GM6486 HYNIX | Alldatasheet

Document overview

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Technical content

Features

l 33 Output, 15mA Sink Capability l Current Generator Outputs (No External Resistros Required) l Continous Brightness Control l S erial Data Input - Output l External Load Input l Cascade operation capability l Wide supply voltage range l TTL compatibility Block Diagram Application l Microprocessor Displays l Industrial control Indicator l Relay Driver l Instrumentation R eadouts Pin Configuration

40 PIN DIP

44 PIN PLCC

33 OUTPUT

33 LATCHES

33 BIT SHIFT REGISTER

CONTROL OUTPUT BIT 33 OUTPUT BIT 1 SERIAL DATA LOAD CLOCK DATA OUT InF V DD 750 µ 100K Ω TYP

1 V SS

SYMBOL PARAME TER RATINGS UNIT DDV Supply Voltage - 0.3 to 15 V INV Input Voltage - 0.3 to 15 V )off(V O Off State Output Voltage 15 V OI Output Sink Current 40 mA 1 (at 25 C° ) W totP Tot al Package Power Dissipation 560 (at 85 C° ) mW jT Junction Temperature 150 C° opT Operating Temperature Range - 25 to 85 C° stgT Storage Temperature Range - 65 to 150 C°

Electrical Characteristics

( ambT within operating range, DDV =4.75V to 13.2V SSV =0, unless otherwis e specified) SYMBOL PARAMETER TEST CONDITION MIN TYP MAX UNIT DDV Supply Voltage 4.75 13.2 V DDI Supply Current DDV =13.2V All Control Inputs at SSV =0V 50 1000 Aµ ILV IHV Input Voltage Logical “ 0 ” Level Logical “ 1 ” Level A10 µ± Input Bias 25.5V75.4 DD ≤≤ DDV >5.25 - 0.3 2.2 DDV - 2 0.8 DDV DDV V V V bI Brightness input current (Note 1) 0.75 mA bV Brightness input voltage (Pin 19) Input Current=750 Aµ 3 4.3 V )off(V O Off State out. Voltage 13.2 V OHI OLI Output sink current (Note 2) Segment off Segment on V3V o = V1V o = (Note 3) Bright in =0 A µ Bright in =100 Aµ Bri ght in =750 Aµ 2.7 Aµ Aµ mA mA OI Maximum Segment Current 40 mA

SYMBOL PARAMETER TEST CONDITION MIN TYP MAX UNIT MO Output Matching (Note 4) 20± % OLV OHV Data Output Logical “ 0 ” Level Logical “ 1 ” Level mA5.0I OUT = A100I OUT µ= SSV 2.4 0.4 DDV V V Cf th lt Clock Input Frequency High Time Low Time (notes 5 and 6) 950 950

500 KHz

Note: 1. With a fixed resistor on the brightness input, some variation in brightness will occur from one device to another. 2. Absolute maximum for each output should be limited to 40 mA. 3. The oV voltage should be regulated by the user. See figures 6 and 7 for allowable oV versus oI operation. 4. Output matching is calculated as the percent variation (lmax+lmin)/2. 5. AC input waveform specification for tes t prupose: ns20t r ≤ . ns20t f ≤ . f=500kHz ± 10% duty cycle 6. Clock Input rise and fall times must not exceed 300ns. Functional Description The GM6486 is specifically designed to operate 4 digit displays wit h minimal interface with the display and the data source. Serial data transfer from the data source to the display driver is accomplished with 3 signals, serial data, clock and load. The 33 data bits are latched by a positive pulse, thus providing non - mul tiplexed direct drive to the display. Outputs change only if the serial data bits differ from the previous time. Display brightness is determined by con - trol of the output current of LED drivers. A 1nF capacitor should be connected to brightness control, p in 19, to prevent possible oscillation. A block diagram is shown in figure 1. The output current is typically 20 times greater than the current into pin 19, which is set by an external variable resistor. There is an internal limiting resistor of 400 Ω nominal value. Figure 2 and 3 show the input data format. Bit “ 1 ” is the first bit into the data input pin and it will appear on pin 17. A logical “ 1 ” at the input will turn on the appropriate LED. The LOAD signal latches the 33 bit of the shift registers into the latches. The data out pin allows for cascading the shift registers for more than 33 output drivers. When power is first applied to the chip an internal power ON reset signal is generated which resets all registers and all latches. The first clock return the chip to its normal operation. Figure 4 shows the timing relationship between data, clock and load. A max clock frequency of 0.5MHz is assumed. For applications where less number of outputs are used, it is possible to either incre ase the current per output or operate the part at higher than 1V oV . The following equation can be used for calculation.

  • •= )I()V[(T LEDoj (No. of segments)+(Vdd × 7mA)](124 C° /W)+Tamb where =jT junction temperature (+150 C° max) 124 C° /W=thermal coefficient of package oV =the voltage at the LED driver outputs Temb=ambient temperature LEDI =t he LED current The above equation was used to plot figure 5, 6 and 7.
  • leading clock is necessary after power on and load signal high.
  • reset pulse 1: internal pulse that comes after power on — effective on both shift register and latches
  • reset pulse 2: internal pulse that comes load pulse — effective on shift register only. Fig. 2. Data Input Format Fig. 3. Power On Reset Fig. 4. Timing Diagram CLOCK LEADING CLO CK LEADING CLOCK DATA LOAD RESET (INTERNAL) BIT 1 BIT 2 BIT 32 BIT 33 BIT 1 reset Pulse 1 reset Pulse 2 VDD CLOCK RESET (INTERNAL) 300ns MIN CLOCK DATA LOAD rt th ft lt dht dst dest 1 2 1 32 33

Fig. 5 Fig. 6 Fig. 7 Typical Applications Basic electronically turned Ratio or TV system AM FM GM6486 DISPLAY DRIVER ELECTRONIG UNIGNG CONTROLLER KEY BOARD PLL SYNTHESIZER

33 SEGMENT

DETECT ETC. Plot (W) 0.8 0.6 0.4 0.2 0 20 40 60 0 4 8 12 16 20 0.6 1.2 1.8 2.4 24 0 4 8 12 16 20 24 28 32 oV oI (mA) Tamb ( C° ) LEDI °N(mA) Se SAFE OPERATING AREA 20SEGM 33SEGM 30SEGM C°85=Tamb )MAX(C°150=T j V5.1=V o V1=V o V2=V o

33 SEGMENTS

V0=1V 15mA/SEGMEN T MAXIo=40mA

Typical Applications (Continued) Duplexing 8 Digits with one GM6486 Power Dissipations of the IC The power dissipation of the IC can be limited by using different configulation. 9 - 15 2 - 8, 40 32 - 39 24 - 31 GM6486 16 21 22 19 20 1 23 17 V CC V LED V LED V DD V DD LOAD DATA IN CLOCK IN BRIGHTNESS CONTROL V C V OUT V D ID

In this application R must be chosen taking into account the worst operating conditions. R is determined by the maximum number of segment activated. DMax OMINDMAXC I•N VVV=R The worst case condition for the device is when roughly half of the m aximum number of segments are activated. It must be checked that the total power dissipation does not exceed the absolute maximum ratings. In critical cases more resistors can be used in conjuction with groups of segments. In this case the current variatio n in the single resistor is reduced and plot limited. In this configuration the drop on the serial connected diodes is quite stable if the diodes are properly chosen. The total power dissipation of the ICs is, in first approximation, depen ding only on the number of segments activated. In this configuration V OUT +V D is constant. The total power dissipation of the IC depends only the number of segments activated. V C V C V OUT +V D