TXC-06880BIOG Transwitch Corporation, TXC-06880BIOG Datasheet - Page 23

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TXC-06880BIOG

Manufacturer Part Number
TXC-06880BIOG
Description
Manufacturer
Transwitch Corporation
Datasheet

Specifications of TXC-06880BIOG

Operating Supply Voltage (typ)
1.8/3.3V
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Lead Free Status / RoHS Status
Not Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
TXC-06880BIOG
Manufacturer:
SAMWHA
Quantity:
34 000
PRELIMINARY TXC-06880-MB, Ed. 4
February 2005
Note: VDD18 and VDD33 Power Up Sequence. Because of the multi-power ESD structure used for CMOS I/O cells, there
is a parasitic forward diode path from core power rail (V
V
take either one of the approaches below:
V
reliability reasons. This is because the un-powered V
I/O cell’s post-driver for unknown state. Bus conflict may also occur when only V
that V
we can even power up lower voltage first. This can be done by inserting an external diode between V
the board. By connecting the Schottky diode with anode to lower voltage rail (V
(V
than the threshold voltage of the parasitic diode (parasitic diode Vt=500mV~600mV). This prevents from turning on the
parasitic diode between power rails, avoiding latch up. The external diode will be turned off when V
its normal voltage.
*Note: I = Input; O = Output; P = Power; T = Tristate
Symbol
VDD18
VDD33
DD33
DD33
DD33
(1) Power Up VDD33 First. Turning on V
(2) Place a Schottky Diode Between VDD18 and VDD33. If we can ensure that the parasitic diode does not turn on,
DD18
, there will be current flowing through the parasitic diode that may trigger latch-up. To avoid this problem, users can
3.2 LEAD DESCRIPTIONS
first and then V
), we can force the latter to ramp up with the former with the voltage drop (Schottky diode Vt=150mV~200mV) less
must be powered up after V
F19, H5, H6, H21, H22, J5,
J6, J21, J22, M5, M6, M21,
V5, V6, V21, V22, W5, W6,
N22, P5, P6, P21, P22, T6,
K21, L6, L21, N5, N6, N21,
AB12, AB15, AB18, AB19,
F8, F9, E9, F12, F15, F18,
AA13, AA14, AA16, AA17,
AA20, AA21, AB13, AB14,
F11, F13, F14, F16, F17,
E8, E12, E15, E18, E19,
AA8, AA9, AA12, AA15,
AA18, AA19, AB8, AB9,
M22, R5, R6, R21, R22,
AA6, AA7, AA10, AA11,
F20, F21, G21, G6, K6,
E13, E14, F6, F7, F10,
T21, U6, U21, Y6, Y21
POWER SUPPLY, GROUND AND NO CONNECTS
W21, W22
Lead No.
DD18
. Note: TranSwitch does not recommend powering up V
DD33
- Technical Characteristics -
, depends on the slew rate of power ramp-up in the customer’s application.
I/O/P *
DD33
P
P
first, prevents the parasitic diode from turning on. For example, power up
DD18
V
V
DD18
DD18
DD33
may result in short circuit current (crowbar current) on the CMOS
) to I/O power rail (V
: +1.8 volt 5% CMOS core supply voltage.
: +3.3 volt 5% CMOS input/output pad supply voltage.
DD33
Name/Function
DD18
DD33
DD33
). So, if V
) and cathode to higher voltage rail
is powered on. The maximum interval
seconds earlier than V
DD18
Envoy-CE2 Device
is powered up earlier than
DD33
DD18
is powered up to
DATA SHEET
and V
TXC-06880
DD18
DD33
23 o f 12 2
for
on

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