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SN74AXCH8T245
SCES876A – AUGUST 2018 – REVISED JANUARY 2019
SN74AXCH8T245 8-Bit Dual-Supply Bus Transceiver
with Configurable Voltage Translation, Tri-State Outputs, and Bus-Hold Circuitry
1 Features
•
1
•
•
•
•
•
•
•
•
•
Qualified Fully Configurable Dual-Rail Design
Allows Each Port to Operate With a Power Supply
Range From 0.65 V to 3.6 V
Operating Temperature From –40°C to +125°C
Bus-hold on Data Inputs Eliminates the Need for
External Pullup or Pulldown Resistors
Multiple Direction Control Pins to Allow
Simultaneous Up and Down Translation
Up to 380 Mbps support when translating from 1.8
V to 3.3 V
VCC Isolation Feature to Effectively Isolate Both
Buses in a Power-Down Scenario
Partial Power-Down Mode to Limit Backflow
Current in a Power-Down Scenario
Compatible With SN74AVCH8T245 and
74AVCH8T245 Level Shifters
Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
ESD Protection Exceeds JESD 22
– 8000-V Human-Body Model
– 1000-V Charged-Device Model
2 Applications
•
•
•
•
•
•
•
Enterprise and Communications
Wireless Infrastructure
Building Automation
Data Center Switches
Enterprise-Solid State Drive
Rack Server
EPOS
3 Description
The SN74AXCH8T245 device is an 8-bit noninverting bus transceiver that resolves voltage level
mismatch between devices operating at the latest
voltage nodes (0.7 V, 0.8 V, and 0.9 V) and devices
operating at industry standard voltage nodes (1.8 V,
2.5 V, 3.3 V) and vice versa.
The device operates by using two independent
power-supply rails (VCCA and VCCB) . Data pins A1
through A8 are designed to track VCCA, which accepts
any supply voltage from 0.65 V to 3.6 V. Data pins B1
through B8 are designed to track VCCB, which accepts
any supply voltage from 0.65 V to 3.6 V. Additionally
the SN74AXCH8T245 is compatible with a singlesupply system.
The SN74AXCH8T245 device is designed for
asynchronous communication between data buses.
The device transmits data from the A bus to the B
bus or from the B bus to the A bus, depending on the
logic level of the direction-control inputs (DIR1 and
DIR2). The output-enable (OE) input is used to
disable the outputs so the buses are effectively
isolated.
The SN74AXCH8T245 device is designed so the
control pins (DIR and OE) are referenced to VCCA.
Active bus-hold circuitry holds unused or undriven
inputs at a valid logic state. Use of pull-up or pulldown resistors with the bus-hold circuitry is not
recommended. If a supply is present for VCCA or
VCCB, the bus-hold circuitry always remains active on
all A and B ports respectively, independent of the
direction control or output enable.
This device is fully specified for partial-power-down
applications using Ioff. The Ioff circuitry disables the
outputs when the device is powered down. This
inhibits current backflow into the device which
prevents damage to the device.
The VCC isolation feature ensures that if either VCC
input supply is below 100 mV, all level shifter outputs
are disabled and placed into a high-impedance state.
To ensure the high-impedance state of the level
shifter I/Os during power up or power down, OE
should be tied to VCCA through a pull-up resistor; the
minimum value of the resistor is determined by the
current-sinking capability of the driver.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
SN74AXCH8T245PW
TSSOP (24)
7.80 mm × 4.40 mm
SN74AXCH8T245RHL
VQFN (24)
5.50 mm × 3.50 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Schematic
3.3 V
1.5 V
Processor
Control Block
VCCA DIR1 DIR2
VCCB
A1
B1
A2
B2
B3
A3
Data Block
A4
SN74AXCH8T245
B4
A5
B5
A6
B6
A8
Register Map
B7
A7
Interrupts
Power Management
GND
B8
Sensor Block
GND
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
SN74AXCH8T245
SCES876A – AUGUST 2018 – REVISED JANUARY 2019
www.ti.com
Table of Contents
1
2
3
4
5
6
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Pin Configuration and Functions .........................
Specifications.........................................................
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
6.10
6.11
6.12
6.13
6.14
7
1
1
1
2
3
4
Absolute Maximum Ratings ...................................... 4
ESD Ratings.............................................................. 4
Recommended Operating Conditions....................... 5
Thermal Information .................................................. 5
Electrical Characteristics........................................... 6
Switching Characteristics, VCCA = 0.7 V ................... 8
Switching Characteristics, VCCA = 0.8 V ................... 9
Switching Characteristics, VCCA = 0.9 V ................. 10
Switching Characteristics, VCCA = 1.2 V ................. 11
Switching Characteristics, VCCA = 1.5 V ............... 12
Switching Characteristics, VCCA = 1.8 V ............... 13
Switching Characteristics, VCCA = 2.5 V ............... 14
Switching Characteristics, VCCA = 3.3 V ............... 15
Operating Characteristics: TA = 25°C ................... 16
Parameter Measurement Information ................ 18
8
Detailed Description ............................................ 20
8.1
8.2
8.3
8.4
9
Overview .................................................................
Functional Block Diagram .......................................
Feature Description.................................................
Device Functional Modes........................................
20
20
21
21
Application and Implementation ........................ 22
9.1 Application Information............................................ 22
9.2 Typical Application ................................................. 22
10 Power Supply Recommendations ..................... 24
11 Layout................................................................... 24
11.1 Layout Guidelines ................................................. 24
11.2 Layout Example .................................................... 24
12 Device and Documentation Support ................. 25
12.1
12.2
12.3
12.4
12.5
12.6
Documentation Support .......................................
Receiving Notification of Documentation Updates
Community Resources..........................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
25
25
25
25
25
25
13 Mechanical, Packaging, and Orderable
Information ........................................................... 26
4 Revision History
Changes from Original (August 2018) to Revision A
Page
•
Added RHL package to Device Information table .................................................................................................................. 1
•
Added RHL package pinout ................................................................................................................................................... 3
•
Added RHL package to Thermal Information table ............................................................................................................... 5
2
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SCES876A – AUGUST 2018 – REVISED JANUARY 2019
5 Pin Configuration and Functions
DIR1
A1
A2
A3
A4
A5
A6
A7
A8
DIR2
(1)
VCCB
OE
21 B1
20 B2
19 B3
18 B4
17 B5
16 B6
15 B7
14 B8
VCCB
24
2
23
3
22
4
5
6
PAD
7
8
9
10
11
13
VCCB
VCCB
OE
B1
B2
B3
B4
B5
B6
B7
B8
GND
GND
24
23
22
21
20
19
18
17
16
15
14
13
VCCA
1
2
3
4
5
6
7
8
9
10
11
12
GND 12
VCCA
DIR1
A1
A2
A3
A4
A5
A6
A7
A8
DIR2
GND
1
RHL Package (1)
24-Pin VQFN
Top View
PW Package
24-Pin TSSOP
Top View
PAD - may be grounded (recommended) or left floating.
Pin Functions
PIN
NAME
PW, RHL
I/O
DESCRIPTION
A1
3
I/O
Input/output A1. Referenced to VCCA.
A2
4
I/O
Input/output A2. Referenced to VCCA.
A3
5
I/O
Input/output A3. Referenced to VCCA.
A4
6
I/O
Input/output A4. Referenced to VCCA.
A5
7
I/O
Input/output A5. Referenced to VCCA.
A6
8
I/O
Input/output A6. Referenced to VCCA.
A7
9
I/O
Input/output A7. Referenced to VCCA.
A8
10
I/O
Input/output A8. Referenced to VCCA.
B1
21
I/O
Input/output B1. Referenced to VCCB.
B2
20
I/O
Input/output B2. Referenced to VCCB.
B3
19
I/O
Input/output B3. Referenced to VCCB.
B4
18
I/O
Input/output B4. Referenced to VCCB.
B5
17
I/O
Input/output B5. Referenced to VCCB.
B6
16
I/O
Input/output B6. Referenced to VCCB.
B7
15
I/O
Input/output B7. Referenced to VCCB.
B8
14
I/O
Input/output B8. Referenced to VCCB.
DIR1
2
I
Direction-control signal. Referenced to VCCA.
DIR2
11
I
Direction-control signal. Referenced to VCCA. See Multiple Direction Control Pins for
additional details. Tie to GND to maintain backwards compatibility with the SN74AVCH8T245
device.
12
—
Ground
13
—
Ground
OE
22
I
VCCA
1
—
A-port supply voltage. 0.65 V ≤ VCCA ≤ 3.6 V
23
—
B-port supply voltage. 0.65 V ≤ VCCB ≤ 3.6 V
24
—
B-port supply voltage. 0.65 V ≤ VCCB ≤ 3.6 V
GND
VCCB
Output Enable. Pull to GND to enable all outputs. Pull to VCCA to place all outputs in highimpedance mode. Referenced to VCCA.
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6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1)
Supply voltage, VCCA
Supply voltage, VCCB
MIN
MAX
UNIT
–0.5
4.2
V
V
–0.5
4.2
I/O ports (A port)
–0.5
4.2
I/O ports (B port)
–0.5
4.2
Control inputs
–0.5
4.2
A port
–0.5
4.2
B port
–0.5
4.2
A port
–0.5
VCCA + 0.2
B port
–0.5
VCCB + 0.2
Input clamp current, IIK
VI < 0
–50
mA
Output clamp current, IOK
VO < 0
–50
mA
Input voltage, VI (2)
Voltage applied to any output
in the high-impedance or power-off state, VO (2)
Voltage applied to any output in the high or low state, VO (2)
(3)
V
V
V
Continuous output current, IO
–50
50
mA
Continuous current through VCCA, VCCB, or GND
–100
100
mA
150
°C
150
°C
Junction Temperature, TJ
Storage temperature, Tstg
(1)
(2)
(3)
–65
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
The input voltage and output negative-voltage ratings may be exceeded if the input and output current ratings are observed.
The output positive-voltage rating may be exceeded up to 4.2 V maximum if the output current rating is observed.
6.2 ESD Ratings
VALUE
V(ESD)
(1)
(2)
4
Electrostatic discharge
Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1)
±8000
Charged-device model (CDM), per JEDEC specification JESD22-C101 (2)
±1000
UNIT
V
JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
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SCES876A – AUGUST 2018 – REVISED JANUARY 2019
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
(1) (2) (3)
MIN
MAX
UNIT
VCCA
Supply voltage
0.65
3.6
V
VCCB
Supply voltage
0.65
3.6
V
Data inputs
VIH
VCCI = 0.65 V - 0.75 V
VCCI × 0.70
VCCI = 0.76 V - 1 V
VCCI × 0.70
VCCI = 1.1 V - 1.95 V
VCCI × 0.65
VCCI = 2.3 V - 2.7 V
1.6
VCCI = 3 V - 3.6 V
High-level input voltage
Control inputs
(DIR, OE)
Referenced to VCCA
2
VCCA = 0.65 V - 0.75 V
VCCA × 0.70
VCCA = 0.76 V - 1 V
VCCA × 0.70
VCCA = 1.1 V - 1.95 V
VCCA × 0.65
VCCA = 2.3 V - 2.7 V
1.6
VCCA = 3 V - 3.6 V
Data inputs
VIL
Low-level input voltage
Control inputs
(DIR, OE)
Referenced to VCCA
V
2
VCCI = 0.65 V - 0.75 V
VCCI × 0.30
VCCI = 0.76 V - 1 V
VCCI × 0.30
VCCI = 1.1 V - 1.95 V
VCCI × 0.35
VCCI = 2.3 V - 2.7 V
0.7
VCCI = 3 V - 3.6 V
0.8
VCCA = 0.65 V - 0.75 V
VCCA × 0.30
VCCA = 0.76 V - 1 V
VCCA × 0.30
VCCA = 1.1 V - 1.95 V
VCCA × 0.35
VCCA = 2.3 V - 2.7 V
0.7
VCCA = 3 V - 3.6 V
VO
Output voltage
Δt/Δv
Input transition rise or fall rate
TA
Operating free-air temperature
(1)
(2)
(3)
0.8
Input voltage (3)
VI
V
0
3.6
Active state
0
VCCO
V
Tri-state
0
3.6
10
ns/V
–40
125
°C
(2)
V
VCCI is the VCC associated with the input port.
VCCO is the VCC associated with the output port.
All unused data inputs of the device must be held at VCCI or GND to ensure proper device operation. See the Implications of Slow or
Floating CMOS Inputs application report.
6.4 Thermal Information
SN74AXCH8T245
THERMAL METRIC
(1)
PW (TSSOP)
RHL (VQFN)
24 PINS
24 PINS
UNIT
RθJA
Junction-to-ambient thermal resistance
101.7
35
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
45.4
39.9
°C/W
RθJB
Junction-to-board thermal resistance
56.9
13.8
°C/W
ψJT
Junction-to-top characterization parameter
7.0
0.3
°C/W
ψJB
Junction-to-board characterization parameter
56.4
13.8
°C/W
RθJC(bot)
Junction-to-case (bottom) thermal resistance
N/A
1.4
°C/W
(1)
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
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6.5 Electrical Characteristics
Over recommended operating free-air temperature range (unless otherwise noted) (1)
PARAMETER
High-level
output
voltage
VOH
Low-level
output
voltage
VOL
Bus-hold
low
sustaining
current (3)
IBHL
Bus-hold
high
sustaining
current (4)
IBHH
IBHLO
(1)
(2)
(3)
(4)
(5)
6
Bus-hold
low
overdrive
current (5)
TEST CONDITIONS
–40°C to 85°C
–40°C to 125°C
VCCA
VCCB
IOH = –100 µA
0.7 V - 3.6 V
0.7 V - 3.6 V
VCCO – 0.1
VCCO – 0.1
IOH = –50 µA
0.65 V
0.65 V
0.55
0.55
IOH = –200 µA
0.76 V
0.76 V
0.58
0.58
IOH = –500 µA
0.85 V
0.85 V
0.65
0.65
IOH = -3 mA
1.1 V
1.1 V
0.85
0.85
IOH = -6 mA
1.4 V
1.4 V
1.05
1.05
IOH = -8 mA
1.65 V
1.65 V
1.2
1.2
IOH = -9 mA
2.3 V
2.3 V
1.75
1.75
IOH = -12 mA
3V
3V
2.3
2.3
IOL = 100 µA
0.7 V - 3.6 V
0.7 V - 3.6 V
0.1
IOL = 50 µA
0.65 V
0.65 V
0.1
0.1
IOL = 200 µA
0.76 V
0.76 V
0.18
0.18
IOL = 500 µA
0.85 V
0.85 V
0.2
0.2
IOL = 3 mA
1.1 V
1.1 V
0.25
0.25
IOL = 6 mA
1.4 V
1.4 V
0.35
0.35
IOL = 8 mA
1.65 V
1.65 V
0.45
0.45
IOL = 9 mA
2.3 V
2.3 V
0.55
0.55
IOL = 12 mA
3V
3V
0.7
VI= 0.20 V
0.65 V
0.65 V
VI= 0.23 V
0.76 V
0.76 V
8
7
VI= 0.26 V
0.85 V
0.85 V
10
10
VI= 0.39 V
1.1 V
1.1 V
20
20
VI= 0.49 V
1.4 V
1.4 V
40
30
VI= 0.58 V
1.65 V
1.65 V
55
45
VI= 0.7 V
2.3 V
2.3 V
90
80
VI= 0.8 V
3V
3V
145
135
VI= 0.45 V
0.65 V
0.65 V
–4
–4
VI= 0.53 V
0.76 V
0.76 V
–8
–7
VI= 0.59 V
0.85 V
0.85 V
–10
–10
VI= 0.71 V
1.1 V
1.1 V
–20
–20
VI= 0.91 V
1.4 V
1.4 V
–40
–30
VI= 1.07 V
1.65 V
1.65 V
–55
–45
VI= 1.6 V
2.3 V
2.3 V
–90
–80
VI= 2.0 V
3V
3V
–145
–135
0.75 V
0.75 V
40
40
0.84 V
0.84 V
50
50
0.95 V
0.95 V
65
65
1.3 V
1.3 V
105
105
1.6 V
1.6 V
150
150
1.95 V
1.95 V
205
205
2.7 V
2.7 V
335
335
3.6V
3.6V
480
480
VI = VIH
VI = VIL
VI= 0 to VCC
MIN
4
TYP (2)
MAX
MIN
TYP (2)
MAX
UNIT
V
0.1
V
0.7
4
µA
µA
µA
VCCO is the VCC associated with the output port.
All typical values are for TA = 25°C.
The bus-hold circuit can sink at least the minimum low sustaining current at VIL(MAX). IBHL should be measured after lowering VI to
GND and then raising it to VIL(MAX).
The bus-hold circuit can source at least the minimum high sustaining current at VIH(MIN). IBHH should be measured after raising VI to
VCC and then lowering it to VIH(MIN).
An external driver must source at least IBHLO to switch this node from low to high.
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Electrical Characteristics (continued)
Over recommended operating free-air temperature range (unless otherwise noted)(1)
PARAMETER
IBHHO
Bus-hold
high
overdrive
current (6)
II
Input
leakage
current
Ioff
Partial
power
down
current
IOZ
ICCA
ICCB
Highimpedance
state output
current
TEST CONDITIONS
–40°C to 125°C
VCCB
0.75 V
0.75 V
–40
–40
0.84 V
0.84 V
–50
–50
0.95 V
0.95 V
–65
–65
1.3 V
1.3 V
–105
–105
1.6 V
1.6 V
–150
–150
1.95 V
1.95 V
–205
–205
2.7 V
2.7 V
–335
–335
3.6V
3.6V
–480
–480
0.65 V - 3.6 V
0.65 V - 3.6
V
–0.5
0.5
–1
1
A Port:
VI or VO = 0 V - 3.6 V
0V
0 V - 3.6 V
–8
8
–12
12
B Port:
VI or VO = 0 V - 3.6 V
0 V - 3.6 V
0V
–8
8
–12
12
A Port:
VO = VCCO or GND, VI = VCCI
or GND, OE = VIH
3.6 V
3.6 V
–8
8
–12
12
B Port:
VO = VCCO or GND, VI = VCCI
or GND, OE = VIH
3.6 V
3.6 V
0.65 V - 3.6 V
0.65 V - 3.6
V
0V
3.6 V
VI= 0 to VCC
Control Inputs (DIR, OE):
VI = VCCA or GND
TYP (2)
MAX
MIN
TYP (2)
MAX
UNIT
µA
µA
µA
–8
8
–12
12
20
–2
42
µA
–12
3.6 V
0V
13
27
0.65 V - 3.6 V
0.65 V - 3.6
V
20
40
0V
3.6 V
13
27
3.6 V
0V
0.65 V - 3.6 V
0.65 V - 3.6
V
VCCB supply
VI = VCCI or GND, IO = 0 mA
current
VI = VCCI or GND, IO = 0 mA
MIN
µA
VCCA supply
VI = VCCI or GND, IO = 0 mA
current
Combined
ICCA +
supply
ICCB
current
–40°C to 85°C
VCCA
–2
µA
–12
30
60
µA
Ci
Input
capacitance
Control Inputs (DIR, OE):
VI = 3.3 V or GND
3.3 V
3.3 V
4.5
4.5
pF
Cio
Data I/O
capacitance
Ports A and B:
OE = VCCA, VO = 1.65V DC +
1 MHz -16 dBm sine wave
3.3 V
3.3 V
7.3
7.3
pF
(6)
An external driver must sink at least IBHHO to switch this node from high to low.
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6.6 Switching Characteristics, VCCA = 0.7 V
See Figure 1 and Figure 2 for test circuit and loading conditions. See Figure 3 and Figure 4 for measurement waveforms.
B-PORT SUPPLY VOLTAGE (VCCB)
PARAMETER
tpd
tdis
ten
Propagation
delay
Disable
time
TEST
CONDITION
0.7 V ± 0.05 V
0.8 V ± 0.04 V
MIN
MAX
MIN
MAX
0.9 V ± 0.045 V
MIN
MAX
MIN
1.2 V ± 0.1 V
MAX
A input to
B output
–40°C to 85°C
0.5
178
0.5
115
0.5
83
0.5
49
–40°C to 125°C
0.5
178
0.5
115
0.5
83
0.5
49
B input to
A output
–40°C to 85°C
0.5
178
0.5
159
0.5
132
0.5
94
–40°C to 125°C
0.5
178
0.5
159
0.5
132
0.5
94
OE input to
A output
–40°C to 85°C
0.5
194
0.5
194
0.5
194
0.5
194
–40°C to 125°C
0.5
194
0.5
194
0.5
194
0.5
194
OE input to
B output
–40°C to 85°C
0.5
216
0.5
179
0.5
158
0.5
78
–40°C to 125°C
0.5
216
0.5
179
0.5
158
0.5
78
OE input to
A output
–40°C to 85°C
0.5
240
0.5
240
0.5
240
0.5
240
–40°C to 125°C
0.5
240
0.5
240
0.5
240
0.5
240
OE input to
B output
–40°C to 85°C
0.5
292
0.5
180
0.5
125
0.5
76
–40°C to 125°C
0.5
292
0.5
180
0.5
125
0.5
76
Enable time
UNIT
ns
ns
ns
B-PORT SUPPLY VOLTAGE (VCCB)
PARAMETER
tpd
tdis
ten
8
Propagation
delay
TEST
CONDITION
1.5 V ± 0.1 V
1.8 V ± 0.15 V
2.5 V ± 0.2 V
3.3 V ± 0.3 V
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
A input to
B output
–40°C to 85°C
0.5
47
0.5
50
0.5
62
0.5
151
–40°C to 125°C
0.5
47
0.5
50
0.5
62
0.5
151
B input to
A output
–40°C to 85°C
0.5
89
0.5
88
0.5
87
0.5
86
–40°C to 125°C
0.5
89
0.5
88
0.5
87
0.5
86
OE input to
A output
–40°C to 85°C
0.5
194
0.5
194
0.5
194
0.5
194
–40°C to 125°C
0.5
194
0.5
194
0.5
194
0.5
194
OE input to
B output
–40°C to 85°C
0.5
70
0.5
69
0.5
67
0.5
101
–40°C to 125°C
0.5
70
0.5
69
0.5
67
0.5
101
OE input to
A output
–40°C to 85°C
0.5
240
0.5
240
0.5
240
0.5
240
–40°C to 125°C
0.5
240
0.5
240
0.5
240
0.5
240
OE input to
B output
–40°C to 85°C
0.5
69
0.5
69
0.5
84
0.5
552
–40°C to 125°C
0.5
69
0.5
69
0.5
84
0.5
552
Disable time
Enable time
Submit Documentation Feedback
UNIT
ns
ns
ns
Copyright © 2018–2019, Texas Instruments Incorporated
Product Folder Links: SN74AXCH8T245
SN74AXCH8T245
www.ti.com
SCES876A – AUGUST 2018 – REVISED JANUARY 2019
6.7 Switching Characteristics, VCCA = 0.8 V
See Figure 1 and Figure 2 for test circuit and loading conditions. See Figure 3 and Figure 4 for measurement waveforms.
B-PORT SUPPLY VOLTAGE (VCCB)
PARAMETER
tpd
tdis
ten
Propagation
delay
Disable
time
TEST
CONDITION
0.7 V ± 0.05 V
0.8 V ± 0.04 V
0.9 V ± 0.045 V
1.2 V ± 0.1 V
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
A input to
B output
–40°C to 85°C
0.5
159
0.5
96
0.5
64
0.5
33
–40°C to 125°C
0.5
159
0.5
96
0.5
64
0.5
33
B input to
A output
–40°C to 85°C
0.5
117
0.5
97
0.5
79
0.5
54
–40°C to 125°C
0.5
117
0.5
97
0.5
79
0.5
54
OE input
to A output
–40°C to 85°C
0.5
154
0.5
154
0.5
154
0.5
154
–40°C to 125°C
0.5
154
0.5
154
0.5
154
0.5
154
OE input
to B output
–40°C to 85°C
0.5
202
0.5
165
0.5
144
0.5
65
–40°C to 125°C
0.5
202
0.5
165
0.5
144
0.5
65
OE input
to A output
–40°C to 85°C
0.5
137
0.5
137
0.5
137
0.5
137
–40°C to 125°C
0.5
137
0.5
137
0.5
137
0.5
137
OE input
to B output
–40°C to 85°C
0.5
270
0.5
160
0.5
104
0.5
55
–40°C to 125°C
0.5
270
0.5
160
0.5
104
0.5
55
Enable time
UNIT
ns
ns
ns
B-PORT SUPPLY VOLTAGE (VCCB)
PARAMETER
tpd
tdis
ten
Propagation
delay
TEST
CONDITION
1.5 V ± 0.1 V
1.8 V ± 0.15 V
2.5 V ± 0.2 V
3.3 V ± 0.3 V
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
A input to
B output
–40°C to 85°C
0.5
27
0.5
26
0.5
26
0.5
35
–40°C to 125°C
0.5
27
0.5
26
0.5
26
0.5
35
B input to
A output
–40°C to 85°C
0.5
44
0.5
43
0.5
42
0.5
41
–40°C to 125°C
0.5
44
0.5
43
0.5
42
0.5
41
OE input to
A output
–40°C to 85°C
0.5
154
0.5
154
0.5
154
0.5
154
–40°C to 125°C
0.5
154
0.5
154
0.5
154
0.5
154
OE input to
B output
–40°C to 85°C
0.5
57
0.5
55
0.5
50
0.5
52
–40°C to 125°C
0.5
57
0.5
55
0.5
50
0.5
52
OE input to
A output
–40°C to 85°C
0.5
137
0.5
137
0.5
137
0.5
137
–40°C to 125°C
0.5
137
0.5
137
0.5
137
0.5
137
OE input to
B output
–40°C to 85°C
0.5
46
0.5
44
0.5
46
0.5
59
–40°C to 125°C
0.5
46
0.5
44
0.5
46
0.5
59
Disable time
Enable time
Submit Documentation Feedback
Copyright © 2018–2019, Texas Instruments Incorporated
Product Folder Links: SN74AXCH8T245
UNIT
ns
ns
ns
9
SN74AXCH8T245
SCES876A – AUGUST 2018 – REVISED JANUARY 2019
www.ti.com
6.8 Switching Characteristics, VCCA = 0.9 V
See Figure 1 and Figure 2 for test circuit and loading conditions. See Figure 3 and Figure 4 for measurement waveforms.
B-PORT SUPPLY VOLTAGE (VCCB)
PARAMETER
tpd
tdis
ten
Propagation
delay
Disable
time
TEST
CONDITION
0.7 V ± 0.05 V
0.8 V ± 0.04 V
MIN
MAX
MIN
MAX
0.9 V ± 0.045 V
MIN
MAX
1.2 V ± 0.1 V
MIN
MAX
A input to
output
–40°C to 85°C
0.5
133
0.5
79
0.5
53
0.5
23
–40°C to 125°C
0.5
133
0.5
79
0.5
53
0.5
23
B input to
A output
–40°C to 85°C
0.5
84
0.5
64
0.5
53
0.5
41
–40°C to 125°C
0.5
84
0.5
64
0.5
53
0.5
41
OE input to
A output
–40°C to 85°C
0.5
130
0.5
130
0.5
130
0.5
130
–40°C to 125°C
0.5
130
0.5
130
0.5
130
0.5
130
OE input to
B output
–40°C to 85°C
0.5
193
0.5
157
0.5
137
0.5
57
–40°C to 125°C
0.5
193
0.5
157
0.5
137
0.5
57
OE input to
A output
–40°C to 85°C
0.5
128
0.5
128
0.5
128
0.5
128
–40°C to 125°C
0.5
128
0.5
128
0.5
128
0.5
128
OE input to
B output
–40°C to 85°C
0.5
257
0.5
149
0.5
94
0.5
45
–40°C to 125°C
0.5
257
0.5
149
0.5
94
0.5
45
Enable time
UNIT
ns
ns
ns
B-PORT SUPPLY VOLTAGE (VCCB)
PARAMETER
tpd
tdis
ten
10
Propagation
delay
TEST
CONDITION
1.5 V ± 0.1 V
1.8 V ± 0.15 V
2.5 V ± 0.2 V
3.3 V ± 0.3 V
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
A input to
B output
–40°C to 85°C
0.5
18
0.5
16
0.5
15
0.5
18
–40°C to 125°C
0.5
18
0.5
16
0.5
15
0.5
18
B input to
A output
–40°C to 85°C
0.5
29
0.5
25
0.5
23
0.5
22
–40°C to 125°C
0.5
29
0.5
25
0.5
23
0.5
22
OE input to
A output
–40°C to 85°C
0.5
130
0.5
130
0.5
130
0.5
130
–40°C to 125°C
0.5
130
0.5
130
0.5
130
0.5
130
OE input to
B output
–40°C to 85°C
0.5
50
0.5
48
0.5
42
0.5
43
–40°C to 125°C
0.5
50
0.5
48
0.5
42
0.5
43
OE input to
A output
–40°C to 85°C
0.5
128
0.5
128
0.5
128
0.5
128
–40°C to 125°C
0.5
128
0.5
128
0.5
128
0.5
128
OE input to
B output
–40°C to 85°C
0.5
37
0.5
34
0.5
32
0.5
36
–40°C to 125°C
0.5
37
0.5
34
0.5
32
0.5
36
Disable time
Enable time
Submit Documentation Feedback
UNIT
ns
ns
ns
Copyright © 2018–2019, Texas Instruments Incorporated
Product Folder Links: SN74AXCH8T245
SN74AXCH8T245
www.ti.com
SCES876A – AUGUST 2018 – REVISED JANUARY 2019
6.9 Switching Characteristics, VCCA = 1.2 V
See Figure 1 and Figure 2 for test circuit and loading conditions. See Figure 3 and Figure 4 for measurement waveforms.
B-PORT SUPPLY VOLTAGE (VCCB)
PARAMETER
tpd
tdis
ten
Propagation
delay
TEST
CONDITION
0.7 V ± 0.05 V
0.8 V ± 0.04 V
0.9 V ± 0.045 V
1.2 V ± 0.1 V
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
A input to
B output
–40°C to 85°C
0.5
95
0.5
54
0.5
40
0.5
15
–40°C to 125°C
0.5
95
0.5
54
0.5
40
0.5
15
B input to
A output
–40°C to 85°C
0.5
49
0.5
33
0.5
23
0.5
15
–40°C to 125°C
0.5
49
0.5
33
0.5
23
0.5
15
OE input to
A output
–40°C to 85°C
0.5
47
0.5
47
0.5
47
0.5
47
–40°C to 125°C
0.5
47
0.5
47
0.5
47
0.5
47
OE input to
B output
–40°C to 85°C
0.5
181
0.5
147
0.5
127
0.5
49
–40°C to 125°C
0.5
181
0.5
147
0.5
127
0.5
49
OE input to
A output
–40°C to 85°C
0.5
40
0.5
40
0.5
40
0.5
40
–40°C to 125°C
0.5
40
0.5
40
0.5
40
0.5
40
OE input to
B output
–40°C to 85°C
0.5
221
0.5
132
0.5
81
0.5
34
–40°C to 125°C
0.5
221
0.5
132
0.5
81
0.5
34
Disable time
Enable time
UNIT
ns
ns
ns
B-PORT SUPPLY VOLTAGE (VCCB)
PARAMETER
tpd
tdis
ten
Propagation
delay
TEST
CONDITION
1.5 V ± 0.1 V
1.8 V ± 0.15 V
2.5 V ± 0.2 V
3.3 V ± 0.3 V
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
A input to
B output
–40°C to 85°C
0.5
11
0.5
9
0.5
8
0.5
8
–40°C to 125°C
0.5
11
0.5
9
0.5
8
0.5
8
B input to
A output
–40°C to 85°C
0.5
12
0.5
10
0.5
8
0.5
8
–40°C to 125°C
0.5
12
0.5
10
0.5
8
0.5
8
OE input to
A output
–40°C to 85°C
0.5
47
0.5
47
0.5
47
0.5
47
–40°C to 125°C
0.5
47
0.5
47
0.5
47
0.5
47
OE input to
B output
–40°C to 85°C
0.5
42
0.5
40
0.5
34
0.5
34
–40°C to 125°C
0.5
42
0.5
40
0.5
34
0.5
34
OE input to
A output
–40°C to 85°C
0.5
39
0.5
40
0.5
40
0.5
40
–40°C to 125°C
0.5
39
0.5
40
0.5
40
0.5
40
OE input to
B output
–40°C to 85°C
0.5
25
0.5
22
0.5
20
0.5
19
–40°C to 125°C
0.5
25
0.5
22
0.5
20
0.5
19
Disable time
Enable time
Submit Documentation Feedback
Copyright © 2018–2019, Texas Instruments Incorporated
Product Folder Links: SN74AXCH8T245
UNIT
ns
ns
ns
11
SN74AXCH8T245
SCES876A – AUGUST 2018 – REVISED JANUARY 2019
www.ti.com
6.10 Switching Characteristics, VCCA = 1.5 V
See Figure 1 and Figure 2 for test circuit and loading conditions. See Figure 3 and Figure 4 for measurement waveforms.
B-PORT SUPPLY VOLTAGE (VCCB)
PARAMETER
tpd
tdis
ten
Propagation
delay
TEST
CONDITION
0.7 V ± 0.05 V
0.8 V ± 0.04 V
MIN
MAX
MIN
MAX
0.9 V ± 0.045 V
MIN
MAX
1.2 V ± 0.1 V
MIN
MAX
A input to
B output
–40°C to 85°C
0.5
90
0.5
44
0.5
29
0.5
12
–40°C to 125°C
0.5
90
0.5
44
0.5
29
0.5
12
B input to
A output
–40°C to 85°C
0.5
47
0.5
27
0.5
18
0.5
11
–40°C to 125°C
0.5
47
0.5
27
0.5
18
0.5
11
OE input to
A output
–40°C to 85°C
0.5
37
0.5
37
0.5
37
0.5
37
–40°C to 125°C
0.5
37
0.5
37
0.5
37
0.5
37
OE input to
B output
–40°C to 85°C
0.5
176
0.5
142
0.5
122
0.5
44
–40°C to 125°C
0.5
176
0.5
142
0.5
122
0.5
44
OE input to
A output
–40°C to 85°C
0.5
25
0.5
25
0.5
25
0.5
25
–40°C to 125°C
0.5
25
0.5
25
0.5
25
0.5
25
OE input to
B output
–40°C to 85°C
0.5
214
0.5
114
0.5
71
0.5
29
–40°C to 125°C
0.5
214
0.5
114
0.5
71
0.5
29
Disable time
Enable time
UNIT
ns
ns
ns
B-PORT SUPPLY VOLTAGE (VCCB)
PARAMETER
tpd
tdis
ten
12
Propagation
delay
TEST
CONDITION
1.5 V ± 0.1 V
1.8 V ± 0.15 V
2.5 V ± 0.2 V
3.3 V ± 0.3 V
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
A input to
B output
–40°C to 85°C
0.5
9
0.5
8
0.5
6
0.5
6
–40°C to 125°C
0.5
9
0.5
8
0.5
6
0.5
6
B input to
A output
–40°C to 85°C
0.5
9
0.5
8
0.5
6
0.5
5
–40°C to 125°C
0.5
9
0.5
8
0.5
6
0.5
5
OE input to
A output
–40°C to 85°C
0.5
37
0.5
37
0.5
37
0.5
37
–40°C to 125°C
0.5
37
0.5
37
0.5
37
0.5
37
OE input to
B output
–40°C to 85°C
0.5
38
0.5
37
0.5
31
0.5
31
–40°C to 125°C
0.5
38
0.5
37
0.5
31
0.5
31
OE input to
A output
–40°C to 85°C
0.5
25
0.5
25
0.5
25
0.5
25
–40°C to 125°C
0.5
25
0.5
25
0.5
25
0.5
25
OE input to
B output
–40°C to 85°C
0.5
21
0.5
18
0.5
15
0.5
13
–40°C to 125°C
0.5
21
0.5
18
0.5
15
0.5
13
Disable time
Enable time
Submit Documentation Feedback
UNIT
ns
ns
ns
Copyright © 2018–2019, Texas Instruments Incorporated
Product Folder Links: SN74AXCH8T245
SN74AXCH8T245
www.ti.com
SCES876A – AUGUST 2018 – REVISED JANUARY 2019
6.11 Switching Characteristics, VCCA = 1.8 V
See Figure 1 and Figure 2 for test circuit and loading conditions. See Figure 3 and Figure 4 for measurement waveforms.
B-PORT SUPPLY VOLTAGE (VCCB)
PARAMETER
tpd
tdis
ten
Propagation
delay
TEST
CONDITION
0.7 V ± 0.05 V
0.8 V ± 0.04 V
0.9 V ± 0.045 V
1.2 V ± 0.1 V
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
A input to
B output
–40°C to 85°C
0.5
88
0.5
43
0.5
25
0.5
10
–40°C to 125°C
0.5
88
0.5
43
0.5
25
0.5
10
B input to
A output
–40°C to 85°C
0.5
50
0.5
26
0.5
16
0.5
9
–40°C to 125°C
0.5
50
0.5
26
0.5
16
0.5
9
OE input to
A output
–40°C to 85°C
0.5
35
0.5
35
0.5
35
0.5
35
–40°C to 125°C
0.5
35
0.5
35
0.5
35
0.5
35
OE input to
B output
–40°C to 85°C
0.5
174
0.5
139
0.5
119
0.5
42
–40°C to 125°C
0.5
174
0.5
139
0.5
119
0.5
42
OE input to
A output
–40°C to 85°C
0.5
20
0.5
20
0.5
20
0.5
20
–40°C to 125°C
0.5
20
0.5
20
0.5
20
0.5
20
OE input to
B output
–40°C to 85°C
0.5
213
0.5
111
0.5
67
0.5
27
–40°C to 125°C
0.5
213
0.5
111
0.5
67
0.5
27
Disable time
Enable time
UNIT
ns
ns
ns
B-PORT SUPPLY VOLTAGE (VCCB)
PARAMETER
tpd
tdis
ten
Propagation
delay
Disable
time
TEST
CONDITION
1.5 V ± 0.1 V
1.8 V ± 0.15 V
2.5 V ± 0.2 V
3.3 V ± 0.3 V
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
A input to
B output
–40°C to 85°C
0.5
8
0.5
7
0.5
6
0.5
5
–40°C to 125°C
0.5
8
0.5
7
0.5
6
0.5
5
B input to
A output
–40°C to 85°C
0.5
7
0.5
6
0.5
5
0.5
4
–40°C to 125°C
0.5
7
0.5
7
0.5
5
0.5
4
OE input to
A output
–40°C to 85°C
0.5
35
0.5
35
0.5
35
0.5
35
–40°C to 125°C
0.5
35
0.5
35
0.5
35
0.5
35
OE input to
B output
–40°C to 85°C
0.5
36
0.5
35
0.5
30
0.5
29
–40°C to 125°C
0.5
36
0.5
35
0.5
30
0.5
29
OE input to
A output
–40°C to 85°C
0.5
20
0.5
20
0.5
20
0.5
20
–40°C to 125°C
0.5
20
0.5
20
0.5
20
0.5
20
OE input to
B output
–40°C to 85°C
0.5
19
0.5
16
0.5
13
0.5
11
–40°C to 125°C
0.5
19
0.5
16
0.5
13
0.5
11
Enable time
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UNIT
ns
ns
ns
13
SN74AXCH8T245
SCES876A – AUGUST 2018 – REVISED JANUARY 2019
www.ti.com
6.12 Switching Characteristics, VCCA = 2.5 V
See Figure 1 and Figure 2 for test circuit and loading conditions. See Figure 3 and Figure 4 for measurement waveforms.
B-PORT SUPPLY VOLTAGE (VCCB)
PARAMETER
tpd
tdis
ten
Propagation
delay
Disable
time
TEST
CONDITION
0.7 V ± 0.05 V
0.8 V ± 0.04 V
MIN
MAX
MIN
MAX
0.9 V ± 0.045 V
MIN
MAX
1.2 V ± 0.1 V
MIN
MAX
A input to
B output
–40°C to 85°C
0.5
87
0.5
42
0.5
23
0.5
8
–40°C to 125°C
0.5
87
0.5
42
0.5
23
0.5
8
B input to
A output
–40°C to 85°C
0.5
62
0.5
26
0.5
15
0.5
8
–40°C to 125°C
0.5
62
0.5
26
0.5
15
0.5
8
OE input to
A output
–40°C to 85°C
0.5
28
0.5
28
0.5
28
0.5
28
–40°C to 125°C
0.5
28
0.5
28
0.5
28
0.5
28
OE input to
B output
–40°C to 85°C
0.5
173
0.5
137
0.5
117
0.5
40
–40°C to 125°C
0.5
173
0.5
137
0.5
117
0.5
40
OE input to
A output
–40°C to 85°C
0.5
13
0.5
13
0.5
13
0.5
13
–40°C to 125°C
0.5
13
0.5
13
0.5
13
0.5
13
OE input to
B output
–40°C to 85°C
0.5
211
0.5
107
0.5
63
0.5
24
–40°C to 125°C
0.5
211
0.5
107
0.5
63
0.5
24
Enable time
UNIT
ns
ns
ns
B-PORT SUPPLY VOLTAGE (VCCB)
PARAMETER
tpd
tdis
ten
14
Propagation
delay
TEST
CONDITION
1.5 V ± 0.1 V
1.8 V ± 0.15 V
2.5 V ± 0.2 V
3.3 V ± 0.3 V
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
A input to
B output
–40°C to 85°C
0.5
6
0.5
6
0.5
5
0.5
5
–40°C to 125°C
0.5
6
0.5
6
0.5
5
0.5
5
B input to
A output
–40°C to 85°C
0.5
6
0.5
6
0.5
5
0.5
4
–40°C to 125°C
0.5
6
0.5
6
0.5
5
0.5
4
OE input to
A output
–40°C to 85°C
0.5
28
0.5
28
0.5
28
0.5
28
–40°C to 125°C
0.5
28
0.5
28
0.5
28
0.5
28
OE input to
B output
–40°C to 85°C
0.5
34
0.5
33
0.5
28
0.5
28
–40°C to 125°C
0.5
34
0.5
33
0.5
28
0.5
28
OE input to
A output
–40°C to 85°C
0.5
13
0.5
13
0.5
13
0.5
13
–40°C to 125°C
0.5
13
0.5
13
0.5
13
0.5
13
OE input to
B output
–40°C to 85°C
0.5
16
0.5
14
0.5
10
0.5
9
–40°C to 125°C
0.5
16
0.5
14
0.5
10
0.5
9
Disable time
Enable time
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UNIT
ns
ns
ns
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6.13 Switching Characteristics, VCCA = 3.3 V
See Figure 1 and Figure 2 for test circuit and loading conditions. See Figure 3 and Figure 4 for measurement waveforms.
B-PORT SUPPLY VOLTAGE (VCCB)
PARAMETER
tpd
tdis
ten
Propagation
delay
TEST
CONDITION
0.7 V ± 0.05 V
0.8 V ± 0.04 V
MIN
MAX
MIN
MAX
0.9 V ± 0.045 V
MIN
MAX
MIN
1.2 V ± 0.1 V
MAX
A input to
B output
–40°C to 85°C
0.5
87
0.5
41
0.5
22
0.5
8
–40°C to 125°C
0.5
87
0.5
41
0.5
22
0.5
8
B input to
A output
–40°C to 85°C
0.5
151
0.5
36
0.5
18
0.5
8
–40°C to 125°C
0.5
151
0.5
36
0.5
18
0.5
8
OE input to
A output
–40°C to 85°C
0.5
27
0.5
27
0.5
27
0.5
27
–40°C to 125°C
0.5
27
0.5
27
0.5
27
0.5
27
OE input to
B output
–40°C to 85°C
0.5
172
0.5
136
0.5
116
0.5
39
–40°C to 125°C
0.5
172
0.5
136
0.5
116
0.5
39
OE input to
A output
–40°C to 85°C
0.5
11
0.5
11
0.5
11
0.5
11
–40°C to 125°C
0.5
11
0.5
11
0.5
11
0.5
11
OE input to
B output
–40°C to 85°C
0.5
210
0.5
106
0.5
62
0.5
23
–40°C to 125°C
0.5
210
0.5
106
0.5
62
0.5
23
Disable time
Enable time
UNIT
ns
ns
ns
B-PORT SUPPLY VOLTAGE (VCCB)
PARAMETER
tpd
tdis
ten
Propagation
delay
TEST
CONDITION
1.5 V ± 0.1 V
1.8 V ± 0.15 V
2.5 V ± 0.2 V
3.3 V ± 0.3 V
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
A input to
B output
–40°C to 85°C
0.5
5
0.5
5
0.5
4
0.5
4
–40°C to 125°C
0.5
5
0.5
5
0.5
4
0.5
4
B input to
A output
–40°C to 85°C
0.5
6
0.5
5
0.5
5
0.5
4
–40°C to 125°C
0.5
6
0.5
5
0.5
5
0.5
4
OE input to
A output
–40°C to 85°C
0.5
27
0.5
27
0.5
27
0.5
27
–40°C to 125°C
0.5
27
0.5
27
0.5
27
0.5
27
OE input to
B output
–40°C to 85°C
0.5
33
0.5
32
0.5
27
0.5
27
–40°C to 125°C
0.5
33
0.5
32
0.5
27
0.5
27
OE input to
A output
–40°C to 85°C
0.5
11
0.5
11
0.5
11
0.5
11
–40°C to 125°C
0.5
11
0.5
11
0.5
11
0.5
11
OE input to
B output
–40°C to 85°C
0.5
15
0.5
13
0.5
10
0.5
8
–40°C to 125°C
0.5
15
0.5
13
0.5
10
0.5
8
Disable time
Enable time
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UNIT
ns
ns
ns
15
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SCES876A – AUGUST 2018 – REVISED JANUARY 2019
www.ti.com
6.14 Operating Characteristics: TA = 25°C
PARAMETER
CpdA
CpdA
CpdA
CpdA
16
Power dissipation
capacitance per transceiver
(A to B: outputs enabled)
Power dissipation
capacitance per transceiver
(A to B: outputs disabled)
Power dissipation
capacitance per transceiver
(B to A: outputs enabled)
Power dissipation
capacitance per transceiver
(B to A: outputs disabled)
TEST CONDITIONS
CL = 0, RL = Open
f = 1 MHz, tr = tf = 1 ns
CL = 0, RL = Open
f = 1 MHz, tr = tf = 1 ns
CL = 0, RL = Open
f = 1 MHz, tr = tf = 1 ns
CL = 0, RL = Open
f = 1 MHz, tr = tf = 1 ns
MIN
TYP
VCCA = VCCB = 0.7 V
3.0
VCCA = VCCB = 0.8 V
3.0
VCCA = VCCB = 0.9 V
3.0
VCCA = VCCB = 1.2 V
3.1
VCCA = VCCB = 1.5 V
3.0
VCCA = VCCB = 1.8 V
3.2
VCCA = VCCB = 2.5 V
3.7
VCCA = VCCB = 3.3 V
4.4
VCCA = VCCB = 0.7 V
2.5
VCCA = VCCB = 0.8 V
2.5
VCCA = VCCB = 0.9 V
2.6
VCCA = VCCB = 1.2 V
2.6
VCCA = VCCB = 1.5 V
2.6
VCCA = VCCB = 1.8 V
2.7
VCCA = VCCB = 2.5 V
3.2
VCCA = VCCB = 3.3 V
3.9
VCCA = VCCB = 0.7 V
12.6
VCCA = VCCB = 0.8 V
12.3
VCCA = VCCB = 0.9 V
12.4
VCCA = VCCB = 1.2 V
12.4
VCCA = VCCB = 1.5 V
12.7
VCCA = VCCB = 1.8 V
13.6
VCCA = VCCB = 2.5 V
17.4
VCCA = VCCB = 3.3 V
20.9
VCCA = VCCB = 0.7 V
1.2
VCCA = VCCB = 0.8 V
1.1
VCCA = VCCB = 0.9 V
1.1
VCCA = VCCB = 1.2 V
1.0
VCCA = VCCB = 1.5 V
1.0
VCCA = VCCB = 1.8 V
0.9
VCCA = VCCB = 2.5 V
0.9
VCCA = VCCB = 3.3 V
0.9
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MAX
UNIT
pF
pF
pF
pF
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SN74AXCH8T245
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SCES876A – AUGUST 2018 – REVISED JANUARY 2019
Operating Characteristics: TA = 25°C (continued)
PARAMETER
CpdB
CpdB
CpdB
CpdB
Power dissipation
capacitance per transceiver
(A to B: outputs enabled)
Power dissipation
capacitance per transceiver
(A to B: outputs disabled)
Power dissipation
capacitance per transceiver
(B to A: outputs enabled)
Power dissipation
capacitance per transceiver
(B to A: outputs disabled)
TEST CONDITIONS
CL = 0, RL = Open
f = 1 MHz, tr = tf = 1 ns
CL = 0, RL = Open
f = 1 MHz, tr = tf = 1 ns
CL = 0, RL = Open
f = 1 MHz, tr = tf = 1 ns
CL = 0, RL = Open
f = 1 MHz, tr = tf = 1 ns
MIN
TYP
VCCA = VCCB = 0.7 V
12.6
VCCA = VCCB = 0.8 V
12.4
VCCA = VCCB = 0.9 V
12.4
VCCA = VCCB = 1.2 V
12.4
VCCA = VCCB = 1.5 V
12.6
VCCA = VCCB = 1.8 V
13.6
VCCA = VCCB = 2.5 V
17.2
VCCA = VCCB = 3.3 V
20.8
VCCA = VCCB = 0.7 V
1.4
VCCA = VCCB = 0.8 V
1.3
VCCA = VCCB = 0.9 V
1.3
VCCA = VCCB = 1.2 V
1.2
VCCA = VCCB = 1.5 V
1.1
VCCA = VCCB = 1.8 V
1.1
VCCA = VCCB = 2.5 V
1.1
VCCA = VCCB = 3.3 V
1.0
VCCA = VCCB = 0.7 V
3.3
VCCA = VCCB = 0.8 V
3.3
VCCA = VCCB = 0.9 V
3.3
VCCA = VCCB = 1.2 V
3.2
VCCA = VCCB = 1.5 V
3.2
VCCA = VCCB = 1.8 V
3.3
VCCA = VCCB = 2.5 V
3.6
VCCA = VCCB = 3.3 V
4.4
VCCA = VCCB = 0.7 V
2.8
VCCA = VCCB = 0.8 V
2.8
VCCA = VCCB = 0.9 V
2.8
VCCA = VCCB = 1.2 V
2.8
VCCA = VCCB = 1.5 V
2.7
VCCA = VCCB = 1.8 V
2.8
VCCA = VCCB = 2.5 V
3.1
VCCA = VCCB = 3.3 V
3.9
MAX
UNIT
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pF
pF
pF
pF
17
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SCES876A – AUGUST 2018 – REVISED JANUARY 2019
www.ti.com
7 Parameter Measurement Information
Unless otherwise noted, all input pulses are supplied by generators having the following characteristics:
• f =1 MHz
• Z0 = 50 Ω
• dv / dt ≤ 1 ns/V
Measurement Point
2 X VCCO
S1
RL
Open
Output Pin
Under Test
GND
CL(1)
(1)
RL
CL includes probe and jig capacitance.
Figure 1. Load Circuit
VCCO
CL
S1
VTP
2k
15 pF
Open
N/A
0.65 V - 0.95 V 20 k
15 pF
Open
N/A
Parameter
1.1 V - 3.6 V
tpd
ten(1), tdis(1)
3 V - 3.6 V
2k
15 pF
2 X VCCO
0.3 V
1.65 V - 2.7 V
2k
15 pF
2 X VCCO
0.15 V
1.1 V - 1.6 V
2k
15 pF
2 X VCCO
0.1 V
0.65 V - 0.95 V 20 k
15 pF
2 X VCCO
0.1 V
2k
15 pF
GND
0.3 V
1.65V - 2.7 V
2k
15 pF
GND
0.15 V
1.1 V - 1.6 V
2k
15 pF
GND
0.1 V
0.65 V - 0.95 V 20 k
15 pF
GND
0.1 V
3 V - 3.6 V
ten(2), tdis(2)
RL
(1)
Output waveform on the conditions that input is driven to a valid Logic Low.
(2)
Output waveform on the condition that input is driven to a valid Logic High.
Figure 2. Load Circuit Conditions
VCCI(1)
An, Bn Input
VCCI / 2
VCCI / 2
GND
tpd
tpd
VOH(2)
Bn, An Output
VCCO / 2
VCCO / 2
VOL(2)
(1)
VCCI is the supply pin associated with the input port.
(2)
VOH and VOL are typical output voltage levels with specified RL, CL, and S1.
Figure 3. Propagation Delay
18
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Parameter Measurement Information (continued)
VCCA
OE
VCCA / 2
VCCA / 2
GND
tdis
ten
VCCO(3)
Output(1)
VCCO / 2
VOL + VTP
VOL(4)
VOH(4)
VOH - VTP
Output(2)
VCCO / 2
GND
(1)
Output waveform on the condition that input is driven to a valid Logic Low.
(2)
Output waveform on the condition that input is driven to a valid Logic High.
(3)
VCCO is the supply pin associated with the output port.
(4)
VOH and VOL are typical output voltage levels with specified RL, CL, and S1.
Figure 4. Enable Time And Disable Time
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8 Detailed Description
8.1 Overview
The SN74AXCH8T245 device is an 8-bit, dual-supply non-inverting transceiver with bidirectional voltage level
translation. The I/O pins labeled with A and the control pins (DIR1, DIR2, and OE) are supported by VCCA, and
the I/O pins labeled with B are supported by VCCB. Both the A port and the B port are able to accept I/O voltages
ranging from 0.65 V to 3.6 V.
8.2 Functional Block Diagram
OE
DIR1
Control Block To Enable or
Disable Outputs (Note: Inputs
on each buffer are always
enabled)
VCCA
VCCB
DIR2
GND
A1
B1
A2
B2
A3
B3
A4
B4
A5
B5
A6
B6
A7
B7
A8
B8
Figure 5. Functional Block Diagram
20
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8.3 Feature Description
8.3.1 Up-Translation and Down-Translation From 0.65 V to 3.6 V
Both supply pins are configurable over the full 0.65 V to 3.6 V voltage range, which makes the device suitable for
translating between any of the low voltage nodes (0.7 V, 0.8 V, 0.9 V, 1.2 V, 1.8 V, 2.5 V, and 3.3 V).
8.3.2 Multiple Direction Control Pins
Two control pins are used to configure the 8 data I/Os. I/O channels 1 through 4 are grouped together and I/O
channels 5 through 8 are banked together. The benefit of this is to permit simultaneous up-translation and downtranslation within one device. This eliminates the need for multiple devices, where each device can only provide
up-translation or down-translation sequentially. Simultaneous up and down translation is supported when both
VCCA and VCCB are at least 1.40 V.
8.3.3 Bus-Hold Circuitry
Active bus-hold circuitry holds unused or undriven data inputs at a valid logic state, which helps with board space
savings and reduced component costs. Use of pull-up or pull-down resistors with the bus-hold circuitry is not
recommended. See the Bus-Hold Circuit application note for more details. (SCLA015).
Note that the bus-hold circuitry always remains active when the corresponding supply is present (i.e. B port bushold circuits are active when VCCB is present, and A port bus-hold circuits are active when VCCA is present). The
bus hold circuitry is also active even when the device is in a partial power down state or when the output enable
pin is used to place all outputs into high impedance.
8.3.4 Ioff Supports Partial-Power-Down Mode Operation
This feature is to limit the leakage current of an I/O pin being driven to a voltage as large as 3.6 V while having
its corresponding power supply rail powered down. This is represented by the Ioff parameter in the Electrical
Characteristics table.
8.4 Device Functional Modes
All control inputs are referenced to VCCA and must be driven to a valid Logic High or Logic Low (that is, not
floating) to assure proper device operation and to prevent excessive power consumption. Table 1 summarizes
the possible modes of device operation based on the configuration of the control inputs.
Table 1. Function Table (1)
CONTROL INPUTS
(1)
Signal Direction
OE
DIR1
DIR2
H
X
X
L
L
L
L
L
H
L
H
L
L
H
H
Bits 1:4
Bits 5:8
Disabled (Hi-Z)
B to A
B to A
A to B
A to B
A to B
B to A
Input circuits of the data I/Os are always active and must be driven to a valid logic level.
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9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The SN74AXCH8T245 device can be used in level-translation applications for interfacing devices or systems
operating at different voltage nodes. Figure 6 depicts an application in which the SN74AXCH8T245 device is uptranslating a 0.7 V input to a 3.3 V output to interface between a system controller and a peripheral device.
9.2 Typical Application
0.7 V
3.3 V
0.1 µF
0.1 µF
10
NŸ
10
NŸ
VCCA
VCCB
OE
DIR1
10
NŸ
DIR2
GND
Controller
SN74AXCH8T245
Peripheral
A1
B1
A2
B2
A3
B3
A4
B4
A5
B5
A6
B6
A7
B7
A8
B8
Figure 6. Typical Application Schematic
22
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Typical Application (continued)
9.2.1 Design Requirements
For this design example, use the parameters listed in Table 2.
Table 2. Design Parameters
DESIGN PARAMETERS
EXAMPLE VALUE
Input voltage range
0.65 V to 3.6 V
Output voltage range
0.65 V to 3.6 V
9.2.2 Detailed Design Procedure
To begin the design process, determine the following:
• Input voltage range
– Use the supply voltage of the device that is driving the SN74AXCH8T245 device to determine the input
voltage range. For a valid logic high the value must exceed the VIH of the input port. For a valid logic low
the value must be less than the VIL of the input port.
• Output voltage range
– Use the supply voltage of the device that the SN74AXCH8T245 device is driving to determine the output
voltage range.
9.2.3 Application Curve
Figure 7. Translation Up (0.7 V to 3.3 V) at 2.5 MHz
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10 Power Supply Recommendations
Always apply a ground reference to the GND pins first. However, there are no additional requirements for power
supply sequencing.
This device was designed with various power supply sequencing methods in mind to help prevent unintended
triggering of downstream devices. For more information regarding the power up glitch performance of the AXC
family of level translators, see the Power Sequencing for AXC Family of Devices application report.
11 Layout
11.1 Layout Guidelines
To
•
•
•
assure reliability of the device, follow common printed-circuit board layout guidelines.
Use bypass capacitors on power supplies.
Use short trace lengths to avoid excessive loading.
Place pads on the signal paths for loading capacitors or pullup resistors to help adjust rise and fall times of
signals depending on the system requirements.
11.2 Layout Example
LEGEND
Polygonal Copper Pour
VIA to Power Plane (Inner Layer)
VIA to GND Plane (Inner Layer)
Bypass Capacitor
Bypass
Capacitor
VCCA
1
VCCA
VCCB
24
2
DIR1
VCCB
23
From Source
3
A1
OE
22
From Source
4
A2
B1
21
To Destination
From Source
5
A3
B2
20
To Destination
From Source
6
A4
B3
19
To Destination
SN74AXCH8T245
(PW Package)
From Source
7
A5
B4
18
To Destination
From Source
8
A6
B5
17
To Destination
From Source
9
A7
B6
16
To Destination
From Source
10
A8
B7
15
To Destination
11
DIR2
B8
14
To Destination
12
GND
GND
13
Figure 8. SN74AXCH8T245 Device Layout Example
24
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SCES876A – AUGUST 2018 – REVISED JANUARY 2019
12 Device and Documentation Support
12.1 Documentation Support
12.1.1 Related Documentation
For related documentation see the following:
Texas Instruments, Implications of Slow or Floating CMOS Inputs application report
Texas Instruments, Power Sequencing for AXC Family of Devices application report
12.2 Receiving Notification of Documentation Updates
To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper
right corner, click on Alert me to register and receive a weekly digest of any product information that has
changed. For change details, review the revision history included in any revised document.
12.3 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
12.4 Trademarks
E2E is a trademark of Texas Instruments.
12.5 Electrostatic Discharge Caution
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
12.6 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
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13 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
26
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PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
SN74AXCH8T245PWR
ACTIVE
TSSOP
PW
24
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
AH8T245
SN74AXCH8T245RHLR
ACTIVE
VQFN
RHL
24
3000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
AH8T245
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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