CY7C138, CY7C139
Document #: 38-06037 Rev. *D Page 2 of 17
Pin Configurations

Figure 1. 68-Pin PLCC (Top View)

\

Table 1. 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

CELCERChip Enable

OELOEROutput Enable

R/WLR/WRRead/Write Enable

SEML SEMRSemaphore Enable. When asserted LOW, allows access to eight

semaphores. 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.

INTLINTRInterrupt 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.

BUSYLBUSYRBusy Flag

M/S Master or Slave Select

VCC Power

GND Ground

10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
67
60
59
58
57
56
55
54
53
52
51
50
49
48
3132 33 34 35 36 37 38 39 40 41 42 43
54 3 2 168 666564636261
A
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
A
2728 29 30
9876
47
46
45
44
A1R
A2R
A3R
A4R
I/O3R
I/O4R
I/O5R
I/O6R
25
26
6L
7L
A
8L
A
9L
A
A
10L
11L
VCC
NC
NC
CEL
SEML
R/WL
OEL
NC
I/O
I/O1L
0L
A
A
6R
7R
A8R
A9R
A10R
NC
NC
CE
R
SEMR
R/W
R
OER
I/O7R
GND
A11R
A5R
A5L
NC
CY7C138/9
[3]
[4]
NC
NC

Table 2. Selection Guide

Description 7C138-15

7C139-15

7C138-25

7C139-25

7C138-35

7C139-35

7C138-55

7C139-55 Unit

Maximum Access Time (ns) 15 25 35 55 ns

Maximum Operating Current Commercial 220 180 160 160 mA

Maximum Standby Current for ISB1 Commercial 60 40 30 30 mA

Notes

3. I/O8R on the CY7C139.

4. I/O8L on the CY7C139.

[+] Feedback