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High-Performance Power ICs and Hall-Effect Sensors
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Datasheets:
A6818: DABiC-IV 32-Bit Serial-Input Latched Source Drivers with Active Pull-Downs (PDF)
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Power Integrated Circuits,
Automotive ICs,
Vacuum-Fluorescent Display Drivers
Technical Publications:
Product Replacement for the 58xx Family of Serial-Input, Latched Source Drivers
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Serial-Input, Latched Source Drivers with Slew-Rate Limiting
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A6818
DABiC-IV 32-Bit Serial-Input Latched Source Drivers with Active Pull-Downs
Features
- Controlled Output Slew Rate
- High-Speed Data Storage
- 60 V Minimum Output Breakdown
- High Data Input Rate
- PNP Active Pull-Downs
- Low Output-Saturation Voltages
- Low-Power CMOS Logic and Latches
- Improved Replacements for SN75518N, SN75518NF, UCN5818-, and UCQ5818-
Description
The A6818- devices combine a 32-bit CMOS shift register, accompanying data latches and control circuitry with bipolar sourcing outputs and pnp active pull downs. Designed primarily to drive vacuum- fluorescent displays, the 60 V and -40 mA output ratings also allow these devices to be used in many other peripheral power driver applications. The A6818- features an increased data input rate (compared with the older UCN/UCQ5818-F>) and a controlled output slew rate.
The CMOS shift register and latches allow direct interfacing with microprocessor-based systems. With a 3.3 V or 5 V logic supply, typical serial-data input rates are up to 33 MHz.
A CMOS serial data output permits cascade connections in applications requiring additional drive lines. Similar devices are available as the A6810- (10 bits), A6811- (12 bits), and A6812- (20 bits).
The A6818- output source drivers are npn Darlingtons, capable of sourcing up to 40 mA. The controlled output slew rate reduces electro- magnetic noise, which is an important consideration in systems that include telecommunications and/or microprocessors and to meet government emissions regulations. For inter-digit blanking, all output drivers can be disabled and all sink drivers turned on with a BLANKING input high. The pnp active pull-downs will sink at least 2.5 mA.
Functional Block Diagram
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Samples | Distributor Stock |
|---|---|---|---|---|---|---|---|
| A6818SEP | 44-lead PLCC | No | view data | -20 °C to 85 °C | |||
| A6818SEP-T | 44-lead PLCC | Yes | view data | -20 °C to 85 °C | Contact Local Sales Representative | ||
| A6818SEPTR | 44-lead PLCC | No | view data | -20 °C to 85 °C | discontinued | samples not available | |
| A6818SEPTR-T | 44-lead PLCC | Yes | view data | -20 °C to 85 °C | Contact Local Sales Representative | ||
| A6818EEP | 44-lead PLCC | No | view data | -40 °C to 85 °C | discontinued | samples not available | |
| A6818EEP-T | 44-lead PLCC | Yes | view data | -40 °C to 85 °C | Contact Local Sales Representative | ||
| A6818EEPTR | 44-lead PLCC | No | view data | -40 °C to 85 °C | discontinued | samples not available | |
| A6818EEPTR-T | 44-lead PLCC | Yes | view data | -40 °C to 85 °C | Contact Local Sales Representative | ||
| A6818KEP | 44-lead PLCC | No | view data | -40 °C to 125 °C | Contact Local Sales Representative | ||
| A6818KEP-T | 44-lead PLCC | Yes | view data | -40 °C to 125 °C | Contact Local Sales Representative | ||
| A6818KEPTR | 44-lead PLCC | No | view data | -40 °C to 125 °C | Contact Local Sales Representative | ||
| A6818KEPTR-T | 44-lead PLCC | Yes | view data | -40 °C to 125 °C | Contact Local Sales Representative |
Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.