MT8808 Zarlink Semiconductor, MT8808 Datasheet - Page 3

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MT8808

Manufacturer Part Number
MT8808
Description
8 X 8 Analog Switch Array With Low On-resistance, For (VDD - VEE) = 4.5 V to 13.2 V
Manufacturer
Zarlink Semiconductor
Datasheet

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Functional Description
The MT8808 is an analog switch matrix with an array
size of 8 x 8. The switch array is arranged such that
there are 8 columns by 8 rows. The columns are
referred to as the Y inputs/outputs and the rows are
the X inputs/outputs. The crosspoint analog switch
array will interconnect any X I/O with any Y I/O when
turned on and provide a high degree of isolation
when turned off. The control memory consists of a 64
bit write only RAM in which the bits are selected by
the address inputs (AY0-AY2, AX0-AX2). Data is
presented to the memory on the DATA input. Data is
asynchro-nously written into memory whenever the
STROBE input is high and is latched on the falling
edge of STROBE. A logical “1” written into a memory
cell turns the corresponding crosspoint switch on
and a logical “0” turns the crosspoint off. Only the
crosspoint switches corresponding to the addressed
memory location are altered when data is written into
memory. The
previous states. Any combination of X and Y inputs/
outputs can be interconnected by establishing
appropriate
logical “1” on the RESET input will asynchronously
return all memory locations to logical “0” turning off
all crosspoint switches. Two voltage reference pins
(V
switching of negative analog signals. The range for
digital signals is from V
analog signals is from V
can be tied together if a single voltage reference is
needed.
SS
and V
EE
) are provided for the MT8808 to enable
patterns in the control memory.
remaining
DD
DD
to V
to V
switches
SS
EE
. V
while the range for
SS
and V
retain
EE
their
pins
A
Address Decode
The six address inputs along with the STROBE are
logically ANDed to form an enable signal for the
resettable transparent latches. The DATA input is
buffered and is used as the input to all latches. To
write to a location, RESET must be low while the
address and data are set up. Then the STROBE
input is set high and then low causing the data to be
latched. The data can be changed while STROBE is
high, however, the corresponding switch will turn on
and off in accordance with the DATA input. DATA
must be stable on the falling edge of STROBE in
order for correct data to be written to the latch.
ISO-CMOS
MT8808
3-17

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