MAX14591_14 Datasheet, PDF (10/13 Pages) Maxim Integrated Products – High-Speed, Open-Drain Capable Logic-Level Translator

MAX14591
High-Speed, Open-Drain Capable
Logic-Level Translator
Block Diagram
V_L
IOVL_
MAX14591
ONE-SHOOT
BLOCK
TS
ONE-SHOOT
BLOCK
EN CONTROL
BLOCK
GATE
DRIVE
N Q1
VCC
IOVCC_
Detailed Description
The MAX14591 is a dual-channel, bidirectional level trans-
lator. The device translates low voltage down to +0.9V on
the V_L side to high voltage on the V_CC side and vice-ver-
sa. The device is optimized for open-drain and high-speed
operation, such as I²C bus and MDIO bus.
The device has low on-resistance (17I max), which
is important for high-speed, open-drain operation. The
device also features internal pullup resistors that are
active when the corresponding power is on and TS is high.
Level Translation
For proper operation, ensure that +1.65V P V_CC P +5.5V,
and +0.9V P V_L P V_CC. When power is supplied to VL
while V_CC is less than V_L, the device automatically
disables logic-level translation function. Also, the device
enters shutdown mode when TS = GND.
High-Speed Operation
The device meets the requirements of high-speed I²C
and MDIO open-drain operation. The maximum data rate
is at least 4MHz for open-drain operation with the total
bus capacitance equal to or less than 100pF.
Three-State Input TS
The device features a three-state input that can put the
device into high-impedance mode. When TS is low,
IOVCC_ and IOVL_ are all high impedance and the inter-
nal pullup resistors are disconnected. When TS is high,
the internal pullup resistors are connected when the
corresponding power is in regulation, and the resistors
are disconnected at the side that has no power on. In
many portable applications, one supply is turned off but
the other side is still operating and requires the pullup
resistors to be present. This feature eliminates the need
for external pullup resistors. The level translation function
is off until both power supplies are in range.
Thermal-Shutdown Protection
The device features thermal-shutdown protection to
protect the part from overheating. The device enters
thermal shutdown when the junction temperature exceeds
+150NC (typ), and the device is back to normal operation
again after the temperature drops by approximately 10NC
(typ). When the device is in thermal shutdown, the level
translator is disabled.
Maxim Integrated
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