DABiC-5 8-Bit Serial Input Latched Sink Drivers merged combinatio
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A6821
DABiC-5 8-Bit Serial Input Latched Sink Drivers
merged combination bipolar technology gives these devices interface flexibility beyond reach standard logic buffers power driver arrays. Typical applications include driving multiplexed displays incandescent lamps. A6821 eight-bit CMOS shift register CMOS control circuitry, eight CMOS data latches, eight bipolar current-sinking Darlington output drivers. CMOS inputs compatible with standard CMOS logic levels. circuits require appropriate pull-up resistors. using serial data output, drivers cascaded interface applications requiring additional drive lines. Package 16-pin Wide Body SOIC A6821SA furnished standard 16-pin plastic DIP. A6821EA 16-pin plastic DIP, capable operation from -40°C +85°C. A6821SLW 16-lead wide-body SOIC, surfacemount applications. These devices lead (Pb) free, with 100% matte plated leadframes.
Package 16-pin
FEATURES
logic supply range
ABSOLUTE MAXIMUM RATINGS
Output Voltage, VOUT Logic Supply Voltage, VDD.7 Input Voltage Range, .-0.3 +0.3 Continuous Output Current (each output), IOUT Package Power Dissipation, A6821SA/A6821EA.2.1 A6821SLW. Operating Temperature Range Ambient Temperature, .-20°C +85°C Storage Temperature, .-55°C +150°C Caution: CMOS devices have input-static protection, susceptible damage when exposed extremely high static-electrical charges.
Power reset (POR) data input rate CMOS, compatible -40°C operation available
Schmitt trigger inputs improved noise immunity Low-power CMOS logic latches High-voltage current-sink outputs Internal pull-up/pull down resistors
APPLICATIONS
Multiplexed displays Incandescent lamps
following complete part numbers when ordering:
Part Number A6821SA-T A6821EA-T A6821SLW-T Package 16-pin 16-pin 16-pin wide body SOIC Ambient
A6821
DABiC-5 8-Bit Serial Input Latched Sink Drivers
Functional Block Diagram
OUND
IAL-P ALLE
LOW) OLAR OUND
Typical Input Circuits
Typical Output Driver
STROBE OUTPUT ENABLE
CLOCK SERIAL DATA
www.allegromicro.com
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
A6821
DABiC-5 8-Bit Serial Input Latched Sink Drivers
ELECTRICAL CHARACTERISTICS1 Unless otherwise noted: 25°C, logic supply operating voltage
Characteristic
Output Leakage Current Collector-Emitter Saturation Voltage Input Voltage Input Resistance Serial Data Output Voltage Maximum Clock Frequency2 Logic Supply Current
Typ.
4.75 0.15
Symbol
ICEX VCE(SAT) VIN(1) VIN(0) VOUT(1) VOUT(0) IDD(1) IDD(0) tdis(BQ) ten(BQ) tp(STH-QL) tp(STH-QH) tp(CH-SQX)
Test Conditions
VOUT IOUT IOUT IOUT
Min.
Typ.
3.05 0.15
Max. Min.
Max.
Units
IOUT -200 IOUT output outputs off, through IOUT ±200
Output Enable-to-Output Delay Strobe-to-Output Delay Output Fall Time Output Rise Time Clock-to-Serial Data Delay
1Positive
(negative) current defined conventional current going into (coming specified device pin. 2Operation clock frequency greater than specified minimum value possible warranteed.
Truth Table
Serial Data Clock Input Input Shift Register Contents Serial Data Output
Logic Level High Logic Level Irrelevant Present State Previous State Output Enable Strobe
Latch Contents Strobe Input
Output Enable Input
Output Contents
www.allegromicro.com
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
A6821
DABiC-5 8-Bit Serial Input Latched Sink Drivers
Timing Requirements Specifications
(Logic Levels Ground)
CLOCK SERIAL DATA DATA
p(CH-SQX) SERIAL DATA STROBE
DATA
OUTPUT ENABLE
OUTP NABLE tp(STH-QH) tp(STH-QL)
DATA
HIGH OUTP BLANKE (DIS ABLE OUTPUT ENABLE
en(BQ) dis(BQ)
DATA
Description Data Active Time Before Clock Pulse (Data Set-Up Time) Data Active Time After Clock Pulse (Data Hold Time) Clock Pulse Width Time Between Clock Activation Strobe Strobe Pulse Width
Symbol tsu(D) th(D) tw(CH) tsu(C) tw(STH)
Time (ns)
NOTE: Timing representative clock. Higher speeds attainable; operation high temperatures will reduce specified maximum clock frequency. Powering-on with inputs state ensures that registers latches power-on state (POR). Serial Data present input transferred shift register logical logical transition CLOCK input pulse. succeeding CLOCK pulses, registers shift data information towards SERIAL DATA OUTPUT. SERIAL DATA must appear input prior rising edge CLOCK input waveform.
Information present register transferred respective latch when STROBE high (serial-to-parallel conversion). latches will continue accept data long STROBE held high. Applications where latches bypassed (STROBE tied high) will require that OUTPUT ENABLE input high during serial data entry. When OUTPUT ENABLE input high, output buffers disabled (OFF). information stored latches shift register affected OUTPUT ENABLE input. With OUTPUT ENABLE input low, outputs controlled state their respective latches.
www.allegromicro.com
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
A6821
DABiC-5 8-Bit Serial Input Latched Sink Drivers
Maximum Allowable Duty Cycle, IOUT
Number Outputs
A6821SA/A6821EA
100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100%
mbient emperature 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100%
100% 100% 100% 100% 100% 100% 100%
A6821SLW
Terminal List Table
Name Description Clock Serial Data Logic Ground* OUT8 OUT7 OUT6 OUT5 OUT4 OUT3 OUT2 OUT1 Logic Supply Serial Data Strobe Output Enable (active low) Power Ground* Serial Data Output Serial Data Output Serial Data Output Serial Data Output Serial Data Output Serial Data Output Serial Data Output Serial Data Output
There indeterminate resistance between logic ground power ground. proper operation, these terminals must externally connected together.
www.allegromicro.com
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
A6821
DABiC-5 8-Bit Serial Input Latched Sink Drivers
Package 16-pin
Package 16-pin Wide Body SOIC
CLOCK SERIAL DATA LOGIC GROUND LOGIC SUPPLY SERIAL DATA STROBE OUTPUT ENABLE POWER GROUND
OUND OUND
SHIFT REGISTER
LATCHES
www.allegromicro.com
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
A6821
DABiC-5 8-Bit Serial Input Latched Sink Drivers
Package
16-pin
Dimensions Inches (controlling dimensions)
0.014 0.008
0.430 0.280 0.240
0.300
0.070 0.045
0.100 0.775 0.735
0.005
0.210
0.015
0.150 0.115 0.022 0.014
Dwg. MA-001-16A
Dimensions Millimeters (for reference only)
0.355 0.204
10.92 7.11 6.10
7.62
1.77 1.15
2.54 19.68 18.67
0.13
5.33
0.39
3.81 2.93 0.558 0.356
Dwg. MA-001-16A
NOTES: Lead thickness measured seating plane below. Lead spacing tolerance non-cumulative. Exact body lead configuration vendor's option within limits shown.
www.allegromicro.com
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
A6821
DABiC-5 8-Bit Serial Input Latched Sink Drivers
16-pin Wide Body SOIC
Dimensions Inches (for reference only)
0.0125 0.0091
Package
0.2992 0.2914
0.419 0.394
0.050 0.016 0.020 0.013
0.4133 0.3977
0.050
0.0926 0.1043 0.0040 MIN.
Dwg. MA-008-16A
Dimensions Millimeters (controlling dimensions)
0.32 0.23
7.60 7.40
10.65 10.00
1.27 0.40 0.51 0.33
10.50 10.10
1.27
2.65 2.35 0.10 MIN.
Dwg. MA-008-16A
NOTES: Lead spacing tolerance non-cumulative. Exact body lead configuration vendor's option within limits shown.
www.allegromicro.com
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
A6821
DABiC-5 8-Bit Serial Input Latched Sink Drivers
products described here manufactured under more U.S. patents U.S. patents pending. Allegro MicroSystems, Inc. reserves right make, from time time, such departures from detail specifications required permit improvements performance, reliability, manufacturability products. Before placing order, user cautioned verify that information being relied upon current. Allegro products authorized critical components life-support devices systems without express written approval. information included herein believed accurate reliable. However, Allegro MicroSystems, Inc. assumes responsibility use; infringement patents other rights third parties which result from use.
Copyright©2004, 2005 AllegroMicrosystems, Inc.
www.allegromicro.com
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
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