CD74HC4511 - High Speed CMOS Logic BCD-to-7 Segment Latch/Decoder/Driver

The CD54HC4511, CD74HC4511, and CD74HCT4511 are BCD-to-7 segment latch/decoder/drivers with four address inputs (D₀–D₃), an active-low blanking (BL)\ input, lamp-test (LT)\ input, and a latch-enable (LE)\ input that, when high, enables the latches to store the BCD inputs. When LE\ is low, the latches are disabled, making the outputs transparent to the BCD inputs.

These devices have standard-size output transistors, but are capable of sourcing (at standard V_OH levels) up to 7.5 mA at 4.5 V. The HC types can supply up to 10 mA at 6 V.

• 2-V to 6-V V_CC Operation (’HC4511)
• 4.5-V to 5.5-V V_CC Operation (CD74HCT4511)
• High-Output Sourcing Capability
  • 7.5 mA at 4.5 V (CD74HCT4511)
  • 10 mA at 6 V (’HC4511)
• Input Latches for BCD Code Storage
• Lamp Test and Blanking Capability
• Balanced Propagation Delays and Transition Times
• Significant Power Reduction Compared to LSTTL Logic ICs
• ’HC4511
  • High Noise Immunity, N_IL or N_IH = 30% of V_CC at V_CC = 5 V
• CD74HCT4511
  • Direct LSTTL Input Logic Compatibility, V_IL = 0.8 V Maximum, V_IH = 2 V Minimum
  • CMOS Input Compatibility, I_I 1 µA at V_OL, V_OH