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Home > Products > Integrated Circuits (ICs) > Logic > Translators, Level Shifters

Analog Devices Inc. LTC1045CSW#TRPBF

Name: LTC1045CSW#TRPBF
Brand: Analog Devices Inc.
SKU: LTC1045CSW#TRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LTC1045CSW#TRPBF

Manufacturer:: Analog Devices Inc.

Category:: Translators, Level Shifters

Package:

Datasheet:: LTC1045CSW#TRPBF.pdf

Description:: IC TRNSLTR UNIDIRECTIONAL 20SOIC

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Product details

Overview

LTC1045CSW#TRPBF from Analog Devices (acquired Linear Technology) is a micropower hex level translator IC with six high-speed comparators, output latches, and three-state capability. It supports TTL/CMOS-to-±5V analog switch drive, ECL-to-CMOS translation (3V–15V V_CC), ground isolation buffering, and low-power RS232 line reception. Its programmable bias current enables 1.2µs response at 100µA supply current.

For engineers reviewing the LTC1045CSW#TRPBF datasheet, LTC1045CSW#TRPBF pinout, LTC1045CSW#TRPBF application, or LTC1045CSW#TRPBF equivalent, key selection considerations include its dual trip-point architecture (VTRIP1 for IN1–IN4, VTRIP2 for IN5–IN6), ±50V input tolerance with external 100kΩ limiting resistor, shutdown via ISET pin, three-state outputs controlled by DISABLE, and SO Wide 20-lead package compatibility with industrial temperature range (–40°C to 85°C).

Technical Context

The LTC1045CSW#TRPBF integrates six independent voltage comparators with linear input stages, each featuring separately accessible non-inverting inputs and shared inverting inputs grouped as VTRIP1 (pins 2–5) and VTRIP2 (pins 6–7). Internal hysteresis (7–20mV) enhances noise immunity and scales with programmed bias current.

Power/speed trade-off is implemented via an external resistor (R_SET) from ISET (pin 12) to V– (pin 10), enabling supply current adjustment from 10nA (shutdown) to 4.5mA. The ISET pin also provides latch control and full power-off functionality when driven to V+ – 0.5V, while DISABLE (pin 13) places all six outputs in high-impedance state.

Key Specifications

Parameter	Value and Actual Design Meaning
Total Supply Voltage (V+, VOH to V–, VOL)	18V absolute maximum - defines safe operating differential across all four supplies
Supply Current (I_SET = V+, R_SET = 10kΩ)	2.5–3.5mA typical - sets baseline speed/power point for six-channel operation
Shutdown Supply Current (DISABLE = ISET = V+)	10nA typical - enables near-zero static power in latched, inactive state
Response Time (R_SET = 10kΩ, ±100mV drive)	1.2µs typical - determines minimum pulse width support for level translation
Input Voltage Range	V– to (V– + 18V) - allows inputs to exceed V+ supply, supporting ±50V operation with 100kΩ limit resistor
Output Short-Circuit Sink/Source	7.5mA/4.0mA min - ensures robust drive into capacitive or resistive loads without damage
Operating Temperature Range	–40°C to +85°C - validated for industrial ambient conditions without derating

Pinout & Package

Package: 20-lead SO Wide (SW), 0.300-inch body width, RoHS-compliant, moisture-sensitive level 3 per J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
1 (VOH)	Output High Reference	Defines logic-high output voltage level; must be ≤ V+ and ≥ (V– + 3V)
2–7 (IN1–IN6)	Comparator Non-Inverting Inputs	Six independent signal inputs; IN1–IN4 reference VTRIP1, IN5–IN6 reference VTRIP2
8 (VTRIP2)	Trip Voltage for Comparators 5 & 6	Adjustable threshold (V– to V+ – 2V) for last two channels
9 (VTRIP1)	Trip Voltage for Comparators 1–4	Adjustable threshold (V– to V+ – 2V) for first four channels
10 (V–)	Comparator Negative Supply	Reference for internal bias and comparator common-mode range
11 (VOL)	Output Low Reference	Defines logic-low output voltage level; must be ≥ V– and ≤ (V+ – 3V)
12 (ISET)	Bias/Shutdown/Latch Control	Resistor-programmed bias current; forced to V+ shuts off power and latches outputs
13 (DISABLE)	Three-State Enable	Active-high control: logic high places all six outputs in Hi-Z state
14–19 (OUT1–OUT6)	Driver Outputs	CMOS-compatible buffered outputs with sourcing/sinking capability
20 (V+)	Comparator Positive Supply	Main positive supply rail; differential with V– must be ≥ 4.5V

Key Features

Feature	Design Value
Programmable Power/Speed	External R_SET on ISET pin adjusts supply current from 100µA to 4.5mA, scaling response time from 1.2µs to sub-100ns
Internal Hysteresis	7–20mV adjustable hysteresis improves noise margin without external components
Output Latches	Asynchronous latch function via ISET pin enables data hold during power-down or system sleep
Three-State Outputs	Single DISABLE pin controls Hi-Z state on all six outputs, enabling bus sharing and reduced loading
±50V Input Tolerance	Input breakdown >30V above V–; with 100kΩ series resistor, supports ±50V transient-safe interface

Applications

Ground Isolation Buffer	RS232 Line Receiver
Use Scenario: Interfacing logic between two systems with different ground potentials within common-mode range (e.g., isolated sensor node to host MCU). IC Role / Device Role / Timing Role: Level translator providing DC-coupled signal integrity while blocking ground-loop currents. Use Value: Eliminates need for optocouplers or transformers; supports up to ±50V ground offset with 100kΩ input protection.	Use Scenario: Converting ±3V to ±15V RS232 signals to TTL/CMOS logic levels for microcontroller UART input. IC Role / Device Role / Timing Role: Low-power line receiver translating negative-voltage RS232 inputs to single-supply logic outputs. Use Value: Achieves 1.2µs propagation delay at 100µA supply current-enabling battery-powered serial interfaces.
Flat Ribbon Cable Driver/Receiver	±5V Analog Switch Driver
Use Scenario: Driving and receiving signals over long flat ribbon cables (e.g., 66-ft, 150Ω Zo) between PCBs in industrial control cabinets. IC Role / Device Role / Timing Role: Hex translator with matched rise/fall times and latch capability for noise-immune cable signaling. Use Value: Maintains signal integrity across 66-ft cable using internal hysteresis and programmable slew rate via R_SET.	Use Scenario: Controlling CD4016-type CMOS analog switches requiring ±5V gate drive from 5V logic sources. IC Role / Device Role / Timing Role: Level-shifting driver generating complementary ±5V control signals for analog switch ON/OFF states. Use Value: Directly drives analog switch gates without external level-shifters; supports 100kΩ input protection for ±50V transients.

Ground Isolation Buffer

RS232 Line Receiver

Use Scenario: Interfacing logic between two systems with different ground potentials within common-mode range (e.g., isolated sensor node to host MCU).

IC Role / Device Role / Timing Role: Level translator providing DC-coupled signal integrity while blocking ground-loop currents.

Use Value: Eliminates need for optocouplers or transformers; supports up to ±50V ground offset with 100kΩ input protection.

Use Scenario: Converting ±3V to ±15V RS232 signals to TTL/CMOS logic levels for microcontroller UART input.

IC Role / Device Role / Timing Role: Low-power line receiver translating negative-voltage RS232 inputs to single-supply logic outputs.

Use Value: Achieves 1.2µs propagation delay at 100µA supply current-enabling battery-powered serial interfaces.

Flat Ribbon Cable Driver/Receiver

±5V Analog Switch Driver

Use Scenario: Driving and receiving signals over long flat ribbon cables (e.g., 66-ft, 150Ω Zo) between PCBs in industrial control cabinets.

IC Role / Device Role / Timing Role: Hex translator with matched rise/fall times and latch capability for noise-immune cable signaling.

Use Value: Maintains signal integrity across 66-ft cable using internal hysteresis and programmable slew rate via R_SET.

Use Scenario: Controlling CD4016-type CMOS analog switches requiring ±5V gate drive from 5V logic sources.

IC Role / Device Role / Timing Role: Level-shifting driver generating complementary ±5V control signals for analog switch ON/OFF states.

Use Value: Directly drives analog switch gates without external level-shifters; supports 100kΩ input protection for ±50V transients.

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex level translator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX3002ESE+	5-channel, fixed 3.3V/5V translation; no VTRIP1/VTRIP2 flexibility; no shutdown/latch	Limited to single-rail logic families; lacks analog switch drive capability	Choose for cost-sensitive, fixed-V_CC digital-only translation where latch/shutdown not required
SN74LVC16T245DGGR	16-bit bidirectional translator; 1.65–5.5V V_CC range; no ±50V input tolerance or hysteresis	Designed for high-speed digital buses; unsuitable for analog switch or RS232 drive	Choose for high-density, bidirectional logic-level translation in compact PCB layouts

Compared with MAX3002ESE+ and SN74LVC16T245DGGR, the LTC1045CSW#TRPBF uniquely combines programmable speed/power, dual trip-point thresholds, ±50V input robustness, and analog switch drive capability-making it irreplaceable in mixed-signal isolation and high-voltage interface applications.

Availability

LTC1045CSW#TRPBF is available at Aetrix Electronics and suitable for industrial automation, isolated sensor interfaces, RS232 subsystems, and analog switch control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC1045CSW#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. (ADI) acquired Linear Technology in 2017 and maintains its precision analog product lines with rigorous qualification and long-term support.

The LTC1045CSW#TRPBF belongs to Linear Technology's legacy LTCMOS™ precision comparator family, designed specifically for robust, low-power level translation in mixed-signal industrial and instrumentation systems where ground isolation and wide input voltage tolerance are critical.

FAQ

What is the maximum allowable voltage difference between V+ and V– on the LTC1045CSW#TRPBF?

The LTC1045CSW#TRPBF specifies a maximum differential of 18V between any two power pins (absolute maximum rating), with a recommended operating differential of 15V. For V+ and V– specifically, the minimum required differential is 4.5V to ensure proper comparator operation. Exceeding 15V in normal operation risks instability due to supply transients, as noted in datasheet Note 3.

How does the ISET pin control both bias current and shutdown on the LTC1045CSW#TRPBF?

The ISET pin on the LTC1045CSW#TRPBF serves three functions: (1) connecting an external resistor to V– sets bias current and thus response speed; (2) driving ISET to V+ – 0.5V shuts off all linear circuitry, reducing supply current to 10nA; and (3) the same V+ transition latches all six outputs in their last valid state. This dual functionality enables ultra-low-power hold modes without external memory.

Can the LTC1045CSW#TRPBF drive CD4016 analog switches directly, and what supply configuration is required?

Yes, the LTC1045CSW#TRPBF can directly drive CD4016 analog switches. Configure V+ = 5V, V– = –5V, VOH = 5V, and VOL = –5V to generate true ±5V gate drive. Output impedance remains low (ROH ≈ 260Ω, ROL ≈ 100Ω) under these conditions, ensuring fast switch turn-on/turn-off. The internal hysteresis prevents chatter during analog threshold crossings.

What is the purpose of separate VTRIP1 and VTRIP2 pins on the LTC1045CSW#TRPBF?

VTRIP1 (pin 9) sets the common threshold for comparators IN1–IN4, while VTRIP2 (pin 8) sets the threshold for IN5–IN6. This dual-trip architecture allows independent optimization-for example, using one threshold for digital logic translation and another for analog window detection or multi-level signaling. Each trip point is adjustable from V– to V+ – 2V, supporting flexible mixed-signal interfacing.

Does the LTC1045CSW#TRPBF require external pull-down resistors on its inputs?

No, the LTC1045CSW#TRPBF inputs have no internal clamp diodes and do not require external pull-down resistors. The datasheet explicitly notes "INPUTS HAVE NO INTERNAL PULL-DOWN" in the RS232 receiver application (TA12). However, for floating-input noise immunity in high-impedance applications, a weak pull-down (e.g., 100kΩ to V–) may be added externally without affecting specified ±50V input tolerance.

LTC1045CSW#TRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:

Packaging:: Tape & Reel (TR)

Product Status:: Active

Translator Type:: Voltage Level

Channel Type:: Unidirectional

Number of Circuits:: 1

Channels per Circuit:: 6

Voltage - VCCA:: 4.5 V ~ 15 V

Voltage - VCCB:: 3 V ~ 15 V

Input Signal:: -

Output Signal:: -

Output Type:: Tri-State, Non-Inverted

Data Rate:: -

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Features:: Programmable Power/Speed

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOIC (0.295", 7.50mm Width)

LTC1045CSW#TRPBF FAQ

1.How can I place an order for LTC1045CSW#TRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LTC1045CSW#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LTC1045CSW#TRPBF reliable?

The price and inventory of LTC1045CSW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1045CSW#TRPBF is usually 5 days.

3.What payment methods are accepted for LTC1045CSW#TRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1045CSW#TRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LTC1045CSW#TRPBF?

LTC1045CSW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC1045CSW#TRPBF order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LTC1045CSW#TRPBF?

For technical support, including LTC1045CSW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1045CSW#TRPBF requirements.

6.How does Aetrix verify that LTC1045CSW#TRPBF is sourced from the original manufacturer or authorized distributors?

All LTC1045CSW#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC1045CSW#TRPBF meets industry standards.

7.What is the process for return or replacement of LTC1045CSW#TRPBF?

All LTC1045CSW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1045CSW#TRPBF, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LTC1045CSW#TRPBF part is unused and in its original packaging.

Return procedure for LTC1045CSW#TRPBF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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