SN3257-Q1 4-Channel Switch Datasheet

SN3257-Q1 Datasheet, PDF, Equivalent


Part Number

SN3257-Q1

Description

4-Channel Switch

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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SN3257-Q1
SCDS411B – JULY 2019 – REVISED JANUARY 2020
SN3257-Q1 5-V, Low Propagation Delay, 2:1 (SPDT), 4-Channel Switch with 1.8 V Logic
1 Features
1 AEC-Q100 qualified for automotive application
– Temperature grade 1: -40°C to +125°C, TA
• Wide supply range: 1.5 V to 5.5 V
• Low propagation delay: 78 ps
• Low on-resistance: 5 Ω
• High bandwidth: 1.2 GHz
Bidirectional Signal Path
Supports Input Voltage Beyond Supply
1.8 V Logic Compatible
Integrated Pull Down Resistor on Logic Pins
Fail-Safe Logic
Powered-off Protection up to 3.6 V Signals
2 Applications
• SPI multiplexing
• I2S multiplexing
• eSIM multiplexing
• eMMC multiplexing
• Flash memory sharing
Battery management system (BMS)
Telematics control unit (TCU)
Smart telematics gateway
Rear seat entertainment
Digital cockpit processing unit
Automotive head unit
Automotive navigation
ADAS domain controller
Surround view system ECU
On-board (OBC) & wireless charger
3 Description
The SN3257-Q1 is an automotive grade
complementary metal-oxide semiconductor (CMOS)
switch that supports high speed signals with low
propagation delay. The SN3257-Q1 offers a 2:1
(SPDT) switch configuration with 4-channels making
it ideal for multi-lane protocols such as SPI and I2S.
The device supports bidirectional analog and digital
signals on the source (SxA, SxB) and drain (Dx) pins
and can pass signals above supply up to VDD x 2,
with a maximum input and output voltage of 5.5 V.
The SN3257-Q1 has an active low EN pin that is
used to enable and disable all channels
simultaneously. When the EN pin is LOW, one of the
two switch paths is selected based on the state of
SEL pin.
Powered-off protection up to 3.6 V on the signal path
of the SN3257-Q1 provides isolation when the supply
voltage is removed (VDD = 0 V). Without this
protection feature, switches can back-power the
supply rail through an internal ESD diode and cause
potential damage to the system.
Fail-safe logic circuitry allows voltages on the logic
control pins to be applied before the supply pin,
protecting the device from potential damage. Both
logic control inputs have 1.8 V logic compatible
thresholds, ensuring both TTL and CMOS logic
compatibility. Integrated pull down resistor on the
logic pins removes external components to reduce
system size and cost.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
SN3257-Q1
TSSOP (16)
5.00 mm × 4.40 mm
SOT-23-THIN (16) 4.20 mm x 2.00 mm
(1) For all available packages, see the package option addendum
at the end of the data sheet.
Application Example
VI/O
VDD
Processor / MCU /
Ext ernal Hea der #1
1.8V PORT
Log ic DEBUG,
I/O SPI, GPIO
S1A
S2A
S3A
S4A
Processor / MCU /
Ext ernal Hea der #2
1.8V PORT
Log ic DEBUG,
I/O SPI, GPIO
S1B
S2B
S3B
S4B
VDD 0.1µF
VDD
SPI / eSIM / eMMC
Device
D1 MIS O / CMD / GPIO
D2 MOSI / CLK / GPIO
D3 SCLK / DAT0 / GPIO
D4 SS / DAT1 / GPIO
SEL
EN
GND
1.8V Control L ogic
From P rocessor / MCU
1
Block Diagram
SN325 7-Q1
S1A
S1B
S2A
S2B
S3A
S3B
S4A
S4B
LOGIC CONTRO L*
D1
D2
D3
D4
SEL EN
*Internal 6MO Pull-Down on Logic P ins
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.

SN3257-Q1
SN3257-Q1
SCDS411B – JULY 2019 – REVISED JANUARY 2020
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 Dynamic Characteristics ........................................... 6
6.7 Timing Requirements ................................................ 7
6.8 Typical Characteristics .............................................. 8
7 Parameter Measurement Information ................ 11
7.1 On-Resistance ........................................................ 11
7.2 Off-Leakage Current ............................................... 11
7.3 On-Leakage Current ............................................... 12
7.4 IPOFF Leakage Current ............................................ 12
7.5 Transition Time ....................................................... 13
7.6 tON (EN) and tOFF (EN) Time....................................... 13
7.7 tON (VDD) and tOFF (VDD) Time................................... 14
7.8 Break-Before-Make Delay....................................... 14
7.9 Propagation Delay................................................... 15
7.10 Skew ..................................................................... 15
7.11 Charge Injection .................................................... 16
7.12 Capacitance .......................................................... 16
7.13 Off Isolation ........................................................... 17
7.14 Channel-to-Channel Crosstalk .............................. 17
7.15 Bandwidth ............................................................. 18
8 Detailed Description ............................................ 19
8.1 Overview ................................................................. 19
8.2 Functional Block Diagram ....................................... 19
8.3 Feature Description................................................. 19
8.4 Device Functional Modes........................................ 21
9 Application and Implementation ........................ 22
9.1 Application Information............................................ 22
9.2 Typical Application ................................................. 22
10 Power Supply Recommendations ..................... 23
11 Layout................................................................... 24
11.1 Layout Guidelines ................................................. 24
11.2 Layout Example .................................................... 25
12 Device and Documentation Support ................. 26
12.1 Documentation Support ........................................ 26
12.2 Receiving Notification of Documentation Updates 26
12.3 Community Resources.......................................... 26
12.4 Trademarks ........................................................... 26
12.5 Electrostatic Discharge Caution ............................ 26
12.6 Glossary ................................................................ 26
13 Mechanical, Packaging, and Orderable
Information ........................................................... 26
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision A (August 2016) to Revision B
Page
• Changed the document status From: Advanced Information To: Production Data ............................................................... 1
2 Submit Documentation Feedback
Product Folder Links: SN3257-Q1
Copyright © 2019–2020, Texas Instruments Incorporated


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity SN3257-Q1 SCDS411B – JULY 201 9 – REVISED JANUARY 2020 SN3257-Q1 5- V, Low Propagation Delay, 2:1 (SPDT), 4 -Channel Switch with 1.8 V Logic 1 Fea tures •1 AEC-Q100 qualified for autom otive application – Temperature grade 1: -40°C to +125°C, TA • Wide supp ly range: 1.5 V to 5.5 V • Low propag ation delay: 78 ps • Low on-resistanc e: 5 Ω • High bandwidth: 1.2 GHz • Bidirectional Signal Path • Supports Input Voltage Beyond Supply • 1.8 V Logic Compatible • Integrated Pull Do wn Resistor on Logic Pins • Fail-Safe Logic • Powered-off Protection up to 3.6 V Signals 2 Applications • SPI m ultiplexing • I2S multiplexing • eS IM multiplexing • eMMC multiplexing Flash memory sharing • Battery man agement system (BMS) • Telematics con trol unit (TCU) • Smart telematics ga teway • Rear seat entertainment • D igital cockpit processing unit • Automotive head unit • Automotive navigation • ADAS domain controller • Surround .
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