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CY7C138
CY7C139
2
Pin Configurations
\
Notes:
3.
I/O8R on the CY7C139.
4.
I/O8L on the CY7C139.
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
67
Top View
68-Pin PLCC
60
59
58
57
56
55
54
53
52
51
50
49
48
3132 3334353637383940414243
5 4321 68
66 65 64 63 62 61
A4L
A3L
A2L
A1L
A0L
INTL
BUSYL
GND
M/S
BUSYR
INTR
A0R
I/O2L
I/O3L
I/O4L
I/O5L
GND
I/O6L
I/O7L
VCC
GND
I/O0R
I/O1R
I/O2R
VCC
2728 29 30
98 7 6
47
46
45
44
A1R
A2R
A3R
A4R
I/O3R
I/O4R
I/O5R
I/O6R
25
26
A5L
C138-2
CY7C138/9
Pin Definitions
Left Port
Right Port
Description
I/O0L–7L(8L)
I/O0R–7R(8R)
Data Bus Input/Output
A0L–11L
A0R–11R
Address Lines
CEL
CER
Chip Enable
OEL
OER
Output Enable
R/WL
R/WR
Read/Write Enable
SEML
SEMR
Semaphore Enable. When asserted LOW, allows access to eight sema-
phores. The three least significant bits of the address lines will determine
which semaphore to write or read. The I/O0 pin is used when writing to a
semaphore. Semaphores are requested by writing a 0 into the respective
location.
INTL
INTR
Interrupt Flag. INTL is set when right port writes location FFE and is cleared
when left port reads location FFE. INTR is set when left port writes location
FFF and is cleared when right port reads location FFF.
BUSYL
BUSYR
Busy Flag
M/S
Master or Slave Select
VCC
Power
GND
Ground
Selection Guide
7C138-15
7C139-15
7C138-25
7C139-25
7C138-35
7C139-35
7C138-55
7C139-55
Maximum Access Time (ns)
15
25
35
55
Maximum Operating
Current (mA)
Commercial
220
180
160
160
Maximum Standby
Current for ISB1(mA)
Commercial
60
40
30
30
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