SN74AXC4T774 datasheet(21/43 Pages) TI2

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7.3.6 Glitch-Free Power Supply Sequencing

Either supply rail may be powered on or off in any order without producing a glitch on the I/Os (that is,

where the output erroneously transitions to VCC when it should be held low). Glitches of this nature can be

misinterpreted by a peripheral as a valid data bit, which could trigger a false device reset of the peripheral,

a false device configuration of the peripheral, or even a false data initialization by the peripheral. For more

information regarding the power up glitch performance of the AXC family of level translators, see the Glitch Free

Power Sequencing With AXC Level Translators application report

7.3.7 Negative Clamping Diodes

The inputs and outputs to this device have negative clamping diodes as depicted in Figure 7-1.

CAUTION

Voltages beyond the values specified in the Absolute Maximum Ratings table can cause damage to

the device. The input negative-voltage and output voltage ratings may be exceeded if the input and

output clamp-current ratings are observed.

GND

Logic

Input

Output

VCC

Device

-IIK

-IOK

Figure 7-1. Electrical Placement of Clamping Diodes for Each Input and Output

7.3.8 Fully Configurable Dual-Rail Design

Both the VCCA and VCCB pins can be supplied at any voltage from 0.65 V to 3.6 V, making the device suitable for

translating between any of the voltage nodes (0.7 V, 0.8 V, 0.9 V, 1.2 V, 1.8 V, 2.5 V and 3.3 V).

7.3.9 I/Os with Integrated Static Pull-Down Resistors

To help avoid floating inputs on the I/Os, this device has 71kΩ typical integrated weak pull-downs on all data

I/Os. This feature allows all inputs to be left floating without the concern for unstable outputs or increased

current consumption. This also helps to reduce external component count for applications where not all channels

are used or need to be fixed low. If an external pull-up is required, it should be no larger than 7kΩ to avoid

contention with the 71kΩ internal pull-down.

7.3.10 Supports High-Speed Translation

The SN74AXC4T774 device can support high data-rate applications. The translated signal data rate can be up

to 310 Mbps when the signal is translated from 1.8 V to 3.3 V.

7.4 Device Functional Modes

Table 7-1. Function Table

(Each Transceiver)

CONTROL INPUTS(1) (2)

PORT STATUS

OPERATION

DIR

A PORT

B PORT

Output (Enabled)

Input (Hi-Z)

B data to A bus

Input (Hi-Z)

Output (Enabled)

A data to B bus

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SN74AXC4T774

SCES898C – JULY 2019 – REVISED MAY 2022

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