NS7520B-1-C36 Digi International, NS7520B-1-C36 Datasheet - Page 19

• 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

System clock and reset
Signal descriptions
The NS7520 has three clock domains:
The SYS module provides the NS7520 with these clocks, as well as system reset and backup
resources.
Table 2: Clock generation and reset signal description
This figure shows the timing and specification for RESET_ rise/fall times:
XTALA1
XTALA2
PLLVDD (1.5V)
PLLVSS
RESET_
XTALA1
XTALA2
PLLVDD
PLLVSS
RESET_
Symbol
Mnemonic
System clock (SYSCLK)
Bit rate generation and programmable timer reference clock (XTALA1/2)
System bus clock (BCLK)
tF max = 18ns
Vin = 2.0V to 0.8V
Oscillator input
Oscillator output
Clean PLL power
Connect directly to the
GND plane
System reset
Signal
tF
K14
K12
L15
L12
A10
Pin
I
O
P
P
I
I/O
A standard parallel quartz crystal or crystal oscillator can be
attached to these pins to provide the main input clock to the
NS7520.
Power and ground for PLL circuit.
Resets the NS7520 hardware.
Description
OD
tR max = 18ns
Vin = 0.8V to 2.0V
ARM/system oscillator circuit
PLL clean power
PLL return
System reset
Description
tR
w w w . d i g i . c o m
S y s t e m c l o c k a n d r e s e t
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