MM74C911N , 4-Digit Expandable Segment Display ControllerGeneral Descriptiontor when the control pin labeled DIGIT INPUT OUTPUT,The MM74C911 display control ..
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MM74C911N
4-Digit Expandable Segment Display Controller
MM74C911 4-Digit Expandable Segment Display Controller October 1987 Revised January 1999 MM74C911 4-Digit Expandable Segment Display Controller The digit outputs directly drive the base of the digit transis- General Description tor when the control pin labeled DIGIT INPUT OUTPUT, The MM74C911 display controller is an interface element DIO, is LOW. When DIO is HIGH, the digit lines turn into with memory that drives a 4-digit, 8-segment LED display. inputs and the internal scanning multiplexer is disabled. The MM74C911 allows individual control of any segment in When any digit line is forced HIGH by an external device, the 4-digit display. The number of segments per digit can usually another MM74C911, the data information for that be expanded without any external components. For exam- digit is presented to the output. In this manner, 16-segment ple, two MM74C911’s can be cascaded to drive a 16-seg- alpha-numeric displays, 24- or 32-segment displays, or an ment alpha-numeric display. array of discrete LED's can be controlled by the simple cas- The display controllers receive data information through 8 cading of expandable segment display controllers. All data lines a, b…DP, and digit information through 2 inputs except digit inputs are TTL compatible and do not address inputs K1 and K2. The input data is written into the clamp input voltages above V . CC register selected by the address information when CHIP ENABLE, CE, and WRITE ENABLE, WE, are LOW and is Features latched when either CE or WE return HIGH. Data hold time is not required. � Direct segment drive (100 mA typ.) 3-STATE A self-contained internal oscillator sequentially presents � 4 registers addressed like RAM the stored data to high drive (100 mA typ.) 3-STATE output � Internal oscillator and scanning circuit drivers which directly drive the LED display. The drivers are � Direct base drive to digit transistor active when the control pin labeled SEGMENT OUTPUT � Segment expandability without external components ENABLE, SOE, is LOW and go into 3-STATE when SOE is HIGH. This feature allows for duty cycle brightness control, � TTL compatible inputs or for disabling the output drive for power conservation. � Power saver mode—5 μW (typ.) Ordering Code: Order Number Package Number Package Description MM74C991N N28B 28-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS−010, 0.600” Wide Connection Diagram Pin Assignments for DIP Top View © 1999 DS005915.prf
