Applications information, Typical operating circuit chip information, Enable input (en) – Rainbow Electronics MAX3022 User Manual
Page 12: Power-supply decoupling, Bit bus translation, Unidirectional vs. bidirectional level translator
MAX3013–MAX3022
+1.2V to +3.6V, 0.1µA, 100Mbps,
8-Channel Level Translators
12
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Enable Input (EN)
The MAX3013–MAX3022 feature an EN input. Pull EN
low to set the MAX3013–MAX3022’s I/O on both sides
in tristate output mode. Drive EN to logic high (V
L
) for
normal operation.
Applications Information
Power-Supply Decoupling
To reduce ripple and the chance of introducing data
errors, bypass V
L
and V
CC
to ground with a 0.1µF
ceramic capacitor. Place the bypass capacitors as
close to the power-supply input pins as possible.
8-Bit Bus Translation
The MAX3013–MAX3022 level-shift the data present on
the I/O line between +1.2V to +3.6V, making them ideal
for level translation between a low-voltage ASIC and a
higher voltage system. The Typical Operating Circuit
shows the MAX3013 bidirectional translator in an 8-bit
bus level translation from a 1.8V system to a 3.3V sys-
tem and vice versa.
Unidirectional vs. Bidirectional Level
Translator
The MAX3013 bidirectional translator can operate as a
unidirectional device to translate signals without inver-
sion. The MAX3014–MAX3022 unidirectional translators
level-shift data in one direction (V
L
→ V
CC
or V
CC
→ V
L
)
on any single data line (see the Ordering Information).
These devices provide the smallest solution (UCSP pack-
age) for unidirectional level translation without inversion.
0V
V
TH_IN
/R
IN
*
-(V
S
- V
TH_IN
)/R
IN
*
I
IN
V
TH_IN
*R
IN
= 4kΩ WHEN DRIVING V
L
SIDE.
R
IN
= 150Ω WHEN DRIVING V
CC
SIDE.
V
S
V
IN
WHERE V
S
= V
CC
OR V
L
.
Figure 6. Typical I
IN
vs. V
IN
MAX3013
+1.8V
+3.3V
+1.8V
SYSTEM
CONTROLLER
+3.3V
SYSTEM
GND
V
L
V
CC
EN
BIT 1
BIT 2
BIT 0
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
BIT 1
BIT 2
BIT 0
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
I/O V
CC
1
I/O V
CC
2
I/O V
CC
3
I/O V
CC
4
I/O V
L
4
I/O V
L
3
I/O V
L
2
I/O V
L
1
0.1µF
0.1µF
I/O V
CC
5
I/O V
CC
6
I/O V
L
6
I/O V
L
5
I/O V
CC
7
I/O V
CC
8
I/O V
L
8
I/O V
L
7
Typical Operating Circuit
Chip Information
TRANSISTOR COUNT: 1447
PROCESS: BiCMOS