DOB bus
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Digital Out Type B (DOB) Bus
Electrical Layer Interface
This is a unidirectional daisy-chained shift-register based bus. The input of one stage connects to the output of the previous stage. Similar to SPI (tm), but without select lines for each shift register. Three wire interface, data, clock, and store.
Transmission Layer Interface
Bits are clocked in MSB first. The clk and store latch on positive (low-to-high) going transition. Can be used with the following chips: (non-complete list):
Available or planned Daughterboards with DOB bus interface
(Incomplete) List of compatible devices
- 74xx595 / 74xx596
- TPIC6C595 / TPIC6C596 (Texas Instruments or compatible)
- STPIC6C595 (from ST)
- STP08C596 (from ST)
- STP16C596 (from ST, 16bit)
- A6595 (Allegro or compatible)
- UCN 5821A / UCN 5822A (Allegro or compatible)
- UCN 5841A / UCN 5842A (Allegro or compatible)
- CD / CMOS 4094
- MAX4820 (a quick glance over the datasheet looks like this chip should work as well)
- MIC5821/22 (from Micrel)
- combination of ULN2803 or UCN2981 with 74x595 or CMOS 4094
- but the most adaptable way is to use the 74xx595 / 74xx596 in combination with transistors. You just pop in the transistor that provides the current drive and voltage capability you need. While this approach takes up more boardspace, it is certainly the most allround solution of the ones mentioned on this page. Also, matching transitors are often easier to find than some of the spceialty chips above. And probably cheaper.
Comparison table for the above chips
| chip | Manufacturer | Technology | Channels | max Output Voltage | output current | ||
| continous, all channels on | cont., not all on | pulsed abs. max | |||||
| TPIC6595 | Texas Instruments | DMOS | 8 | 45V | 250mA | 1A | 1.5A |
| TPIC6A595 | Texas Instruments | DMOS | 8 | 50V | 350mA | 1A | 1.1A |
| TPIC6B595 | Texas Instruments | DMOS | 8 | 50V | 150mA | 500mA | 500mA |
| TPIC6C595 | Texas Instruments | DMOS | 8 | 33V | 100mA | 250mA | 500mA |
| TPIC6596 | Texas Instruments | DMOS | 8 | 45V | 250mA | 1A | 750mA |
| TPIC6A596 | Texas Instruments | DMOS | 8 | 50V | 350mA | 1A | 1.1A |
| TPIC6B596 | Texas Instruments | DMOS | 8 | 50V | 150mA | 500mA | 1A |
| TPIC6C596 | Texas Instruments | DMOS | 8 | 33V | 100mA | 250mA | 500mA |
| A6595 | Allegro | DMOS | 8 | 50V | 250mA | 2A | |
| A6A595 | Allegro | DMOS | 8 | 50V | 350mA | 1.1A | |
| A6B595 | Allegro | DMOS | 8 | 50V | 150mA | 500mA | |
| STPIC6C595 | STMicroelectronics | DMOS | 8 | 33V | 100mA | 250mA | 500mA |
| STP08C596 | STMicroelectronics | DMOS | 8 | 16V | 120mA | ||
| STP16C596 | STMicroelectronics | DMOS | 16 | 16V | 120mA | ||
| MIC5821 | Micrel | BiCMOS | 8 | 35V | 125mA | 500mA | |
| MIC5822 | Micrel | BiCMOS | 8 | 50V | 125mA | 500mA | |
| UCN5821A | Allegro | BiCMOS | 8 | 50V | 180mA | 500mA | |
| UCN5822A | Allegro | BiCMOS | 8 | 80V | 180mA | 500mA | |
| UCN5841A | Allegro | BiCMOS | 8 | 35V | 180mA | 500mA | |
| UCN5842A | Allegro | BiCMOS | 8 | 50V | 180mA | 500mA | |
| MAX4820 | Maxim | BiCMOS | 8 | 150mA | 300mA | ||
| CMOS 4094 | several | ||||||
| 74LS595 | several | ||||||
| 74HC595 | several | ||||||
| 74HCT595 | several | ||||||
| ULN2803/74HCT595 | Allegro/Other | Bipolar/CMOS | 8 | 50V | 200mA | 500mA | 500mA |
| Transistors/74HC | T595 several | CMOS/Bipolar/FET | 8 | depends on Transistor | depends on transistor | ||
Note: all Specs are usually at 25degC, Note that most of these parts are not pin-compatible with each other. Some values are guesswork. Always refer to the datasheets for the guaranteed values and more info.