2.1 Detailed Terminal Descriptions
Please see Table 2−4 through Table 2−19 for more detailed terminal descriptions. The following list defines the
column headings and the abbreviations used in the detailed terminal description tables.
•
I/O Type:
−
−
−
−
−
−
I = Digital input
O = Digital output
I/O = Digital input/output
AI = Analog input
PWR = Power
GND = Ground
•
Input/Output Description:
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
AF = Analog feedthrough
TTLI1 = 5-V tolerant TTL input buffer
TTLI2 = 5-V tolerant TTL input buffer with hysteresis
TTLO1 = 5-V tolerant low-noise 4-mA TTL output buffer
PCII1 = 5-V tolerant PCI input buffer
PCII2 = 5-V tolerant PCI input buffer
PCII3 = 5-V tolerant PCI input buffer
PCII4 = 5-V tolerant PCI input buffer
PCII5 = 5-V tolerant PCI input buffer
PCIO2 = 5-V tolerant PCI output buffer
PCIO4 = 5-V tolerant PCI output buffer
PCIO5 = 5-V tolerant PCI output buffer
LVCI1 = LVCMOS input buffer
LVCO1 = Low-noise 4-mA LVCMOS open drain output buffer
LVCO2 = Low-noise 4-mA LVCMOS open drain output buffer
LVCO3 = Low-noise 8-mA LVCMOS open drain output buffer
•
PU/PD signifies whether the terminal has an internal pullup or pulldown resistor. These pullups are disabled
and enabled by design when appropriate to preserve power.
−
−
−
−
−
−
−
PD1 = 20-µA failsafe pulldown
PD2 = 100-µA failsafe pulldown
PU1 = 200-µA pullup
PU2 = 100-µA pullup
PU3 = 100-µA pullup
PU4 = 100-µA pullup
SW = Switchable 50-µA pullup/200-µA pulldown implemented depending on situation
•
•
•
Power Rail signifies which rail the terminal is clamped to for protection.
External Components signifies any external components needed for normal operation.
Pin Strapping (If Unused) signifies how the terminal must be implemented if its function is not needed.
The terminals are grouped in tables by functionality, such as PCI system function, power-supply function, etc. The
terminal numbers are also listed for convenient reference.
2−13
TI [ TEXAS INSTRUMENTS ]
