Specifications
CY14B108K, CY14B108M
Document #: 001-47378 Rev. *D Page 3 of 31
Note
4. Address expansion for 16 Mbit. NC pin not connected to die.
Pinouts
Figure 1. Pin Diagram: 44-PIn and 54-Pin TSOP II
Table 1. Pin Definitions
Pin Name I/O Type Description
A
0
– A
19
Input Address Inputs Used to Select one of the 1,048,576 bytes of the nvSRAM for x8 Configuration.
A
0
– A
18
Address Inputs Used to Select one of the 524,288 words of the nvSRAM for x16 Configuration.
DQ
0
– DQ
7
Input/Output Bidirectional Data I/O Lines for x8 Configuration. Used as input or output lines depending on
operation.
DQ
0
– DQ
15
Bidirectional Data I/O Lines for x16 Configuration. Used as input or output lines depending on
operation.
NC No Connect No Connects. This pin is not connected to the die.
WE
Input Write Enable Input, Active LOW. When selected LOW, data on the I/O pins is written to the specific
address location.
CE
Input Chip Enable Input, Active LOW. When LOW, selects the chip. When HIGH, deselects the chip.
OE
Input Output Enable, Active LOW. The active LOW OE input enables the data output buffers during read
cycles. Deasserting OE
HIGH causes the I/O pins to tristate.
BHE
Input Byte High Enable, Active LOW. Controls DQ
15
- DQ
8
.
BLE
Input Byte Low Enable, Active LOW. Controls DQ
7
- DQ
0
.
X
out
Output Crystal Connection. Drives crystal on start up.
X
in
Input Crystal Connection. For 32.768 KHz crystal.
V
RTCcap
Power Supply Capacitor Supplied Backup RTC Supply Voltage. Left unconnected if V
RTCbat
is used.
V
RTCbat
Power Supply Battery Supplied Backup RTC Supply Voltage. Left unconnected if V
RTCcap
is used.
INT
Output Interrupt Output. Programmable to respond to the clock alarm, the watchdog timer, and the power
monitor. Also programmable to either active HIGH (push or pull) or LOW (open drain).
V
SS
Ground Ground for the Device. Must be connected to ground of the system.
NC
A
8
Xin
Xout
V
SS
DQ
6
DQ5
DQ4
V
CC
A
13
DQ
3
A
12
DQ
2
DQ
1
DQ
0
OE
A
9
CE
NC
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
11
A
7
A
14
A
15
A
16
A
19
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
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
44 - TSOP II
Top View
(not to scale)
A
10
V
RTCbat
WE
DQ
7
HSB
INT
V
SS
V
CC
V
CAP
V
RTCcap
(x8)
DQ
7
DQ
6
DQ
5
DQ
4
V
CC
DQ
3
DQ
2
DQ
1
DQ
0
NC
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
V
CAP
WE
A
8
A
10
A
11
A
12
A
13
A
14
A
15
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
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
54 - TSOP II
Top View
(not to scale)
OE
CE
V
CC
INT
V
SS
NC
A
9
NC
A
18
54
53
52
51
49
50
HSB
BHE
BLE
DQ
15
DQ
14
DQ
13
DQ
12
V
SS
DQ
11
DQ
10
DQ
9
DQ
8
(x16)
V
RTCcap
V
RTCbat
Xin
Xout
[4]
[4]
A
17
A
18
A
16
A
17
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