ACT15530CFB datasheet(3/15 Pages) AEROFLEX

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Aeroflex Circuit Technology

SCD15530 REV B 7/28/99 Plainview NY (516) 694-6700

Pin Designations

Input

Output

Enc

Dec

Function

Comment

Valid word

A 'high' signals the receipt of a valid word

Encoder Shift Clock

Shifts data into the encoder on a 'low' to 'high'

transition

Take Data

'high' during data reception after the sync pulse is

identified

Serial Data Out

NRZ output of received data

Decoder clock

Clock for the transition finder and synchronizer which

generates the clock for the rest of the decoder

Bipolar Zero In

Should be 'high' when the bus is in a negative state.

Must be tied 'high' when the unipolar input is used

Bipolar One In

Should be 'high' when the bus is in a positive state.

Must be tied 'low' when the unipolar input is used

Unipolar Data In

Input for unipolar data to the transition finder. Must be

tied 'low' when not used

Decoder Shift Clock

Provides the DECODER CLOCK divided by 12,

synchronized by the recovered serial data

Command/Data Sync

This output indicates the type of synchronizing

character received as follows: If a data synchronizing

character was received, this pin is low while the data

is decoded. If a command synchronizing character

was received, this pin is high during data decoding

Decoder Reset

A 'high' during a DECODER SHIFT CLOCK rising

edge resets the bit counter

–

VSS

Ground

Master Reset

A 'high" clears the counters in both sections

÷÷ 6 Out

Provides the ENCODER CLOCK divided by 6

Bipolar Zero Out

Provides an active 'low' output to the zero or negative

sense of a bipolar line driver

Output Inhibit

A 'low' inhibits the BIPOLAR ZERO OUT and

BIPOLAR ONE OUT by forcing them to inactive, 'high',

states

Bipolar One Out

Provides an active 'low' output to the one or positive

sense of a bipolar line driver

Serial Data In

Receives serial data at the rate of the ENCODER

SHIFT CLOCK

Encoder Enable

A 'high' starts the encode cycle provided that the

previous cycle is complete

Sync Select

A 'high' selects the command sync and a 'low' selects

the data sync

Send Data

Provides an active 'high' to enable the external serial

data source

Send Clock In

Clock input at 2 times the data rate

Encoder Clock

Input to the divide by 6 circuit

–

VDD

Positive Supply

Figure 4: Pin Designations (24-Pin Dip/FlatPack)

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