NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 18

• Manufacturer Part Number: NS7520B-1-I46
• Description: IC ARM MICROPROCESSOR 177BGA
• Manufacturer: Digi International
• Series: NET+ARM®r

Specifications of NS7520B-1-I46

• Applications: Network Processor
• Core Processor: ARM7
• Program Memory Type: External Program Memory
• Controller Series: -
• Ram Size: External
• Interface: EBI/EMI, Ethernet, DMA, SPI, UART
• Number Of I /o: 16
• Voltage - Supply: 1.4 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 177-LFBGA
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

O p e r a t i n g f r e q u e n c y
Operating frequency
The NS7520 is available in grades operating at three maximum operating frequencies:
36 MHz, 46 MHz, and 55 MHz. The operating frequency is set during bootstrap
initialization, using pins A[8:0]. These address pins load the PLL settings register on
powerup reset. A[8:7] determines IS (charge pump current); A[6:5] determines FS
(output divider), and A[4:0] defines ND (PLL multiplier). Each bit in A[8:0] can be set
individually.
See "Setting the PLL frequency," beginning on page 54, for more detailed
information.
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