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.