Maker : Allegro MicroSystems
Part No. : A6818SEP

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Product Information

6818 A6818xA LOAD SUPPLY SERIAL DATA OUT OUT 32 OUT 31 OUT 30 OUT 29 OUT 28 OUT 27 OUT 26 OUT 25 OUT 24 OUT 23 OUT 22 OUT 21 OUT 20 OUT 19 OUT 18 OUT 17 BLANKING GROUND 1 2 3 4 5 6 7 8 9 REGISTER REGISTER LATCHES LATCHES DABiC-IV, 32-BIT SERIAL-INPUT, LATCHED SOURCE DRIVER LOGIC SUPPLY SERIAL DATA IN OUT 1 OUT 2 OUT 3 OUT 4 OUT 5 OUT 6 OUT 7 OUT 8 OUT 9 OUT 10 OUT 11 OUT 12 OUT 13 OUT 14 OUT 15 OUT 16 STROBE CLOCK VBB VDD 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 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 A6809– and 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 electromagnetic 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. Two temperature ranges are available for optimum performance in commercial (suffix S-) or industrial (suffix E-) applications. Package styles are provided for through-hole DIP (suffix -A) or minimum-area surface-mount PLCC (suffix -EP). Copper lead frames, low logicpower dissipation, and low output-saturation voltages allow these devices to drive most multiplexed vacuum-fluorescent displays over the maximum operating temperature range. Data Sheet 26182.128A 10 11 12 13 14 15 16 17 18 19 20 BLNK ST CLK 22 21 Dwg. PP-029-4 ABSOLUTE MAXIMUM RATINGS at TA = 25°C Logic Supply Voltage, VDD ................... 7.0 V Driver Supply Voltage, VBB ................... 60 V Continuous Output Current Range, IOUT ......................... -40 mA to +15 mA Input Voltage Range, VIN ....................... -0.3 V to VDD + 0.3 V Package Power Dissipation, PD ........................................ See Graph Operating Temperature Range, TA (Suffix ‘E–’) .................. -40°C to +85°C (Suffix ‘S–’) .................. -20°C to +85°C Storage Temperature Range, TS ............................... -55°C to +125°C FEATURES I Controlled Output Slew Rate I Low Output-Saturation Voltages I High-Speed Data Storage I Low-Power CMOS Logic I 60 V Minimum and Latches Output Breakdown I Improved Replacements I High Data Input Rate for SN75518N, SN75518NF, I PNP Active Pull-Downs UCN5818–, and UCQ5818– Complete part number includes a suffix to identify operating temperature range (E- or S-) and package type (-A or -EP). Always order by complete part number, e.g., A6818SEP . Caution: These CMOS devices have input static protection (Class 2) but are still susceptible to damage if exposed to extremely high static electrical charges. 6818 32-BIT SERIAL-INPUT, LATCHED SOURCE DRIVER TYPICAL INPUT CIRCUIT OUT30 OUT31 A6818xEP SERIAL DATA OUT LOAD SUPPLY LOGIC SUPPLY SERIAL DATA IN OUT32 OUT 1 OUT2 41 NC OUT3 40 VDD 44 43 V DD VBB 42 6 3 5 4 2 1 OUT29 7 8 9 10 2 39 38 37 36 OUT 4 IN REGISTER REGISTER LATCHES LATCHES 11 12 Dwg. EP-010-5 35 34 33 19 32 31 30 29 OUT13 NC 13 14 15 16 OUT19 17 OUT 8 BLNK CLK 20 ST 27 ...

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