|Category||Interface and Interconnect|
|Company||Allegro Micro Systems, Inc.|
|Datasheet||Download A6818 datasheet
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
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/UCQ5818F) and a controlled output slew rate. The CMOS shift register and latches allow direct interfacing with microprocessor-based systems. With 5 V logic supply, typical serial-data input rates are 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 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.
Logic Supply Voltage, VDD................... 7.0 V Driver Supply Voltage, VBB................... 60 V Continuous Output Current Range, IOUT......................... +15 mA Input Voltage Range, VIN....................... V to VDD 0.3 V Package Power Dissipation, PD........................................ See Graph Operating Temperature Range, TA (Suffix `E').................. to +85°C (Suffix `S').................. to +85°C Storage Temperature Range, TS............................... to +125°CFEATURES
I Controlled Output Slew Rate I Low Output-Saturation Voltages I High-Speed Data Storage I Low-Power CMOS Logic 60 V Minimum and Latches Output Breakdown I Improved Replacements I High Data Input Rate for 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.SERIAL DATA OUT LOAD SUPPLY LOGIC SUPPLY SERIAL DATA IN OUT32 OUT OUT3 40
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts (508) 853-5000 Copyright 1998, 2000 Allegro MicroSystems, Inc.CLOCK SERIAL DATA IN STROBE V DD LOGIC SUPPLY SERIAL DATA OUT
Serial Shift Register Contents Data Clock Input RN X Serial Data Strobe Output Input P3... X
L = Low Logic Level H = High Logic Level X = Irrelevant
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