NS7520B-1-C55 Digi International, NS7520B-1-C55 Datasheet - Page 31
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NS7520B-1-C55
Manufacturer Part Number
NS7520B-1-C55
Description
IC ARM MICROPROCESSOR 177BGA
Manufacturer
Digi International
Series
NET+ARM®r
Specifications of NS7520B-1-C55
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
Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
NS7520B-1-C55
Manufacturer:
IR
Quantity:
4 954
Company:
Part Number:
NS7520B-1-C55
Manufacturer:
Digi International
Quantity:
10 000
Part Number:
NS7520B-1-C55
Manufacturer:
NETARM
Quantity:
20 000
Table 8: Output buffer derating by load capacitance
Figure 8 illustrates the recommended oscillator circuit details.
Figure 8: Oscillator circuit details
Oscillator Characteristics
CS[4:0]_, CAS[3:0], RW_, WE_, OE_
MDC, TXD[3:0], TXER, TXEN, TDO
Signal
Rise time = 18ns;
0.8V to 2.0V
3R3V
RESET_
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).
TB1
100nF
Optional 36.864-55.296MHz Oscillator
PLL bypassed - U1 & R2 OUT, R1 IN
C3
A 18.432MHz crystal or 55.296MHz
oscillator allows full speed operation.
PLL enabled - U1 & R2 IN, R1 OUT
4
2
1
C1
10pF
C2
10pF
1
2
Y2
SM_Oscillator
VCC
GND
TEST
U1
NC
LVC04
10-20MHz
OUT
X2
3
5
4
3
3R3V
R3
1M
R2
0 OHM
100 OHM
0 OHM
R4
R11
XTAL1
XTAL2
R1
10K
K14
K12
L13
A10
0.137
0.274
Derating (ns/pF)
w w w . d i g i . c o m
SCANEN_
RESET_
XTAL1
XTAL2
NS7520
O s c i l l a t o r C h a r a c t e r i s t i c s
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