NS7520B-1-C36 Digi International, NS7520B-1-C36 Datasheet - Page 30

• 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

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