STK17T88
Pin Configurations
V
CAP
NC
A
14
A
12
A
7
A
6
A
5
INT
A
4
NC
NC
NC
V
SS
NC
V
RTCbat
DQ
0
A
3
A
2
A
1
A
0
DQ
1
DQ
2
X
1
X
2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
V
CC
NC
HSB
W
A
13
A
6
A
9
NC
A
11
NC
NC
V
SS
NC
V
RTCcap
DQ
6
G
A
10
E
DQ
7
DQ
5
DQ
4
DQ
3
V
CC
(TOP)
For detailed package size
specifications, see page 27.
48 Pin SSOP
PIN DESCRIPTIONS
Pin Name
A
14
-A
0
DQ
7
-DQ
0
E
W
G
X
1
X
2
V
RTCcap
V
RTCbat
V
CC
HSB
Input
I/O
Input
Input
Input
Output
Input
Power Supply
Power Supply
Power Supply
I/O
I/O
Description
Address: The 15 address inputs select one of 32,768 bytes in the nvSRAM array or one of 16 bytes in the clock
register map
Data: Bi-directional 8-bit data bus for accessing the nvSRAM and RTC
Chip Enable: The active low E input selects the device
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
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.
Crystal Connection, drives crystal on startup
Crystal Connection for 32.768 kHz crystal
Capacitor supplied backup RTC supply voltage (Left unconnected if V
RTCbat
is used)
Battery supplied backup RTC supply voltage (Left unconnected if V
RTCcap
is used)
Power: 3.0V, +20%, -10%
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).
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)
AutoStore Capacitor: Supplies power to nvSRAM during power loss to store data from SRAM to nonvolatile stor-
age elements.
Ground
Unlabeled pins have no internal connections.
INT
V
CAP
V
SS
(Blank)
Output
Power Supply
Power Supply
No Connect
Document Control #ML0024 Rev 2.0
Jan, 2008
2
SSOP
NC
SIMTEK [ SIMTEK CORPORATION ]
