DS_8009C_025 73S8009C Data Sheet
Rev. 1.5 29
PIN
VDD
TTL
To
circuit
Pull-up
Disable
VERY
WEAK
PFET
ESD
VERY
WEAK
NFET
Pull-down
Enable
ESD
Note: Pins CMDVCC%, CMDVCC#, CS have the pull-up enabled.
Pins RSTIN, CLKIN, PRES, EXT_RST have the pull-down enabled.
Pin OFF_ACK has a 100 kΩ resistor connected to pin OFF_REQ internally.
Figure 18: General Input Circuit
PIN
VDD
STRONG
PFET
STRONG
NFET
Data
From
circuit
To
OFF_ACK
pad
Output
Disable
ESD
ESD
100k ohm
Notes: Strong PFET or NFET is approximately 100 Ω.
Very strong PFET or NFET is approximately 50 Ω.
Medium strength PFET is approximately 1 kΩ.
Very weak PFET or NFET is approximately 1 MΩ.
The diodes represent ESD protection devices that will conduct current if forward biased.
Figure 19: OFF_REQ Interface Circuit
