A6841 DABiC-5 8-Bit Serial Input Latched Sink Drivers Last Time Buy This part is in production but has been determined to be LAST TIME BUY. This classification indicates that the product is obsolete and notice has been given. Sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available. Date of status change: November 1, 2010 Deadline for receipt of LAST TIME BUY orders: April 30, 2011 Recommended Substitutions: For existing customer transition, and for new customers or new applications, contact Allegro Sales. NOTE: For detailed information on purchasing options, contact your local Allegro field applications engineer or sales representative. Allegro MicroSystems, Inc. reserves the right to make, from time to time, revisions to the anticipated product life cycle plan for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use. A6841 DABiC-5 8-Bit Serial Input Latched Sink Drivers Features and Benefits Description ▪ 3.3 to 5 V logic supply range ▪ Power-on reset (POR) ▪ To 10 MHz data input rate ▪ CMOS, TTL compatible inputs ▪ –40°C operation available ▪ Low-power CMOS logic and latches ▪ Schmitt trigger inputs for improved noise immunity ▪ High-voltage current-sink outputs ▪ Internal pull-up/pull-down resistors ▪ Output transient-protection diodes ▪ Single or split supply operation The merging of low-power CMOS logic and bipolar output power drivers using the proprietary DABiC-5 fabrication process permit the A6841 integrated circuits to be used in a wide variety of peripheral power driver applications. Each device has an eight-bit CMOS shift register and CMOS control circuitry, eight CMOS data latches, and eight bipolar current-sinking Darlington output drivers. The 500 mA, NPN Darlington outputs, with integral transient-suppression diodes, are suitable for use with relays, solenoids, and other inductive loads. All package variations of the A6841 offer premium performance with a minimum output-breakdown voltage rating of 50 V (35 V sustaining). All drivers can be operated with a split supply where the negative supply is up to –20 V. Packages: Not to scale 18-pin DIP (Package A) 20-pin SOICW (package LW) (drop-in replacement for discontinued 18-pin SOIC variants) The CMOS inputs are compatible with standard CMOS logic levels. TTL circuits may require the use of appropriate pull-up resistors. By using the serial data output, drivers can be cascaded for interface applications requiring additional drive lines. The A6841 is provided in an 18-pin plastic DIP (suffix A), and a 20-pin wide-body SOIC (suffix LW) with improved thermal characteristics compared to the 18-pin SOIC version it replaces (100% pin-compatible electrically).These devices are lead (Pb) free, with 100% matte tin plated leadframes. Applications include: ▪ Relays ▪ Solenoids ▪ Inductive loads Functional Block Diagram CLOCK SERIAL DATA IN GROUND LOGIC SUPPLY V DD SERIAL DATA OUT SERIAL-PARALLEL SHIFT REGISTER STROBE LATCHES OUTPUT ENABLE (ACTIVE LOW) MOS BIPOLAR VEE or POWER GROUND VEE or POWER GROUND SUB OUT 1 OUT 2 OUT 3 OUT 4 OUT 5 OUT 6 OUT 7 OUT 8 26185.114I K A6841 DABiC-5 8-Bit Serial Input Latched Sink Drivers Selection Guide Part Number A6841SA-T A6841SLWTR-20-T Package 18-pin DIP 20-pin wide body SOIC Packing 21 pieces per tube 1000 pieces per reel Ambient –20ºC to 85ºC Absolute Maximum Ratings* Characteristic Symbol Notes Rating Units Logic Supply Voltage VDD 7 V Emitter Supply Voltage VEE –20 V VIN –0.3 to VDD +0.3 V VCE 50 V Input Voltage Range Output Voltage Continuous Output Current VCE(SUS) IOUT For inductive load applications 35 V Each output 500 mA Range E –40 to 85 ºC Range S –20 to 85 ºC Operating Ambient Temperature TA Maximum Junction Temperature TJ(max) 150 ºC Tstg –55 to 150 ºC Storage Temperature Caution: CMOS devices have input-static protection, but are susceptible to damage when exposed to extremely high static-electrical charges. Allowable Package Power Dissipation, PD 2.5 2.0 POWER DISSIPATION (W) 18-PIN DIP, R QJA = 65oC/W 1.5 20-PIN SOIC, R QJA = 90 oC/W 1.0 0.5 0 25 50 75 100 125 AMBIENT TEMPERATURE (º C) 150 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 2 A6841 DABiC-5 8-Bit Serial Input Latched Sink Drivers ELECTRICAL CHARACTERISTICS1 Unless otherwise noted: TA = 25°C, VEE = 0 V, logic supply operating voltage VDD = 3.0 to 5.5 V Vdd = 3.3 V Characteristic Typ. VOUT = 50 V – – 10 IOUT = 350 mA, L = 3 mH 35 – IOUT = 100 mA – IOUT = 200 mA – Symbol Output Leakage Current ICEX Output Sustaining Voltage VCE(SUS) Collector–Emitter Saturation Voltage VCE(SAT) Test Conditions IOUT = 350 mA VIN(1) Input Voltage Input Resistance Serial Data Output Voltage Maximum Clock Frequency2 Max. Min. Typ. Max. Units – – 10 μA – 35 – – V – 1.1 – – 1.1 V – 1.3 – – 1.3 V – – 1.6 – – 1.6 V 2.2 – – 3.3 – – V VIN(0) – – 1.1 – – 1.7 V RIN 50 – – 50 – – kΩ V VOUT(1) IOUT = –200 μA 2.8 3.05 – 4.5 4.75 – VOUT(0) IOUT = 200 μA – 0.15 0.3 – 0.15 0.3 V 10 – – 10 – – MHz fc Logic Supply Current Vdd = 5 V Min. IDD(1) One output on, OE = L, ST = H – – 2.0 – – 2.0 mA IDD(0) All outputs off, OE = H, ST = H, P1 through P8 = L – – 100 – – 100 μA μA Clamp Diode Leakage Current Ir Vr = 50 V – – 50 – – 50 Clamp Diode Forward Voltage Vf If = 350 mA – – 2 – – 2 V tdis(BQ) VCC = 50 V, R1 = 500 Ω, C1 ≤ 30 pF – – 1.0 – – 1.0 μs ten(BQ) VCC = 50 V, R1 = 500 Ω, C1 ≤ 30 pF – – 1.0 – – 1.0 μs Output Enable-to-Output Delay tp(STH-QL) VCC = 50 V, R1 = 500 Ω, C1 ≤ 30 pF – – 1.0 – – 1.0 μs tp(STH-QH) VCC = 50 V, R1 = 500 Ω, C1 ≤ 30 pF – – 1.0 – – 1.0 μs Output Fall Time tf VCC = 50 V, R1 = 500 Ω, C1 ≤ 30 pF – – 1.0 – – 1.0 μs Output Rise Time tr VCC = 50 V, R1 = 500 Ω, C1 ≤ 30 pF – – 1.0 – – 1.0 μs IOUT = ±200 μA – 50 – – 50 – ns Strobe-to-Output Delay Clock-to-Serial Data Out Delay tp(CH-SQX) 1Positive (negative) current is defined as conventional current going into (coming out of) the specified device pin. 2Operation at a clock frequency greater than the specified minimum value is possible but not warranteed. Truth Table Serial Data Clock Input Input Shift Register Contents I8 Serial Data Output R1 R2 ... R7 R7 R1 R2 ... R7 R7 R1 R2 R3 ... R8 R8 X X X P8 P8 I1 I2 H H L L X X I3 X ... ... P1 P2 P3 ... L = Low Logic Level H = High Logic Level X = Irrelevant Latch Contents Strobe Input I1 I2 Output Contents I1 I2 I3 ... I8 ... I8 L R1 R2 R3 ... R8 H P1 P2 P3 ... P8 L P 1 P2 P3 ... P8 X X H H X I3 Output Enable Input X ... H H ... H 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 3 A6841 DABiC-5 8-Bit Serial Input Latched Sink Drivers Timing Requirements and Specifications (Logic Levels are VDD and Ground) C 50% CLOCK A SERIAL DATA IN B DATA 50% t p(CH-SQX) SERIAL DATA OUT DATA 50% D 50% STROBE OUTPUT ENABLE E LOW = ALL OUTP UTS E NABLE D tp(STH-QH) tp(STH-QL) 90% DATA OUT N 10% HIGH = ALL OUTP UTS BLANKE D (DIS ABLE D) OUTPUT ENABLE 50% t en(BQ) tr tf t dis(BQ) OUT N 10% Key Description A Data Active Time Before Clock Pulse (Data Set-Up Time) B DATA 90% 50% Symbol tsu(D) Time (ns) Data Active Time After Clock Pulse (Data Hold Time) th(D) 25 C Clock Pulse Width tw(CH) 50 D Time Between Clock Activation and Strobe tsu(C) 100 E Strobe Pulse Width tw(STH) 50 NOTE: Timing is representative of a 10 MHz clock. Higher speeds may be attainable; operation at high temperatures will reduce the specified maximum clock frequency. Powering-on with the inputs in the low state ensures that the registers and latches power-on in the low state (POR). Serial Data present at the input is transferred to the shift register on the logical 0 to logical 1 transition of the CLOCK input pulse. On succeeding CLOCK pulses, the registers shift data information towards the SERIAL DATA OUTPUT. The serial data must appear at the input prior to the rising edge of the CLOCK input waveform. 25 Information present at any register is transferred to the respective latch when the STROBE is high (serial-to-parallel conversion). The latches will continue to accept new data as long as the STROBE is held high. Applications where the latches are bypassed (STROBE tied high) will require that the OUTPUT ENABLE input be high during serial data entry. When the OUTPUT ENABLE input is high, all of the output buffers are disabled (OFF). The information stored in the latches or shift register is not affected by the OUTPUT ENABLE input. With the OUTPUT ENABLE input low, the outputs are controlled by the state of their respective latches. Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 4 A6841 DABiC-5 8-Bit Serial Input Latched Sink Drivers Pin-out Diagrams Package A Package LW VEE 1 18 OUT1 VEE 1 20 OUT1 CLOCK 2 17 OUT2 CLOCK 2 19 OUT2 SERIAL DATA IN 3 16 OUT3 SERIAL DATA IN 3 18 OUT3 GROUND 4 15 OUT4 GROUND 4 17 OUT4 LOGIC SUPPLY 5 14 OUT5 LOGIC SUPPLY 5 16 OUT5 SERIAL DATA OUT 6 13 OUT6 SERIAL DATA OUT 6 15 OUT6 STROBE 7 12 OUT7 STROBE 7 14 OUT7 OUTPUT ENABLE 8 11 OUT8 OUTPUT ENABLE 8 13 OUT8 10 K VEE 9 VEE 9 NC 10 12 K 11 NC (NC pins, 10 and 11, not present on discontinued 18-pin LW package) Terminal List Table Name VEE CLOCK Description Power Ground to substrate Clock Number Package A Package LW 1, 9 1, 9 2 2 SERIAL DATA IN Serial Data In 3 3 GROUND Logic Ground 4 4 VDD Logic Supply 5 5 Serial Data Out, for cascading devices 6 6 Strobe 7 7 Output Enable (active low) 8 8 Common to +VL , for inductive loads 10 12 Not internally connected – 10, 11 SERIAL DATA OUT STROBE OUTPUT ENABLE K NC OUT8 Sink Output 8 11 13 OUT7 Sink Output 7 12 14 OUT6 Sink Output 6 13 15 OUT5 Sink Output 5 14 16 OUT4 Sink Output 4 15 17 OUT3 Sink Output 3 16 18 OUT2 Sink Output 2 17 19 OUT1 Sink Output 1 18 20 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 5 A6841 DABiC-5 8-Bit Serial Input Latched Sink Drivers Typical Application Relay/solenoid driver using split supply 18-pin DIP (A Package) CLOCK 2 18 CLK 6 STROBE 7 OUTPUT ENABLE 8 9 V DD LATCHES 5 SHIFT REGISTER 4 17 CLOCK 2 16 SERIAL DATA IN 3 15 OE 20 SUB CLK 14 5 19 18 4 V DD 17 16 SERIAL DATA OUT 6 12 STROBE 7 ST 14 11 OUTPUT ENABLE 8 OE 13 13 ST +30 V 1 SUB 3 SERIAL DATA OUT +5 V –15 V LATCHES 1 SERIAL DATA IN 20-pin SOICW (LW Package) +30 V SHIFT REGISTER +5 V –15 V 10 9 SUB 15 12 SUB 11 10 Pins 10 and 11 can float; other pins match discontinued 18-pin SOIC: 1 to 9 same, pins 12 to 20 match pins 10 to 18 Typical Input Circuits Typical Output Driver VDD K OUT STROBE OUTPUT ENABLE VEE SUB VDD CLOCK SERIAL DATA IN Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 6 A6841 DABiC-5 8-Bit Serial Input Latched Sink Drivers Package A, 18-Pin DIP 22.86 ±0.51 18 +0.10 0.25 –0.05 +0.76 6.35 –0.25 +0.38 10.92 –0.25 7.62 A 1 2 5.33 MAX +0.51 3.30 –0.38 2.54 +0.25 1.52 –0.38 0.46 ±0.12 SEATING PLANE C All dimensions nominal, not for tooling use (reference JEDEC MS-001 AC) Dimensions in inches Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown A Terminal #1 mark area Package LW, 20-Pin SOICW 12.80±0.20 4° ±4 20 20 +0.07 0.27 –0.06 7.50±0.10 10.30±0.33 A 1 2.25 9.50 +0.44 0.84 –0.43 2 1 2 0.65 0.25 20X SEATING PLANE 0.10 C 0.41 ±0.10 1.27 C SEATING PLANE GAUGE PLANE 1.27 B PCB Layout Reference View 2.65 MAX 0.20 ±0.10 For Reference Only Dimensions in millimeters (Reference JEDEC MS-013 AC) Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown A Terminal #1 mark area B Reference pad layout (reference IPC SOIC127P1030X265-20M) All pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary to meet application process requirements and PCB layout tolerances Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 7 A6841 DABiC-5 8-Bit Serial Input Latched Sink Drivers Copyright ©2004-2010 Allegro MicroSystems, Inc. The products described here are manufactured under one or more U.S. patents or U.S. patents pending. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current. 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. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringement of patents or other rights of third parties which may result from its use. For the latest version of this document, visit our website: www.allegromicro.com Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 8