TTL Input/5 V CMOS Output

Applies to Closed3612 HD26F I/O Extension Module - TTL-CMOS5V-RS422.

TTL Input/5 V CMOS Output Simplified schematic

The port implements a 5 V CMOS driver and a TTL-compliant receiver.

DC characteristics

Parameter Conditions Min. Typ. Max. Units
ESD protection Human Body Model (HBM) 2     kV

The I/O port includes a latch-up protection.

Driver

Parameter Conditions Min. Typ. Max. Units
Absolute maximum voltage rating   0   5 V
Low-level output current       24 mA
Low-level output voltage @50µA   0.001 0.1 V
@ 24 mA     0.81 V
High-level output current       -24 mA
High-level output voltage @-50 µA; (1) 4.9 4.99   V
@-24 mA; (1) 3.89     V

Condition (1): 300 Ohms line termination resistor to GND.

Receiver

Parameter Conditions Min. Typ. Max. Units
Absolute maximum voltage rating   0   5 V

AC characteristics

Driver

Parameter Conditions Min. Typ. Max. Units
Pulse width   500     ns
Pulse rate   0   1 MHz
10%-90% rise/fall time     TBD   ns

Receiver

Parameter Conditions Min. Typ. Max. Units
Pulse width   500     ns
Pulse rate   0   1 MHz
10%-90% rise/fall time     TBD   ns

Logical Map

The state of the port is reported as follows:

Input voltageLogical State
VIN > 2.0 VHIGH
VIN < 0.8 VLOW
Unconnected input portUndetermined

Compatible sources

Sources with the following drivers are compatible:

□ LVTTL ( 3.3 V low-voltage TTL)
□ CMOS (5 V CMOS)
□ LVCMOS (3.3 V CMOS)

Compatible loads

Loads with the following receivers are compatible:

□ TTL (5 V TTL)
□ CMOS (5 V CMOS)