A6275ELW

6275 8-BIT SERIAL-INPUT, CONSTANTCURRENT LATCHED LED DRIVER A6275ELW GROUND SERIAL DATA IN CLOCK LATCH ENABLE OUT 0 OUT 1 OUT 2 OUT 3 1 2 3 4 5 6 7 8 CK L REGISTER LATCHES 12 11 10 9 OE VDD IO REGULATOR 16 15 14 13 LOGIC SUPPLY REXT SERIAL DATA OUT OUTPUT ENABLE OUT 7 OUT 6 OUT 5 OUT 4 The A6275EA and A6275ELW are specifically designed for LEDdisplay applications. Each BiCMOS device includes an 8-bit CMOS shift register, accompanying data latches, and eight npn constantcurrent sink drivers. Except for package style and allowable package power dissipation, the two devices are identical. 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 determined by the user’s 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. Similar 16-bit devices are available as the A6276EA and A6276ELW. Two package styles are provided for through-hole DIP (suffix A) or surface-mount SOIC (suffix LW). Under normal applications, copper lead frames 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 devices are also available for operation over the standard temperature range of -20°C to +85°C. To order, change the suffix letter ‘E’ to ‘S’. Data Sheet 26185.200 Dwg. PP-029-10 Note that the A6275EA (DIP) and the A6275ELW (SOIC) are electrically identical and share a common terminal number assignment. ABSOLUTE MAXIMUM RATINGS Supply Voltage, VDD ...................... 7.0 V Output Voltage Range, VO ............................ -0.5 V to +17 V Output Current, IO ........................ 90 mA Ground Current, IGND ................. 750 mA Input Voltage Range, VI .................... -0.4 V to VDD + 0.4 V Package Power Dissipation, PD ..................................... See Graph Operating Temperature Range, TA ............................. -40°C to +85°C Storage Temperature Range, TS ........................... -55°C to +150°C Caution: These CMOS devices have input static protection (Class 2) but are still susceptible to damage if exposed to extremely high static electrical charges. FEATURES I I I I I To 90 mA Constant-Current Outputs Under-Voltage Lockout Low-Power CMOS Logic and Latches High Data Input Rate Pin-Compatible with TB62705CP Always order by complete part number, e.g., A6275EA . 6275 8-BIT SERIAL-INPUT, CONSTANT-CURRENT LATCHED LED DRIVER ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS 2.5 2.0 SUFFIX 'A', R θJA = 60°C/W 1.5 1.0 SUFFIX 'LW', R 0.5 θJA = 80°C/W 0 25 50 75 100 125 AMBIENT TEMPERATURE IN °C 150 Dwg. GP-018B FUNCTIONAL BLOCK DIAGRAM VDD CLOCK SERIAL DATA IN LATCH ENABLE UVLO LOGIC SUPPLY SERIAL DATA OUT SERIAL-PARALLEL SHIFT REGISTER LATCHES OUTPUT ENABLE (ACTIVE LOW) MOS BIPOLAR GROUND IO REGULATOR R EXT OUT 0 OUT 1 OUT 2 OUT N Dwg. FP-013-3 2 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 2000, Allegro MicroSystems, Inc. 6275 8-BIT SERIAL-INPUT, CONSTANT-CURRENT LATCHED LED DRIVER V DD V DD IN IN Dwg. EP-010-7 Dwg. EP-010-6 OUTPUT ENABLE (active low) VDD LATCH ENABLE VDD IN OUT Dwg. EP-063-1 Dwg. EP-010-5 CLOCK and SERIAL DATA IN TRUTH TABLE Serial Shift Register Contents Data Clock Input Input I1 I2 I3 ... IN-1 IN H L X H L R1 R2 ... R1 R2 ... RN-2 RN-1 RN-2 RN-1 RN-1 RN X X Serial Latch Data Enable Output Input RN-1 RN-1 RN X PN L H R1 R2 R3 ... P1 P2 P3 ... X L = Low Logic (Voltage) Level H = High Logic (Voltage) Level X X ... Latch Contents I1 I2 I3 ... SERIAL DATA OUT IN-1 IN Output Enable Input Output Contents I1 I2 I3 ... IN-1 IN R1 R2 R3 ... X X X ... RN-1 RN PN-1 PN X X L H P1 P2 P3 ... PN-1 PN H H H ... H R = Previous State H P1 P2 P3 ... PN-1 PN X = Irrelevant P = Present State www.allegromicro.com 3 6275 8-BIT SERIAL-INPUT, CONSTANT-CURRENT LATCHED LED DRIVER ELECTRICAL CHARACTERISTICS at TA = +25°C, VDD = 5 V (unless otherwise noted). Limits Characteristic Supply Voltage Range Under-Voltage Lockout Output Current (any single output) Output Current Matching (difference between any two outputs at same VCE) Output Leakage Current Logic Input Voltage ICEX VIH VIL SERIAL DATA OUT Voltage Input Resistance VOL VOH RI IOL = 500 µA IOH = -500 µ4A ENABLE Input, Pull Up LATCH Input, Pull Down Supply Current IDD(OFF) REXT = open, VOE = 5 V REXT = 470 Ω, VOE = 5 V REXT = 250 Ω, VOE = 5 V IDD(ON) REXT = 470 Ω, VOE = 0 V REXT = 250 Ω, VOE = 0 V Typical Data is at VDD = 5 V and is for design information only. Symbol VDD VDD(UV) IO Test Conditions Operating VDD = 0 ¡ 5 V VCE = 0.7 V, REXT = 250 Ω VCE = 0.7 V, REXT = 470 Ω ∆IO 0.4 V ≤ VCE(A) = VCE(B) ≤ 0.7 V: REXT = 250 Ω REXT = 470 Ω VOH = 15 V – – – 0.7VDD GND – 4.6 150 100 – 3.5 6.5 5.0 8.0 ±1.5 ±1.5 1.0 – – – – 300 200 0.8 6.0 11 10 16 ±6.0 ±6.0 5.0 VDD 0.3VDD 0.4 – 600 400 1.4 8.0 15 14 24 % % µA V V V V kΩ kΩ mA mA mA mA mA Min. 4.5 3.4 64.2 34.1 Typ. 5.0 – 75.5 40.0 Max. 5.5 4.0 86.8 45.9 Unit V V mA mA 4 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 6275 8-BIT SERIAL-INPUT, CONSTANT-CURRENT LATCHED LED DRIVER 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 Propagation Delay Time Symbol tpHL Test Conditions CLOCK-OUTn LATCH-OUTn ENABLE-OUTn CLOCK-SERIAL DATA OUT Propagation Delay Time tpLH CLOCK-OUTn LATCH-OUTn ENABLE-OUTn CLOCK-SERIAL DATA OUT Output Fall Time Output Rise Time tf tr 90% to 10% voltage 10% to 90% voltage Min. – – – – – – – – 150 150 Typ. 350 350 350 80 300 300 300 80 350 300 Max. 1000 1000 1000 110 1000 1000 1000 110 1000 600 Unit ns ns ns ns ns ns ns ns ns ns RECOMMENDED OPERATING CONDITIONS Characteristic Supply Voltage Output Voltage Output Current Symbol VDD VO IO IOH IOL Logic Input Voltage VIH VIL Clock Frequency fCK Cascade operation Continuous, any one output SERIAL DATA OUT SERIAL DATA OUT Conditions Min. 4.5 0.7VDD -0.3 Typ. 5.0 1.0 Max. 5.5 4.0 90 -1.0 1.0 VDD + 0.3 0.3VDD 10 Unit V V mA mA mA V V MHz www.allegromicro.com 5 6275 8-BIT SERIAL-INPUT, CONSTANT-CURRENT LATCHED LED DRIVER TIMING REQUIREMENTS and SPECIFICATIONS (Logic Levels are VDD and Ground) C CLOCK A SERIAL DATA IN DATA tp SERIAL DATA OUT D LATCH ENABLE 50% 50% 50% B 50% DATA E OUTPUT ENABLE LOW = ALL OUTPUTS ENABLED tp OUT N HIGH = OUTPUT OFF 50% DATA LOW = OUTPUT ON Dwg. WP-029-1 HIGH = ALL OUTPUTS DISABLED (BLANKED) OUTPUT ENABLE 50% F t en(BQ) 90% t dis(BQ) tf DATA 10% tr OUT N Dwg. WP-030-1 A. Data Active Time Before Clock Pulse (Data Set-Up Time), tsu(D) .......................................... 60 ns B. Data Active Time After Clock Pulse (Data Hold Time), th(D) .............................................. 20 ns C. Clock Pulse Width, tw(CK) ............................................... 50 ns D. Time Between Clock Activation and Latch Enable, tsu(L) ............................................ 100 ns E. Latch Enable Pulse Width, tw(L) ................................... 100 ns F. Output Enable Pulse Width, tw(OE) ................................ 4.5 µs NOTE – Timing is representative of a 10 MHz clock. Significantly higher speeds are attainable. — Max. Clock Transition Time, tr or tf .............................. 10 µs Information present at any register is transferred to the respective latch when the LATCH ENABLE is high (serial-toparallel conversion). The latches will continue to accept new data as long as the LATCH ENABLE is held high. Applications where the latches are bypassed (LATCH ENABLE tied high) will require that the OUTPUT ENABLE input be high during serial data entry. When the OUTPUT ENABLE input is high, the output source drivers are disabled (OFF). The information stored in the latches 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. 6 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 6275 8-BIT SERIAL-INPUT, CONSTANT-CURRENT LATCHED LED DRIVER ALLOWABLE OUTPUT CURRENT AS A FUNCTION OF DUTY CYCLE A6275EA A6275ELW 100 VCE = 2 V 100 VCE = 1 V ALLOWABLE OUTPUT CURRENT IN mA/BIT ALLOWABLE OUTPUT CURRENT IN mA/BIT 80 VCE = 3 V VCE = 2 V 80 VCE = 3 V VCE = 4 V 60 60 VCE = 4 V 40 40 20 TA = +25°C VDD = 5 V RθJA = 60°C/W 20 TA = +25°C VDD = 5 V RθJA = 80°C/W 0 0 20 40 60 80 100 Dwg. GP-062-5 0 0 20 40 60 80 100 Dwg. GP-062-4 DUTY CYCLE IN PER CENT DUTY CYCLE IN PER CENT 100 VCE = 2 V 100 VCE = 1 V ALLOWABLE OUTPUT CURRENT IN mA/BIT ALLOWABLE OUTPUT CURRENT IN mA/BIT 80 VCE = 3 V 80 VCE = 3 V 60 VCE = 4 V VCE = 2 V 60 VCE = 4 V 40 40 20 TA = +50°C VDD = 5 V RθJA = 60°C/W 20 TA = +50°C VDD = 5 V RθJA = 80°C/W 0 0 20 40 60 80 100 Dwg. GP-062-3 0 0 20 40 60 80 100 Dwg. GP-062-2 DUTY CYCLE IN PER CENT DUTY CYCLE IN PER CENT www.allegromicro.com 7 6275 8-BIT SERIAL-INPUT, CONSTANT-CURRENT LATCHED LED DRIVER ALLOWABLE OUTPUT CURRENT AS A FUNCTION OF DUTY CYCLE (cont.) A6275EA A6275ELW 100 VCE = 1 V 100 VCE = 0.7 V ALLOWABLE OUTPUT CURRENT IN mA/BIT ALLOWABLE OUTPUT CURRENT IN mA/BIT 80 VCE = 2 V 80 VCE = 1 V VCE = 3 V 60 VCE = 4 V 40 VCE = 2 V 60 VCE = 3 V 40 VCE = 4 V 20 TA = +85°C VDD = 5 V RθJA = 60°C/W 20 TA = +85°C VDD = 5 V RθJA = 80°C/W 0 0 20 40 60 80 100 Dwg. GP-062-1 0 0 20 40 60 80 100 Dwg. GP-062 DUTY CYCLE IN PER CENT DUTY CYCLE IN PER CENT TYPICAL CHARACTERISTICS 60 OUTPUT CURRENT IN mA/BIT 40 20 TA = +25°C REXT = 500 Ω 0 0 0.5 1.0 VCE IN VOLTS Dwg. GP-063 1.5 2.0 8 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 6275 8-BIT SERIAL-INPUT, CONSTANT-CURRENT LATCHED LED DRIVER TERMINAL DESCRIPTION Terminal No. 1 2 3 4 5-12 13 14 15 16 Terminal Name GND SERIAL DATA IN CLOCK LATCH ENABLE OUT0-7 OUTPUT ENABLE SERIAL DATA OUT REXT SUPPLY Function Reference terminal for control logic. Serial-data input to the shift-register. Clock input terminal for data shift on rising edge. Data strobe input terminal; serial data is latched with high-level input. The eight current-sinking output terminals. When (active) low, the output drivers are enabled; when high, all output drivers are turned OFF (blanked). CMOS serial-data output to the following shift-register. An external resistor at this terminal establishes the output current for all sink drivers. (VDD) The logic supply voltage (typically 5 V). 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 products are not authorized for use as critical components in life-support devices or systems without express written approval. 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. www.allegromicro.com 9 6275 8-BIT SERIAL-INPUT, CONSTANT-CURRENT LATCHED LED DRIVER Applications Information The load current per bit (IO) is set by the external resistor (REXT) as shown in the figure below. 100 VCE = 0.7 V 80 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 provide supply voltages as low as 3.3 V. For reference, typical LED forward voltages are: 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 logicground and power-ground terminal. If ground pattern layout contains large common-mode resistance, and the voltage between the system ground and the LATCH ENABLE or CLOCK terminals exceeds 2.5 V (because of switching noise), these devices may not operate correctly. OUTPUT CURRENT IN mA/BIT 60 40 20 0 100 200 300 500 700 1k EXT 2k 3k 5k CURRENT-CONTROL RESISTANCE, R IN OHMS Dwg. GP-061 Package Power Dissipation (PD). The maximum allowable 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 PD(act) > PD(max), an external voltage reducer (VDROP) should be used. Load Supply Voltage (VLED). These devices are designed 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 significantly. To minimize package power dissipation, it is recommended to use the lowest possible load supply voltage or to set any series dropping voltage (VDROP) 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 VLED V DROP VF V CE Dwg. EP-064 10 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 6275 8-BIT SERIAL-INPUT, CONSTANT-CURRENT LATCHED LED DRIVER A6275EA Dimensions in Inches (controlling dimensions) 0.014 0.008 16 9 0.430 0.280 0.240 MAX 0.300 BSC 1 0.070 0.045 0.100 0.775 0.735 BSC 8 0.005 MIN 0.210 MAX 0.015 MIN 0.150 0.115 0.022 0.014 Dwg. MA-001-16A in Dimensions in Millimeters (for reference only) 16 9 0.355 0.204 10.92 7.11 6.10 MAX 7.62 BSC 1 1.77 1.15 2.54 19.68 18.67 BSC 8 0.13 MIN 5.33 MAX 0.39 MIN 3.81 2.93 0.558 0.356 Dwg. MA-001-16A mm NOTES: 1. Exact body and lead configuration at vendor’s option within limits shown. 2. Lead spacing tolerance is non-cumulative 3. Lead thickness is measured at seating plane or below. www.allegromicro.com 11 6275 8-BIT SERIAL-INPUT, CONSTANT-CURRENT LATCHED LED DRIVER A6275ELW Dimensions in Inches (for reference only) 16 9 0.0125 0.0091 0.2992 0.2914 0.419 0.394 0.050 0.016 0.020 0.013 1 2 3 0.4133 0.3977 0.050 BSC 0° TO 8° 0.0926 0.1043 0.0040 MIN. Dwg. MA-008-16A in Dimensions in Millimeters (controlling dimensions) 16 9 0.32 0.23 7.60 7.40 10.65 10.00 1.27 0.40 0.51 0.33 1 2 3 10.50 10.10 1.27 BSC 0° TO 8° 2.65 2.35 0.10 MIN. Dwg. MA-008-16A mm NOTES: 1. Exact body and lead configuration at vendor’s option within limits shown. 2. Lead spacing tolerance is non-cumulative. 12 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000