20-668-0011 Rabbit Semiconductor, 20-668-0011 Datasheet - Page 260

• Manufacturer Part Number: 20-668-0011
• Description: IC MPU RABIT3000A 55.5MHZ128LQFP
• Manufacturer: Rabbit Semiconductor

Specifications of 20-668-0011

• Processor Type: Rabbit 3000 8-Bit
• Speed: 55.5MHz
• Voltage: 2.5V, 2.7V, 3V, 3.3V
• Mounting Type: Surface Mount
• Package / Case: 128-LQFP
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 55.5 MHz
• Operating Supply Voltage: 1.8 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 55 C
• Number Of Programmable I/os: 56
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 316-1061

27.5.2 Battery-Backed Clock Current Consumption
For the battery-backed features of the Rabbit 3000 to perform while the processor is pow-
ered down, both the VBAT and BATIO pins need to be supplied properly. The VBAT pin
powers the internal real-time clock and the battery-backed SRAM, while VBATIO powers
the /RESET, /CS1, CLK32K, and RESOUT pins.
Note that the VBATIO pin can be powered at 1.8 V during powerdown even if the proces-
sor is running at 3.3 V normally. A circuit to switch between a 1.8–2.0 V battery and the
main power can use the RESOUT pin to switch the power source for the VBATIO pin. R
is a current-limiting resistor that should be adjusted for the battery voltage; a good value to
use for a 3.0 V battery is 150 k.
Table 27-12 shows the typical current consumption for these pins while the remainder of
the Rabbit 3000 is powered down.
250
Table 27-12. Typical Battery-Backed Current Consumption
Figure 27-8. Switching Circuit for VATIO Pin
VBAT
Pin
(-40°C to +85°C)
Voltage
3.3 V
1.8 V
Rabbit 3000 Microprocessor User’s Manual
Current
7 µA
1 µA