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STK17TA8 bảng dữ liệu(PDF) 2 Page - Cypress Semiconductor

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Giải thích chi tiết về linh kiện  128k X 8 AutoStore nvSRAM with Real Time Clock
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nhà sản xuất  CYPRESS [Cypress Semiconductor]
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STK17TA8
Document #: 001-52039 Rev. **
Page 2 of 23
Pinouts
Figure 1. Pin Diagram - 48-PIn SSOP
VSS
A14
A12
A7
A6
DQ 0
DQ 1
VCC
DQ 2
A3
A2
A1
VCAP
A13
A8
A9
A11
A10
DQ 7
DQ 6
VSS
A0
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
X1
X2
23
24
A5
INT
NC
NC
NC
NC
A4
48
47
46
45
VCC
HSB
NC
NC
W
NC
DQ 5
DQ 3
DQ 4
VRTCbat
VRTCcap
A16
A15
E
G
(TOP)
Pin Descriptions
Pin Name
IO Type
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 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 page 22..
Relative PCB Area Usage[1]
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