hef4042b NXP Semiconductors, hef4042b Datasheet - Page 2

• Manufacturer Part Number: hef4042b
• Description: Quadruple D-latch
• Manufacturer: NXP Semiconductors

Philips Semiconductors
DESCRIPTION
The HEF4042B is a 4-bit latch with four data inputs (D
D
complementary latch outputs (O
enable inputs (E
transferred to O
same state, either HIGH or LOW. O
D
When E
O
O
exclusive-OR input structure allows the choice of either
polarity for E
other enable input is active HIGH; with one enable input
LOW, the other enable input is active LOW.
January 1995
3
3
3
0
Quadruple D-latch
), four buffered latch outputs (O
as long as both E
and the information in the latch is stored.
to O
3
0
are always the complement of O
and E
0
and E
1
0
Fig.1 Functional diagram.
0
are different, D
to O
and E
1
0
. With one enable input HIGH, the
3
and E
while both E
1
). Information on D
1
remain in the same state.
0
0
to O
to D
0
to O
0
0
and E
to O
3
3
) and two common
do not affect O
3
), four buffered
3
0
1
follow D
to O
0
are in the
to D
3
. The
3
is
0
to
0
0
to
to
2
PINNING
APPLICATION INFORMATION
Some examples of applications for the HEF4042B are:
FAMILY DATA, I
See Family Specifications
HEF4042BP(N):
HEF4042BD(F):
HEF4042BT(D):
( ): Package Designator North America
D
E
O
O
Buffer storage
Holding register
0
0
0
0
and E
to D
to O
to O
3
3
3
1
data inputs
enable inputs
parallel latch outputs
complementary parallel latch outputs
DD
Fig.2 Pinning diagram.
LIMITS category MSI
16-lead DIL; plastic
16-lead DIL; ceramic (cerdip)
16-lead SO; plastic
(SOT38-1)
(SOT74)
(SOT109-1)
Product specification
HEF4042B
MSI