Chip pinoutpinout

Block diagram

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Absolute maximum ratings
Voltage on any pin except /RESET with respect to ground	-1.0 to +7.0V
Storage temperature	-40°C to 105°C
Maximum operating voltage	6.6 V
Maximum output pin current	40 mA
Maximum current Vcc to GND	140 mA
DC characteristics
Input low voltage (V)	-0,5...(0.2Vcc-0.1)
Input high voltage (V)	0.2Vcc+0.9...Vcc+0.5
Internal pull-up resistor	35...100 kohm
Output current: source	10 mA
Output current: sink	20 mA
Analog comparator offset	20 mV max
Analog comparator leakage current	10 nA max
Max clock frequency	10 MHz

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Chip pinout, dual-in-line plastic case.

pin name	description	pin #
/RESET	Chip hardware reset, active low. Must be kept low for 2 clock cycles minimum to ensure proper device reset.	1
RX, TX	Serial port input (RX) and output (TX) for chip monitoring and programming.	2, 3
XTAL2	Clock oscillator (drive pin)	4
XTAL1	Clock oscillator sense input / External 4 MHz clock input	5
REMOTE	Remote control decoder input	6
/ST0	State machine reset. Must be kept low for 10 mS minimum to ensure return to state st00.	7
IN1...IN2	State machine programmable digital inputs	8, 9
GND	0 volts power supply	10
IN3	State machine programmable digital input	11
IN4 (COMP)	State machine programmable digital input/ alternate positive input to the analog comparator (input IN4 = 1 when Vin > Aref)	12
AREF	Analog voltage reference input	13
/STOP	State machine stop, active low.	14
/HOLD	State machine timer hold, active low	15
OUT1...OUT4	State machine programmable digital outputs	16...19
Vcc	+5 volt dc power supply (can range from 4 to 6V)	20

State machine's truth table memory

The state machine truth table memory can hold up to(*) 32 different states, 64 input conditions, 6 remote control keys and 30 different timeouts. The truth table memory is loaded through the serial port. No explicit erase is required before writing (auto-erasing).Memory is non-volatile, retains data between power interruptions, and can be rewritten at least 1000 times. Each state includes up to 4 inputs, up to four outputs, and one remote control key.

(*) Maximum capacity, actual capacity varies based on truth table content.