SN74AUC245
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
www.ti.com
SCES419A – JANUARY 2003 – REVISED MARCH 2005
FEATURES
•
VCC
1
20
3
4
19 OE
18 B1
17 B2
5
6
16 B3
15 B4
7
14 B5
13 B6
2
8
12 B7
9
10
11
B8
•
•
•
•
•
A1
A2
A3
A4
A5
A6
A7
A8
DIR
•
RGY PACKAGE
(TOP VIEW)
Optimized for 1.8-V Operation and Is 3.6-V I/O
Tolerant to Support Mixed-Mode Signal
Operation
Ioff Supports Partial-Power-Down Mode
Operation
Sub-1-V Operable
Max tpd of 1.7 ns at 1.8 V
Low Power Consumption, 20-µA Max ICC
±8-mA Output Drive at 1.8 V
Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
– 1000-V Charged-Device Model (C101)
GND
•
DESCRIPTION/ORDERING INFORMATION
This octal bus transceiver is operational at 0.8-V to 2.7-V VCC, but is designed specifically for 1.65-V to 1.95-V
VCC operation.
The SN74AUC245 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 at the direction-control
(DIR) input. The output-enable (OE) input can be used to disable the device so the buses are effectively isolated.
To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
ORDERING INFORMATION
PACKAGE (1)
TA
–40°C to 85°C
(1)
ORDERABLE PART NUMBER
TOP-SIDE MARKING
QFN – RGY
Tape and reel
SN74AUC245RGYR
MS245
VFBGA – GQN
Tape and reel
SN74AUC245GQNR
MS245
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2003–2005, Texas Instruments Incorporated
SN74AUC245
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
www.ti.com
SCES419A – JANUARY 2003 – REVISED MARCH 2005
GQN PACKAGE
(TOP VIEW)
1
2
3
4
A
B
C
D
E
TERMINAL ASSIGNMENTS
1
2
3
4
A
A1
DIR
VCC
OE
B
A3
B2
A2
B1
C
A5
A4
B4
B3
D
A7
B6
A6
B5
E
GND
A8
B8
B7
FUNCTION TABLE
INPUTS
OE
DIR
OPERATION
L
L
B data to A bus
L
H
A data to B bus
H
X
Isolation
LOGIC DIAGRAM (POSITIVE LOGIC)
DIR
1
19
A1
2
18
To Seven Other Channels
Pin numbers shown are for the RGY package.
2
OE
B1
SN74AUC245
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
www.ti.com
Absolute Maximum Ratings
SCES419A – JANUARY 2003 – REVISED MARCH 2005
(1)
over operating free-air temperature range (unless otherwise noted)
MIN
MAX
VCC
Supply voltage range
–0.5
3.6
V
VI
Input voltage range (2)
–0.5
3.6
V
–0.5
3.6
V
–0.5
VCC + 0.5
state (2)
UNIT
VO
Voltage range applied to any output in the high-impedance or power-off
VO
Output voltage range (2)
IIK
Input clamp current
VI < 0
–50
mA
IOK
Output clamp current
VO < 0
–50
mA
IO
Continuous output current
±20
mA
±100
mA
Continuous current through VCC or GND
θJA
Package thermal impedance
Tstg
Storage temperature range
(1)
(2)
(3)
(4)
package (3)
78
RGY package (4)
37
GQN
–65
V
°C/W
°C
150
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating
conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
The input negative-voltage and output voltage ratings may be exceeded if the input and output current ratings are observed.
The package thermal impedance is calculated in accordance with JESD 51-7.
The package thermal impedance is calculated in accordance with JESD 51-5.
Recommended Operating Conditions (1)
VCC
Supply voltage
VIH
High-level input voltage
VCC = 0.8 V
MIN
MAX
0.8
2.7
VCC
3.6
0.65 × VCC
3.6
1.7
3.6
VCC = 1.1 V to 1.95 V
0
0.35 × VCC
VCC = 2.3 V to 2.7 V
0
0.7
Active state
0
VCC
3-state
0
3.6
VCC = 1.1 V to 1.95 V
VCC = 2.3 V to 2.7 V
VCC = 0.8 V
VIL
Low-level input voltage
VO
Output voltage
IOH
High-level output current
IOL
Low-level output current
Input transition rise or fall rate
TA
Operating free-air temperature
(1)
V
V
0
VCC = 0.8 V
–0.7
VCC = 1.1 V
–3
VCC = 1.4 V
–5
VCC = 1.65 V
–8
VCC = 2.3 V
–9
VCC = 0.8 V
0.7
VCC = 1.1 V
3
VCC = 1.4 V
5
VCC = 1.65 V
8
VCC = 2.3 V
∆t/∆v
UNIT
V
V
mA
mA
9
–40
20
ns/V
85
°C
All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
3
SN74AUC245
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
www.ti.com
SCES419A – JANUARY 2003 – REVISED MARCH 2005
Electrical Characteristics
over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
VOH
VOL
MIN TYP (1) MAX
VCC
IOH = –100 µA
0.8 V to 2.7 V
IOH = –0.7 mA
0.8 V
IOH = –3 mA
1.1 V
0.8
IOH = –5 mA
1.4 V
1
IOH = –8 mA
1.65 V
1.2
IOH = –9 mA
2.3 V
1.8
IOL = 100 µA
0.8 V to 2.7 V
IOL = 0.7 mA
0.8 V
IOL = 3 mA
1.1 V
0.3
IOL = 5 mA
1.4 V
0.4
IOL = 8 mA
1.65 V
0.45
IOL = 9 mA
2.3 V
0.6
UNIT
VCC – 0.1
0.55
V
0.2
0.25
V
VI = VCC or GND
0 to 2.7 V
±5
µA
Ioff
VI or VO = 2.7 V
0
±10
µA
IOZ (2)
VO = VCC or GND
2.7 V
±10
µA
ICC
VI = VCC or GND,
20
µA
Ci
VI = VCC or GND
2.5 V
2.5
3
pF
Cio
VO = VCC or GND
2.5 V
7.5
8
pF
II
(1)
(2)
All inputs
IO = 0
0.8 V to 2.7 V
All typical values are at TA = 25°C.
For I/O ports, the parameter IOZ includes the input leakage current.
Switching Characteristics
over recommended operating free-air temperature range, CL = 15 pF (unless otherwise noted) (see Figure 1)
FROM
(INPUT)
TO
(OUTPUT)
VCC = 0.8 V
tpd
A or B
B or A
ten
OE
tdis
OE
PARAMETER
TYP
VCC = 1.2 V
± 0.1 V
VCC = 1.5 V
± 0.1 V
VCC = 1.8 V
± 0.15 V
VCC = 2.5 V
± 0.2 V
UNIT
MIN
MAX
MIN
MAX
MIN
TYP
MAX
MIN
MAX
5
1
3.2
0.6
2
0.5
1
1.7
0.4
1.4
ns
A or B
9
1.2
4.9
1
3
0.8
1.2
2.4
0.6
1.8
ns
A or B
9.5
1.9
5.7
1.2
4
0.9
1.9
4.1
0.6
2.9
ns
Switching Characteristics
over recommended operating free-air temperature range, CL = 30 pF (unless otherwise noted) (see Figure 1)
FROM
(INPUT)
TO
(OUTPUT)
tpd
A or B
ten
tdis
PARAMETER
4
VCC = 1.8 V
± 0.15 V
VCC = 2.5 V
± 0.2 V
UNIT
MIN
TYP
MAX
MIN
MAX
B or A
0.6
1.3
2.2
0.5
1.8
ns
OE
A or B
1.1
1.5
3
1.1
2.4
ns
OE
A or B
1.6
2.2
4
0.8
2.6
ns
SN74AUC245
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
www.ti.com
SCES419A – JANUARY 2003 – REVISED MARCH 2005
Operating Characteristics
TA = 25°C
PARAMETER
Cpd
Power
dissipation
capacitance
Outputs
enabled
Outputs
disabled
TEST
CONDITIONS
VCC = 0.8 V
VCC = 1.2 V
VCC = 1.5 V
VCC = 1.8 V
VCC = 2.5 V
TYP
TYP
TYP
TYP
TYP
20
21
21
23
27
1
1
1
1
1
f = 10 MHz
UNIT
pF
5
SN74AUC245
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
www.ti.com
SCES419A – JANUARY 2003 – REVISED MARCH 2005
PARAMETER MEASUREMENT INFORMATION
2 × VCC
S1
RL
From Output
Under Test
Open
GND
CL
(see Note A)
TEST
S1
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
Open
2 × VCC
GND
RL
LOAD CIRCUIT
VCC
CL
RL
V∆
0.8 V
1.2 V ± 0.1 V
1.5 V ± 0.1 V
1.8 V ± 0.15 V
2.5 V ± 0.2 V
1.8 V ± 0.15 V
2.5 V ± 0.2 V
15 pF
15 pF
15 pF
15 pF
15 pF
30 pF
30 pF
2 kΩ
2 kΩ
2 kΩ
2 kΩ
2 kΩ
1 kΩ
500 Ω
0.1 V
0.1 V
0.1 V
0.15 V
0.15 V
0.15 V
0.15 V
VCC
Timing Input
VCC/2
0V
tw
tsu
th
VCC
VCC/2
Input
VCC/2
VCC
VCC/2
VCC/2
Data Input
0V
0V
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
VOLTAGE WAVEFORMS
PULSE DURATION
VCC
VCC/2
Input
VCC/2
0V
tPHL
tPLH
VOH
VCC/2
Output
VCC/2
VOL
tPHL
VCC/2
VOL
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
INVERTING AND NONINVERTING OUTPUTS
VCC/2
VCC/2
0V
tPZL
tPLZ
VCC
VCC/2
tPZH
VOH
Output
Output
Waveform 1
S1 at 2 × VCC
(see Note B)
tPLH
VCC/2
VCC
Output
Control
Output
Waveform 2
S1 at GND
(see Note B)
VOL + V∆
VOL
tPHZ
VCC/2
VOH - V∆
VOH
≈0 V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
LOW- AND HIGH-LEVEL ENABLING
NOTES: A. CL includes probe and jig capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low, except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high, except when disabled by the output control.
C. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, ZO = 50 Ω, slew rate ≥ 1 V/ns.
D. The outputs are measured one at a time, with one transition per measurement.
E. tPLZ and tPHZ are the same as tdis.
F. tPZL and tPZH are the same as ten.
G. tPLH and tPHL are the same as tpd.
H. All parameters and waveforms are not applicable to all devices.
Figure 1. Load Circuit and Voltage Waveforms
6
PACKAGE OPTION ADDENDUM
www.ti.com
20-Jan-2021
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)
SN74AUC245RGYR
ACTIVE
VQFN
RGY
20
3000
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 85
MS245
(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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