Datasheet

KSZ8795CLX
DS00002112B-page 126  2016-2017 Microchip Technology Inc.
8.0 RESET CIRCUIT
The following discrete reset circuit, shown in Figure 8-1, is recommended when powering up the KSZ8795 device. For
an application where the reset circuit signal comes from another device (e.g., CPU, FPGA, etc.), the reset circuit as
shown in Figure 8-2 is recommended.
FIGURE 8-1: RECOMMENDED RESET CIRCUIT
FIGURE 8-2: RECOMMENDED CIRCUIT FOR INTERFACING WITH CPU/FPGA RESET
Figure 8-2 shows a reset circuit recommended for applications where reset is driven by another device (for example,
the CPU or an FPGA). The reset out RST_OUT_n from CPU/FPGA provides the warm reset after power up reset. D2
is required if using different V
DDIO
voltage between switch and CPU/FPGA. Diode D2 should be selected to provide
maximum 0.3V VF (Forward Voltage), for example, VISHAY BAT54, MSS1P2L. Alternatively, a level shifter device can
also be used. D2 is not required if switch and CPU/FPGA use same V
DDIO
voltage.
R
10k
C
10µF
D1
KS8795
RST
D1: 1N4148
VDDIO
R
10k
D2
C
10µF
D1
CPU/FPGA
RST_OUT_n
KS8795
RST
D1, D2: 1N4148
VDDIO