STK17TA8

Document #: 001-52039 Rev. ** Page 2 of 23

Pinouts Figure 1. Pin Diagram - 48-PIn SSOP
V
SS
A
14
A
12
A
7
A
6
DQ
0
DQ
1
V
CC
DQ
2
A
3
A
2
A
1
V
CAP
A
13
A
8
A
9
A
11
A
10
DQ
7
DQ
6
V
SS
A
0
NC
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
NC
X
1
X
2
23
24
A
5
INT
NC
NC
NC
NC
A
4
48
47
46
45
V
CC
HSB
NC
NC
W
NC
DQ
5
DQ
3
DQ
4
V
RTCbat
V
RTCcap
A
16
A
15
E
G
(TOP)
Pin Descriptions

Pin Name IO Type Description

A16-A0Input Address: The 17 address inputs select one of 131,072 bytes in the nvSRAM array or one of 16 bytes

in the clock register map

DQ7-DQ0I/O Data: Bi-directional 8-bit data bus for accessing the nvSRAM and RTC

E Input Chip Enable: The active low E input selects the device

W Input Write Enable: The active low W enables data on the DQ pins to be written to the address location

selected on the falling edge of E

G Input Output Enable: The active low G input enables the data output buffers during read cycles.

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

X1Output Crystal Connection, drives crystal on startup

X2Input Crystal Connection for 32.768 kHz crystal

VRTCcap Power Supply Capacitor supplied backup RTC supply voltage (Left unconnected if VRTCbat is used)

VRTCbat Power Supply Battery supplied backup RTC supply voltage (Left unconnected if VRTCcap is used)

VCC Power Supply Power: 3.0V, +20%, -10%

HSB I/O Hardware Store Busy: When low this output indicates a Store is in progress. When pulled low external

to the chip, it will initiate a nonvolatile STORE operation. A weak pull up resistor keeps this pin high if

not connected. (Connection Optional).

INT Output Interrupt Control: Can be programmed to respond to the clock alarm, the watchdog timer and the

power monitor. Programmable to either active high (push/pull) or active low (open-drain)

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

NC No Connect Unlabeled pins have no internal connections.

Note
1. For detailed package size specifications, See “Package Diagrams” on page22..
Relative PCB Area Usage[1]

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