ZHCSF38G March 2016 – May 2018 AM5716 , AM5718
PRODUCTION DATA.
A 1.8-V LVCMOS-Compatible Clock Input can be used instead of the internal oscillator to provide the SYS_CLKIN1 clock input to the system. The external connections to support this are shown in Figure 6-4. The xi_osc0 pin is connected to the 1.8-V LVCMOS-Compatible clock source. The xi_osc0 pin is left unconnected. The vssa_osc0 pin is connected to board ground (VSS).
Table 6-3 summarizes the OSC0 input clock electrical characteristics.
NAME | DESCRIPTION | MIN | TYP | MAX | UNIT |
---|---|---|---|---|---|
f | Frequency | 19.2, 20, 27 | MHz | ||
CIN | Input capacitance | 2.184 | 2.384 | 2.584 | pF |
IIN | Input current (3.3V mode) | 4 | 6 | 10 | µA |
Table 6-4 details the OSC0 input clock timing requirements.
NAME | DESCRIPTION | MIN | TYP | MAX | UNIT | ||
---|---|---|---|---|---|---|---|
CK0 | 1 / tc(xiosc0) | Frequency, xi_osc0 | 19.2, 20, 27 | MHz | |||
CK1 | tw(xiosc0) | Pulse duration, xi_osc0 low or high |
0.45 * tc(xiosc0) |
0.55 * tc(xiosc0) | ns | ||
tj(xiosc0) | Period jitter(1), xi_osc0 | 0.01 × tc(xiosc0) | ns | ||||
tR(xiosc0) | Rise time, xi_osc0 | 5 | ns | ||||
tF(xiosc0) | Fall time, xi_osc0 | 5 | ns | ||||
tj(xiosc0) | Frequency accuracy(4), xi_osc0 | Ethernet not used | ±200 | ppm | |||
Ethernet RGMII and RMII using derived clock | ±50 | ||||||
Ethernet MII using derived clock | ±100 |
– The maximum value is the difference between the longest measured clock period and the expected clock period
– The minimum value is the difference between the shortest measured clock period and the expected clock period