74AVCH20T245
20-bit dual supply translating transceiver with configurable
voltage translation; 3-state
Rev. 6 — 14 January 2019 Product data sheet
1. General description
The 74AVCH20T245 is a 20-bit, dual supply transceiver that enables bi-directional voltage level
translation. The device can be used as two 10-bit transceivers or as a single 20-bit transceiver.
It features four 10-bit input-output ports (1An, 1Bn and 2An, 2Bn), two output enable inputs
(nOE), two direction inputs (nDIR) and dual supplies (V
CC(A)
and V
CC(B)
). V
CC(A)
and V
CC(B)
can
be independently supplied at any voltage between 0.8 V and 3.6 V making the device suitable for
bi-directional voltage level translation between any of the low voltage nodes: 0.8 V, 1.2 V, 1.5 V,
1.8 V, 2.5 V and 3.3 V. The 1An and 2An ports, nOE and nDIR are referenced to V
CC(A)
, the 1Bn
and 2Bn ports are referenced to V
CC(B)
. A HIGH on a 1DIR allows transmission from 1An to 1Bn
and a LOW on 1DIR allows transmission from 1Bn to 1An. A HIGH on nOE causes the outputs to
assume a HIGH impedance OFF-state.
The device is fully specified for partial power-down applications using I
OFF
. The I
OFF
circuitry
disables the output, preventing any damaging backflow current through the device when it is
powered down. In suspend mode when either V
CC(A)
or V
CC(B)
are at GND level, all output ports will
assume a high impedance OFF-state. The bus hold circuitry on the powered-up side always stays
active.
The 74AVCH20T245 has active bus hold circuitry which is provided to hold unused or floating
data inputs at a valid logic level. This feature eliminates the need for external pull-up or pull-down
resistors.
2. Features and benefits
• Wide supply voltage range:
• V
CC(A)
: 0.8 V to 3.6 V
• V
CC(B)
: 0.8 V to 3.6 V
• Complies with JEDEC standards:
• JESD8-12 (0.8 V to 1.3 V)
• JESD8-11 (0.9 V to 1.65 V)
• JESD8-7 (1.2 V to 1.95 V)
• JESD8-5 (1.8 V to 2.7 V)
• JESD8-B (2.7 V to 3.6 V)
• ESD protection:
• HBM JESD22-A114E Class 3B exceeds 8000 V
• MM JESD22-A115-A exceeds 200 V
• CDM JESD22-C101C exceeds 1000 V
