SN74AVCH16T245_15 Datasheet, PDF (15/30 Pages) Texas Instruments – 16-Bit Dual-Supply Bus Transceiver

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9 Detailed Description
SN74AVCH16T245
SCES587D – AUGUST 2004 – REVISED NOVEMBER 2015
9.1 Overview
The SN74AVCH16T245 is a 16-bit, dual-supply noninverting bidirectional voltage level translation. Pins A and
control pins (DIR and OE) are supported by V_CCA and pins B are supported by V_CCB. The A port can accept I/O
voltages ranging from 1.2 V to 3.6 V, while the B port can accept I/O voltages from 1.2 V to 3.6 V. A high on DIR
allows data transmission from A to B and a low on DIR allows data transmission from B to A when OE is set to
low. When OE is set to high, both A and B are in the high-impedance state.
SN74AVCH16T245 features Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use
of pullup or pulldown resistors with the bus-hold circuitry is not recommended.
This device is fully specified for partial-power-down applications using off output current ( I_off).
The V_CC isolation feature ensures that if either V_CC input is at GND, both ports are put in a high-impedance state.
9.2 Functional Block Diagram
1
1DIR
47
1A1
48
1OE
2
1B1
24
2DIR
36
2A1
25
2OE
13
2B1
To Seven Other Channels
To Seven Other Channels
9.3 Feature Description
9.3.1 Fully Configurable Dual-Rail Design Allows Each Port to Operate Over the Full 1.2 V to 3.6 V
Power-Supply Range
Both V_CCA and V_CCB can be supplied at any voltage from 1.2 V to 3.6 V making the device suitable for translating
between any of the low voltage nodes (1.2 V, 1.8 V, 2.5 V, and 3.3 V).
9.3.2 Partial-Power-Down Mode Operation
The I_off circuitry will prevent backflow current by disabling I/O output circuits when device is in partial power-down
mode. This device is fully specified for partial-power-down applications using off output current (I_off). The I_off
circuitry disables the outputs, preventing damaging current backflow through the device when it is powered
down.
9.3.3 V_CC Isolation
The V_CC isolation feature ensures that if either V_CCA or V_CCB are at GND, both ports will be in a high-impedance
state (I_OZ shown in Electrical Characteristics). This prevents false logic levels from being presented to either bus.
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