Datasheet

MAX3370/MAX3371
1µA, 2Mbps, Low-Voltage Level
Translators in SC70 and µDFN
8 _______________________________________________________________________________________
Pin Description
PIN
MAX3370
(SC70-5) (μDFN-6)
MAX3371
(SC70-6 AND
μDFN-6)
NAME FUNCTION
1 1 1 V
L
Logic Supply Voltage
2 2 2 GND Ground
3 3 3 I/O V
L
Input/Output Referred to V
L
4 4 4 I/O V
CC
Input/Output Referred to V
CC
5 6 6 V
CC
Power-Supply Voltage
— — 5 SHDN
Shutdown. A high turns on the device. A low shuts
down the device. I/O V
CC
and I/O V
L
are high impedance
in shutdown.
— 5 — N.C. No Connection
Detailed Description
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
CC
and an I/O pin referenced to V
L
. The
V
CC
supply voltage range is from +2.5V to +5.5V, and
the V
L
supply voltage range is between +1.6V and
+5.5V. The MAX3371 features a shutdown mode in
which I/O V
CC
and I/O V
L
are placed in a high-imped-
ance state and supply current drops to 1µA.
The MAX3370/MAX3371 are bidirectional level shifters
allowing data transfer from the V
CC
side to the V
L
side,
and from the V
L
side to the V
CC
side. Both devices
operate at speeds up to 2Mbps with an active driver
and up to 500kbps with an open-drain driver.
Level Translation
The MAX3370/MAX3371 provide bidirectional level
translation between I/O pins referred to V
CC
and V
L
.
I/O V
CC
and I/O V
L
are internally pulled up to their
respective power-supply rails through 10kΩ resistors.
V
CC
must be between +2.5V and +5.5V, and V
L
must
be between +1.6V and +5.5V. For proper operation, V
L
can not exceed V
CC
.
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.
MAX3371 Shutdown Mode
The MAX3371 enters a low-power shutdown mode
when SHDN is driven low. Connect SHDN to V
L
or drive
high for normal operation. Activating shutdown mode
disconnects the internal 10kΩ pullup resistors on I/O
V
CC
and I/O V
L
. As a result, the supply current
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
L
can be driven to V
L
and I/O V
CC
can be driven to V
CC
.
Functional Diagram
SPEEDUP
MNSW
R
1
S
1
S
2
R
2
GND
I/O V
CC
I/O V
L
V
CC
V
L
MAX3370