Datasheet

78Q2120C
10/100BASE-TX
Transceiver
Page: 21 of 35 © 2009 Teridian Semiconductor Corporation Rev 1.3
DIGITAL I/O CHARACTERISTICS:
Pins of type CI, CIU, CID, CIO:
PARAMETER SYMBOL CONDITIONS MIN NOM MAX UNIT
Input Voltage Low Vil 0.8 V
Input Voltage High Vih 2.0 5.5 V
Input Current Iil, Iih -1 1
µA
Pull-up Resistance Rpu Type CIU only 38 56 78
kΩ
Pull-down Resistance Rpd Type CID only 38 56 78
kΩ
Input Capacitance Cin 8 pF
Pins of type CIS:
PARAMETER SYMBOL CONDITIONS MIN NOM MAX UNIT
Low-to-High Threshold Vt+ 1.3 1.7 V
High-to-Low Threshold Vt- 0.80 1.20 V
Input Current Iil, Iih -1 1
µA
Input Capacitance Cin 8 pF
Pins of type COZ:
PARAMETER SYMBOL CONDITIONS MIN NOM MAX UNIT
Output Voltage Low Vol Iol = 4mA 0.4 V
Output Voltage High Voh Ioh = -4mA 2.4 V
Output Transition Time Tt CL = 20pF 6 ns
Tristate Output Leakage
Current
Iz -1 1
µA
Pins of type CO:
PARAMETER SYMBOL CONDITIONS MIN NOM MAX UNIT
Output Voltage Low Vol Iol = 8mA 0.4 V
Output Voltage High Voh Ioh = -8mA 2.4 V
Output Transition Time Tt CL = 20pF 6 ns
Pins of type CIO:
PARAMETER SYMBOL CONDITIONS MIN NOM MAX UNIT
Output Voltage Low Vol Iol = 4mA 0.4 V
Output Voltage High Voh Ioh = -4mA 2.4 V
Output Transition Time Tt CL = 20pF 6 ns