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STK17TA8-RF25ITR bảng dữ liệu(PDF) 2 Page - Simtek Corporation

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2
March 2007
Document Control #ML0025 Rev 1.5
STK17TA8
Packages
48- Pin SSOP
48 Pin SSOP
VRTCbat
VCAP
VSS
A16
A14
A12
A7
A6
A5
INT
A4
VCC
A15
A13
A8
DQ0
VSS
VRTCcap
DQ6
A9
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
W
HSB
DQ1
DQ2
X1
G
A3
A2
A1
A0
X2
DQ5
A10
DQ7
DQ4
DQ3
VCC
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
E
A11
For detailed package size
specifications, see page 25.
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 or one of 16 bytes in the clock
register map
DQ7-DQ0
I/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.
X1
Output
Crystal Connection, drives crystal on startup
X2
Input
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 stor-
age elements.
VSS
Power Supply
Ground
(Blank)
No Connect
Unlabeled pins have no internal connections.


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