1 Features
• 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 IC's
• 'HC4511
– High noise immunity,
NIL or NIH = 30% of VCC at VCC = 5 V
• CD74HCT4511
– Direct LSTTL input logic compatibility, VIL = 0.8
V Maximum, VIH = 2 V minimum
– CMOS input compatibility, II ≤ 1μA at VOL, VOH

2 Description
The CD54HC4511, CD74HC4511, and
CD74HCT4511 are BCD-to-7 segment latch/decoder/
drivers with four address inputs (D0−D3), an activelow
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.