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 VOH 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 VCC Operation (’HC4511)
4.5-V to 5.5-V VCC 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
High Noise Immunity, NIL or NIH = 30% of VCC at VCC = 5 V
Direct LSTTL Input Logic Compatibility, VIL = 0.8 V Maximum, VIH = 2 V Minimum