Turning Ideas Into Reality ABCircuits www.abcircuits.com POB 123 New Hill NC 27562 (919) 290-7104 SIO7 IC Serial input/output IC for 7 bits of input and 7 bits of output General Description The SIO7 IC is designed to provide 7 bits of input and output data to connect to RS-232, USB, Ethernet or directly to your UART. Outputs can be used to drive relays, logic, optocouplers or a transistors. Inputs can be from switches, relay contacts, logic, optocouplers or a transistor switched to ground. The SIO7 has internal pull resistors on the inputs to minimize additional parts. The SIO7 IC transmits data anytime the inputs change or every of 100 mS. The serial format to the SIO7 is standard asynchronous format, using 8 bits, 1 stop and no parity at 9600 BPS. Other formats and encoding are available, contact the factory. A .1 uF bypass capacitor is suggested across the VDD and VSS pins. The part uses the standard 20 pin .3 inch width SOIC package. A full duplex data channel is required, do not use RS -485 or a half duplex data channel with this part. The SAIO7 IC may be used if your design requires a half duplex data channel. Features • Asynchronous serial control for 7 bits of input and 7 bits of output. • • • • • • • • • • • • • Can connect with RS-232, USB or Ethernet or UART. Inputs can be switches, relay contacts, optocouplers, and logic. On chip input pull up resistors on inputs. Outputs can be used to drive relays, transistors, optocouplers, and logic. Applications • Input Output Expansion • Remote control • Process control • Building Automation • Off site monitoring • Security systems • Internet of things • Machine control No external parts required. Low power consumption 5 mA typical. Supply voltage 2.4 to 5.25 volts. All timing internally generated. TTL and CMOS compatible outputs. Part is in full production. SOIC and DIP 20 Pin Package. ROHS Compliant Low EMI Part Number 74C922-SO Copyright © 2014 ABCircuits. Revised September 2014 Page 1 of 7 Turning Ideas Into Reality ABCircuits www.abcircuits.com POB 123 New Hill NC 27562 (919) 290-7104 Example Circuits 7 BITS INPUT/OUTPUT ETHERNET INPUT A2 INPUT A4 INPUT A6 OUTPUT A0 OUTPUT A2 OUTPUT A4 OUTPUT A6 +3.3 +3.3 1 2 3 4 5 6 7 8 SIO7 1 2 3 4 5 6 7 8 9 10 OUTPUT A5 OUTPUT A3 OUTPUT A1 INPUT A5 INPUT A3 INPUT A1 SINOA5 OA3 OA1 NC SOUTIA5 IA3 IA1 VSS VDD OA6 OA4 OA2 OA0 NC IA6 IA4 IA2 IA0 20 19 18 17 16 15 14 13 12 11 GND +3.3 -POR OUT IN CP1 CP2 CP3 ETHERNET LANTRONIX XPORT INPUT A0 VCC INPUT A2 INPUT A4 INPUT A6 OUTPUT A0 OUTPUT A2 OUTPUT A4 OUTPUT A6 C5 .1 1 3 C6 .1 4 5 VCC INPUT A5 INPUT A3 INPUT A1 INPUT A0 1 2 3 4 5 6 7 8 9 10 SINOA5 OA3 OA1 NC SOUTIA5 IA3 IA1 VSS VDD OA6 OA4 OA2 OA0 NC IA6 IA4 IA2 IA0 20 19 18 17 16 15 14 13 12 11 10 12 9 VCC V+ 2 C7 .1 6 C8 .1 C1C2+ V- C2T1in T1out T2in T2out R1out R1in R2out R2in GND OUTPUT A5 OUTPUT A3 OUTPUT A1 11 U2 SEE NOTES 14 7 13 8 RS232 DB9S J1 1 2 3 4 5 6 7 8 9 8 15 SIO7 C1+ VCC 16 7 BITS INPUT/OUTPUT RS-232 U2= MAX232 FOR 5V RS232 U2= MAX3232 FOR 3V RS232 Part Number SIO7 Copyright © 2014 ABCircuits. Revised September 2014 Page 2 of 7 TXD RXD GND Turning Ideas Into Reality ABCircuits www.abcircuits.com POB 123 New Hill NC 27562 (919) 290-7104 VCC 7 BITS INPUT/OUTPUT USB INPUT A2 INPUT A4 INPUT A6 OUTPUT A0 OUTPUT A2 OUTPUT A4 OUTPUT A6 .01 BEAD . 1 4.7 20 4 17 .1 VCC SIO7 OUTPUT A5 OUTPUT A3 OUTPUT A1 INPUT A5 INPUT A3 INPUT A1 SINOA5 OA3 OA1 NC SOUTIA5 IA3 IA1 VSS VDD OA6 OA4 OA2 OA0 NC IA6 IA4 IA2 IA0 20 19 18 17 16 15 14 13 12 11 15 CASE REFER TO FT232 DATASHEET FOR MORE DETAILS 19 27 28 8 24 USBM USBP -RST OSCI OSCO NC NC TXD RXD DTR -CTS RTS RI DSR DCD CBUS0 CBUS1 CBUS2 CBUS3 CBUS4 1 5 2 11 3 6 9 10 23 22 13 14 12 7 18 21 25 26 1 2 3 4 5 6 7 8 9 10 16 GND GND GND AGND TEST 1 2 3 4 5 VCC VCCIO 3VOUT USB FT232-SSOP INPUT A0 Connection Diagram SIO7 1 2 3 4 5 6 7 8 9 10 SINOA5 OA3 OA1 NC SOUTIA5 IA3 IA1 VSS VDD OA6 OA4 OA2 OA0 NC IA6 IA4 IA2 IA0 20 19 18 17 16 15 14 13 12 11 Pin Description Pin # 1 2 3 4 5 6 7 8 9 10 Description SINOA5 OA3 OA1 NC SOUTIA5 IA3 IA1 VSS Pin # 20 19 18 17 16 15 14 13 12 21 Description VDD OA6 OA4 OA2 OA0 NC IA6 IA4 IA2 IA0 OA0-6 These output bits are set when a byte is received on the SIN- pin, if bit 8 is a zero, otherwise they do not change. Output drivers may be required for high power loads. SINThis is the serial input pin. It may be tied directly to the UART transmitter output of your UART or microprocessor; to a RS -232 receiver such as the MAX232; an Ethernet interface such as the Lantronix Xport; or a USB IC such as the FT232. This pin is high in the idle state, the input format is 8 bits, 1 stop, no parity at 9600 BPS. Other formats and baud rates are available, please contact the factory for information. Bit 8 must be received as a zero or the byte will be ignored. The byte received on this pin will be transferred to the OA0-6 pins. Part Number SIO7 Copyright © 2014 ABCircuits. Revised September 2014 Page 3 of 7 Turning Ideas Into Reality ABCircuits www.abcircuits.com POB 123 New Hill NC 27562 (919) 290-7104 You can drive this input with any hexadecimal terminal program like REALTERM for testing and development. SOUTThis is the serial output pin. It may be tied directly to the UART receiver input of your UART or microprocessor; to a RS -232 driver such as the MAX232; an Ethernet interface such as the Lantronix Xport, or a USB IC such as the FT232. This pin is high in the idle state, the output format is 8 bits, 1 stop, no parity at 9600 BPS. Other output formats and baud rates are available, please contact the factory for information. Bit 8 of the transmitted byte is a zero. You can monitor this output with any hexadecimal terminal program like REALTERM. Hyperterm does not display in hexadecimal. IA0-6 These are the input bits that will be transmitted on the SOUT- pin when a change is detected, if no change is detected, they will be transmitted every 100 mS. These inputs have internal pull up resistors. VSS Connect to system ground. VDD Connect to supply voltage of 2.4 to 5 volts. A .1 uF decoupling capacitor to ground is recommended. NOTES: Make no connection to the NC pins. Pins 5 and 15 must be left unconnected. Serial Input Stream DATA STREAM START OUTPUT OA BITS OA0 OA1 OA2 OA3 OA4 OA5 OA6 0 STOP BIT CELLS When a byte is received on the SIN- pin the byte is placed on the OA pins. The eighth bit must be a zero or the byte is ignored. The SIO7 automatically removes start and stop bits from the data stream. The data is format is 9600 BPS, 8 bits, 1 stop, no parity. Part Number SIO7 Copyright © 2014 ABCircuits. Revised September 2014 Page 4 of 7 Turning Ideas Into Reality ABCircuits www.abcircuits.com POB 123 New Hill NC 27562 (919) 290-7104 Serial Output Stream DATA STREAM START INPUT IA BITS IA0 IA1 IA2 IA3 IA4 IA5 IA6 0 STOP BIT CELLS When the input bits on IA0-6 change, or the 100 mS delay times out, the SIO7 transmits one byte on the SOUT- pin. The bits from IA0-6 are transmitted, the eighth bit is a zero. The SIO7 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 Tstg Ta V dd V io Imio ESD Storage Temperature Operating Temperature LU Latch up current V dd - V ss Voltage Input Voltage Maximum current into any pin Electrostatic Discharge Voltage Min -55 -40 -0.5 Typical Max Units 25 +100 +85 +6.0 ºC ºC V V mA V Vss - 0.5 -25 2000 V dd +0.5 +50 200 Notes Human Body Model ESD mA DC Electrical Characteristics Symbol Description V dd Idd V oh V ol V ih V il Ioh Iol Cio Iil Rpu Supply Voltage Supply Current High Output Level Low Output Voltage Input High Level Input Low Level High Level Source Current Low Level Sink Current Capacitive load Input leakage Pull Up Resistors On Inputs IA0-6 Min Typical Max Units 5 5.25 8 V mA V V V V mA mA pF nA k? 2.4 V dd - 1.0 0.75 2.1 4 3.5 1 5.6 0.8 10 25 10 8 Notes Note 1 Ioh=10 mA Iol=25 mA Note 1: Vdd=5VDC, all inputs and outputs open Theory Of Operation The SIO7 IC is a custom programmed microprocessor designed to monitor a serial input/output stream. When a byte is received, bit 8 is checked. If bit 8 is zero, the byte is placed on the OA06 pins, otherwise the byte is ignored. Anytime an input IA0-6 changes, or the 100 mS timer expires, the part transmits the data on the IA0-6 pins. Bit 8 of the transmitted byte is a zero. Part Number SIO7 Copyright © 2014 ABCircuits. Revised September 2014 Page 5 of 7 Turning Ideas Into Reality ABCircuits www.abcircuits.com POB 123 New Hill NC 27562 (919) 290-7104 The data is standard asynchronous format 8 data bits, 1 stop bit and no parity. Baud rate is 9600 BPS. It is recommended that the OA0-6 byte be sent periodically even if there is no change, to recover from power failure or serial data errors. Part Number SIO7 Copyright © 2014 ABCircuits. Revised September 2014 Page 6 of 7 Turning Ideas Into Reality ABCircuits www.abcircuits.com POB 123 New Hill NC 27562 (919) 290-7104 Physical Dimensions – 20 Pin DIP (-DIP Suffix) Physical Dimensions – 20 Pin SOIC Close but not quite? Our products are software based, we can modify existing parts to fit your needs at a minimal cost or create new parts designed to your specifications. Email us and we can make a chip for you! For the latest version of this spec sheet, visit www.abcircuits.com Design Services Available We can quickly turn your idea into a chip, a pc board, or a finished product. Contact us with your needs and specifications. Part Number SIO7 Copyright © 2014 ABCircuits. Revised September 2014 Page 7 of 7