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74C911 Arkusz danych(PDF) 2 Page - Fairchild Semiconductor |
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74C911 Arkusz danych(HTML) 2 Page - Fairchild Semiconductor |
2 / 8 page www.fairchildsemi.com 2 Truth Tables Input Control Output Control R = Refresh (digit lines sequentially pulsed) X = Don’t Care Functional Description The MM74C911 display controller is manufactured on stan- dard metal gate CMOS technology. A single 5V 74 series TTL supply can be used for power and should be bypassed at the VCC pin to suppress current transients. The digit outputs directly drive the base of a grounded emitter digit transistor without the need of a Darlington con- figuration. If an MM74C911 is driving a digit transistor and also supplying digit information to a cascaded MM74C911, base resistors are needed in the digit transistors to provide an adequate high level to the digit inputs of the cascaded MM74C911. As seen in the Block Diagram, these display controllers contain four 8-bit registers; any one may be randomly writ- ten into. In normal operation, the internal multiplexer scans the registers and refreshes the display. In cascaded opera- tion, 1 MM74C911 serves as a master refresh device and cascaded MM74C911’s are slaved to it through digit lines operating as inputs. The MM74C911 appears to a microprocessor as memory and to the user as a self-scan display. Since every seg- ment is under microprocessor control, great versatility is obtained. Low power standby operation occurs with both SOE and DIO inputs HIGH. This condition forces the MM74C911 to a quiescent state typically drawing less than 1 µA of supply current with a standby supply voltage as low as 3V. Logic Diagram Digit CE Address WE Operation K2 K1 0 0 0 0 Write Digit 1 0 0 0 1 Latch Digit 1 0 0 1 0 Write Digit 2 0 0 1 1 Latch Digit 2 0 1 0 0 Write Digit 3 0 1 0 1 Latch Digit 3 0 1 1 0 Write Digit 4 0 1 1 1 Latch Digit 4 1 X X X Disable Writing DIO SOE Digit Lines Operation D4 D3 D2 D1 0 0 RRRR Refresh Display 0 1 RRRR Disable Segment Outputs 1 0 0000 Digits Are Now Inputs 1 0 0001 Display Digit 1 1 0 0010 Display Digit 2 1 0 0100 Display Digit 3 1 0 1000 Display Digit 4 1 1 0000 Power Saver Mode |
Podobny numer części - 74C911 |
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Podobny opis - 74C911 |
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