A6812ELW-T

A6812 DABiC-IV 20-Bit Serial-Input Latched Source Driver Features and Benefits Description ▪ Controlled output slew rate ▪ High-speed data storage ▪ 60 V minimum output break down ▪ High data-input rate ▪ PNP active pull-downs ▪ Low output-saturation voltages ▪ Low-power CMOS logic and latches ▪ Improved replacements for TL5812x, UCN5812x, and UCQ5812x The A6812 device combines a 20-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 A6812 features an increased data-input rate (compared with the older UCN/UCQ5812-F) and a controlled output slew rate. The CMOS shift register and latches allow direct interfacing with microprocessor-based systems. With a 3.3 or 5 V logic supply, they operate to at least 10 MHz. A CMOS serial data output permits cascaded connections in applications requiring additional drive lines. Similar devices are available as the A6810 (10-bit) and A6818 (32-bit). Package: The A6812 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 28-pin SOICW (Package LW) 28-pin PLCC (EP package) Continued on the next page… Not to scale Functional Block Diagram 26182.126F DABiC-IV 20-Bit Serial-Input Latched Source Driver A6812 Description (continued) 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 sink at least 2.5 mA. Three temperature ranges are available for optimum performance in commercial (suffix S-), industrial (suffix E-), or automotive (suffix K-) applications. Package styles are provided for surface-mount SOIC (suffix -LW), or minimum-area surface-mount PLCC (suffix -EP). Copper lead frames, low logic-power dissipation, and low output-saturation voltages allow these drivers to source 25 mA from all outputs continuously to more than 43°C (suffix -LW) or 61°C (suffix -EP). Each package is available in a lead (Pb) free version, with 100% matte tin leadframe plating. Selection Guide Part Number A6812EEPTR* Pb-free – Packing Package 800 pieces/13-in. reel PLCC Yes 1000 pieces/13-in. reel SOIC-W Yes 1000 pieces/13-in. reel SOIC-W 800 pieces/13-in. reel PLCC 1000 pieces/13-in. reel SOIC-W A6812EEPTR-T* Yes A6812ELWTR-T A6812KLWTR-T* A6812SEPTR* – A6812SEPTR-T Yes A6812SLWTR-T* Yes Ambient Temperature, TA (°C) –40 to 85 –40 to 125 –20 to 85 *Variant is in production but has been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of the variant is currently restricted to existing customer applications. The variant should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Status change: May 4, 2009. Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 2 DABiC-IV 20-Bit Serial-Input Latched Source Driver A6812 Absolute Maximum Ratings* Characteristic Symbol Notes Rating Units Logic Supply Voltage VDD 7 V Driver Supply Voltage VBB 60 V Input Voltage Range VIN –0.3 to VDD + 0.3 V Continuous Output Current Range IOUT –40 to 15 mA Range E –40 to 85 ºC Range K –40 to 125 ºC Range S –20 to 85 ºC TJ(max) 150 ºC Tstg –65 to 125 ºC Operating Ambient Temperature TA Maximum Junction Temperature Storage Temperature ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS *Caution: These CMOS devices have input static protection (Class 2) but are still susceptible to damage if exposed to extremely high static electrical charges. 2.5 2.0 SU FF IX 1.5 'E P' ,R SU FF QJ IX A= 'LW 68 oC ', R /W QJ A = 80o C/ W 1.0 0.5 0 25 50 75 100 125 AMBIENT TEMPERATURE IN oC 150 Dwg. GP-024-2 Thermal Characteristics Characteristic Package Thermal Resistance Symbol RθJA Test Conditions* Value Units Package EP, 1-layer PCB with solder limited to mounting pads 68 ºC/W Package LW, 1-layer PCB with solder limited to mounting pads 80 ºC/W *Additional thermal information available on the Allegro website Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 3 DABiC-IV 20-Bit Serial-Input Latched Source Driver A6812 22 21 9 20 11 19 OUT 20 3 26 OUT 1 OUT 19 4 25 OUT 2 OUT 18 5 24 OUT 3 OUT 17 6 OUT 16 7 OUT 15 8 23 OUT 4 22 OUT 5 21 OUT 6 OUT 14 9 20 OUT 7 OUT 13 10 19 OUT 8 OUT 12 11 18 OUT 9 ST 14 15 16 17 18 CLOCK STROBE OUT10 OUT9 14 GROUND GROUND 13 13 12 BLANKING OUT 11 BLANKING 12 OUT 8 SERIAL DATA IN OUT11 CLK 10 27 VDD LATCHES OUT 1 26 23 LATCHES REGISTER 8 REGISTER LATCHES 7 2 SERIAL DATA OUT VBB REGISTER SERIAL DATA IN 27 24 6 OUT12 OUT 2 LOGIC SUPPLY 1 LATCHES LOGIC SUPPLY V DD 28 25 5 28 LOAD SUPPLY REGISTER LOAD SUPPLY VBB OUT18 LW Package 1 SERIAL DATA OUT 2 OUT20 3 4 OUT19 EP Package BLNK 17 OUT 10 ST 28 16 STROBE CLK 27 15 CLOCK Dwg. PP-029-7 Dwg. PP-059-1 TYPICAL INPUT CIRCUIT TYPICAL OUTPUT DRIVER V DD V IN BB OUTN Dwg. EP-021-19 Dwg. EP-010-5 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 4 DABiC-IV 20-Bit Serial-Input Latched Source Driver A6812 TRUTH TABLE Serial Shift Register Contents Data Clock Input Input I1 I2 I3 ... IN-1 IN IN Serial Data Strobe Output Input Latch Contents I1 I2 I3 ... IN-1 Output Contents IN Blanklng I1 I2 I3 ... IN-1 H H R1 R2 ... RN-2 RN-1 RN-1 L L R1 R2 ... RN-2 RN-1 RN-1 X R1 R2 R3 ... RN-1 RN RN X X X L R1 R2 R3 ... RN-1 RN PN H P1 P2 P3 ... PN-1 PN L P1 P2 P3 ... PN-1 PN X X H L X X ... P1 P2 P3 ... L = Low Logic Level X PN-1 PN H = High Logic Level X = Irrelevant X P = Present State X ... X L L ... L L R = Previous State Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 5 DABiC-IV 20-Bit Serial-Input Latched Source Driver A6812 ELECTRICAL CHARACTERISTICS at TA = +25°C (A6812S-) or over operating temperature range (A6812E- or A6812K-), VBB = 60 V; unless otherwise noted Characteristic Output Leakage Current Output Voltage Symbol ICEX Test Conditions VOUT = 0 V Limits @ VDD = 3.3 V Limits @ VDD = 5 V Mln. Typ. Max. Min. Typ. Max. Units —