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74LVXC3245 Datasheet(PDF) 6 Page - Fairchild Semiconductor

Part No. 74LVXC3245
Description  8-Bit Dual Supply Configurable Voltage Interface Transceiver with 3-STATE Outputs
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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74LVXC3245 Datasheet(HTML) 6 Page - Fairchild Semiconductor

   
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6
Power Up Considerations
To insure the system does not experience unnecessary ICC
current draw, bus contention, or oscillations during power
up, the following guidelines should be adhered to (refer to
Table 1):
• Power up the control side of the device first. This is the
VCCA side.
• OE should ramp with or ahead of VCCA. This will help
guard against bus contention.
• The Transmit/Receive control pin (T/R) should ramp with
VCCA, this will ensure that the A Port data pins are con-
figured as inputs. With VCCA receiving power first, the A
I/O Port should be configured as inputs to help guard
against bus contention and oscillations.
• A side data inputs should be driven to a valid logic level.
This will prevent excessive current draw.
The above steps will ensure that no bus contention or oscil-
lations, and therefore no excessive current draw occurs
during the power up cycling of these devices. These steps
will help prevent possible damage to the translator devices
and potential damage to other system components.
TABLE 1. Low Voltage Translator Power Up Sequencing Table
Please reference Application Note AN-5001 for more detailed information on using Fairchild’s LVX Low Voltage Dual
Supply CMOS Translating Transceivers.
Configurable I/O Application for PCMCIA Cards
Block Diagram
The LVXC3245 is a 24-pin dual supply device well suited
for PCMCIA configurable I/O applications. Ideal for low
power notebook designs, the LVXC3245 consumes less
than 1 mW of quiescent power in all modes of operation.
The LVXC3245 meets all PCMCIA I/O voltage require-
ments at 5V and 3.3V operation. By tying VCCB of the
LVXC3245 to the card voltage supply, the PCMCIA card
will always experience rail to rail output swings, maximizing
the reliability of the interface.
The VCCA pin on the LVXC3245 must always be tied to a
3V power supply. This voltage connection provides internal
references needed to account for variations in VCCB. When
connected as in the figure above, the LVXC3245 meets all
the voltage and current requirements of the ISA bus stan-
dard (IEEE P996).
Device Type
VCCA
VCCB
T/R
OE
A Side I/O
B Side I/O
Floatable Pin
Allowed
74LVXC3245
3V
3V to 5.5V
ramp
ramp
logic
outputs
yes, VCCB and B
(power up 1st)
configurable
with VCCA
with VCCA
0V or VCCA
I/O’s w/ OE HIGH


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