A6275EA-T Datasheet | DigiCamel IC Datasheet

Manufacturer Specifications

Compare A6275EA-T variants.

Select a manufacturer to view its specifications, local PDF, and searchable HTML text.

1 manufacturers / 1 documents

Manufacturer	Series	Package	Documents	Available	Select specification
Allegro MicroSystems	-	-	1	PDF HTML	Viewing

Online Datasheet

Read the Allegro MicroSystems document online.

DATASHEET SEARCH SITE

Document overview

Manufacturer or author: Provided By www.digicamel.com(FREE DATASHEET DOWNLOAD SITE)
PDF pages: 12

Technical content

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 respon- sibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use. Recommended Substitutions: For existing customer transition, and for new customers or new appli- cations, refer to the A6279. 8-Bit Serial Input Constant-Current Latched LED Driver A6275 Date of status change: November 1, 2010 Deadline for receipt of LAST TIME BUY orders: April 30, 2011 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 This classification indicates that the product is obsolete and notice has been given.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. Last Time Buy

Description

The A6275 is specifically designed for LED display applications. Each BiCMOS device includes an 8-bit CMOS shift register, accompanying data latches, and eight NPN constant-current sink drivers. The CMOS shift register and latches allow direct interfacing with microprocessor-based systems. With a 5 V logic supply, typical serial data-input rates are up to 20 MHz. The LED drive current is de ter mined by the user selection of a single resistor. A CMOS serial data output permits cascade connections in applications requiring additional drive lines. For inter-digit blanking, all output drivers can be disabled with an ENABLE input high. A similar 150 mA output device is available as the A6277; a similar 16-bit device is available as the A6276. Two package styles are provided: a through-hole DIP (suffix A) and a surface-mount SOICW (suffix LW). Under normal applications, copper leadframes and low logic-power dissipation allow these devices to sink maximum rated current through all outputs continuously over the operating temperature range (90 mA, 0.9 V drop, 85°C). Both packages are lead (Pb) free, with 100% matte tin leadframe plating. 26185.200F Features and Benefits ▪ Up to 90 mA constant-current outputs ▪ Undervoltage lockout ▪ Low-power CMOS logic and latches ▪ High data-input rate ▪ Pin-compatible with TB62705CP 8-Bit Serial Input Constant-Current Latched LED Driver Packages Functional Block Diagram Not to scale A6275 16-pin DIP (A package) 16-pin SOICW (LW package) MOS BIPOLAR GROUND LATCH ENABLE OUTPUT ENABLE (ACTIVE LOW) SERIAL DATA OUT CLOCK SERIAL DATA IN SERIAL-PARALLEL SHIFT REGISTER LATCHES VDD LOGIC SUPPLY R EXT OUT 0 OUT 1 Dwg. FP-013-3 OUT 2 OUT N I REGULATOR O UVLO

Serial-Input Constant-Current Latched LED Driver with Open LED Detection and Dot CorrectionA6275 2Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A. Selection Guide Part Number Package Packing Ambient Temperature (°C) A6275EA-T 16-pin DIP 25 per tube –40 to 85A6275ELWTR-T 16-pin SOICW 1000 per reel A6275SLWTR-T 16-pin SOICW 1000 per reel –20 to 85 Absolute Maximum Ratings* Characteristic Symbol Notes Rating Units Supply Voltage V DD 7.0 V Input Voltage Range V I –0.4 to VDD + 0.4 V Output Voltage Range V O –0.5 to VDD + 17 V Output Current I O 90 mA Ground Current I GND 750 mA Operating Ambient Temperature T A Range E –40 to 85 ºC Range S –20 to 85 ºC Maximum Junction Temperature T J(max) 150 ºC Storage Temperature T stg –55 to 150 ºC *These CMOS devices have input static protection (Class 2) but are still sus cep ti ble to damage if exposed to extremely high static electrical charges. Thermal Characteristics may require derating at maximum conditions, see application information Characteristic Symbol Test Conditions* Value Units Package Thermal Resistance RθJA Package A, 4-layer PCB based on JEDEC standard 38 ºC/W Package LW, 4-layer PCB based on JEDEC standard 48 ºC/W *Additional thermal information available on the Allegro website. 25 50 75 100 125 150 Temperature (°C) Power Dissipation, PD (mW) 3500 3250 3000 2750 2500 2250 2000 1750 1500 1250 1000 750 500 250 Power Dissipation versus Ambient Temperature QJA = 38 ºC/W) Package A QJA = 48 ºC/W) Package LW

Serial-Input Constant-Current Latched LED Driver with Open LED Detection and Dot CorrectionA6275 3Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 U.S.A. TUO ATAD LAIRESNI ATAD LAIRES dna KCOLC LATCH ENABLEOUTPUT ENABLE (active low) Dwg. EP-010-11 IN VDD Dwg. EP-010-12 IN VDD Dwg. EP-010-13 IN VDD TRUTH TABLE Serial Shift Register Contents Serial Latch Latch Contents Output Output Contents elbanEelbanEataDkcolCataD HH R 1 R2 ... R N-2 RN-1 RN-1 LL R 1 R2 ... R N-2 RN-1 RN-1 XR 1 R2 R3 ... R N-1 RN RN L = Low Logic (Voltage) Level H = High Logic (Voltage) Level X = Irrelevant P = Present State R = Previous State VDD Dwg. EP-063-6 OUT

Serial-Input Constant-Current Latched LED Driver with Open LED Detection and Dot CorrectionA6275 4Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 U.S.A. ELECTRICAL CHARACTERISTICS at TA = +25°C, VDD = 5 V (unless otherwise noted). Limits Characteristic Symbol Test Conditions Min. Typ. Max. Unit Supply Voltage Range V DD Operating 4.5 5.0 5.5 V Undervoltage Lockout V DD(UV) VDD = 0 → 5 V 3.4 – 4.0 V Output Current I O V CE = 0.7 V, REXT = 250 Ω 64.2 75.5 86.8 mA (any single output) V CE = 0.7 V, REXT = 470 Ω 34.1 40.0 45.9 mA Output Current Matching ∆IO 0.4 V ≤ VCE(A) = VCE(B) ≤ 0.7 V: (difference between any R EXT = 250 Ω – ±1.5 ±6.0 % two outputs at same VCE) R EXT = 470 Ω – ±1.5 ±6.0 % Output Leakage Current I CEX V OH = 15 V – 1.0 5.0 μA Logic Input Voltage V IH 0.7V DD – V DD V V IL GND – 0.3V DD V SERIAL DATA OUT V OL I OL = 500 μA – – 0.4 V Voltage V OH I OH = -500 μA 4.6 – – V Input Resistance R I ENABLE Input, Pull Up 150 300 600 k Ω LATCH Input, Pull Down 100 200 400 k Ω Supply Current I DD(OFF) R EXT = open, VOE = 5 V – 0.8 1.4 mA R EXT = 470 Ω, VOE = 5 V 3.5 6.0 8.0 mA R EXT = 250 Ω, VOE = 5 V 6.5 11 15 mA I DD(ON) R EXT = 470 Ω, VOE = 0 V 5.0 10 14 mA R EXT = 250 Ω, VOE = 0 V 8.0 16 24 mA Typical Data is at VDD = 5 V and is for design information only.

Serial-Input Constant-Current Latched LED Driver with Open LED Detection and Dot CorrectionA6275 5Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 U.S.A. RECOMMENDED OPERATING CONDITIONS Characteristic Symbol Conditions Min. Typ. Max. Unit Supply Voltage V DD 4.5 5.0 5.5 V Output Voltage V O – 1.0 4.0 V Output Current I O Continuous, any one output – – 90 mA I OH SERIAL DATA OUT – – -1.0 mA I OL SERIAL DATA OUT – – 1.0 mA Logic Input Voltage V IH 0.7V DD – V DD + 0.3 V V IL -0.3 – 0.3V DD V Clock Frequency f CK Cascade operation – – 10 MHz SWITCHING CHARACTERISTICS at TA = 25°C, VDD = VIH = 5 V, VCE = 0.4 V, VIL = 0 V, REXT = 470 Ω, IO = 40 mA, VL = 3 V, RL = 65 Ω, CL = 10.5 pF. Limits Characteristic Symbol Test Conditions Min. Typ. Max. Unit Propagation Delay Time t pHL CLOCK-OUT n – 350 1000 ns LATCH-OUT n – 350 1000 ns ENABLE-OUT n – 350 1000 ns CLOCK-SERIAL DATA OUT – 40 – ns Propagation Delay Time t pLH CLOCK-OUT n – 300 1000 ns LATCH-OUT n – 300 1000 ns ENABLE-OUT n – 300 1000 ns CLOCK-SERIAL DATA OUT – 40 – ns Output Fall Time t f 90% to 10% voltage 150 350 1000 ns Output Rise Time t r 10% to 90% voltage 150 300 600 ns

Serial-Input Constant-Current Latched LED Driver with Open LED Detection and Dot CorrectionA6275 6Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 U.S.A. TIMING REQUIREMENTS and SPECIFICATIONS (Logic Levels are VDD and Ground) Serial data present at the input is transferred to the shift register on the logic 0-to-logic 1 transition of the CLOCK input pulse. On succeeding CLOCK pulses, the registers shift data in- formation towards the SERIAL DATA OUTPUT. The serial data must appear at the input prior to the rising edge of the CLOCK input waveform. Information present at any register is transferred to the respective latch when the LATCH ENABLE is high (serial-to- sa atad wen tpecca ot eunitnoc sehctal ehT .)nois rev noc lel la rap erehw snoit ac ilp pA .hgih dleh si ELBANE HCTAL eht sa gnol the latches are bypassed (LATCH ENABLE tied high) will laires gnirud hgih eb tupni ELBA NE TUPTUO eht taht eriuqer data entry. When the OUTPUT ENABLE input is high, the output sink sehctal eht ni derots noit am rof ni ehT .)FFO( delbasid era sre vird is not affected by the OUTPUT ENABLE input. With the OUT- PUT ENABLE input low, the outputs are con trolled by the state .sehctal evit ceps er rieht fo A. Data Active Time Before Clock Pulse (Data Set-Up Time), t B. Data Active Time After Clock Pulse D. noit av it cA kcolC neewteB emiT NOTE: Timing is representative of a 10 MHz clock. Sig- .elbaniatta era sdeeps rehgih yl tnac i fin CLOCK SERIAL DATA IN LATCH ENABLE OUTPUT ENABLE OUTN Dwg. WP-029-1 50%SERIAL DATA OUT DATA DATA 50% 50% 50% C A B D E LOW = ALL OUTPUTS ENABLED pt DATA 50% pt LOW = OUTPUT ON HIGH = OUTPUT OFF OUTPUT ENABLE OUTN Dwg. WP-030-1A DATA 10% 50% pHLt pLHt HIGH = ALL OUTPUTS DISABLED (BLANKED) ft rt 90% F 50%

Serial-Input Constant-Current Latched LED Driver with Open LED Detection and Dot CorrectionA6275 7Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 U.S.A. ALLOWABLE OUTPUT CURRENT AS A FUNC TION OF DUTY CYCLE A Package LW Package 02 0 DUTY CYCLE IN PER CENT 100 Dwg. GP-062-5 6040 10080 V CE = 2 V V CE = 3 V V CE = 4 V TA = +25°C V DD = 5 V R θJA = 60°C/W 02 0 DUTY CYCLE IN PER CENT 100 Dwg. GP-062-4A 6040 10080 V CE = 2 V V CE = 3 V V CE = 1 V V CE = 4 V TA = +25°C V DD = 5 V R θJA = 94°C/W 02 0 DUTY CYCLE IN PER CENT 100 Dwg. GP-062-2A 6040 10080 V CE = 1 V V CE = 2 V V CE = 3 V V CE = 4 V TA = +50°C V DD = 5 V R θJA = 94°C/W 02 0 DUTY CYCLE IN PER CENT 100 Dwg. GP-062-3 6040 10080 V CE = 2 V V CE = 3 V V CE = 4 V TA = +50°C V DD = 5 V R θJA = 60°C/W

Serial-Input Constant-Current Latched LED Driver with Open LED Detection and Dot CorrectionA6275 8Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 U.S.A. 02 0 DUTY CYCLE IN PER CENT 100 Dwg. GP-062A 6040 10080 V CE = 1 V V CE = 2 V V CE = 3 V TA = +85°C V DD = 5 V R θJA = 94°C/W V CE = 0.7 V V CE = 4 V ALLOWABLE OUTPUT CURRENT AS A FUNC TION OF DUTY CYCLE (cont.) A Package LW Package TYPICAL CHARACTERISTICS 02 0 DUTY CYCLE IN PER CENT 100 Dwg. GP-062-1 6040 10080 V CE = 1 V V CE = 2 V V CE = 3 V V CE = 4 V TA = +85°C V DD = 5 V R θJA = 60°C/W 0.5 Dwg. GP-063 1.0 2.01.5 V CE IN VOLTS T A = +25°C R EXT = 500 Ω

Serial-Input Constant-Current Latched LED Driver with Open LED Detection and Dot CorrectionA6275 9Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 U.S.A. GROUND REGISTER LATCHES SERIAL DATA OUT LOGIC SUPPLY SERIAL DATA IN OUTPUT ENABLE LATCH ENABLE CLOCK CK V DD OE OUT 1 OUT 2 OUT 0 OUT 4 OUT 6 OUT 5 OUT 3 OUT 7 R EXT I REGULATOR L O 8 9 GROUND REGISTER LATCHES SERIAL DATA OUT LOGIC SUPPLY SERIAL DATA IN OUTPUT ENABLE LATCH ENABLE CLOCK CK V DD OE OUT 1 OUT 2 OUT 0 OUT 4 OUT 6 OUT 5 OUT 3 OUT 7 R EXT I REGULATOR L O 8 9 TERMINAL DESCRIPTION Terminal No. Terminal Name Function 1 GND Reference terminal for control logic. 2 SERIAL DATA IN Serial-data input to the shift-register. 3 CLOCK Clock input terminal for data shift on rising edge. 4 LATCH ENABLE Data strobe input terminal; serial data is latched with high-level input. 5-12 OUT 0-7 The eight current-sinking output ter mi nals.

13 OUTPUT ENABLE When (active) low, the output drivers are enabled; when high, all output driv-

ers are turned OFF (blanked). 14 SERIAL DATA OUT CMOS serial-data output to the following shift-register. 15 R EXT An external resistor at this terminal establishes the output current for all sink drivers. 16 SUPPLY (V DD) The logic supply voltage (typically 5 V). Package A Pin-out Diagrams Package LW

Serial-Input Constant-Current Latched LED Driver with Open LED Detection and Dot CorrectionA6275 10Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 U.S.A. The load current per bit (IO) is set by the external re sis tor (REXT) as shown in the ﬁ gure below. 300 500 700 1 k 2 k CURRENT-CONTROL RESISTANCE, R EXT IN OHMS 100 100 Dwg. GP-061 5 k200 3 k V CE = 0.7 V Package Power Dissipation (PD). The maximum al- low able package power dissipation is determined as PD(max) = (150 - TA)/RθJA. The actual package power dissipation is PD(act) = dc(VCE × IO × 8) + (VDD × IDD). When the load supply voltage is greater than 3 V to 5 V , considering the package power dissipating limits of these devices, or if P D(act) > PD(max), an external voltage re- ducer (VDROP) should be used. Load Supply Voltage (VLED). These devices are de- signed to operate with driver voltage drops (VCE) of 0.4 V to 0.7 V with LED forward voltages (VF) of 1.2 V to 4.0 V . If higher voltages are dropped across the driver, package power dissipation will be increased signiﬁ cantly. To minimize package power dissipation, it is rec om - mend ed to use the lowest possible load supply voltage or to set any series dropping voltage (V DROP) as VDROP = VLED - VF - VCE with VDROP = Io × RDROP for a single driver, or a Zener diode (VZ), or a series string of diodes (approximately 0.7 V per diode) for a group of drivers. If the available voltage source will cause unacceptable dissipation and series resistors or diode(s) are undesirable, a regulator such as the Sanken Series SAI or Series SI can be used to pro vide supply voltages as low as 3.3 V . For reference, typical LED forward voltages are: White 3.5 – 4.0 V Blue 3.0 – 4.0 V Green 1.8 – 2.2 V Yellow 2.0 – 2.1 V Amber 1.9 – 2.65 V Red 1.6 – 2.25 V Infrared 1.2 – 1.5 V Pattern Layout. This device has a common logic-ground and power-ground terminal. If ground pattern layout con tains large common-mode resistance, and the voltage between the system ground and the LATCH ENABLE or CLOCK terminals ex ceeds 2.5 V (because of switching noise), these devices may not operate correctly. Dwg. EP-064 V LED V DROP VF V CE Applications Information

Serial-Input Constant-Current Latched LED Driver with Open LED Detection and Dot CorrectionA6275 11Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 U.S.A. Package A 16-Pin DIP 19.05±0.25

5.33 MAX

0.46 ±0.12

1.27 MIN

A 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 6.35 +0.76 –0.25 3.30 +0.51 –0.38 10.92 +0.38 –0.25 1.52 +0.25 –0.38 0.38 +0.10 –0.05 7.62 2.54 For Reference Only (reference JEDEC MS-001 BB) Dimensions in inches, metric dimensions (mm) in brackets, for reference only Package LW 16-Pin SOICW 9.50 0.65 2.25 1.27 CSEATING PLANE 1.27 0.25 0.20 ±0.10 0.41 ±0.10 2.65 MAX 4° ±4 0.27 +0.07 –0.06 0.84 +0.44 –0.43 10.30±0.20 C0.10 16X GAUGE PLANE SEATING PLANE For Reference Only Dimensions in millimeters (reference JEDEC MS-013 AA) 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 A B Reference pad layout (reference IPC SOIC127P1030X265-16M) All pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary to meet application process requirements and PCB layout tolerances B PCB Layout Reference View Copyright ©2000-2008, Allegro MicroSystems, Inc. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such de par tures from the detail spec i fi ca tions as may be required to per- mit improvements in the per for mance, 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 in for ma tion in clud ed herein is believed to be ac cu rate and reliable. How ev er, Allegro MicroSystems, Inc. assumes no re spon si bil i ty for its use; nor for any in fringe ment 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

Selected Specification

Allegro MicroSystems A6275EA-T overview.

Summary

8-Bit Serial Input Constant-Current Latched LED Driver

Description

The A6275 is specifically designed for LED display applications. Each BiCMOS device includes an 8-bit CMOS shift register, accompanying data latches, and eight NPN constant-current sink drivers.

Source title A6275EA-T Datasheet(PDF) - Allegro MicroSystems

Related Parts

More parts from the same family.

Browse manufacturer