Turning Ideas Into Reality

ABCircuits www.abcircuits.com POB 123 New Hill NC 27562 (919) 290-7104

Part Number SIOA7

Copyright © 2014 ABCircuits. Revised September 2014 Page 8 of 10

Serial Input Stream

STOP

OA2

ADR2

OA5

0

ADR0

ADDRESS BYTE

OA6

OA3

START

ADR3

OA1

STOP

0

ADR1

OUTPUT OA BITS

BIT CELLS

OA0

0

START

DATA STREAM

1

OA4

0

When a byte is received on the SIN- pin, bit 8 is checked. If bit 8 is 1 and bits 7,6, and 5 are zero

the lower 4 bits are compared to the ADR0-3 pins. If that also matches, the next byte received on

the SIN- pin is placed on the OA0-6 pins if bit 8 of that byte is zero. The SIOA7 automatically

removes start and stop bits from the data stream. The data is format is 9600 BPS, 8 bits, 1 stop,

no parity. After the data is placed on the OA0-6 pins, the RXP pin generates a positive pulse.

The bits on IA0-6 are then transmitted, with the eighth bit being sent as a zero.

Serial Output Stream

STOP

INPUT IA BITS

START

BIT CELLS

IA1

IA6

IA3

IA4

IA2

IA5

0

IA0

After a valid matching address byte, and the next byte for the OA0-6 pins are received, the bits

from IA0-6 are transmitted on the SOUT- pin. Bit 8 is transmitted as a zero. The SIOA7

automatically adds start and stop bits to the data stream. The data is transmitted at 9600 BPS, 8

bits, 1 stop, no parity.

Absolute Maximum Ratings

Symbol

Description

Min

Typical

Max

Units

Notes

Storage Temperature

-55

25

+100

ºC

Operating Temperature

-40

+85

ºC

-0.5

+6.0

V

Input Voltage

V

Maximum current into any pin

-25

+50

mA

ESD

Electrostatic Discharge Voltage

2000

V

Human Body Model

ESD

LU

Latch up current

200

mA

DC Electrical Characteristics

Symbol

Description

Min

Typical

Max

Units

Notes

Supply Voltage

2.4

5.25

V

Supply Current

5

8

mA

Note 1

High Output Level

V

Low Output Voltage

0.75

V

Input High Level

2.1

V

Input Low Level

0.8

V

High Level Source Current

10

mA