GM6486 OUTPUT DRIVER GM6486 monolithic integrated circuit pr

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GM6486 OUTPUT DRIVER GM6486 monolithic integrated circuit pr

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GM6486
GM6486
OUTPUT DRIVER
GM6486 monolithic integrated circuit produced with high voltage CMOS technology. available 40-pin dual in-line plastic package. sin-gle controls display brightness setting reference current through variable resistor connect-ed separated supply 13.2V maximum.
Configuration
LOAD DATA CLOCK
Features
Output, 15mA Sink Capability Current Generator Outputs External
Resistros Required) Continous Brightness Control Serial Data Input-Output External Load Input Cascade operation capability Wide supply voltage range compatibility
GM6486
Block Diagram
BRIGHTNESS CONTROL 100K 750µ OUTPUT OUTPUT
DATA BRIGHTNESS CONTROL
View
PLCC
BIT170
BUFFES
OUTPUT
LOAD SERIAL DATA CLOCK
LATCHES DATA
SHIFT REGISTER
GM6486-44
Application
Microprocessor Displays Industrial control Indicator Relay Driver Instrumentation Readouts
BRIGHTNES CONTROL DATA
CLOCK
DATA
LOAD
GM6486 Absolute Maximum Rating SYMBOL
(off Ptot Tstg
PARAMETER
Supply Voltage Input Voltage State Output Voltage Output Sink Current Total Package Power Dissipation Junction Temperature Operating Temperature Range Storage Temperature Range
RATINGS
-0.3 -0.3
UNIT
Electrical Characteristics Tamb within operating range, =4.75V 13.2V unless otherwise specified)
SYMBOL PARAMETER Supply Voltage (off
Supply Current Input Voltage Logical Level Logical Level Brightness input current (Note Brightness input voltage (Pin State out. Voltage Output sink current (Note Segment Segment
TEST CONDITION =13.2V
Control Inputs ±10µA Input Bias
4.75
UNIT
13.2 1000
4.75 5.25 >5.25
-0.3
0.75
Input Current=750
13.2
(Note Bright Bright =100 Bright =750
Maximum Segment Current
GM6486
SYMBOL
Note:
PARAMETER Output Matching (Note Data Output Logical Level Logical Level Clock Input Frequency High Time Time Data Input Set-up time Hold time Data Enable Input Set-up time
TEST CONDITION 0.5mA 100µA (notes
UNIT
With fixed resistor brightness input, some variation brightness will occur from device another. Absolute maximum each output should limited voltage should regulated user. figures allowable versus operation. Output matching calculated percent variation (lmax+lmin)/2. input waveform specification test prupose: 20ns f=500kHz duty cycle Clock Input rise fall times must exceed 300ns.
Functional Description
GM6486 specifically designed operate digit displays with minimal interface with display data source. Serial data transfer from data source display driver accomplished with signals, serial data, clock load. data bits latched positive pulse, thus providing non-multiplexed direct drive display. Outputs change only serial data bits differ from previous time. Display brightness determined control output current drivers. capacitor should connected brightness control, prevent possible oscillation. block diagram shown figure output current typically times greater than current into which external variable resistor. There internal limiting resistor nominal value. Figure show input data format. first into data input will appear logical input will turn appropriate LED. LOAD signal latches shift registers into latches. data allows cascading shift registers more than output drivers. When power first applied chip internal power reset signal generated which resets registers latches. first clock return chip normal operation. Figure shows timing relationship between data, clock load. clock frequency 0.5MHz assumed. applications where less number outputs used, possible either increase current output operate part higher than following equation used calculation. [(Vo (No. segments)+(Vdd 7mA)](124 /W)+Tamb where junction temperature (+150 max) /W=thermal coefficient package =the voltage driver outputs Temb=ambient temperature =the current above equation used plot figure
GM6486
LEADING CLOCK CLOCK
LEADING CLOCK
DATA
LOAD reset Pulse RESET (INTERNAL) reset Pulse
leading clock necessary after power load signal high. reset pulse internal pulse that comes after power effective both shift register latches reset pulse internal pulse that comes load pulse- effective shift register only.
Fig. Data Input Format
CLOCK 300ns
RESET (INTERNAL)
Fig. Power Reset
CLOCK
DATA
LOAD
Fig. Timing Diagram
GM6486
Fig.
Plot SEGMENTS V0=1V 15mA/SEGMEN
SAFE OPERATING AREA
Fig.
20SEGM Tamb 85°C 150°C(MAX)
Fig.
(mA)
33SEGM 30SEGM
MAXIo=40mA
Tamb(
ILED (mA)
Typical Applications
Basic electronically turned Ratio system
SEGMENT GM6486 DISPLAY DRIVER
BOARD
ELECTRONIG UNIGNG CONTROLLER
SYNTHESIZER
STATION DETECT ETC.
GM6486 Typical Applications (Continued)
Duplexing Digits with GM6486
VLED VLED
9-15
2-8,
32-39
24-31
GM6486
CLOCK DATA BRIGHTNESS
CONTROL
LOAD
Power Dissipations
power dissipation limited using different configulation.
VOUT
GM6486
this application must chosen taking into account worst operating conditions. determined maximum number segment activated. VDMAX VOMIN NMax
worst case condition device when roughly half maximum number segments activated. must checked that total power dissipation does exceed absolute maximum ratings. critical cases more resistors used conjuction with groups segments. this case current variation single resistor reduced plot limited.
this configuration drop serial connected diodes quite stable diodes properly chosen. total power dissipation first approximation, depending only number segments activated.
VOUT+VD
this configuration VOUT+VD constant. total power dissipation depends only number segments activated.

GM6486 OUTPUT DRIVER GM6486 monolithic integrated circuit pr

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