Cypress CY7C145 - Manual (Page 3)

CY7C145, CY7C144
Document #: 38-06034 Rev. *D Page 3 of 21
Figure 3. 80-Pin TQFP
Pin Configurations
(continued)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
17
16
18
19
20
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 37 36 38 39 40
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
44
45
43
42
41
80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 64 65 63 62 61
/O 2L
/O
3L
/O
4L
/O
5L
/O
6L
/O
7L
V CC
GND
/O
0R
/O
1R
2R
/O 3R
/O 4R
5R
GND
V CC
V
CC
OE
L
I/O
0L
I/O
8L
A 5L
A
12
L
A
11
L
A
10
L
A
9L
A
8L
A
7L
A
6L
CE
L
SE
M
L
R/W
L
A 4L
A 3L
A 2L
A
1L
A 0L
GND
BUSY L
M/S
A 0R
A
1R
A 2R
A 3R
A 4R
INT
L
GND OE
R
/O 6R
A
12
R
A
11
R
A
10
R
A
9R
A
8R
A
7R
A
6R NC
CE
R
SEM
R
R/W
R
CY7C145
BUSY R
INT R
I/O
8R NC NC NC
NC
NC NC NC NC NC
NC
NC
NC
NC
A
5R
I/O
7R
NC
/O
O
NC
I/O
1L
Table 1. Pin Definitions
Left Port Right Port Description
I/O
0L −7L(8L)
I/O
0R −7R(8R)
Data bus Input/Output
A
0L −12L
A
0R −12R
Address Lines
CE
L
CE
R
Chip Enable
OE
L
OE
R
Output Enable
R/W
L
R/W
R
Read/Write Enable
SEM
L
SEM
R
Semaphore Enable. When asserted LOW, allows access to eight semaphores. The three least signif-
icant bits of the address lines will determine which semaphore to write or read. The I/O
0
pin is used
when writing to a semaphore. Semaphores are requested by writing a 0 into the respective location.
INT
L
INT
R
Interrupt Flag. INT
L
is set when right port writes location 1FFE and is cleared when left port reads
location 1FFE. INT
R
is set when left port writes location 1FFF and is cleared when right port reads
location 1FFF.
BUSY
L
BUSY
R
Busy Flag
M/S Master or Slave Select
V
CC
Power
GND Ground
Table 2. Selection Guide
Description
7C144-15
7C145-15
7C144-25
7C145-25
7C144-35
7C145-35
7C144-55
7C145-55
Unit
Maximum Access Time 15 25 35 55 ns
Maximum Operating Current 220 180 160 160 mA
Maximum Standby Current for I
SB1
60 40 30 30 mA
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