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FXL4245 Fiches technique(PDF) 2 Page - Fairchild Semiconductor

No de pièce FXL4245
Description  Low Voltage Dual Supply 8-Bit Signal Translator with Configurable Voltage Supplies and Signal Levels and 3-STATE Outputs
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Fabricant  FAIRCHILD [Fairchild Semiconductor]
Site Internet  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FXL4245 Fiches technique(HTML) 2 Page - Fairchild Semiconductor

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Terminal Descriptions
Truth Table
H
= HIGH Voltage Level
L
= LOW Voltage Level
X
= Don’t Care
Connection Diagram
Terminal Assignments for MLP
(Top View)
Terminal Assignment
Power-Up/Power-Down Sequencing
FXL translators offer an advantage in that either VCC may
be powered up first. This benefit derives from the chip
design. When either VCC is at 0 volts, outputs are in a
HIGH-Impedance state. The control inputs (T/R and OE)
are designed to track the VCCA supply. A pull-up resistor
tying OE to VCCA should be used to ensure that bus con-
tention, excessive currents, or oscillations do not occur
during power-up/power-down. The size of the pull-up resis-
tor is based upon the current-sinking capability of the OE
driver.
The recommended power-up sequence is the following:
1. Apply power to either VCC.
2. Apply power to the T/R input (Logic HIGH for A-to-B
operation; Logic LOW for B-to-A operation) and to the
respective data inputs (A Port or B Port). This may
occur at the same time as Step 1.
3. Apply power to other VCC.
4. Drive the OE input LOW to enable the device.
The recommended power-down sequence is the following:
1. Drive OE input HIGH to disable the device.
2. Remove power from either VCC.
3. Remove power from other VCC.
Terminal
Names
Description
OE
Output Enable Input
T/R
Transmit/Receive Input
A0–A7
Side A Inputs or 3-STATE Outputs
B0–B7
Side B Inputs or 3-STATE Outputs
VCCA
Side A Power Supply
VCCB
Side B Power Supply
GND
Ground
Inputs
Outputs
OE
T/R
L
L
Bus B Data to Bus A
L
H
Bus A Data to Bus B
HX
3-STATE
Terminal Number
Terminal Name
Terminal Number
Terminal Name
1VCCA
13
GND
2T/R
14
B7
3A0
15
B6
4A1
16
B5
5A2
17
B4
6A3
18
B3
7A4
19
B2
8A5
20
B1
9A6
21
B0
10
A7
22
OE
11
GND
23
VCCB
12
GND
24
VCCB


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Numéro de composants électroniques

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