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Texas Instruments SN74AXC2T-SMALLPKGEVM Evaluation module user's User guides
User's Guide
SCEU018 – July 2019
AXC2T-SMALLPKGEVM Evaluation Module
1
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Contents
Introduction ................................................................................................................... 2
Board Layout ................................................................................................................. 4
Schematic and Bill of Materials ............................................................................................ 4
List of Figures
1
AXC2T-SMALLPKGEVM with DTM and RSW packages .............................................................. 3
2
AXC2T-SMALLPKGEVM Layout .......................................................................................... 4
3
AXC2T-SMALLPKGEVM Schematic DTM and RSW Package........................................................ 4
List of Tables
1
SN74AXC2T45 Functional Table .......................................................................................... 2
2
SN74AVC2T245 Functional Table (Each 1-bit section) ................................................................ 2
3
AXC2T-SMALLPKGEVM Bill of Materials ................................................................................ 5
Trademarks
All trademarks are the property of their respective owners.
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1
Introduction
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Introduction
The AXC devices are a new family of direction controlled level translators from Texas Instruments. AXC
devices have dual-supply pins enabling configurable voltage translation between 0.65 V and 3.6 V and
any intermediate voltage ranges. Refer to the competitive advantages of the AXC Family in the application
report Power sequencing for the AXC family of devices (SCEA058). Watch Introduction to the AXC family
of direction controlled translation device.
The AXC2T-SMALLPKGEVM can be used to evaluate SN74AXC2T45 translator device in the DTM
package. Additionally, this EVM supports the SN74AVC2T245 device in the RSW package.
1.1
Features
The AXC family of direction controlled translation devices are dual-supply with configurable voltage
translation with an operating range from 0.65 V to 3.6 V. The A port is designed to track VCCA. VCCA
accepts any supply voltage from 0.65 V to 3.6 V. The B port is designed to track VCCB. VCCB accepts any
supply voltage from 0.65 V to 3.60 V.
The SN74AXC2T45 device is fully specified for partial-power-down applications using IOFF. The IOFF
circuitry disables the outputs, thus preventing damaging current backflow through the device when the
device is powered down. The VCC isolation feature ensures that if either VCC input is at ground, both A and
B data I/O ports are in the high-impedance state.
The eight channel SN74AXC8T245 device has two direction control pins, each controlling 4 data I/Os
enabling independent and simultaneous up and down translation. Refer to AXC-SMALLPKG1EVM for
evaluating the RJW package.
The four channel SN74AXC4T774 device has individual direction control pins for each of it's IO(A and B)
ports to allow configurable up and down translation. Refer to AXC4T774EVM for testing PW and RSV
package.
The AXC-SMALLPKG1EVM can be used to evaluate the DEA and DTQ packages of the SN74AXC1T45.
Refer to the low voltage translation for standard interfaces in the application report Low voltage translation
for SPI, UART, RGMII, and JTAG interfaces(SCEA065).
The functional table of the SN74AXC2T45 is listed in Table 1. The functional table of the SN74AVC2T245
is listed in Table 2.
Table 1. SN74AXC2T45 Functional Table
DIR
Signal Direction
L
B data to A bus
H
A data to B bus
Table 2. SN74AVC2T245 Functional Table (Each 1-bit section)
2
OE
DIRx
H
X
Signal Direction
Hi-Z
L
L
B data to A bus
L
H
A data to B bus
AXC2T-SMALLPKGEVM Evaluation Module
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Introduction
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Figure 1. AXC2T-SMALLPKGEVM with DTM and RSW packages
1.2
1.2.1
Hardware Description
Headers
The EVM has standard 100-mil headers with the side closer to the device connected to ground. The side
farther away from the device is mapped to the device pinout for easier connection as seen in Figure 1.
The silkscreen indicates the pin name.
1.2.2
Bypass Capacitors
C1 and C3 are the bypass capacitors for VCCA while C2 and C4 are the bypass capacitors for VCCB with a
value of 0.1 µF. C1, C2 are populated while C3, C4 are unpopulated.
1.2.3
DIR and OE Control Inputs
The direction pins and output enable pins are the control inputs of the devices and should never be left
floating. The CMOS inputs must be held at a known state, either VCC or ground, to ensure proper device
operation. Refer to Implications of Slow or Floating CMOS Inputs (SCBA004).
1.2.4
Optional SMB Connectors
The optional edge-mounted SMB connector pair supports high-speed operation on A1 and B1 data I/O
pins, while the corresponding header pins R1 and R2 have zero-ohm resistors populated.
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Board Layout
2
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Board Layout
Figure 2 illustrates the AXC2T-SMALLPKGEVM layout.
Figure 2. AXC2T-SMALLPKGEVM Layout
3
Schematic and Bill of Materials
3.1
Schematic
Figure 3 illustrates the AXC2T-SMALLPKGEVM schematic. The shaded portion of the schematic is not
populated on the physical board.
VCCA_RSW
VCCA_RSW
VCCB_RSW
VCCB_RSW
VCCB
B1
B2
VCCA_RSW
VCCB_RSW
GND
B1
B2
OE
GND
Figure 3. AXC2T-SMALLPKGEVM Schematic DTM and RSW Package
4
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Schematic and Bill of Materials
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3.2
Bill of Materials
Table 3 lists the AXC2T-SMALLPKGEVM bill of materials.
Table 3. AXC2T-SMALLPKGEVM Bill of Materials
Designator
Quantity Description
Package Reference Part Number
Manufacturer
C1, C2
2
CAP, CERM, 0.1 uF, 16 V, +/10%, X7R, 0402
0402
0402YC104KAT2A
AVX
J3, J4
2
Header, 100mil, 4x2, Gold, TH
4x2 Header
TSW-104-07-G-D
Samtec
R1, R2
2
RES, 0, 5%, 0.063 W, 0402
0402
MCR01MZPJ000
Rohm
U1
1
2-Bit Bus Transceiver with
Configurable Level-Shifting
DTM0008A
SN74AXC2T45DTM
TI
C3, C4
0
CAP, CERM, 0.1 uF, 16 V, +/10%, X7R, 0402
0402
0402YC104KAT2A
AVX
J1, J2
0
Header, 100mil, 5x2, Gold, TH
5x2 Header
TSW-105-07-G-D
Samtec
J5, J6
0
Connector, SMB Jack, End launch, SMB End launch
SMT
Jack, SMT
131-3701-801
Cinch Connectivity
U2
0
Dual-Bit, 2-DIR pin Dual-Supply
Bus Transceiver w/ Configurable
Voltage Translation
SN74AVC2T245RSW TI
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RSW0010A
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