MAX3371 MAXIM [Maxim Integrated Products], MAX3371 Datasheet - Page 8

• Manufacturer Part Number: MAX3371
• Description: 1uA, 2Mbps, Low-Voltage Level Translators in SC70
• Manufacturer: MAXIM [Maxim Integrated Products]

1µA, 2Mbps, Low-Voltage Level
Translators in SC70
The MAX3370/MAX3371 provide the necessary level
translation to allow data transfer in a multivoltage sys-
tem. These devices transmit data between an I/O pin
referenced to V
V
the V
+5.5V. The MAX3371 features a shutdown mode in
which I/O V
ance state and supply current drops to 1µA.
The MAX3370/MAX3371 are bidirectional level shifters
allowing data transfer from the V
and from the V
operate at speeds up to 2Mbps with an active driver
and up to 500kbps with an open-drain driver.
The MAX3370/MAX3371 provide bidirectional level
translation between I/O pins referred to V
I/O V
respective power-supply rails through 10k
V
be between +1.6V and +5.5V. For proper operation, V
can not exceed V
The MAX3370/MAX3371 can operate at data rates up
to 2Mbps when driven by an active (push-pull) driver
with a 10pF load, 1Mbps when driven by an active dri-
ver with a 50pF load, or 500kbps when driven by an
open-drain driver with a 30pF load. The internal pullups
allow these devices to be driven by open-drain drivers.
The MAX3371 enters a low-power shutdown mode
when SHDN is driven low. Connect SHDN to V
high for normal operation. Activating shutdown mode
disconnects the internal 10k
8
CC
CC
MAX3370
_______________________________________________________________________________________
supply voltage range is from +2.5V to +5.5V, and
must be between +2.5V and +5.5V, and V
CC
L
—
1
2
3
4
5
supply voltage range is between +1.6V and
and I/O V
CC
PIN
and I/O V
CC
L
CC
MAX3371
side to the V
and an I/O pin referenced to V
L
.
1
2
3
4
6
5
MAX3371 Shutdown Mode
are internally pulled up to their
Detailed Description
L
are placed in a high-imped-
CC
pullup resistors on I/O
CC
Level Translation
I/O V
NAME
SHDN
I/O V
GND
V
V
CC
side. Both devices
side to the V
L
CC
L
CC
Logic Supply Voltage
Ground
Input/Output Referred to V
Input/Output Referred to V
Power-Supply Voltage
Shutdown. A high turns on the device. A low shuts down the device. I/O V
and I/O V
L
resistors.
and V
or drive
L
L
L
. The
side,
must
L
L
are high impedance in shutdown.
L
.
V
decreases to <1µA, and the I/O lines are high imped-
ance. The high impedance I/O lines in shutdown allow
use in a multidrop network. When in shutdown, I/O V
can be driven to V
The speed-up circuit is a one-shot generator that helps
the rise time of the output waveform in the low-to-high
transition. When triggered, switches S
for 320ns to pull up I/O V
reduces the rise time and propagation delay for the
low-to-high transition as well as improves the duty
cycle (closer to 50% for an ideal square-wave input).
See the scope plots in the Typical Operating
Characteristics for the speed-up circuitry in operation.
CC
I/O V
V
L
and I/O V
L
L
CC
R
1
FUNCTION
S
L
1
. As a result, the supply current
L
and I/O V
SPEEDUP
Functional Diagram
MNSW
L
and I/O V
CC
MAX3370
Pin Description
can be driven to V
GND
S
2
1
CC
and S
. This greatly
Speed-Up
R
2
2
CC
turn on
V
I/O V
CC
CC
CC
.
L