Cypress STK17TA8 manual Pinouts, Pin Descriptions

STK17TA8

Pinouts

Figure 1. Pin Diagram - 48-PIn SSOP Relative PCB Area Usage[1]

VCAP A16 A14

A12

A7

A6

A5

INT

A4

NC

NC

NC

VSS

NC

VRTCbat

DQ 0

A3

A2

A1

A0

DQ 1

DQ 2

X1

X2

148 V CC

247 A15

346 HSB

445 W

544 A13

643 A8

742 A9

841 NC

940 A11

10	(TOP)	39	NC
11		38	NC
12		37	NC
13		36	V SS

1435 NC

1534 V RTCcap

1633 DQ 6

1732 G

1831 A10

1930 E

2029 DQ 7

2128 DQ 5

2227 DQ 4

2326 DQ 3

2425 V CC

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		input selects the device
			E

WInput 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

GInput 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		: When low this output indicates a Store is in progress. When pulled low external
		Hardware Store Busy
		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..

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

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