Memory DensiTIes From 8k x 8 Through 512k x 8 in the Same FootprintThe PowerCap package provides for an easy memory density upgrade without having to change the PCB hardware layout. When designing this package into a system, the higher order address signals should be connected to the package so that a higher density NV RAM can be added to the system without hardware modifications. All three family types have power, ground, address, data, and control signals on the same pins. Depending on the family type, pins 1, 4, 33, and 34 have other functions associated with them.
Figure 1. Powercap and module base generic diagram.
Table 1. Part numbers by family and density
| Phantom Clocks | Watchdog Clocks | Bytewide Clocks | Bytewide NV SRAM | NV SRAM Density (Bytes) | Addresses Required |
| DS1386-8 | DS1643 | 8k | A12-A0 | ||
| DS1553 | DS1743 | 8k | A12-A0 | ||
| DS1244 | DS1386-32 | DS1644 | DS1230 | 32k | A14-A0 |
| DS1544 | DS1744 | DS1330 | 32k | A14-A0 | |
| DS1248 | DS1486 | DS1646 | DS1245 | 128k | A16-A0 |
| DS1556 | DS1746 | DS1345 | 128k | A16-A0 | |
| DS1251 | DS1647 | DS1250 | 512k | A18-A0 | |
| DS1557 | DS1747 | DS1350 | 512k | A18-A0 |
The two-piece assembly protects the lithium battery, contained in the PowerCap (upper half) from the high temperatures of reflow soldering. The module base (lower half) is a small PCB with surface-mount leads, SRAM, and controller ICs. After the module base is surface-mounted, the PowerCap is snapped onto the base to complete the module.
The PowerCap is ordered separately from the base. The DS9034 PowerCap contains a battery for bytewide module bases. The DS9034PCX contains a battery and crystal to operate the real-time clock in the clock bases.
| PowerCap | Module Base |
| DS9034PC | Bytewide NV SRAM |
| DS9034PCX | Bytewide Clock |
| DS9034PCX | Phantom Clock |
| DS9034PCX | Watchdog Clock |
LED Switches
LED Switches
LED Switches, belong to LED Light Switches serious, is also called flat-reset LED indication switch. The overall appearance of the product is a flat panel type, and can be automatically reset. The switch function part has an LED indicator, which not only accurately indicates the on/off state of the switch, but also makes it easy for the user to find the switch position in the darkness.
LED Push Button Switches are suitable for consumer products, computer products, test instruments, communication equipment. This light switch could contain momentary switches and self lock and it is very sensitive. It could work only with a little strength, just a bit like Micro Switches . Furthermore, the shape of the light could be round, square and five position as well. In addition, we could equip with all kinds of color for the LED On Off Switch, including white,yellow,red, green,etc. One more important advantage for our light switch is that we could equip with double color for the LED light switches,like red&green, red&blue, red&yellow.
Different from other switches,including Metal Switches, Rotary Switches, Slide Switches, Automotive Switches, LED switches is a flat design with no rocker protruding parts. The style is modern and fashionable,not easy to dust. Its opening and closing operations are all in the same position. After the release of the hand, the rocker automatically restores the flatness and feels better and lasts longer.
Led Light Switches,Led Light Switch 220V,Led Light Dimmer Switch,Lighting Switch With Led Indicator
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