TTL Input/Output

Specification of the TTL GPIO input/output ports

TTL Input/Output Simplified schematic

The receiver is LVTTL and 5 V TTL compliant. The driver is a 3.3 V TTL driver.

DC characteristics

Parameter	Conditions	Min.	Typ.	Max.	Units
Common mode input voltage		0		5	V
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.

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

AC characteritics

Parameter	Conditions	Min.	Typ.	Max.	Units
Pulse width		100			ns
Pulse rate		0		5	MHz
10%-90% rise/fall time	(1)		10	20	ns

Condition (1): Short cable (1 m) and a 300 Ohms line termination resistor to GND.

Logical Map

The state of the port is reported as follows:

Compatible drivers and receivers

The following drivers are compatible:

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Totem-pole LVTTL, TTL, 5 V CMOS drivers

The following receivers are compatible:

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LVTTL, TTL, 3-Volt CMOS receivers