Pinouts, Pin Descriptions, Pin Name Description

Pinouts

Figure 1. 48-Pin SSOP

STK14CA8

Figure 2. 32-Pin SOIC

VCAP 1

A16 2 A14 3

A12 4

A7 5

A6 6

A5 7

NC 8

A4 9

NC 10 NC 11 NC 12 VSS 13 NC 14 NC 15 DQ0 16

A3 17 A2 18 A1 19

A0 20 DQ1 21 DQ2 22 NC 23 NC 24

48 VCC

47 A15

46 HSB

45 W

44 A13

43 A8

42 A9

41 NC

40 A11

39 NC

38 NC

37 NC

36 VSS

35 NC

34 NC

33 DQ6

32 G

31 A10

30 E

29 DQ7

28 DQ5

27 DQ4

26 DQ3

25 VCC

VCAP	1	32		VCC

A16	2	31		A15


A14	3	30
				HSB

A12	4	29		W


A7	5	28		A13


A6	6	27		A8

A5	7	26		A9
A4	8	25		A11

A3	9	24			G
A2	10	23		A10
A1	11	22				E

A0	12	21	DQ7


DQ0	13	20	DQ6

DQ1	14	19	DQ5
DQ2	15	18	DQ4
VSS	16	17	DQ3

Figure 3. Relative PCB Area Usage[1]

Pin Descriptions

Pin Name

I/O

Description

A16-A0

Input

Address: The 17 address inputs select one of 131,072 bytes in the nvSRAM array.

DQ7-DQ0

I/O

Data: Bi-directional 8-bit data bus for accessing the nvSRAM.

Input

Chip Enable: The active low

input selects the device.

Input

Write Enable: The active low

allows to write the data on the DQ pins to the address location

latched by the falling edge of E.

Input

Output Enable: The active low

input enables the data output buffers during read cycles.

De-asserting G high causes the DQ pins to tri-state.

VCC

Power Supply

Power: 3.0V, +20%, -10%.

I/O

When low this output indicates a Store is in progress. When pulled low

HSB

Hardware Store Busy:

external to the chip, it initiates a nonvolatile STORE operation. A weak pull up resistor keeps this

pin high if not connected. (Connection is optional).

VCAP

Power Supply

AutoStore™ Capacitor: Supplies power to nvSRAM during power loss to store data from SRAM to

nonvolatile storage elements.

VSS

Power Supply

Ground.

No Connect

Unlabeled pins have no internal connections.

Note

1. See Package Diagrams on page 15 for detailed package size specifications.

Document Number: 001-51592 Rev. **

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