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HCF40208 Datasheet(PDF) 1 Page - STMicroelectronics

No. de pieza HCF40208
Descripción Electrónicos  4 x 4 MULTIPORT REGISTER
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

HCF40208 Datasheet(HTML) 1 Page - STMicroelectronics

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HCC/HCF40208B
June 1989
4 x 4 MULTIPORT REGISTER
DESCRIPTION
.
FOUR 4-BIT REGISTERS
.
ONE INPUT AND TWO OUTPUT BUSES
.
UNLIMITED EXPANSION IN BIT AND WORD
DIRECTIONS
.
DATA LINES HAVE LATCHED INPUTS
.
3-STATE OUTPUTS
.
SEPARATE
CONTROL
OF
EACH
BUS,
ALLOWING SIMULTANEOUS INDEPENDENT
READING OF ANY OF FOUR REGISTERS ON
BUS A AND BUS B AND INDEPENDENT WRIT-
ING INTO ANY OF THE FOUR REGISTERS
.
40108B IS PIN-COMPATIBLE WITH INDUS-
TRY TYPE MC14580
.
STANDARDIZED, SYMMETRICAL OUTPUT
CHARACTERISTICS
.
QUIESCENT CURRENT SPECIFIED AT 20V
FOR HCC DEVICE
.
5V, 10V, AND 15V PARAMETRIC RATINGS
.
INPUT CURRENT OF 100nA AT 18V AND 25
°C
FOR HCC DEVICE
.
100% TESTED FOR QUIESCENT CURRENT
.
MEETS ALL REQUIREMENTS OF JEDEC TEN-
TATIVE STANDARD N
°13A, ”STANDARD SPE-
CIFICATIONS FOR DESCRIPTION OF ”B”
SERIES CMOS DEVICES”
BEY
(Plastic Package)
BF
(Ceramic Frit Seal Package)
BM1
(Micro Package)
ORDER CODES :
HCC40208BF
HCF40208BEY
HCF40208BM1
PIN CONNECTIONS
The HCC40208B (extended temperature range) and
HCF40208B (intermediate temperature range) are
monolithic integrated circuits, available in 24-lead dual
in-line plastic or ceramic package and plastic micro
package. The HCC/HCF40208B is a 4 x 4 multiport
register containing four 4-bit registers, write address
decoder, two separate read address decoders, and
two 3-state output buses. When the ENABLE input is
low, the corresponding output bus is switched, inde-
pendently of the clock to a high-impedance state. The
high-impedance third state provides the outputs with
the capability of being connected to the bus lines in a
bus-organized system without the need for interface or
pull-up components. When the WRITE ENABLE input
is high, all data input lines are latched on the positive
transition of the CLOCKand the data is entered into the
wordselected bythewrite address lines. When WRITE
ENABLE is low, the CLOCK is inhibited and no new
data is entered. In either case, the contents of any word
may be accessed via the read address lines inde-
pendent of the state of the CLOCK input.
1/13


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