Cypress CY14B101NA - Manual (Page 3)

PRELIMINARY CY14B101LA, CY14B101NA
Document #: 001-42879 Rev. *B Page 3 of 25
Figure 3. Pin Diagram - 48-Pin SSOP and 32-Pin SOIC
Table 1. Pin Definitions
Pin Name I/O Type Description
A
0
– A
16
Input
Address Inputs Used to Select one of the 131,072 bytes of the nvSRAM for x8 Configuration.
A
0
– A
15
Address Inputs Used to Select one of the 65,536 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.
WE Input Write Enable Input, Active LOW. When the chip is enabled and WE is 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. I/O pins are tri-stated on deasserting OE HIGH.
BHE Input Byte High Enable, Active LOW. Controls DQ
15
- DQ
8
.
BLE Input Byte Low Enable, Active LOW. Controls DQ
7
- DQ
0
.
V
SS
Ground Ground for the Device. Must be connected to the ground of the system.
V
CC
Power
Supply
Power Supply Inputs to the Device. 3.0V +20%, –10%
HSB
[8] Input/Output Hardware STORE Busy (HSB). When LOW this output indicates that a Hardware STORE is in progress.
When pulled LOW external to the chip it initiates a nonvolatile STORE operation. A weak internal pull up
resistor keeps this pin HIGH if not connected (connection optional). After each STORE operation HSB is
driven HIGH for short time with standard output high current.
V
CAP
Power
Supply
AutoStore Capacitor. Supplies power to the nvSRAM during power loss to store data from SRAM to
nonvolatile elements.
NC No Connect No Connect. This pin is not connected to the die.
Pinouts
(continued)
NC
A
8
NC
NC
V
SS
DQ6
DQ5
DQ4
V
CC
A
13
DQ3
A
12
DQ2
DQ1
DQ0
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
NC
NC
NC
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
Top View
(not to scale)
A
10
NC
WE
DQ7
HSB
INT
V
SS
V
CC
V
CAP
NC
45
46
47
48
NC
NC
NC
NC
48-SSOP
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