port by a Chip Select (CE) pin.
The CY7C024AV/025AV/026AV and CY7C0241AV/0251AV/
036AV are available in 100-pin Thin Quad Plastic Flatpacks
(TQFP).
Pin Configurations
100-Pin TQFP
Top View
NC
NC
NC
NC
I/O10L
I/O11L
I/O12L
I/O13L
GND
I/O14L
I/O15L
VCC
GND
I/O0R
I/O1R
I/O2R
VCC
I/O3R
I/O4R
I/O5R
I/O6R
NC
NC
NC
NC
100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76
75
1
74
2
73
3
72
4
71
5
70
6
69
7
68
8
67
9
66
10
65
11
12
13
CY7C024AV (4K x 16)
64
63
62
14
CY7C025AV (8K x 16)
61
15
60
16
59
17
58
18
57
19
56
20
55
21
54
22
53
23
52
24
51
25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
NC
NC
NC
NC
A5L
A4L
A3L
A2L
A1L
A0L
INTL
BUSYL
GND
M/S
BUSYR
INTR
A0R
A1R
A2R
A3R
A4R
NC
NC
NC
NC
Notes:
6. A12L on the CY7C025AV.
7. A12R on the CY7C025AV.
2
Share Link: 