MM74C912N ,6-Digit BCD Display Controller/DriverFeaturesrequired. A self-contained internal oscillator sequentiallypresents the stored data to a de ..
MM74C912N ,6-Digit BCD Display Controller/DriverFunctional DescriptionCharacter FontSegment IdentificationThe MM74C912 display controller is manufa ..
MM74C912N ,6-Digit BCD Display Controller/Driverblock diagram, these display controllersthe V pin.CC contain six 5-bit registers; any one of which ..
MM74C912N ,6-Digit BCD Display Controller/DriverGeneral Descriptionpin labeled SEGMENT OUTPUT ENABLE, (SOE), is LOWThe MM74C912 display controllers ..
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MM74C912N
6-Digit BCD Display Controller/Driver
MM74C912 6-Digit BCD Display Controller/Driver October 1987 Revised January 1999 MM74C912 6-Digit BCD Display Controller/Driver typ.) output drivers. The drivers are active when the control General Description pin labeled SEGMENT OUTPUT ENABLE, (SOE), is LOW The MM74C912 display controllers are interface elements, and go into 3-STATE when SOE is HIGH. This feature with memory, that drive a 6-digit, 8-segment LED display. allows for duty cycle brightness control and for disabling The display controllers receive data information through 5 the output drivers for power conservation. data inputs A, B, C, D and DP, and digit information through The MM74C912 segment decoder converts BCD data into 3 address inputs K1, K2 and K3. 7-segment format. The input data is written into the register selected by the All inputs are TTL compatible and do not clamp to the V CC address information when CHIP ENABLE, (CE), and supply. WRITE ENABLE, (WE), are LOW and is latched when either CE or WE return HIGH. Data hold time is not Features required. A self-contained internal oscillator sequentially presents the stored data to a decoder where 4 data bits � Direct segment drive (100 mA typ.) 3-STATE control the format of the displayed character and 1 bit con- � 6 registers addressed like RAM trols the decimal point. The internal oscillator is controlled � Internal oscillator and scanning circuit by a control input labeled OSCILLATOR ENABLE, (OSE), � Direct base drive to digit transistor (20 mA typ.) which is tied LOW in normal operation. A high level at OSE prevents automatic refresh of the display. � Internal segment decoder The 7-segment plus decimal point output information � TTL compatible inputs directly drives an LED display through high drive (100 mA Ordering Code: Order Number Package Number Package Description MM74C912N N28B 28-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-010, 0.600” Wide Connection Diagram Dual-In-Line Package Top View © 1999 DS005916.prf
