TTL Input/Output (Version 2)

Applies to Closed1628 Grablink Duo, 3602 Coaxlink Octo, 3603 Coaxlink Quad CXP-12, 3603-4 Coaxlink Quad CXP-12, 3620 Coaxlink Quad CXP-12 JPEG, 3620-4 Coaxlink Quad CXP-12 JPEG, 3621 Coaxlink Mono CXP-12, 3621-LH Coaxlink Mono CXP-12 LH, 3622 Coaxlink Duo CXP-12, 3622-LH Coaxlink Duo CXP-12 LH, 3623 Coaxlink Quad CXP-12 Value, 3624 Coaxlink Quad CXP-12 DF, 3625 Coaxlink QSFP+, 3610 HD26F I/O Extension Module - TTL-RS422 and 3618 HD26F I/O Extension Module - Fast I/O.

TTL Input/Output Simplified schematic

The port implements a 3.3 V LVTTL driver and a 5 V-compliant 3.3 V LVTTL 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
Low-level output current       64 mA
Low-level output voltage @ 8 mA   0.34 0.36 V
@ 16 mA   0.48 0.55 V
@ 32 mA   0.78 0.81 V
@ 64 mA   1.34 1.36 V
High-level output current       -32 mA
High-level output voltage @-8 mA; (1) 2.60 3.00   V
@-16 mA; (1) 2.20 2.70   V
@-32 mA; (1) 1.75 2.20   V
ESD protection Human Body Model (HBM) 2     kV

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   100     ns
Pulse rate   0   5 MHz
10%-90% rise time     8   ns
10%-90% fall time     7.5   ns

Receiver

Parameter Conditions Min. Typ. Max. Units
Pulse width   100     ns
Pulse rate   0   5 MHz

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)
□ TTL (5 V TTL)
□ CMOS (5 V CMOS)

Compatible loads

Loads with the following receivers are compatible:

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