Datasheet

1. General description
The 74AVC20T245 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.
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-A114F Class 3B exceeds 8000 V
 MM JESD22-A115-A exceeds 200 V
 CDM JESD22-C101C exceeds 1000 V
 Maximum data rates:
 380 Mbit/s ( 1.8 V to 3.3 V translation)
 260 Mbit/s ( 1.1 V to 3.3 V translation)
 260 Mbit/s ( 1.1 V to 2.5 V translation)
 210 Mbit/s ( 1.1 V to 1.8 V translation)
74AVC20T245
20-bit dual supply translating transceiver with configurable
voltage translation; 3-state
Rev. 7 — 8 March 2012 Product data sheet