NS7520B-1-C36 Digi International, NS7520B-1-C36 Datasheet - Page 275

• Manufacturer Part Number: NS7520B-1-C36
• Description: IC ARM MICROPROCESSOR 177BGA
• Manufacturer: Digi International
• Series: NET+ARM®r

Specifications of NS7520B-1-C36

• 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

Oscillator Characteristics
Table 101: Output buffer derating by load capacitance
Figure 31 illustrates the recommended oscillator circuit details.
BCLK
A[27:0], TS_, TA_, TEA_, BR_, BG_, BUSY_, DATA[31:0]
BE[3:0]
CS[4:0]_, CAS[3:0], RW_, WE_, OE_
MDC, TXD[3:0], TXER, TXEN, TDO
Signal
Rise/fall time. The max rise/fall time on the system clock input pin is 1.5ns
when used with an external oscillator.
Duty cycle. The duty cycle is system-dependent with an external oscillator.
It affects the setup and hold times of signals that change in the falling clock
edges, such as WE_/OE_.
Recommendation: Use a 3.3V, 50±10% duty cycle oscillator with a 100 ohm
series resistor at the output. The PLLs can handle a 25% duty cycle clock
(minimum high/low time 4.5nS).
w w w . d i g i e m b e d d e d . c o m
0.069
0.150
0.300
0.137
0.274
Derating (ns/pF)
E l e c t r i c a l C h a r a c t e r i s t i c s
2 6 3