INPUT/OUTPUT DESCRIPTION:

CLOCK Input (Pin 1)

An external resistor connected between this input and

generates a clock which is used for all timing functions.

The recommended value of this resistor for 50Hz and

60Hz operation is specified in the ELECTRICAL CHAR-

ACTERISTICS. The resistor value determines the Bright-

ness Levels produced. (See Table 2)

SYNC Input (Pin 2)

50 or 60Hz AC input for zero crossing detection.

Supply voltage positive terminal.

TOUCH Input (Pin 4)

Input for sensing that a touch has been made

on a lamp surface or other touch plate.

CONTROL I/O (Pin 5)

An external R-C network connected between this pin

AGC Loop.

MODE Input (Pin 6)

A three-state input used to select the desired

Brightness Step Sequence (See Table 1).

Supply voltage negative terminal.

TRIG (Pin 8)

The TRIG output produces a negative going pulse eve-

ry half-cycle of the SYNC input to trigger the triac. The

delay, Td, of the pulse with respect to the SYNC signal

determines the Brightness Level produced.

(See Table 2 & Figure 2)

SYNC (Pin 2)

FIGURE 2. OUTPUT DELAY (Td)

Td

Td

TRIG (Pin 8)

ABSOLUTE MAXIMUM RATINGS:

PARAMETER

SYMBOL

VALUE

UNIT

DC supply voltage

+7

V

Any input voltage

V

Operating temperature

-20 to +85

°C

Storage temperature

-65 to +150

°C

The information included herein is believed to be

accurate and reliable. However, LSI Computer Systems,

Inc. assumes no responsibilities for inaccuracies, nor for

any infringements of patent rights of others which may

result from its use.

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