CD74HCT4543 - High Speed CMOS Logic BCD-to-7 Segment Latch/Decoder/Driver for LCDs

The CD74HCT4543 high-speed silicon-gate is a BCD-to-7 segment latch/decoder/driver designed primarily for directly driving liquid-crystal displays. While the latch enable (LD) is low, the latches are enabled to store the BCD inputs. When the latch enable is high, the latches are disabled, making the outputs transparent to the BCD inputs. The device has an active-high blanking input (BI) and a phase input (PH) to which a square wave is applied for liquid-crystal applications. This square wave also is applied to the backplane of the liquid-crystal display.

• 4.5-V to 5.5-V V_CC Operation
• Input Latches for BCD Code Storage
• Blanking Capability
• Phase Input for Complementing Outputs
• Fanout (Over Temperature Range)
  • Standard Outputs - 10 LSTTL Loads
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL Logic ICs
• Direct LSTTL input logic compatibility, V_IL=0.8 V Maximum, V_IH=2 V Minimum
• CMOS Input Compatibility, I_I 1µA @ V_OL, V_OH