MAX3397E 查看數據表（PDF） - Maxim Integrated

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MAX3397E

Dual Bidirectional Low-Level Translator in µDFN

Maxim Integrated 

Dual Bidirectional Low-Level

Translator in µDFN

VL

VCC

VL VCC

EN

MAX3397E

I/O VL_

DATA

I/O VCC_

GND

RLOAD

CLOAD

VL

VCC

CLOAD

VL VCC

EN

MAX3397E

DATA

I/O VL_

I/O VCC_

RLOAD

GND

I/O VL_

(tRISE,

tFALL < 10ns)

tPD-VL-VCC

tPD-VL-VCC

I/O VCC_

(tRISE,

tFALL < 10ns)

tPD-VCC-VL

tPD-VCC-VL

I/O VCC_

I/O VL_

tRVCC

tFVCC

tRVL

tFVL

Figure 1a. Rail-to-Rail Driving I/O VL

Figure 1b. Rail-to-Rail Driving I/O VCC

Level Translation

For proper operation, ensure that +1.65V ≤ VCC ≤ +5.5V

and +1.2V ≤ VL ≤ +5.5V. During power-up sequencing,

VL ≥ (VCC + 0.3V) does not damage the device. The

speed-up circuitry limits the maximum data rate for the

MAX3397E to 16Mbps. The maximum data rate also

depends heavily on the load capacitance (see the

Typical Operating Characteristics), output impedance of

the driver, and the operational voltage range (see the

Timing Characteristics table).

Rise-Time Accelerators

The MAX3397E has an internal rise-time accelerator,

allowing operation up to 16Mbps. The rise-time accelera-

tors 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 trig-

gering mechanism for these accelerators is both level

and edge sensitive. To prevent false triggering of the

rise-time accelerators, signal fall times of less than

20ns/V are recommended for both the inputs and outputs

of the device. Under less noisy conditions, longer signal

fall times are acceptable. Note: 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 EN low to place the MAX3397E in shutdown

mode. Connect EN to VL or VCC (logic-high) for normal

operation. Activating the shutdown mode disconnects

the internal 10kΩ pullup resistors on the I/O VCC and

I/O VL lines. This forces the I/O lines to a high-imped-

ance 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

MAX3397E effectively has a diode from each I/O to the

corresponding supply rail and GND. Therefore, when in

shutdown mode, do not allow the voltage at I/O VL_ to

exceed (VL + 0.3V), or the voltage at I/O VCC_ to

exceed (VCC + 0.3V).

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