ST HCF4556B User Manual
1/9September 2001
■ EXPANDABLE WITH MULTIPLE PACKAGES
■ STANDARDIZED SYMMETRICAL OUTPUT
CHARACTERISTICS
■ QUIESCENT CURRENT SPECIFIED UP TO
20V
■ 5V, 10V AND 15V PARAMETRIC RAT INGS
■ INPUT LEAKAGE CURRENT
I
I
= 100nA (MAX) AT V
DD
= 18V T
A
= 25°C
■ 100% TESTED FOR QUIESCENT CURRENT
■
MEETS ALL REQUIREMENTS OF JEDEC
JESD13B " STANDARD SPECIF ICATIONS
FOR DESCRIPTI ON OF B SERI ES CMOS
DEVICES"
DESCRIPTION
The HCF4556B is a m onolithic integrated circuit
fabricated in Metal Oxide Semiconductor
technology available in DIP and SOP packages.
The HCF4556B is a dual 1 of 4 decoder/
demultiplexer. Each decoder has two select inputs
(A and B), an Enabl e input (E
), and four mutually
exclusive outputs. O n the HCF4556B the ou tputs
are low on select. When the Enable input is high,
the outputs is high regardless of the state of the
select inputs A and B.
HCF4556B
DUAL BINARY TO 1 OF 4 DECODER/DEMULTIPLEXER
OUTPUT LOW ON SELECT
PIN CONNECTION
ORDER CODES
PACKAGE TUBE T & R
DIP HCF4556BEY
SOP HCF4556BM1 HCF4556M013TR
DIP SOP
HCF4556B
2/9
IINPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
TRUTH TABLE
X : Don’t Care
FUNCTIONAL DIAGRAM
PIN No SYMBOL NAME AND FUNCTION
2, 3 A, B Select Inputs (1/2 of dual)
1E
Enable Input (1/2 of dual)
4, 5, 6, 7 Q0
to Q3 Outputs (1/2 of dual)
14, 13 A, B Select Inputs (1/2 of dual)
15 E
Enable Input (1/2 of dual)
12, 1 1, 10, 9 Q0
to Q3 Outputs (1/2 of dual)
8
V
SS
Negative Supply Voltage
16
V
DD
Positive Supply Voltage
INPUTS ENABLE SELECT OUTPUTS
E
BAQ3Q2 Q1 Q0
LLLHHHL
LLHHHLH
LHLHLHH
LHHLHHH
HXXHHHH
HCF4556B
3/9
LOGIC DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied.
All voltage values ar e referred t o V
SS
pin voltage.
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Value Unit
V
DD
Supply Voltage
-0.5 to +22 V
V
I
DC Input Voltage -0.5 to V
DD
+ 0.5
V
I
I
DC Input Current
± 10 mA
P
D
Power Dissipation per Package 200 mW
Power Dissipation per Output Transistor 100 mW
T
op
Operating Temperature
-55 to +125 °C
T
stg
Storage Temperature
-65 to +150 °C
Symbol Parameter Value Unit
V
DD
Supply Voltage
3 to 20 V
V
I
Input Voltage 0 to V
DD
V
T
op
Operating Temperature
-55 to 125 °C
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