SGM4578
8-Bit Bidirectional Voltage-Level Translator
for Open-Drain and Push-Pull Applications
GENERAL DESCRIPTION
FEATURES
This 8-bit non-inverting translator is a bidirectional
● No Direction-Control Signal Needed
voltage-level translator and can be used to establish
● Data Rates
digital switching compatibility between mixed-voltage
24Mbps (Push-Pull)
systems. It uses two separate configurable power-
2Mbps (Open-Drain)
supply rails, with the A ports supporting operating
● 1.65V to 5.5V on A Ports and 2.3V to 5.5V on B
Ports (VCCA ≤ VCCB)
voltages from 1.65V to 5.5V while it tracks the VCCA
supply, and the B ports supporting operating voltages
● VCC Isolation: If Either VCC is at GND,
Both Ports are in the High-Impedance State
from 2.3V to 5.5V while it tracks the VCCB supply. This
allows the support of both lower and higher logic signal
● No Power-Supply Sequencing Required:
levels while providing bidirectional translation capabilities
Either VCCA or VCCB can be Ramped First
between any of the 1.8V, 2.5V, 3.3V and 5V voltage
● IOFF: Supports Partial-Power-Down Mode Operation
nodes.
● -40℃ to +85℃ Operating Temperature Range
When the output-enable (OE) input is low, all I/Os are
● Available in Green TSSOP-20 and TQFN-3×3-20L
Packages
placed in the high-impedance state, which significantly
reduces the power-supply quiescent current consumption.
OE has an internal pull-down current source, as long as
VCCA is powered.
To ensure the high-impedance state during power up or
power down, OE should be tied to GND through a
pull-down resistor; the minimum value of the resistor is
determined by the current-sourcing capability of the
driver.
The SGM4578 is available in the Green TSSOP-20 and
APPLICATIONS
2
I C/SMBus
UART
GPIO
TYPICAL APPLICATION
3.3V
1.8V
TQFN-3×3-20L packages. It operates over an ambient
0.1µF
0.1µF
temperature range of -40℃ to +85℃.
VCCA
VCCB
OE
1.8V
System
Controller
DATA
GND
A1
A2
A3
A4
A5
A6
A7
A8
SGM4578
GND
B1
B2
B3
B4
B5
B6
B7
B8
3.3V
System
Controller
DATA
GND
Figure 1. Typical Application Circuit
SG Micro Corp
www.sg-micro.com
JUNE 2018 – REV. A
8-Bit Bidirectional Voltage-Level Translator
for Open-Drain and Push-Pull Applications
SGM4578
PACKAGE/ORDERING INFORMATION
MODEL
PACKAGE
DESCRIPTION
SPECIFIED
TEMPERATURE
RANGE
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
TSSOP-20
-40℃ to +85℃
SGM4578YTS20G/TR
SGM4578YTS20
XXXXX
Tape and Reel, 4000
TQFN-3×3-20L
-40℃ to +85℃
SGM4578YTQG20G/TR
SGM
4578QG
XXXXX
Tape and Reel, 4000
SGM4578
MARKING INFORMATION
NOTE: XXXXX = Date Code and Vendor Code.
XXXXX
Vendor Code
Date Code - Week
Date Code - Year
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.
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.
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.
SG Micro Corp
www.sg-micro.com
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.
JUNE 2018
2
SGM4578
8-Bit Bidirectional Voltage-Level Translator
for Open-Drain and Push-Pull Applications
ABSOLUTE MAXIMUM RATINGS
Supply Voltage Range
VCCA ................................................................... -0.3V to 6V
VCCB ................................................................... -0.3V to 6V
(1)
A Ports, B Ports, OE Input Voltage Range, VI
............................................................................. -0.3V to 6V
Voltage Range Applied to Any Output in the High-Impedance
(1)
or Power-Off State, VO
A Ports ............................................................... -0.3V to 6V
B Ports ............................................................... -0.3V to 6V
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) ................................... -50mA
Output Clamp Current, IOK (VO < 0).............................. -25mA
Continuous Output Current, IO .................................... ±50mA
Continuous Current through VCCA, VCCB, or GND ...... ±100mA
Junction Temperature .................................................+150℃
Storage Temperature Range ........................ -65℃ to +150℃
Lead Temperature (Soldering, 10s) ............................+260℃
ESD Susceptibility
HBM ............................................................................. 4000V
MM ................................................................................. 300V
CDM ............................................................................ 1000V
RECOMMENDED OPERATING CONDITIONS
(3, 4)
(5)
Supply Voltage Range
VCCA ................................................................ 1.65V to 5.5V
VCCB .................................................................. 2.3V to 5.5V
High-Level Input Voltage, VIH
A Port I/Os (VCCA = 1.65V, VCCB = 2.3V to 5.5V)
................................................................ VCCI - 0.1V to VCCI
A Port I/Os (VCCA = 1.95V to 5.5V, VCCB = 2.3V to 5.5V)
................................................................ VCCI - 0.4V to VCCI
B Port I/Os ............................................... VCCI - 0.4V to VCCI
OE Input ................................................VCCA × 0.8V to 5.5V
Low-Level Input Voltage, VIL
A Port I/Os ......................................................... 0V to 0.15V
B Port I/Os ......................................................... 0V to 0.15V
OE Input .................................................0V to VCCA × 0.25V
Operating Temperature Range ...................... -40℃ to +85℃
NOTES:
3. VCCI is the VCC associated with the input ports.
4. VCCO is the VCC associated with the output ports.
5. VCCA must be less than or equal to VCCB, and VCCA must not
exceed 5.5V.
NOTES:
1. The input and output negative-voltage ratings may be
exceeded if the input and output current ratings are observed.
2. The value of VCCA and VCCB are provided in the
recommended operating conditions table.
SG Micro Corp
www.sg-micro.com
JUNE 2018
3
8-Bit Bidirectional Voltage-Level Translator
for Open-Drain and Push-Pull Applications
SGM4578
PIN CONFIGURATIONS
(TOP VIEW)
A1
1
20
B1
VCCA
2
19
VCCB
A2
3
18
B2
(TOP VIEW)
A3
4
17
B3
A4
5
16
B4
A5
6
15
B5
A6
7
14
B6
A7
8
13
B7
9
12
B8
OE 10
11
GND
A8
TSSOP-20
VCCA
A1
B1
VCCB
B2
20
19
18
17
16
A2
1
15 B3
A3
2
14 B4
A4
3
A5
4
A6
5
GND
13 B5
12 B6
11 B7
6
7
A7
A8
8
9
OE GND
10
B8
TQFN-3×3-20L
PIN DESCRIPTION
PIN
NAME
TYPE
19
A1
I/O
2
20
VCCA
S
3
1
A2
I/O
Input/Output 2. Referenced to VCCA.
4
2
A3
I/O
Input/Output 3. Referenced to VCCA.
5
3
A4
I/O
Input/Output 4. Referenced to VCCA.
6
4
A5
I/O
Input/Output 5. Referenced to VCCA.
7
5
A6
I/O
Input/Output 6. Referenced to VCCA.
8
6
A7
I/O
Input/Output 7. Referenced to VCCA.
9
7
A8
I/O
TSSOP-20
TQFN-3×3-20L
1
FUNCTION
Input/Output 1. Referenced to VCCA.
A Ports Supply Voltage. 1.65V ≤ VCCA ≤ 5.5V and VCCA ≤ VCCB.
Input/Output 8. Referenced to VCCA.
10
8
OE
I
Output Enable (Active High). Pull OE low to place all outputs in
3-state mode. Referenced to VCCA.
11
9
GND
S
Ground.
12
10
B8
I/O
Input/Output 8. Referenced to VCCB.
13
11
B7
I/O
Input/Output 7. Referenced to VCCB.
14
12
B6
I/O
Input/Output 6. Referenced to VCCB.
15
13
B5
I/O
Input/Output 5. Referenced to VCCB.
16
14
B4
I/O
Input/Output 4. Referenced to VCCB.
17
15
B3
I/O
Input/Output 3. Referenced to VCCB.
18
16
B2
I/O
19
17
VCCB
S
20
18
B1
I/O
―
Exposed Pad
GND
―
SG Micro Corp
www.sg-micro.com
Input/Output 2. Referenced to VCCB.
B Ports Supply Voltage. 2.3V ≤ VCCB ≤ 5.5V.
Input/Output 1. Referenced to VCCB.
Exposed pad should be soldered to PCB board and connected
to GND or left floating.
JUNE 2018
4
8-Bit Bidirectional Voltage-Level Translator
for Open-Drain and Push-Pull Applications
SGM4578
ELECTRICAL CHARACTERISTICS
(VCCA = 1.65V to 5.5V, VCCB = 2.3V to 5.5V, Full = -40℃ to +85℃, typical values are at TA = +25℃, unless otherwise noted.)
PARAMETER
CONDITIONS
TEMP
MIN
VCCA × 0.67
TYP
MAX
UNITS
ELECTRICAL CHARACTERISTICS
A Ports High Level Output Voltage (VOHA)
IOH = -20µA, VIB ≥ VCCB - 0.4V
Full
A Ports Low Level Output Voltage (VOLA)
IOL = 1mA, VIB ≤ 0.15V
Full
B Ports High Level Output Voltage (VOHB)
IOH = -20µA, VIA ≥ VCCA - 0.4V
Full
B Ports Low Level Output Voltage (VOLB)
IOL = 1mA, VIA ≤ 0.15V
Full
0.4
+25℃
±1
Full
±1.5
+25℃
±0.5
Full
±1
+25℃
±0.5
Full
±1
+25℃
±0.5
Full
±1
VCCA = 1.65V to VCCB,
VCCB = 2.3V to 5.5V
Full
13
VCCA = 5.5V, VCCB = 0V
Full
13
VCCA = 0V, VCCB = 5.5V
Full
-1
VCCA = 1.65V to VCCB,
VCCB = 2.3V to 5.5V
Full
17
VCCA = 5.5V, VCCB = 0V
Full
-1
VCCA = 0V, VCCB = 5.5V
Full
8
Full
21
μA
Full
13
μA
Full
8
μA
Input Leakage Current (II)
OE
A Ports
Power Off Leakage Current
(IOFF)
3-State Output Leakage
(IOZ)
B Ports
VCCA = 0V to 5.5V, VCCB = 0V
A or B Ports OE = 0V
Quiescent Supply Current (ICCA)
Quiescent Supply Current (ICCB)
Quiescent Supply Current (ICCA + ICCB)
Quiescent Supply Current (ICCZA)
Quiescent Supply Current (ICCZB)
OE Input Capacitance (CI)
Input/Output Capacitance A Ports (CIO)
Input/Output Capacitance B Ports (CIO)
SG Micro Corp
www.sg-micro.com
VCCA = 0V, VCCB = 0V to 5.5V
VI = VO = OPEN,
IO = 0
VI = VO = OPEN,
IO = 0
VI = VO = OPEN,
IO = 0
VI = VCCI or 0V,
IO = 0, OE = 0V
VI = VCCI or 0V,
IO = 0, OE = 0V
VCCA = 1.65V to VCCB,
VCCB = 2.3V to 5.5V
VCCA = 1.65V to VCCB,
VCCB = 2.3V to 5.5V
VCCA = 1.65V to VCCB,
VCCB = 2.3V to 5.5V
VCCA = 3.3V, VCCB = 3.3V
VCCA = 3.3V, VCCB = 3.3V
0.4
VCCB × 0.67
+25℃
6
+25℃
6
+25℃
6
V
μA
μA
μA
μA
μA
pF
pF
JUNE 2018
5
8-Bit Bidirectional Voltage-Level Translator
for Open-Drain and Push-Pull Applications
SGM4578
TIMING REQUIREMENTS
VCCB = 2.5V
VCCB = 3.3V
VCCB = 5V
TYP
TYP
TYP
Push-Pull Driving
24
24
24
Open-Drain Driving
2
2
2
PARAMETER
UNITS
(TA = +25℃, VCCA = 1.8V, unless otherwise noted.)
Data Rate
Pulse Duration (tW)
Push-Pull Driving
41
41
41
500
500
500
Push-Pull Driving
24
24
24
Open-Drain Driving
2
2
2
41
41
41
500
500
500
Push-Pull Driving
24
24
Open-Drain Driving
2
2
41
41
500
500
Open-Drain Driving
Data Inputs
Mbps
ns
(TA = +25℃, VCCA = 2.5V, unless otherwise noted.)
Data Rate
Pulse Duration (tW)
Push-Pull Driving
Open-Drain Driving
Data Inputs
Mbps
ns
(TA = +25℃, VCCA = 3.3V, unless otherwise noted.)
Data Rate
Pulse Duration (tW)
Push-Pull Driving
Open-Drain Driving
Data Inputs
Mbps
ns
(TA = +25℃, VCCA = 5V, unless otherwise noted.)
Data Rate
Pulse Duration (tW)
Push-Pull Driving
24
Open-Drain Driving
2
Push-Pull Driving
Open-Drain Driving
SG Micro Corp
www.sg-micro.com
Data Inputs
41
500
Mbps
ns
JUNE 2018
6
8-Bit Bidirectional Voltage-Level Translator
for Open-Drain and Push-Pull Applications
SGM4578
SWITCHING CHARACTERISTICS
(TA = +25℃, VCCA = 1.8V, unless otherwise noted.)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
tPHL
A
B
tPLH
tPHL
TEST
CONDITIONS
VCCB = 2.5V
VCCB = 3.3V
VCCB = 5V
TYP
TYP
TYP
Push-Pull Driving
3.5
3.5
5.1
Open-Drain Driving
56.2
27.0
27.9
Push-Pull Driving
5.1
4.5
4.4
Open-Drain Driving
142.7
119.8
92.1
Push-Pull Driving
3.0
2.8
3.4
Open-Drain Driving
25.6
25.3
25.4
Push-Pull Driving
3.7
3.2
2.6
Open-Drain Driving
B
A
55.1
49.4
48.0
tEN (tPZH & tPZL)
OE
A or B
28.4
24.6
22.5
tDIS (tPHZ & tPLZ)
OE
A or B
674
677
671
tPLH
trA
A Ports Rise Time
trB
B Ports Rise Time
tfA
A Ports Fall Time
tfB
B Ports Fall Time
Data Rate
Push-Pull Driving
7.2
8.1
9.1
Open-Drain Driving
12.3
11.3
10.1
Push-Pull Driving
7.2
6.1
5.4
Open-Drain Driving
99.3
72.9
36.7
Push-Pull Driving
5.7
5.9
6.9
Open-Drain Driving
3.8
3.6
3.6
Push-Pull Driving
7.9
7.8
8.4
Open-Drain Driving
3.5
8.4
5.0
Push-Pull Driving
24
24
24
Open-Drain Driving
2
2
2
UNITS
ns
ns
ns
ns
ns
ns
ns
Mbps
SWITCHING CHARACTERISTICS (continued)
(TA = +25℃, VCCA = 2.5V, unless otherwise noted.)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
tPHL
A
B
tPLH
tPHL
B
A
tPLH
TEST
CONDITIONS
VCCB = 2.5V
VCCB = 3.3V
VCCB = 5V
TYP
TYP
TYP
Push-Pull Driving
4.5
4.5
5.0
Open-Drain Driving
26.2
27.1
26.2
Push-Pull Driving
3.8
3.3
3.1
Open-Drain Driving
111.0
95.6
76.0
Push-Pull Driving
4.2
4.0
4.1
Open-Drain Driving
25.8
25.5
25.6
Push-Pull Driving
3.7
3.5
3.6
Open-Drain Driving
52.7
50.6
49.8
tEN (tPZH & tPZL)
OE
A or B
21.6
17.4
15.5
tDIS (tPHZ & tPLZ)
OE
A or B
689
688
678
Push-Pull Driving
6.4
6.7
6.9
Open-Drain Driving
10.5
7.7
7.8
trA
A Ports Rise Time
trB
B Ports Rise Time
tfA
A Ports Fall Time
tfB
B Ports Fall Time
Data Rate
SG Micro Corp
www.sg-micro.com
Push-Pull Driving
6.2
5.4
4.9
Open-Drain Driving
67.0
50.9
30.5
Push-Pull Driving
8.6
8.2
7.3
Open-Drain Driving
3.6
3.3
3.1
Push-Pull Driving
8.5
7.7
8.1
Open-Drain Driving
3.4
3.9
5.4
Push-Pull Driving
24
24
24
Open-Drain Driving
2
2
2
UNITS
ns
ns
ns
ns
ns
ns
ns
Mbps
JUNE 2018
7
8-Bit Bidirectional Voltage-Level Translator
for Open-Drain and Push-Pull Applications
SGM4578
SWITCHING CHARACTERISTICS (continued)
(TA = +25℃, VCCA = 3.3V, unless otherwise noted.)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
tPHL
A
B
tPLH
tPHL
TEST
CONDITIONS
VCCB = 3.3V
VCCB = 5V
TYP
TYP
Push-Pull Driving
4.4
5.0
Open-Drain Driving
25.5
27.5
Push-Pull Driving
3.5
2.7
Open-Drain Driving
52.4
51.4
Push-Pull Driving
4.1
4.4
Open-Drain Driving
25.8
54.3
Push-Pull Driving
3.1
2.8
B
A
50.3
49.4
tEN (tPZH & tPZL)
OE
A or B
15.9
13.8
tDIS (tPHZ & tPLZ)
OE
A or B
699
678
tPLH
Open-Drain Driving
trA
A Ports Rise Time
trB
B Ports Rise Time
tfA
A Ports Fall Time
tfB
B Ports Fall Time
Data Rate
Push-Pull Driving
5.2
6.2
Open-Drain Driving
6.3
6.2
Push-Pull Driving
5.3
4.7
Open-Drain Driving
8.3
6.8
Push-Pull Driving
7.3
7.6
Open-Drain Driving
3.1
3.0
Push-Pull Driving
7.7
7.3
Open-Drain Driving
3.8
4.6
Push-Pull Driving
24
24
Open-Drain Driving
2
2
UNITS
ns
ns
ns
ns
ns
ns
ns
Mbps
SWITCHING CHARACTERISTICS (continued)
(TA = +25℃, VCCA = 5V, unless otherwise noted.)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
tPHL
A
B
tPLH
tPHL
TEST
CONDITIONS
VCCB = 5V
TYP
Push-Pull Driving
5.3
Open-Drain Driving
27.4
Push-Pull Driving
2.4
Open-Drain Driving
50.6
Push-Pull Driving
5.0
Open-Drain Driving
26.3
Push-Pull Driving
2.2
Open-Drain Driving
49.3
B
A
tEN (tPZH & tPZL)
OE
A or B
22.6
tDIS (tPHZ & tPLZ)
OE
A or B
665
tPLH
trA
A Ports Rise Time
trB
B Ports Rise Time
tfA
A Ports Fall Time
tfB
B Ports Fall Time
Data Rate
SG Micro Corp
www.sg-micro.com
Push-Pull Driving
5.3
Open-Drain Driving
5.0
Push-Pull Driving
4.9
Open-Drain Driving
6.5
Push-Pull Driving
8.5
Open-Drain Driving
2.8
Push-Pull Driving
7.7
Open-Drain Driving
4.2
Push-Pull Driving
24
Open-Drain Driving
2
UNITS
ns
ns
ns
ns
ns
ns
ns
Mbps
JUNE 2018
8
8-Bit Bidirectional Voltage-Level Translator
for Open-Drain and Push-Pull Applications
SGM4578
PARAMETER MEASUREMENT INFORMATION
VCCI
VCCO
VCCI
VCCO
DUT
DUT
OUT
IN
OUT
IN
15pF
15pF
1MΩ
1MΩ
Data Rate (10pF), Pulse Duration (10pF),
Propagation Delay, Output Rise-Time and Fall-Time
Measurement Using An Open-Drain Driver
Data Rate, Pulse Duration, Propagation Delay,
Output Rise-Time and Fall-Time Measurement
Using A Push-Pull Driver
2 × VCCO
50kΩ
S1
Open
From Output
Under Test
15pF
50kΩ
Load Circuit for Enable/Disable
Time Measurement
TEST
tPZL/tPLZ (tDIS)
tPHZ/tPZH (tEN)
S1
2 × VCCO
Open
tW
VCCI
Input
VCCI/2
VCCI/2
0V
Voltage Waveforms
Pulse Duration
VCCI/2
0V
tPHL
tPLH
Output
VCCO/2
0.9 × VCCO
0.1 × VCCO
tr
VOH
VCCO/2
VOL
tf
VCCA/2
tPLZ
Output Waveform 1
S1 at 2 × VCCO
(see Note 2)
0.1 × VCCO
VCCO/2
VCCO
VOL
tPHZ
tPZH
Output Waveform 2
S1 at OPEN
(see Note 2)
Voltage Waveforms
Propagation Delay Times
VCCA/2
0V
tPZL
VCCI
VCCI/2
Input
VCCA
Output
Control
(high-level
enabling)
0.9 × VCCO
VOH
VCCO/2
0V
Voltage Waveforms
Enable and Disable Times
Figure 2. Load Circuits 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.
10. All parameters and waveforms are not applicable to all devices.
SG Micro Corp
www.sg-micro.com
JUNE 2018
9
8-Bit Bidirectional Voltage-Level Translator
for Open-Drain and Push-Pull Applications
SGM4578
DETAILED DESCRIPTION
Overview
The SGM4578 can be used to bridge the digitalswitching compatibility gap between two voltage nodes
to successfully interface logic threshold levels found in
electronic systems. It should be used in a point-to-point
topology for interfacing devices or systems operating at
different interface voltages with one another. Its primary
target application is for interfacing with open-drain
2
drivers on the data I/Os such as I C or 1-wire, where
the data is bidirectional and no control signal is
available. The SGM4578 can also be used in
applications where a push-pull driver is connected to
the data I/Os.
Architecture
The SGM4578 architecture (see Figure 3) is an
auto-direction-sensing based translator that does not
require a direction-control signal to control the direction
of data flow from A to B or from B to A.
These two bidirectional channels independently determine
the direction of data flow without a direction-control
signal. Each I/O pin can be automatically reconfigured
as either an input or an output, which is how this
auto-direction feature is realized.
VCCB
VCCA
T1
One-Shot
One-Shot
T2
R1
10kΩ
R2
10kΩ
Gate Bias
A
N
Figure 3. Architecture of a SGM4578 Cell
SG Micro Corp
www.sg-micro.com
B
The SGM4578 employs two key circuits to enable this
voltage translation:
An N-channel pass-gate transistor topology that ties
the A port to the B port.
Output one-shot (O.S.) edge-rate accelerator circuitry
to detect and accelerate rising edges on the A or B
ports.
Input Driver Requirements
The fall time (tfA, tfB) of a signal depends on the output
impedance of the external device driving the data I/Os
of the SGM4578. Similarly, the tPHL and data rates also
depend on the output impedance of the external driver.
The values for tfA, tfB, tPHL, and data rates in the
datasheet assume that the output impedance of the
external driver is less than 50Ω.
Power Up
During operation, ensure that VCCA ≤ VCCB at all times.
The sequencing of each power supply will not damage
the device during the power up operation, so either
power supply can be ramped up first.
Output Load Considerations
We recommend careful PCB layout practices with short
PCB trace lengths to avoid excessive capacitive
loading and to ensure that proper O.S. triggering takes
place. PCB signal trace-lengths should be kept short
enough such that the round trip delay of any reflection
is less than the one-shot duration. This improves signal
integrity by ensuring that any reflection sees a low
impedance at the driver. The O.S. circuits have been
designed to stay on for approximately 30ns. The
maximum capacitance of the lumped load that can be
driven also depends directly on the one-shot duration.
With very heavy capacitive loads, the one-shot can be
time-out before the signal is driven fully to the positive
rail. The O.S. duration has been set to optimize
trade-offs between dynamic ICC, load driving capability,
and maximum bit-rate considerations. Both PCB trace
length and connectors add to the capacitance that the
SGM4578 output sees, so it is recommended that this
lumped-load capacitance be considered to avoid O.S.
retriggering, bus contention, output signal oscillations,
or other adverse system-level effects.
JUNE 2018
10
SGM4578
8-Bit Bidirectional Voltage-Level Translator
for Open-Drain and Push-Pull Applications
DETAILED DESCRIPTION (continued)
Enable and Disable
The SGM4578 has an OE input that is used to disable
the device by setting OE low, which places all I/Os in
the Hi-Z state. OE has an internal pull-down current
source, as long as VCCA is powered. The disable time
(tDIS) indicates the delay between the time when OE
goes low and when the outputs are disabled (Hi-Z). The
enable time (tEN) indicates the amount of time the user
must allow for the one-shot circuitry to become
operational after OE is taken high.
Pull-Up or Pull-Down Resistors on I/O Lines
Each A port I/O has an internal 10kΩ pull-up resistor to
VCCA, and each B port I/O has an internal 10kΩ pull-up
resistor to VCCB. If a smaller value of pull-up resistor is
required, an external resistor must be added from the
I/O to VCCA or VCCB (in parallel with the internal 10kΩ
resistors). Adding lower value pull-up resistors will
affect VOL levels, however. The internal pull-ups of the
SGM4578 are disabled when the OE pin is low.
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (JUNE 2018) to REV.A
Changed from product preview to production data ............................................................................................................................................. All
SG Micro Corp
www.sg-micro.com
JUNE 2018
11
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
TSSOP-20
D
5.94
E
E1
1.78
b
e
0.42
0.65
RECOMMENDED LAND PATTERN (Unit: mm)
L
A
A1
θ
A2
Symbol
c
H
Dimensions
In Millimeters
MIN
MAX
Dimensions
In Inches
MIN
MAX
1.100
0.043
A
A1
0.050
0.150
0.002
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
6.400
6.600
0.252
0.259
E
4.300
4.500
0.169
0.177
E1
6.250
6.550
0.246
0.258
0.700
0.02
7°
1°
e
L
0.650 BSC
0.500
H
θ
SG Micro Corp
www.sg-micro.com
0.026 BSC
0.25 TYP
1°
0.028
0.01 TYP
7°
TX00021.000
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
TQFN-3×3-20L
D
e
L
D1
E
E1
N20
k
N1
b
BOTTOM VIEW
TOP VIEW
1.5
0.7
A
3.5 2.1 1.5
A1
A2
SIDE VIEW
0.4
0.2
RECOMMENDED LAND PATTERN (Unit: mm)
Symbol
Dimensions
In Millimeters
MIN
MAX
A
0.700
A1
0.000
A2
Dimensions
In Inches
MIN
MAX
0.800
0.028
0.050
0.000
0.203 REF
0.031
0.002
0.008 REF
D
2.924
3.076
0.115
0.121
D1
1.400
1.600
0.055
0.063
E
2.924
3.076
0.115
0.121
E1
1.400
1.600
0.055
0.063
0.250
0.006
k
b
0.200 MIN
0.150
e
L
SG Micro Corp
www.sg-micro.com
0.008 MIN
0.400 TYP
0.324
0.010
0.016 TYP
0.476
0.013
0.019
TX00082.000
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
A0
P1
K0
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-20
13″
12.4
6.80
6.85
1.70
4.0
8.0
2.0
12.0
Q1
TQFN-3×3-20L
13″
12.4
3.30
3.30
1.10
4.0
8.0
2.0
12.0
Q2
SG Micro Corp
www.sg-micro.com
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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