A6818SEP-T

A6818 DABiC-IV 32-Bit Serial Input Latched Source Driver Features and Benefits Description ▪ Controlled output slew rate ▪ 60 V minimum output break down ▪ PNP active pull-downs ▪ Low-power CMOS logic and latches ▪ High-speed data storage ▪ High data-input rate ▪ Low output-saturation voltages ▪ Improved replacements for SN75518N, SN75518NF, UCN5818x, and UCQ5818x The A6818 device combines 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 this device to be used in many other peripheral power driver applications. The A6818 features an increased data-input rate (compared with the older UCN/UCQ5818x) and a controlled output slew rate. Package: 44 pin PLCC (suffix EP) The CMOS shift register and latches allow direct interfacing with microprocessor-based systems. With a 3.3 or 5 V logic supply, typical serial data-input rates are up to 33 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 A6812 (20-bit). 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 Not to scale Continued on the next page… Functional Block Diagram V DD CLOCK SERIAL DATA IN SERIAL-PARALLEL SHIFT REGISTER STROBE LATCHES LOGIC SUPPLY SERIAL DATA OUT BLANKING MOS BIPOLAR VBB GROUND 26182.128F OUT 1 OUT 2 OUT 3 OUT N LOAD SUPPLY Dwg. FP-013-1 DABiC-IV 32-Bit Serial Input Latched Source Driver A6818 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 will sink at least 2.5 mA. Three temperature ranges are available for optimum performance in commercial (suffix S-), industrial (E-), and extended industrial (K-) applications. The package style provided is the minimum-area surface-mount PLCC (suffix -EP). Copper lead frames, low logic- power dissipation, and low output-saturation voltages allow these devices to drive most multiplexed vacuum-fluorescent displays over the maximum operating temperature range. The lead (Pb) free versions have 100% matte tin leadframe plating. Selection Guide Part Number Pb-free Packing Ambient Temperature TA (°C) Yes 450 pieces/13-in. reel –40 to 85 – 450 pieces/13-in. reel –40 to 125 Yes 450 pieces/13-in. reel –20 to 85 A6818EEPTR-T A6818KEPTR A6818SEPTR-T Absolute Maximum Ratings* Characteristic Symbol Logic Supply Voltage VDD Notes Rating Units 7.0 V Driver Supply Voltage VBB 60 V Input Voltage Range VIN –0.3 to VDD + 0.3 V Continuous Output Current Range IOUT Operating Ambient Temperature Maximum Junction Temperature Storage Temperature –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 –55 to 125 ºC TA *Caution: These CMOS devices have input static protection (Class 2) but are still susceptible to damage if exposed to extremely high static electrical charges. Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 2 DABiC-IV 32-Bit Serial Input Latched Source Driver A6818 Pin-out Diagram Thermal Characteristics Characteristic Package Thermal Resistance Symbol Test Conditions* RθJA Value Units 1-layer PCB with copper limited to solder pads 54 ºC/W *Additional thermal information available on the Allegro website. ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS 3.0 2.5 2.0 1.5 1.0 SUFFIX 'EP', RQJA = 54oC/W 0.5 0 25 TYPICAL INPUT CIRCUIT 50 75 100 125 AMBIENT TEMPERATURE IN oC 150 TYPICAL OUTPUT DRIVER Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 3 DABiC-IV 32-Bit Serial Input Latched Source Driver A6818 TRUTH TABLE Serial Shift Register Contents Data Clock Input Input I1 I2 I3 ... IN-1 IN Serial Data Strobe Output Input Latch Contents I1 I2 I3 ... IN-1 Output Contents IN Blanklng I1 I2 I3 ... IN-1 IN 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 ... X PN-1 PN X X ... X L L ... L L L = Low Logic Level H = High Logic Level X = Irrelevant P = Present State R = Previous State Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 4 DABiC-IV 32-Bit Serial Input Latched Source Driver A6818 ELECTRICAL CHARACTERISTICS at TA = +25°C (A6818S-) or over operating temperature range (A6818Eand A6818K-), 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 —