MAX13046E Datasheet, PDF (9/15 Pages) Maxim Integrated Products – Single- and Dual-Bidirectional Low-Level Translator

V_L
PU1
10kΩ
Single- and Dual-Bidirectional
Low-Level Translator
Functional Diagram
V_CC
ONE-SHOT
RISE-TIME
ACCELERATOR
GATE BIAS
ONE-SHOT
RISE-TIME
ACCELERATOR
PU2
10kΩ
I/O V_L
N
I/O V_CC
SHDN
GND
Level Translation
For proper operation, ensure that +1.65V ≤ V_CC ≤
+5.5V and +1.1V ≤ V_L ≤ the minimum of either +3.6V or
(V_CC + 0.3V). During power-up sequencing, V_L ≥ (V_CC
+ 0.3V) does not damage the device. The speed of the
rise time accelerator circuitry limits the maximum data
rate for the MAX13046E/MAX13047E to 16Mbps.
Rise-Time Accelerators
The MAX13046E/MAX13047E have an internal rise-time
accelerator, allowing operation up to 16Mbps. The rise-
time accelerators are present on both sides of the
device and act to speed up the rise time of the input
and output of the device, regardless of the direction of
the data. The triggering mechanism for these accelera-
tors is both level and edge sensitive. To guarantee
operation of the rise time accelerators the maximum
parasitic capacitance should be less than 200pF on the
I/O lines.
Shutdown Mode
Drive SHDN low to place the MAX13046E/MAX13047E
in shutdown mode and drive SHDN high for normal
operation. Activating the shutdown mode disconnects
the internal 10kΩ pullup resistors on the I/O V_CC and I/O
V_L lines. This forces the I/O lines to a high-impedance
state, and decreases the supply current to less than
1µA. The high-impedance I/O lines in shutdown mode
allow for use in a multidrop network. The MAX13046E/
MAX13047E have a diode from each I/O to the corre-
sponding supply rail and GND. Therefore, when in shut-
down mode, do not allow the voltage at I/O V_L to exceed
(V_L + 0.3V), or the voltage at I/O V_CC to exceed (V_CC +
0.3V).
Operation with One Supply Disconnected
Certain applications require sections of circuitry to be
disconnected to save power. When V_L is connected and
V_CC is disconnected or connected to ground, the device
enters shutdown mode. In this mode, I/O V_L can still be
driven without damage to the device; however, data
does not translate from I/O V_L to I/O V_CC. If V_CC falls
more than V_{TH_L_VCC} below V_L, the device disconnects
the pullup resistors at I/O V_L and I/O V_CC. To achieve the
lowest possible supply current from V_L when V_CC is dis-
connected, it is recommended that the voltage at the
V_CC supply input be approximately equal to GND.
When V_CC is connected and V_L is less than V_{TH_VL}, the
device enters shutdown mode. In this mode, I/O V_CC
can still be driven without damage to the device; howev-
er, data does not translate from I/O V_CC to I/O V_L.
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