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| E2C0025-27-Y3 Semiconductor MSC7171 Semiconductor 12-Bit Grid Driver This version: Nov. 1997 MSC7171 Previous version: Jul. 1996 GENERAL DESCRIPTION The MSC7171 is a driver IC designed to directly drive the grids of fluorescent display tube. It contains a 12-bit shift register and 12 output drivers. Display data is serially written into the internal 12-bit shift register on the rising edge of each clock pulse. By setting the DUTY pin to "L", all driver outputs go "L". Blanking can be set using this function. By setting the STANDBY pin to "H", all driver outputs go "L" and the MSC7171 enters the low current mode. FEATURES * Logic supply voltage : 5 V * Driver supply voltage : 65 V * Driver output current IOH: -50 mA (Only one driver output is in the high state) IOL: 100 mA * Directly connectable to VF display tube: no pull-down resistor required * Data transfer cycle : 5 MHz * Brightness control through DUTY pin * Low-current mode can be set with STANDBY pin * Package: 24-pin plastic SOP (SOP24-P-430-1.27-K)(Product name: MSC7171GS-K) 1/7 Semiconductor MSC7171 BLOCK DIAGRAM V DISP V DD STANDBY DUTY DATA CLOCK C SI PO1 12-BIT S/R PO12 V SS GRID12 GRID 1 INPUT AND OUTPUT CONFIGURATION Input Circuit for Logic VDD VDD Input VSS VSS VSS Driver Output Circuit VDISP VDISP Output VSS VSS 2/7 Semiconductor PIN CONFIGURATION (TOP VIEW) CLOCK DATA STANDBY VSS NC GRID 1 GRID 2 GRID 3 GRID 4 NC GRID 5 GRID 6 1 2 3 4 5 6 7 8 9 10 11 12 MSC7171 24 23 22 21 20 19 18 17 16 15 14 13 DUTY VDD NC VDISP NC GRID 12 GRID 11 GRID 10 GRID 9 NC GRID 8 GRID 7 NC: No-connection pin 24-Pin Plastic SOP PIN DESCRIPTIONS Symbol CLOCK Type I Description Clock input of shift register. Data is clocked in this pin through DATA pin while this pin is at a "L" level. The data is shifted on the rising edge of the shift clock pulse. Serial data input into the shift register. Standby signal input By setting this pin to "H", all driver outputs go "L" and the IC enters the low current mode. Ground. High-withstand voltage driver output pins for driving vacuum fluorescent (VF) display tube. These pins can be connected directly to the grids of the VF display tube. No pull-down resistor is required. VF display tube driver power supply. Logic power supply. Duty control signal input. When this pin is set to "L", all driver outputs go "L", allowing this pin to be used for brightness control. DATA STANDBY I I VSS GRID1 to 12 -- O VDISP VDD DUTY -- -- I 3/7 Semiconductor MSC7171 ABSOLUTE MAXIMUM RATINGS Parameter Logic Supply Voltage Driver Supply Voltage Input Voltage Power Dissipation Attenuation Rate Storage Temperature *3 *1 *1,2 *1 Symbol VDD VDISP VIN PD Rj-a TSTG Condition Applicable to logic power pin Applicable to driver power pin Applicable to all the input pins Ta25C -- -- Rating -0.3 to +6.5 -0.3 to +70 -0.3 to VDD +0.3 790 158 -55 to +150 Unit V V V mW C/W C *1 *2 *3 Voltage for logic with respect to VSS Stresses beyond the "Absolute Maximum Ratings" may cause permanent damage to the device. Thermal resistance of the package (between junction and atmosphere) The junction temperature (Tj) expressed by the equation below must not exceed 150C. Tj=P Rj-a + Ta (P: Maximum power consumption of IC) RECOMMENDED OPERATING CONDITIONS Parameter Logic Supply Voltage Driver Supply Voltage High Level Input Voltage Low Level Input Voltage Driver High Level Output Current Driver Low Level Output Current Clock Frequency Data Setup Time Data Hold Time Pulse Width DUTY STANDBY Setup Time CLOCK-DUTY DUTY-CLOCK STANDBY-CLK Operating Temperature Symbol VDD VDISP VIH VIL IOH IOL fCLK tSU(D-CLK) tH(CLK-D) tw(DUTY) tw(STB) tSU(CLK-DUTY) tSU(DUTY-CLK) tSU(STB-CLK) Top Condition Applicable to logic power pin Applicable to driver power pin Applicable to all input pins Applicable to all input pins Applicable to all driver output pins Applicable to all driver output pins See Timing Diagram See Timing Diagram See Timing Diagram See Timing Diagram See Timing Diagram See Timing Diagram See Timing Diagram See Timing Diagram -- Min. 4.5 8 3.1 -- -- -- -- 30 30 100 100 100 100 100 -40 Max. 5.5 65 -- 1.7 -50 100 1 -- -- -- -- -- -- -- 85 Unit V V V V mA mA MHz ns ns ns ns ns ns ns C 4/7 Semiconductor MSC7171 ELECTRICAL CHARACTERISTICS DC Characteristics Parameter Logic Power Supply Symbol IDD1 IDD2 IDD3 Driver Power Supply High Level Input Current Low Level Input Current High Level Output Voltage Low Level Output Voltage IDISP1 IDISP2 IIH IIL VOH VOL (VDD=4.5 to 5.5 V,VDISP=8 to 65 V,Ta=-40 to +85C) Condition No load, one output H No load, DUTY=L No load, STANDBY=L No load, one output H No load, DUTY=L VDD=5.5 V,VIN=5 V VDD=5.5 V,VIN=0.5 V IOH=-50 mA IOL=100 mA Min. -- -- -- -- -- -- -- VDISP-4 -- Typ. -- -- -- -- -- -- -- -- -- Max. 0.5 0.5 50 0.2 1 1 1 -- 3 Unit mA mA mA mA mA mA mA V V AC Characteristics Parameter Delay Time LAEH Transient Time LAEH Delay Time HAEL Transient Time HAEL Symbol tDLH tTLH tDHL tTHL (VDD=4.5 to 5.5 V,VDISP=8 to 65 V,Ta=-40 to +85C) Condition Min. Typ. Max. Unit CL=10 pF CL=10 pF CL=10 pF CL=10 pF -- -- -- -- 0.3 2.0 0.3 2.0 1.0 4.0 1.0 4.0 ms ms ms ms TIMING DIAGRAM STANDBY tSU (STB-CLK) 50% tSU (D-CLK) tH (CLK-D) 50% tSU (CLK-DUTY) 50% tSU (DUTY-CLK) 50% 50% CLOCK DATA DUTY DUTY 50% tDLH 90% 50% tDHL 90% tTHL 10% GRID1 10% tTLH 5/7 Semiconductor MSC7171 FUNCTIONAL DESCRIPTION Function Table Shift register Input CLOCK DATA X L H L H PO1n PO1n PO1 Shift Register Parallel Out PO2 ... No Change ... ... PO10n PO10n PO11n PO11n PO11 PO12 X: Don't Care PO1n to PO11n: Data of PO1 to PO11 just before the CLOCK rises Driver output Input STANDBY H L L L DUTY X L H Shift Register Parallel Out POm X X L H Driver Output DRIDm L L L H Low Current Mode Normal Mode Normal Mode Normal Mode Operating Mode X: Don't Care m: 1 to 12 NOTES ON USE The contents of the shift register are undefined after power is turned on. Because of this, immediately after power is turned on, some drivers may go "H" to cause the VF display to flicker. To avoid this, first turn on the logic power while holding the STANDBY pin at "H", then turn on the driver power. After this, set the STANDBY pin to "L" and input data from the DATA pin, then set the DUTY pin to "H" to start for display. 6/7 Semiconductor MSC7171 PACKAGE DIMENSIONS (Unit : mm) SOP24-P-430-1.27-K Mirror finish Package material Lead frame material Pin treatment Solder plate thickness Package weight (g) Epoxy resin 42 alloy Solder plating 5 mm or more 0.58 TYP. Notes for Mounting the Surface Mount Type Package The SOP, QFP, TSOP, SOJ, QFJ (PLCC), SHP and BGA are surface mount type packages, which are very susceptible to heat in reflow mounting and humidity absorbed in storage. Therefore, before you perform reflow mounting, contact Oki's responsible sales person for the product name, package name, pin number, package code and desired mounting conditions (reflow method, temperature and times). 7/7 |
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