TX4939XBG-400 Toshiba, TX4939XBG-400 Datasheet - Page 48
TX4939XBG-400
Manufacturer Part Number
TX4939XBG-400
Description
Manufacturer
Toshiba
Datasheet
1.TX4939XBG-400.pdf
(740 pages)
Specifications of TX4939XBG-400
Cpu Core
TX49/H4 90nm
Clock Mhz/max Mips
400/520
Inst./data Cache
32KB (4 Way)/32KB (4 Way)
Tlb
x
1cycle Mac
x
Volts (v)
1.25/2.5/3.3
Peripherals
DDR, NAND, ATA, ETHERNET, SECURITY, FPU, MMU, SPI, I2S, I2C, PCI, VIDEO, UART, TIMER, RTC
Companion Chip
TC86C001FG
Package
PGBA456
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3.5.2
(2) If lead insertion hole intervals on the printed circuit board do not precisely match the lead pitch of the
(3) For the minimum clearance specification between a device and a printed
(4) Observe the following precautions when forming the leads of a device prior to mounting.
(1) When socket mounting devices on a printed circuit board, use sockets which match the inserted device’s
(2) Use sockets whose contacts have the appropriate contact pressure. If the contact pressure is insufficient, the
(3) When soldering sockets to the printed circuit board, use sockets whose construction prevents flux from
(4) Make sure the coating agent applied to the printed circuit board for moisture-proofing purposes does not
(5) If the device leads are severely bent by a socket as it is inserted or removed and you wish to repair the leads
(6) If the printed circuit board with the devices mounted on it will be subjected to vibration from external
•
•
•
Use a tool or jig to secure the lead at its base (where the lead meets the device package) while bending so as
to avoid mechanical stress to the device. Also avoid bending or stretching device leads repeatedly.
Be careful not to damage the lead during lead forming.
Follow any other precautions described in the individual datasheets and databooks for each device and
package type.
device, do not attempt to forcibly insert devices by pressing on them or by pulling on their leads.
circuit board, refer to the relevant device’s datasheet and databook. If
necessary, achieve the required clearance by forming the device’s leads
appropriately. Do not use the spacers which are used to raise devices above
the surface of the printed circuit board during soldering to achieve clearance.
These spacers normally continue to expand due to heat, even after the solder
has begun to solidify; this applies severe stress to the device.
Socket mounting
package.
socket may not make a perfect contact when the device is repeatedly inserted and removed; if the pressure
is excessively high, the device leads may be bent or damaged when they are inserted into or removed from
the socket.
penetrating into the contacts or which allows flux to be completely cleaned off.
stick to the socket contacts.
so as to continue using the device, make sure that this lead correction is only performed once. Do not use
devices whose leads have been corrected more than once.
sources, use sockets which have a strong contact pressure so as to prevent the sockets and devices from
vibrating relative to one another.
3 General Safety Precautions and Usage Considerations
3-12
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