Silan

Semiconductors

SC5272

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

7

4.LATCH OR MOMENTARY DATA OUTPUT TYPE

The SC5272 uses either the latch or momentary data output type depending on the SC5272 version used. The

latch type SC5272-LXactivates the data out during transmission and this data is sustained in the memory until

another data is inputted or entered. A momentary type(SC5272-MXon the other hand, activates the data out only

during transmission. In the momentary type, the data does not remain in the memory after the transmission is

completed. Please refer to the diagram below:

Data Words

Data Words

Data Output X

Data Output Y

Data Output X

Data Output Y

Din

Data Pins

(Momentary)

Data Pins

(Latch)

VT

T

T

OPERATION FLOW CHART

Decoder Without Data Output Pin

1. When the power is turned on, the SC5272 activates the Stand-By Mode.

2. It then search for signals, If there is no signal received, it remains in the Stand-By Mode; otherwise, the address

bits received are compared with the address configuration of the pins.

3. The VT goes high signifying the validation of transmission only when there are two continuous frames that

contain matched address bit; otherwise, VT will not be activated and the Stand-By Mode remains active.

4. Then , the address bits are again checked. Two continuous mismatches of the address bits would disable the VT

and make the Stand-By Mode active; otherwise, the address bits are continuous checked.

Power ON

Stand-By Mode

Singal IN ?

Address bits

match?

Address bits

match?

Activate VT

Address bits

still match?

Address bits

still match?

Disable VT

Yes

Yes

No

No

No

Yes

Yes

No

Yes

No

Decoder Without Data Output Pin