CY14B256K データシートの表示（PDF） - Cypress Semiconductor
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CY14B256K Datasheet PDF : 28 Pages
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CY14B256K
Pin Configurations
Figure 1. 48-Pin SSOP
V CAP
1
NC
2
A 14
3
A 12
4
A7
5
A6
6
A5
7
INT
8
A4
9
NC
10
NC
11
NC
12
V SS
13
NC
14
V RTCbat
15
DQ0
16
A3
17
A2
18
A1
19
A0
20
DQ1
21
DQ2
22
X1
23
X2
24
48-SSOP
Top View
(Not To Scale)
48
V CC
47
NC
46
HSB
45
WE
44
A 13
43
A8
42
A9
41
NC
40
A 11
39
NC
38
NC
37
NC
36
V SS
35
NC
34
V RTCcap
33
DQ6
32
OE
31
A 10
30
CE
29
DQ7
28
DQ5
27
DQ4
26
DQ3
25
V CC
Pin Definitions
Pin Name Alt
IO Type
Description
A0–A14
DQ0-DQ7
Input
Address Inputs. Used to select one of the 32,768 bytes of the nvSRAM.
Input or Output Bidirectional Data IO lines. Used as input or output lines depending on operation.
NC
No Connect No Connects. This pin is not connected to the die.
WE
W
Input
Write Enable Input, Active LOW. When the chip is enabled and WE is LOW, data on the IO
pins is written to the specific address location.
CE
E
OE
G
Input
Input
Chip Enable Input, Active LOW. When LOW, selects the chip. When HIGH, deselects the chip.
Output Enable, Active LOW. The active LOW OE input enables the data output buffers during
read cycles. Deasserting OE high causes the IO pins to tri-state.
X1
X2
VRTCcap
VRTCbat
INT
Output
Crystal Connection. Drives crystal on start up.
Input
Crystal Connection for 32.768 kHz Crystal.
Power Supply
Power Supply
Output
Capacitor Supplied Backup RTC Supply Voltage. (Left unconnected if VRTCbat is used)
Battery Supplied Backup RTC Supply Voltage. (Left unconnected if VRTCcap is used)
Interrupt Output. It is programmed to respond to the clock alarm, the watchdog timer, and the
power monitor. Programmable to either active HIGH (push or pull) or LOW (open drain).
VSS
VCC
HSB
Ground Ground for the Device. It is connected to ground of the system.
Power Supply Power Supply Inputs to the Device.
Input or Output Hardware Store Busy (HSB). When low, this output indicates a Hardware Store is in progress.
When pulled low external to the chip, it initiates a nonvolatile STORE operation. A weak internal
pull up resistor keeps this pin HIGH if not connected (connection optional).
VCAP
Power Supply AutoStore Capacitor. Supplies power to nvSRAM during power loss to store data from SRAM
to nonvolatile elements.
Document Number: 001-06431 Rev. *H
Page 2 of 28
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