Quadruple R/S latch with 3-state outputs
The HEF4043B is a quadruple R/S latch with 3-state
outputs with a common output enable input (EO). Each
latch has an active HIGH set input (S0 to S3), an active
HIGH reset input (R0 to R3) and an active HIGH 3-state
output (O0 to O3).
When EO is HIGH, the state of the latch output (On) can be
determined from the function table below. When EO is
LOW, the latch outputs are in the high impedance
OFF-state. EO does not affect the state of the latch.
The high impedance off-state feature allows common
busing of the outputs.
Fig.2 Pinning diagram.
Fig.1 Functional diagram.
HEF4043BP(N): 16-lead DIL; plastic (SOT38-1)
HEF4043BD(F): 16-lead DIL; ceramic (cerdip) (SOT74)
HEF4043BT(D): 16-lead SO; plastic (SOT109-1)
( ): Package Designator North America
S0 to S3
R0 to R3
O0 to O3
common output enable input
set inputs (active HIGH)
reset inputs (active HIGH)
3-state buffered latch outputs
1. H = HIGH state (the more positive voltage)
L = LOW state (the less positive voltage)
X = state immaterial
Z = high impedance state
FAMILY DATA, IDD LIMITS category MSI
See Family Specifications