HCC40108B

HCF40108B

September 1988

4 x 4 MULTIPORT REGISTER

EY

(Plastic Package)

DESCRIPTION

ORDER CODES :

HCC40108BF

HCF40108BM1

HCF40108BEY

HCF40108BC1

F

(Ceramic Package)

M1

(Micro Package)

C1

(Chip Carrier)

PIN CONNECTIONS

The HCC40108B (extended temperature range)

and HCF40108B (intermediate temperature range)

are monolithic integrated circuits, available in 24

lead dual in line plastic or ceramic packageand plas-

tic micropackage. The HCC/HCF40108B is a 4 X 4

multiport register containing four 4-bit register, 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, independently of the clock, to a high im-

pedance state. The high impedance third state pro-

vides the outputs with the capability of being

connected to the bus lines in a bus organized sys-

tem without the need for interface or pull-up compo-

nents. When the WRITE ENABLE input is high, all

data input lines are latched on the positive transition

of the CLOCK and the data is entered into the word

selected by the write address lines. When WRITE

ENABLE is low, the CLOCK is inhibited and

.

FOUR 4-BIT REGISTERS

.

ONE INPUT AND TWO OUTPUT BUSES

.

UNLIMITED EXPANSION IN BIT AND WORD

DIRECTION

.

DATA LINES HAVE LATCHED INPUTS

.

3-STATE OUTPUTS

.

SEPARATE

CONTROL

OF

EACH

BUS,

ALLOWING SIMULTANEOUS INDEPENDET

READING AND ANY OF FOUR REGISTERS

ON BUS A AND BUS B AND INDEPENDENT

WRITING INTO ANY ANY OF THE FOUR REG-

ISTERS

.

40108B IS PIN COMPATIBLE WITH INDUSTRY

TYPE MC14580

.

STANDARDIZED, SYMMETRICAL OUTPUT

CHARACTERISTICS

.

QUIESCENT CURRENT SPECIFIED AT 20V

FOR HCC DEVICE

.

5V, 10V AND 15V PARAMETRIC RATINGS

.

INPUT CURRENTOF 100 nA AT 18V AND 25oC

FOR HCC DEVICE

.

100% TESTED FOR QUIESCENT CURRENT

.

MEETS ALL REQUIREMENTS OF JEDEC TEN-

TATIVE STANDARD No 13a, ”STANDARD

SPECIFICATIONS FOR DESCRIPTION OF B

SERIES CMOS DEVICES”

no new data is netered. In either case, the contents

of any word may be accessed via the read address

lines independent of the state of the CLOCK input.

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