General Description

The CD4099BC is an 8-bit addressable latch with three

address inputs (A0–A2), an active low enable input (E),

active high clear input (CL), a data input (D), and eight outputs

(Q0–Q7).

Data is entered into a particular bit in the latch when that bit

is addressed by the address inputs and the enable (E) is

LOW. Data entry is inhibited when enable (E) is HIGH.

When clear (CL) and enable (E) are HIGH, all outputs are

LOW. When clear (CL) is HIGH and enable (E) is LOW, the

channel demultiplexing occurs. The bit that is addressed

has an active output which follows the data input while all

unaddressed bits are held LOW. When operating in the

addressable latch mode (E = CL = LOW), changing more

than one bit of the address could impose a transient wrong

address. Therefore, this should only be done while in the

memory mode (E = HIGH, CL = LOW).

Features

Wide supply voltage range: 3.0V to 15V

High noise immunity: 0.45 VDD (typ.)

Low power TTL: fan out of 2 driving 74L

compatibility: or 1 driving 74LS

Serial to parallel capability

Storage register capability

Random (addressable) data entry

Active high demultiplexing capability

Common active high clear