Datasheet

SCBA015A
7–26
Fast GTLP Backplanes With the GTLPH1655
Static Characteristics of the SN74GTLPH1655
An understanding of the static characteristics of a component is necessary for a circuit
development to be successful. The input and output characteristics of the SN74GTLPH1655
were, therefore, measured under laboratory conditions.
Input Characteristics
In principle, the input characteristics appear identical on both sides (A and B ports) of the device.
In Figure 16, the input protection diode easily is recognized; it is found both at the inputs of the
LVTTL side (A port) and also at the inputs of the GTLP side (B port) of the device. The diode
circuit provides protection against high negative-voltage spikes, which can occur as the result of
electrostatic discharges or line reflections. In such cases, the diode conducts and prevents
more-sensitive components from being destroyed.
–2 V
–1 V
0 V
1 V
2 V
3 V
4 V
5 V
–100 mA –80 mA –60 mA –40 mA –20 mA 0 mA 20 mA 40 mA 60 mA 80 mA 100 mA
Input Current
Input Voltage
Figure 16. Input Characteristics of SN74GTLPH1655