SGM8T245
8-Bit Dual-Supply Bus Transceiver
with Configurable Voltage
Translation and 3-State Outputs
GENERAL DESCRIPTION
FEATURES
This 8-bit non-inverting bus transceiver uses two
● Control Inputs VIH/VIL Levels are Referenced to
separate configurable power-supply rails. The SGM8T245
is optimized to operate with VCCA/VCCB set at 1.2V to
5.0V. The A port is designed to track VCCA. VCCA
VCCA Voltage
● VCC Isolation: If Either VCC Input is at GND,
All I/O Ports are in the High-Impedance State
accepts any supply voltage from 1.2V to 5.0V. The B
● IOFF: Supports Partial Power-Down Mode Operation
port is designed to track VCCB. VCCB accepts any supply
● Fully Configurable Dual-Rail Design Allows Each
voltage from 1.2V to 5.0V. This allows for universal
Port to Operate Over the Full 1.2V to 5.0V
low-voltage bidirectional translation between any of the
Power-Supply Range
1.2V, 1.5V, 1.8V, 2.5V, 3.3V and 5.0V voltage nodes.
The
SGM8T245
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 )
● I/Os are 6.0V Tolerant
● -40℃ to +125℃ Operating Temperature Range
● Available in Green TSSOP-24 and TQFN-5.5×3.5-24L
Packages
APPLICATIONS
input can be used to disable the outputs so the buses
Personal Electronic
are effectively isolated.
Industrial
The SGM8T245 solution is compatible with a singlesupply system and can be replaced later with the
SGM7SZ245 function, with minimal printed circuit
board redesign.
Enterprise
Telecom
LOGIC DIAGRAM
This device is fully specified for partial-power-down
applications using IOFF. The IOFF circuitry disables the
outputs, thus preventing damaging current backflow
DIR
2
22
through the device when it is powered down.
To ensure the high-impedance state during power up or
A1
OE
3
power down, OE shall be tied to VCC through a pull-up
21
resistor; the minimum value of the resistor is
B1
determined by the current-sinking capability of the
driver.
A8
10
The SGM8T245 is available in Green TSSOP-24 and
14
TQFN-5.5×3.5-24L packages. It operates over an
ambient temperature range of -40℃ to +125℃.
SG Micro Corp
www.sg-micro.com
B8
NOTE: Positive logic.
DECEMBER 2017 – REV. A
8-Bit Dual-Supply Bus Transceiver with
Configurable Voltage Translation and 3-State Outputs
SGM8T245
PACKAGE/ORDERING INFORMATION
MODEL
PACKAGE
DESCRIPTION
SPECIFIED
TEMPERATURE
RANGE
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
TSSOP-24
-40℃ to +125℃
SGM8T245XTS24G/TR
SGM8T245
XTS24
XXXXX
Tape and Reel, 4000
TQFN-5.5×3.5-24L
-40℃ to +125℃
SGM8T245XTQQ24G/TR
SGM8T245
XTQQ
XXXXX
Tape and Reel, 3000
SGM8T245
NOTE: XXXXX = Date Code and Vendor Code.
Green (RoHS & HSF): SG Micro Corp defines "Green" to mean Pb-Free (RoHS compatible) and free of halogen substances. If
you have additional comments or questions, please contact your SGMICRO representative directly.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage Range
VCCA ................................................................ -0.3V to 6.0V
VCCB ................................................................ -0.3V to 6.0V
Input Voltage Range, VI (1)
A Ports ............................................................ -0.3V to 6.0V
B Ports ............................................................ -0.3V to 6.0V
Control Inputs .................................................. -0.3V to 6.0V
Voltage Range Applied to Any Output in the High- Impedance
(1)
or Power-Off State, VO
A Ports ............................................................ -0.3V to 6.0V
B Ports ............................................................ -0.3V to 6.0V
Voltage Range Applied to Any Output in the High or Low
(1) (2)
State, VO
A Ports ................................................. -0.3V to VCCA + 0.3V
B Ports ................................................. -0.3V to VCCB + 0.3V
Input Clamp Current, IIK (VI < 0) ........................-70mA (MAX)
Output Clamp Current, IOK (VO < 0)...................-70mA (MAX)
Continuous Output Current, IO ...................... -70mA to 70mA
Continuous Output Current through VCCA, VCCB, or GND, IO
.................................................................. -100mA to 100mA
Junction Temperature .................................................+150℃
Storage Temperature Range ........................ -65℃ to +150℃
Lead Temperature (Soldering, 10s) ............................+260℃
ESD Susceptibility
HBM ............................................................................. 6000V
MM ................................................................................. 400V
CDM ............................................................................ 1000V
OVERSTRESS CAUTION
Stresses beyond those listed may cause permanent damage
to the device. Functional operation of the device at these or
any other conditions beyond those indicated in the operational
section of the specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
reliability.
ESD SENSITIVITY CAUTION
This integrated circuit can be damaged by ESD if you don’t
pay attention to ESD protection. SGMICRO 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.
DISCLAIMER
SG Micro Corp reserves the right to make any change in
circuit design, specification or other related things if necessary
without notice at any time.
NOTES:
1. The input voltage and output negative-voltage ratings may
be exceeded if the input and output current ratings are
observed.
2. The output positive-voltage rating may be exceeded up to
6.0V maximum if the output current rating is observed.
SG Micro Corp
www.sg-micro.com
DECEMBER 2017
2
SGM8T245
8-Bit Dual-Supply Bus Transceiver with
Configurable Voltage Translation and 3-State Outputs
RECOMMENDED OPERATING CONDITIONS (1) (2) (3)
Supply Voltage Range
VCCA ..................................................................1.2V to 5.0V
VCCB ..................................................................1.2V to 5.0V
VIH, High-Level Input Voltage (Data Inputs)
(VCCI = 1.2V to 1.4V) ................................. 0.85 × VCCI (MIN)
(VCCI = 1.4V to 2.3V) ................................. 0.75 × VCCI (MIN)
(VCCI = 2.3V to 3.3V) ......................................... 1.75V (MIN)
(VCCI = 3.3V to 5.0V) ........................................... 2.2V (MIN)
VIL, Low-Level Input Voltage (Data Inputs)
(VCCI = 1.2V to 1.4V) ..................................0.1 × VCCI (MAX)
(VCCI = 1.4V to 2.3V) ................................0.15 × VCCI (MAX)
(VCCI = 2.3V to 3.3V) .......................................... 0.5V (MAX)
(VCCI = 3.3V to 5.0V) ........................................ 0.65V (MAX)
VIH, High-Level Input Voltage (Control Inputs, referenced to
VCCA)
(VCCI = 1.2V to 1.4V) ................................ 0.85 × VCCA (MIN)
(VCCI = 1.4V to 2.3V) ................................ 0.75 × VCCA (MIN)
(VCCI = 2.3V to 3.3V) ......................................... 1.75V (MIN)
(VCCI = 3.3V to 5.0V) ........................................... 2.2V (MIN)
SG Micro Corp
www.sg-micro.com
VIL, Low-Level Input Voltage (Control Inputs, referenced to
VCCA)
(VCCI = 1.2V to 1.4V) ................................. 0.1 × VCCA (MAX)
(VCCI = 1.4V to 2.3V) ............................... 0.15 × VCCA (MAX)
(VCCI = 2.3V to 3.3V) .......................................... 0.5V (MAX)
(VCCI = 3.3V to 5.0V) ........................................ 0.65V (MAX)
VI, Input Voltage Range......................................... 0V to 5.0V
VO, Output Voltage Range
Active State ......................................................... 0V to VCCO
3-State ................................................................. 0V to 5.0V
Input Transition Rise or Fall Rate, Δt/ΔV ........... 3ns/V (MAX)
Operating Temperature Range..................... -40℃ to +125℃
NOTES:
1. VCCI is the VCC associated with the input ports.
2. VCCO is the VCC associated with the output ports.
3. All unused data inputs of the device must be held at VCCI or
GND to ensure proper device operation.
DECEMBER 2017
3
8-Bit Dual-Supply Bus Transceiver with
Configurable Voltage Translation and 3-State Outputs
SGM8T245
PIN CONFIGURATIONS
(TOP VIEW)
(TOP VIEW)
VCCA
1
24
VCCB
DIR
2
23
VCCB
VCCA
VCCB
1
24
DIR
2
23
VCCB
A1
3
22
OE
A2
4
21
B1
20
B2
19
B3
18
B4
A1
3
22
OE
A2
4
21
B1
A3
5
20
B2
A3
5
A4
6
19
B3
A4
6
A5
7
18
B4
A5
7
A6
8
17
B5
A6
8
17
B5
A7
9
16
B6
A8
10
15
B7
GND
11
14
B8
A7
9
16
B6
A8
10
15
B7
GND
11
14
B8
GND
12
13
GND
TSSOP-24
GND
12
13
GND
GND
TQFN-5.5×3.5-24L
PIN DESCRIPTION
TSSOP-24
1
2
3
4
5
6
7
8
9
10
11, 12, 13
14
15
16
17
18
19
20
21
PIN
TQFN-5.5×3.5-24L
1
2
3
4
5
6
7
8
9
10
11, 12, 13
14
15
16
17
18
19
20
21
22
NAME
I/O
VCCA
DIR
A1
A2
A3
A4
A5
A6
A7
A8
GND
B8
B7
B6
B5
B4
B3
B2
B1
–
I
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
–
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
22
OE
I
23, 24
23, 24
VCCB
–
–
Exposed Pad
GND
–
SG Micro Corp
www.sg-micro.com
FUNCTION
A Ports Supply Voltage. 1.2V ≤ VCCA ≤ 5.0V.
Direction-Control Signal.
Input/Output A1. Referenced to VCCA.
Input/Output A2. Referenced to VCCA.
Input/Output A3. Referenced to VCCA.
Input/Output A4. Referenced to VCCA.
Input/Output A5. Referenced to VCCA.
Input/Output A6. Referenced to VCCA.
Input/Output A7. Referenced to VCCA.
Input/Output A8. Referenced to VCCA.
Ground.
Input/Output B8. Referenced to VCCB.
Input/Output B7. Referenced to VCCB.
Input/Output B6. Referenced to VCCB.
Input/Output B5. Referenced to VCCB.
Input/Output B4. Referenced to VCCB.
Input/Output B3. Referenced to VCCB.
Input/Output B2. Referenced to VCCB.
Input/Output B1. Referenced to VCCB.
3-State Output-Mode Enable. Pull OE high to place all
outputs in 3-state mode. Referenced to VCCA.
B Ports Supply Voltage. 1.2V ≤ VCCB ≤ 5.0V.
Exposed Pad is Internally Connected to GND. Connect it to a
large ground plane to maximize thermal performance; not
intended as an electrical connection point.
DECEMBER 2017
4
8-Bit Dual-Supply Bus Transceiver with
Configurable Voltage Translation and 3-State Outputs
SGM8T245
ELECTRICAL CHARACTERISTICS (1) (2)
(Full = -40℃ to +125℃, typical values are at TA = +25℃, unless otherwise noted.)
PARAMETER
High-Level Output
Voltage
Low-Level Output
Voltage
SYMBOL
VOH
VOL
Input Leakage Control
Current
Inputs
Power Off
Leakage
Current
A or B
Ports
3-State
Output
Leakage
A or B
Ports
Quiescent Supply
Current
Input
Capacitance
Input/Output
Capacitance
Control
Inputs
A or B
Ports
VI = VIH
VI = VIL
IOFF
(3)
ICCA
ICCB
ICCA + ICCB
TEMP
MIN
TYP
VCCA = 1.2V to 5.0V, VCCB = 1.2V to 5.0V,
IOH = -100μA
+25℃
VCCO - 0.005
VCCA = 1.2V, VCCB = 1.2V, IOH = -1mA
+25℃
1.17
VCCA = 1.4V, VCCB = 1.4V, IOH = -5mA
+25℃
1.27
VCCA = 1.65V, VCCB = 1.65V, IOH = -16mA
Full
1.10
VCCA = 2.3V, VCCB = 2.3V, IOH = -20mA
Full
1.90
2
VCCA = 5.0V, VCCB = 5.0V, IOH = -20mA
Full
4.70
4.83
MAX
V
+25℃
0.005
VCCA = 1.2V, VCCB = 1.2V, IOL = 1mA
+25℃
0.02
VCCA = 1.4V, VCCB = 1.4V, IOL = 5mA
+25℃
0.09
VCCA = 1.65V, VCCB = 1.65V, IOL = 16mA
Full
0.25
0.40
VCCA = 2.3V, VCCB = 2.3V, IOL = 20mA
Full
0.2
0.36
VCCA = 5.0V, VCCB = 5.0V, IOL = 20mA
Full
0.18
0.27
Full
±0.01
11
VCCA = 0V, VCCB = 0V to 5.0V
Full
±0.01
14
VCCA = 0V to 5.0V, VCCB = 0V
Full
±0.01
14
Full
±0.01
11
VI or VO = 0V to 5.0V
VCCA = 5.0V, VCCB = 5.0V,
VO = VCCO or GND, VI = VCCI or GND, OE = VIH
VCCA = 1.2V to 5.0V, VCCB = 1.2V to 5.0V,
VI = VCCI or GND, IO = 0
UNITS
1.32
VCCA = 1.2V to 5.0V, VCCB = 1.2V to 5.0V,
IOL = 100μA
VCCA = 1.2V to 5.0V, VCCB = 1.2V to 5.0V,
VI = VCCA or GND
II
IOZ
CONDITIONS
V
Full
15
Full
24
Full
25
μA
μA
μA
μA
CI
VCCA = 3.3V, VCCB = 3.3V, VI = 3.3V or GND
+25℃
12.3
pF
CIO
VCCA = 3.3V, VCCB = 3.3V, VO = 3.3V or GND
+25℃
9.8
pF
NOTES:
1. VCCO is the VCC associated with the output ports.
2. VCCI is the VCC associated with the input ports.
3. For I/O ports, the parameter IOZ includes the input leakage current.
SG Micro Corp
www.sg-micro.com
DECEMBER 2017
5
8-Bit Dual-Supply Bus Transceiver with
Configurable Voltage Translation and 3-State Outputs
SGM8T245
SWITCHING CHARACTERISTICS
(VCCA = 1.2V, unless otherwise noted.)
PARAMETER
tPLH
tPHL
tPLH
tPHL
tPZH
tPZL
tPZH
tPZL
tPHZ
tPLZ
tPHZ
tPLZ
FROM
(INPUT)
TO
(OUTPUT)
A
B
B
A
OE
A
OE
B
OE
A
OE
B
VCCB = 1.2V
VCCB = 1.5V
VCCB =1.8V
VCCB = 2.5V
VCCB = 3.3V
VCCB = 5.0V
TYP
TYP
TYP
TYP
TYP
TYP
62.1
42.9
36.8
31.9
30.9
31.1
143.9
97.7
86.2
77.9
75.3
80.2
50.8
45.8
43.5
41.0
40.2
39.2
132.7
87.8
77.2
71.9
70.2
70.9
167.5
150.1
146.1
144.1
144.2
146.6
123.5
123.5
123.5
123.5
123.5
124.6
159.3
141.3
134.5
130.5
129.7
131.7
132.7
120.3
115.6
110.4
110.9
113.7
55.6
55.6
55.6
55.6
55.6
56.0
56.4
56.4
56.4
56.4
56.4
56.9
68.2
63.0
63.8
61.9
70.3
72.8
66.0
60.6
59.9
58.7
61.7
64.8
UNITS
ns
ns
ns
ns
ns
ns
SWITCHING CHARACTERISTICS (continued)
(VCCA = 1.5V, unless otherwise noted.)
PARAMETER
tPLH
tPHL
tPLH
tPHL
tPZH
tPZL
tPZH
tPZL
tPHZ
tPLZ
tPHZ
tPLZ
FROM
(INPUT)
TO
(OUTPUT)
A
B
B
A
OE
A
OE
B
OE
A
OE
B
SG Micro Corp
www.sg-micro.com
VCCB = 1.2V
VCCB = 1.5V
VCCB =1.8V
VCCB = 2.5V
VCCB = 3.3V
VCCB = 5.0V
TYP
TYP
TYP
TYP
TYP
TYP
46.2
28.0
21.5
16.6
14.6
13.5
98.3
54.4
41.9
33.0
29.8
28.0
31.6
26.3
24.0
21.3
17.6
19.5
97.3
52.4
42.6
36.7
34.8
34.4
83.6
66.2
62.6
60.0
59.5
59.5
50.7
50.7
50.7
50.7
50.7
50.7
82.3
63.5
57.1
52.2
50.4
49.2
66.6
54.1
49.3
45.2
43.8
43.4
27.8
27.8
27.8
27.8
27.8
27.8
26.3
26.3
26.3
26.3
26.3
26.3
38.6
33.1
32.9
31.4
38.3
36.1
35.6
30.3
30.5
27.2
30.0
27.6
UNITS
ns
ns
ns
ns
ns
ns
DECEMBER 2017
6
8-Bit Dual-Supply Bus Transceiver with
Configurable Voltage Translation and 3-State Outputs
SGM8T245
SWITCHING CHARACTERISTICS (continued)
(VCCA = 1.8V, unless otherwise noted.)
PARAMETER
tPLH
tPHL
tPLH
tPHL
tPZH
tPZL
tPZH
tPZL
tPHZ
tPLZ
tPHZ
tPLZ
FROM
(INPUT)
TO
(OUTPUT)
A
B
B
A
OE
A
OE
B
OE
A
OE
B
VCCB = 1.2V
VCCB = 1.5V
VCCB =1.8V
VCCB = 2.5V
VCCB = 3.3V
VCCB = 5.0V
TYP
TYP
TYP
TYP
TYP
TYP
42.6
24.4
18.0
12.7
10.8
9.3
88.3
45.5
32.1
20.8
20.2
18.2
25.0
19.4
17.2
14.8
13.8
12.9
86.3
40.8
31.5
25.6
23.6
22.9
61.7
44.0
40.3
37.8
37.4
37.3
31.5
31.5
31.5
31.5
31.5
31.5
64.5
45.6
38.6
33.6
31.6
30.2
50.5
38.5
33.3
30.6
27.7
27.1
21.6
21.6
21.6
21.6
21.3
21.6
19.8
19.8
19.8
19.8
19.3
19.8
32.6
27.1
26.3
23.8
30.1
27.9
27.1
22.6
21.7
18.4
21.5
18.5
UNITS
ns
ns
ns
ns
ns
ns
SWITCHING CHARACTERISTICS (continued)
(VCCA = 2.5V, unless otherwise noted.)
PARAMETER
tPLH
tPHL
tPLH
tPHL
tPZH
tPZL
tPZH
tPZL
tPHZ
tPLZ
tPHZ
tPLZ
FROM
(INPUT)
TO
(OUTPUT)
A
B
B
A
OE
A
OE
B
OE
A
OE
B
SG Micro Corp
www.sg-micro.com
VCCB = 1.2V
VCCB = 1.5V
VCCB =1.8V
VCCB = 2.5V
VCCB = 3.3V
VCCB = 5.0V
TYP
TYP
TYP
TYP
TYP
TYP
39.6
21.0
14.8
9.5
7.6
6.0
82.1
38.5
25.8
17.0
14.2
11.1
19.8
14.2
11.8
9.3
8.2
7.4
78.9
32.7
22.7
16.9
14.8
14.4
46.1
29.7
25.6
23.1
22.5
22.2
18.9
19.5
19.5
19.5
19.5
19.5
49.8
33.0
26.5
21.0
19.0
17.9
39.8
26.7
22.7
18.5
17.0
15.9
13.4
13.4
13.4
13.4
13.4
13.4
11.0
11.0
11.0
11.0
11.0
11.0
24.6
18.7
19.5
17.2
23.6
21.0
21.4
16.1
16.3
12.8
15.5
12.5
UNITS
ns
ns
ns
ns
ns
ns
DECEMBER 2017
7
8-Bit Dual-Supply Bus Transceiver with
Configurable Voltage Translation and 3-State Outputs
SGM8T245
SWITCHING CHARACTERISTICS (continued)
(VCCA = 3.3V, unless otherwise noted.)
PARAMETER
tPLH
tPHL
tPLH
tPHL
tPZH
tPZL
tPZH
tPZL
tPHZ
tPLZ
tPHZ
tPLZ
FROM
(INPUT)
TO
(OUTPUT)
A
B
B
A
OE
A
OE
B
OE
A
OE
B
VCCB = 1.2V
VCCB = 1.5V
VCCB =1.8V
VCCB = 2.5V
VCCB = 3.3V
VCCB = 5.0V
TYP
TYP
TYP
TYP
TYP
TYP
38.2
19.8
14.9
8.3
6.4
5.0
80.0
36.6
22.5
15.1
12.0
10.6
18.6
12.0
9.7
7.2
6.4
5.2
76.6
29.9
19.7
13.7
12.7
12.4
39.8
24.1
20.2
17.8
17.2
16.8
14.1
14.1
14.1
14.4
14.1
14.1
46.1
28.0
21.8
16.5
14.8
13.2
40.3
25.2
20.0
15.8
14.0
12.7
17.4
17.4
17.4
17.4
17.4
17.4
10.9
10.9
10.9
10.9
10.9
10.9
22.1
16.5
16.8
14.3
21.6
19.1
18.6
13.7
13.2
10.2
12.6
9.9
UNITS
ns
ns
ns
ns
ns
ns
SWITCHING CHARACTERISTICS (continued)
(VCCA = 5.0V, unless otherwise noted.)
PARAMETER
tPLH
tPHL
tPLH
tPHL
tPZH
tPZL
tPZH
tPZL
tPHZ
tPLZ
tPHZ
tPLZ
FROM
(INPUT)
TO
(OUTPUT)
A
B
B
A
OE
A
OE
B
OE
A
OE
B
VCCB = 1.2V
VCCB = 1.5V
VCCB =1.8V
VCCB = 2.5V
VCCB = 3.3V
VCCB = 5.0V
TYP
TYP
TYP
TYP
TYP
TYP
37.3
18.9
12.7
7.4
5.4
3.7
76.3
36.5
23.6
14.7
10.4
9.6
21.3
11.2
8.2
5.8
4.9
3.7
83.2
30.5
18.2
11.9
10.3
9.4
37.5
20.6
17.6
15.1
13.9
13.6
11.4
11.4
11.4
11.4
11.4
11.4
47.7
27.6
20.9
15.3
13.3
11.7
34.2
22.2
17.3
13.1
11.9
11.0
14.3
14.3
14.3
14.3
14.3
14.3
6.3
6.3
6.3
6.3
6.3
6.3
20.0
14.5
15.0
12.9
18.1
16.0
17.3
13.4
11.9
8.3
10.5
7.6
UNITS
ns
ns
ns
ns
ns
ns
OPERATING CHARACTERISTICS
(TA = +25℃, unless otherwise noted.)
VCCA/VCCB
PARAMETER
CPD
(1)
A to B
B to A
TEST CONDITIONS
CL = 0, f = 10MHz, tr = tf = 1ns
1.5V
1.8V
2.5V
3.3V
5.0V
TYP
TYP
TYP
TYP
TYP
0.5
0.5
0.9
0.7
1.4
0.5
0.5
0.5
0.6
0.7
UNITS
pF
NOTE: 1. Power dissipation capacitance per transceiver.
SG Micro Corp
www.sg-micro.com
DECEMBER 2017
8
8-Bit Dual-Supply Bus Transceiver with
Configurable Voltage Translation and 3-State Outputs
SGM8T245
TYPICAL APPLICATION CIRCUIT
1.2V
5.0V
0.1µF
0.1µF
VCCB
VCCA
DIR
1.2V
CONTROLLER
DATA
GND
OE
5.0V
SYSTEM
SGM8T245
A1
B1
A2
B2
A3
B3
A4
B4
A5
B5
A6
B6
A7
B7
A8
GND
B8
DATA
GND
Figure 1. Typical Application Circuit
SG Micro Corp
www.sg-micro.com
DECEMBER 2017
9
8-Bit Dual-Supply Bus Transceiver with
Configurable Voltage Translation and 3-State Outputs
SGM8T245
PARAMETER MEASUREMENT INFORMATION
S1
RL
From Output
Under Test
2 × VCCO
Open
GND
CL
(see Note 1)
RL
TEST
S1
tPD
tPLZ/tPZL
tPHZ/tPZH
Open
2 × VCCO
GND
Load Circuit
tW
VCCO
CL
RL
VTP
1.2V
1.5V ± 0.1V
1.8V ± 0.15V
2.5V ± 0.2V
3.3V ± 0.3V
5.0V ± 0.5V
15pF
15pF
15pF
15pF
15pF
15pF
2kΩ
2kΩ
2kΩ
2kΩ
2kΩ
2kΩ
0.1V
0.1V
0.15V
0.15V
0.3V
0.5V
VCCI
Input
VCCI/2
VCCI/2
0V
Voltage Waveforms
Pulse Duration
VCCA
Output
Control
(low-level
enabling)
VCCA/2
VCCA/2
tPZL
VCCI
Input
VCCI/2
VCCI/2
0V
tPLH
VCCO/2
VCCO/2
VCCO/2
VOL
0V
VCCO
VOL + VTP
VOL
tPZH
tPHL
VOH
Output
Output
Waveform 1
S1 at 2 × VCCO
(see Note 2)
tPLZ
Output
Waveform 2
S1 at GND
(see Note 2)
Voltage Waveforms
Propagation Delay Time
tPHZ
VCCO/2
VOH
VOH - VTP
0V
Voltage Waveforms
Enable and Disable Times
Figure 2. Load Circuit and Voltage Waveforms
NOTES:
1. CL includes probe and jig capacitance.
2. 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.
3. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10MHz, ZO = 50Ω, dv/dt ≥ 1V/ns.
4. The outputs are measured one at a time, with one transition per measurement.
5. tPLZ and tPHZ are the same as tDIS.
6. tPZL and tPZH are the same as tEN.
7. tPLH and tPHL are the same as tPD.
8. VCCI is the VCC associated with the input ports.
9. VCCO is the VCC associated with the output ports.
SG Micro Corp
www.sg-micro.com
DECEMBER 2017
10
SGM8T245
8-Bit Dual-Supply Bus Transceiver with
Configurable Voltage Translation and 3-State Outputs
DETAILED DESCRIPTION
Overview
The SGM8T245 is an 8-bit, dual supply non-inverting
bidirectional voltage-level translation. Pins A and
control pins (DIR and OE ) are supported by VCCA and
pins B are supported by VCCB. The A port is able to
accept I/O voltages ranging from 1.2V to 5.0V while the
B port can accept I/O voltages from 1.2V to 5.0V. A
high on DIR allows data transmission from A to B and a
low on DIR allows data transmission from B to A when
OE is set to low. When OE is set to high, both A and
B are in the high-impedance state.
Fully Configurable Dual-Rail Design Allows
Each Port to Operate Over the Full 1.2V to
5.0V Power-Supply Range
Both VCCA and VCCB can be supplied at any voltage
between 1.2V and 5.0V, making the device suitable for
translating between any of the low voltage nodes (1.2V,
1.5V, 1.8V, 2.5V, 3.3V and 5.0V).
Device Functional Modes
The SGM8T245 is a voltage-level translator that can
operate from 1.2V to 5.0V (VCCA) and 1.2V to 5.0V
(VCCB). The signal translation between 1.2V and 5.0V
requires direction control and output enable control.
When OE is low and DIR is high, data transmission is
from A to B. When OE is low and DIR is low, data
transmission is from B to A. When OE is high, both
output ports will be high-impedance.
Table 1. Function Table (Each 8-Bit Section)
INPUTS
OPERATION
DIR
OE
L
L
B data to A bus.
L
H
A data to B bus.
H
X
All outputs Hi-Z.
IOFF Supports Partial-Power-Down Mode
Operation
IOFF will prevent backflow current by disabling I/O output
circuits when device is in partial power-down mode.
SG Micro Corp
www.sg-micro.com
DECEMBER 2017
11
8-Bit Dual-Supply Bus Transceiver with
Configurable Voltage Translation and 3-State Outputs
SGM8T245
APPLICATION INFORMATION
The SGM8T245 can be used in level-translation
applications for interfacing devices or systems
operating at different interface voltages with one
another. The SGM8T245 is ideal for data transmission
which direction is different with each channel.
supply voltage from 1.2V to 5.0V and VCCB accepts any
supply voltage from 1.2V to 5.0V. The A port and B port
are designed to track VCCA and VCCB, respectively,
allowing for low-voltage bidirectional translation
between any of the 1.2V, 1.5V, 1.8V, 2.5V, 3.3V and
5.0V voltage nodes.
Design Requirements
The output-enable OE input circuit is designed so that
it is supplied by VCCA and when the OE input is high,
all outputs are placed in the high-impedance state. To
ensure the high-impedance state of the outputs during
power up or power down, the OE input pin must be
tied to VCCA through a pull-up resistor and must not be
enabled until VCCA and VCCB are fully ramped and stable.
The minimum value of the pull-up resistor to VCCA is
determined by the current-sinking capability of the
driver.
For this design example, use the parameters listed in
Table 2.
Table 2. Design Parameters
DESIGN PARAMETERS
EXAMPLE VALUE
Input Voltage Range
1.2V to 5.0V
Output Voltage Range
1.2V to 5.0V
Detailed Design Procedure
To begin the design process, determine the following:
1. Input voltage range
Use the supply voltage of the device that is driving the
SGM8T245 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.
2. Output voltage range
Use the supply voltage of the device that the
SGM8T245 is driving to determine the output voltage
range.
Layout Guidelines
To ensure reliability of the device, following common
printed-circuit board layout guidelines is recommended.
1. Bypass capacitors should be used on power
supplies.
2. Short trace lengths should be used to avoid
excessive loading.
3. Placing pads on the signal paths for loading
capacitors or pull-up resistors to help adjust rise and fall
times of signals depending on the system
requirements.
Power Supply Recommendations
The SGM8T245 uses two separate configurable
power-supply rails, VCCA and VCCB. VCCA accepts any
Application Curve
2V/div
Output
2V/div
Input
Time (200ns/div)
Figure 3. Translation Up (1.8V to 5.0V) at 2.5MHz
SG Micro Corp
www.sg-micro.com
DECEMBER 2017
12
SGM8T245
8-Bit Dual-Supply Bus Transceiver with
Configurable Voltage Translation and 3-State Outputs
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (DECEMBER 2017) to REV.A
Changed from product preview to production data .................................................................................................................................................All
SG Micro Corp
www.sg-micro.com
DECEMBER 2017
13
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
TSSOP-24
D
E1
5.94
E
1.78
b
e
0.42
0.65
RECOMMENDED LAND PATTERN (Unit: mm)
L
A
θ
A1
A2
c
H
Symbol
Dimensions
In Millimeters
MIN
MAX
A
A1
Dimensions
In Inches
MIN
MAX
1.100
0.020
0.150
0.043
0.001
0.006
A2
0.800
1.000
0.031
0.039
b
0.190
0.300
0.007
0.012
c
0.090
0.200
0.004
0.008
D
7.700
7.900
0.303
0.311
E
4.300
4.500
0.169
0.177
E1
6.250
6.550
0.246
0.258
e
L
0.650 BSC
0.500
H
θ
SG Micro Corp
www.sg-micro.com
0.026 BSC
0.700
0.02
0.25 TYP
1°
0.028
0.01 TYP
7°
1°
7°
TX00022.000
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
TQFN-5.5×3.5-24L
e1
k
D
N1
N24
N2
N23
D1
E1
E
e
N12
N13
b
b1
L
TOP VIEW
BOTTOM VIEW
4.1
2.7
0.70
2.05
A
SIDE VIEW
A1
A2
4.7
4.05
0.5
0.25
1.5
6.1
0.20
RECOMMENDED LAND PATTERN (Unit: mm)
Symbol
Dimensions
In Millimeters
MIN
MAX
Dimensions
In Inches
MIN
MAX
A
0.700
0.800
0.028
0.031
A1
0.000
0.050
0.000
0.002
A2
0.203 REF
0.008 REF
D
3.400
3.600
0.134
0.142
D1
1.950
2.150
0.077
0.085
E
5.400
5.600
0.213
0.220
E1
3.950
4.150
0.156
0.163
k
0.325 REF
0.013 REF
b
0.200
0.300
0.008
0.012
b1
0.150
0.250
0.006
0.010
L
0.300
0.500
0.012
0.020
e
0.500 BSC
0.020 BSC
e1
1.500 BSC
0.059 BSC
SG Micro Corp
www.sg-micro.com
TX00122.000
PACKAGE INFORMATION
TAPE AND REEL INFORMATION
REEL DIMENSIONS
TAPE DIMENSIONS
P2
W
P0
Q1
Q2
Q1
Q2
Q1
Q2
Q3
Q4
Q3
Q4
Q3
Q4
B0
Reel Diameter
K0
A0
P1
Reel Width (W1)
DIRECTION OF FEED
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF TAPE AND REEL
Reel
Diameter
Reel Width
W1
(mm)
A0
(mm)
B0
(mm)
K0
(mm)
P0
(mm)
P1
(mm)
P2
(mm)
W
(mm)
Pin1
Quadrant
TSSOP-24
13″
16.4
6.80
8.30
1.60
4.0
8.0
2.0
16.0
Q1
TQFN-5.5×3.5-24L
13″
12.4
3.80
5.80
1.00
4.0
8.0
2.0
12.0
Q1
SG Micro Corp
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TX10000.000
DD0001
Package Type
PACKAGE INFORMATION
CARTON BOX DIMENSIONS
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF CARTON BOX
Length
(mm)
Width
(mm)
Height
(mm)
Pizza/Carton
13″
386
280
370
5
SG Micro Corp
www.sg-micro.com
DD0002
Reel Type
TX20000.000
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