Datasheet

Compute Module Datasheet
Copyright Raspberry Pi (Trading) Ltd. 2016
AC Characteristics are defined in Table 6 and Fig. 5.
Pin Name Symbol Parameter Minimum Typical Maximum Unit
Digital outputs t
rise
10-90% rise time
a
- 1.6 - ns
Digital outputs t
fall
90-10% fall time
a
- 1.7 - ns
GPCLK t
JOSC
Oscillator-derived GPCLK - - 20 ps
cycle-cycle jitter (RMS)
GPCLK t
JP LL
PLL-derived GPCLK - - 48 ps
cycle-cycle jitter (RMS)
a
Default drive strength, CL = 5pF, VDD IOx = 3.3V
Table 6: Digital I/O Pin AC Characteristics
t
fall
t
rise
DIGITAL
OUTPUT
Figure 5: Digital IO Characteristics
7 Power Supplies
The Compute Module has six separate supplies that must be present and powered at all times; you cannot
leave any of them unpowered, even if a specific interface or GPIO bank is unused. The six supplies are
as follows:
1. VBAT is used to power the BCM283x processor core. It feeds the SMPS that generates the chip
core voltage.
2. 3V3 powers various BCM283x PHYs, IO and the eMMC Flash.
3. 1V8 powers various BCM283x PHYs, IO and SDRAM.
4. VDAC powers the composite (TV-out) DAC.
5. GPIO0-27 VREF powers the GPIO 0-27 IO bank.
6. GPIO28-45 VREF powers the GPIO 28-45 IO bank.
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