MultiCam Boards Documentation > DOMINO series Documentation > DOMINO Symphony Handbook > Board Specifications > DC/AC Characteristics > TTL System IO - IO1...IO4

TTL System IO - IO1...IO4

There are four digital non-isolated input/output ports in both external and internal system connector. The ports are named, IO1, IO2, IO3 and IO4.

The port is a singled-ended I/O port. The "warm wire" of the transmission line carrying the control signal has to be connected on the IOi pin and the "cold wire" of the transmission line has to be connected on any of the GND pins of the system connector.

SymphonyTTLSystemIOEqSch

TTL System IO

The port is configured as an input during the board initialization phase. The port is also protected against electrostatic discharges and is equipped with a HF noise filter.

Behavior

DC Characteristics

Inputs - DC characteristics

Min

Typ.

Max

Units

Input voltage range

0

 

5

V

Logic-0 input level

 

 

0.8

V

Logic-1 input level

2.0

 

 

V

input impedance - Pull-up resistor

 

4.7

 

Outputs - DC characteristics

Min

Typ.

Max

Units

Output voltage range

0

 

5

V

Logic-0 output level @IoI = 8 mA

 

 

0.4

V

Logic-0 output level @IoI = 16 mA

 

 

0.8

V

Logic-1 output level @IoI = -3 mA

3.0

 

 

V

Logic-1 output level @IoI = -24 mA

1.5

 

 

V