NS7520B-1-C55 Digi International, NS7520B-1-C55 Datasheet - Page 30
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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
Figure 7: System configuration for specified timing
Table 7: System loading details
Exceeding the loading shown in Table 7 can result in additional signal delay. The delay can be
approximated by derating the output buffer based on the expected load capacitance per the values
shown in Table 8.
Table 8: Output buffer derating by load capacitance
2 6
BCLK
A[27:0], CAS[3:0]_
CS[4:0]_
DATA[31:0]
BE*_
TS_, TA_, TEA_, BR_, BG_, BUSY_, WE_,
OE_
PORTA3, PORTA1, PORTC3, PORTC1
(operating external DMA)
Other PORTA[*] and PORTC[*], TDO
MDC, MDIO, TXEN, TXER, TXD[3:0]
BCLK
A[27:0], TS_, TA_, TEA_, BR_, BG_, BUSY_, DATA[31:0]
BE[3:0]
A C e l e c t r i c a l s p e c i f i c a t i o n s
Signal
Signal
NS7520
N S 7 5 2 0 D a t a s h e e t
SDRAM
23
23
13
18
19
15
15
85
20
SDRAM
Estimated load (pF)
other
memory
devices
Buffer
0 3 / 2 0 0 6
0.069
0.150
0.300
Derating (ns/pF)
Two SDRAMs, 1 clock buffer/clock
input to PLD
Two SDRAM An, 1 buffer/PLD
Two SDRAM CSn, 1 buffer PLD
One SDRAM DQ, 1 buffer/PLD
One SDRAM DQ, 1 buffer/PLD
1 buffer/PLD
1 buffer/PLD
Tester load
One PHY
Device loads