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Analog Devices Inc. LTC1045CJ
- Part No.:
- LTC1045CJ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
LTC1045CJ.pdf
- Description:
- IC TRANSLATOR UNIDIR 20CERDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,544
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Product details
Overview
LTC1045CJ from Analog Devices (formerly Linear Technology) is a micropower hex level translator IC featuring six independent high-speed comparators with latched three-state outputs, ±5V analog switch drive capability, TTL-to-CMOS/CMOS-to-TTL/ECL-to-CMOS translation, and programmable bias current via external resistor. It operates across ±5V to ±15V supply differentials and supports ground-isolated logic interfacing in industrial control and legacy bus systems.
For engineers reviewing the LTC1045CJ datasheet, LTC1045CJ pinout, LTC1045CJ application, or LTC1045CJ equivalent, this device serves as a voltage-level-shifting solution for mixed-supply systems requiring noise-immune threshold detection, latch-controlled output hold, and low-quiescent-current operation down to 10nA in shutdown - critical for RS232 receivers, flat-ribbon cable drivers, and analog switch interfaces.
Technical Context
The LTC1045CJ integrates six linear CMOS comparators with individually accessible non-inverting inputs and shared trip-point references (VTRIP1 for IN1–IN4, VTRIP2 for IN5–IN6), internal hysteresis (7–20mV adjustable via RSET), and CMOS output latches controlled by the ISET pin. Its architecture enables precise threshold setting across a wide common-mode range (V– to V+ – 2V).
Power management is implemented through dual functionality of the ISET pin: connecting it to V+ shuts off all linear circuitry (IOFF ≤ 1µA) while preserving output state via powered CMOS logic, and biasing it to V– via external resistor sets supply current from 100µA to 4.5mA - directly trading speed (td = 1.2µs at 100µA) for power.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range (V+ to V–) | 4.5V to 15V differential - enables operation between disparate logic domains (e.g., 5V TTL and ±5V analog switches). |
| Input Voltage Range | V– – 0.3V to V+ + 18V - allows ±50V input tolerance with 100kΩ limiting resistor, supporting robust RS232 and relay-driver applications. |
| Output Drive Capability | VOH ≥ 2.4V @ –360µA, VOL ≤ 0.4V @ 1.6mA - sufficient to directly drive TTL loads and CD4016 analog switches without buffering. |
| Response Time | 1.2µs typical at 100µA supply current - configurable up to 350ns with higher bias, balancing speed vs. micropower operation. |
| Hysteresis | 7mV to 20mV (adjustable via RSET) - provides noise immunity against ground bounce or EMI in industrial cabling environments. |
| Shutdown Current | ≤ 1µA (IOFF) when ISET = V+ - enables zero-power hold mode for battery-backed or energy-harvesting systems. |
| Operating Temperature | –40°C to +85°C - qualified for extended industrial temperature range, matching C-grade specification of LTC1045CJ package. |
Pinout & Package
J Package: 20-lead hermetic CERDIP (0.300" wide), obsolete but still available; TJMAX = 150°C, θJA = 70°C/W; lead finish is solder dip/plate per drawing #05-08-1110.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1–IN6 (Pins 2–7) | Comparator non-inverting inputs | Accept logic or analog signals referenced to V–; support overvoltage tolerance up to ±50V with external current limiting. |
| VTRIP1 (Pin 9) | Common trip reference for comparators 1–4 | Settable from V– to V+ – 2V; defines switching threshold for first four channels in level translation or window detection. |
| VTRIP2 (Pin 8) | Common trip reference for comparators 5–6 | Independent threshold setting for last two channels - enables dual-window or asymmetric logic translation schemes. |
| V– (Pin 10), VOL (Pin 11) | Negative supply and output low rail | May be tied together or separated; VOL defines logic LOW level, V– powers comparator core - both must satisfy minimum differential vs. V+. |
| ISET (Pin 12) | Bias programming / shutdown / latch control | Three functions: (1) RSET to V– sets quiescent current, (2) forced to V+ disables comparators and latches outputs, (3) controls hysteresis magnitude. |
| DISABLE (Pin 13) | Three-state enable control | TTL-compatible input (VIH ≥ 2.0V); asserts Hi-Z on all six outputs - essential for bus sharing and multiplexed driver architectures. |
| OUT1–OUT6 (Pins 14–19) | CMOS latched three-state outputs | Drive TTL/CMOS loads directly; output impedance ROH/ROL varies with VOH/VOL selection - optimized for ±5V analog switch drive. |
| V+ (Pin 20), VOH (Pin 1) | Positive supply and output high rail | V+ powers comparator core; VOH defines logic HIGH level - must not exceed V+ due to internal parasitic diode D1. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable power/speed trade-off | External RSET resistor adjusts supply current from 100µA to 4.5mA, enabling response time tuning from 1.2µs to sub-350ns. |
| Complete power shutdown with output latch | ISET = V+ cuts comparator bias to ≤1µA while retaining output logic state - eliminates leakage paths in standby mode. |
| Ground isolation buffer capability | Supports logic translation between systems with ground potentials differing by up to 10V (within V+–V– ≤ 15V limit), verified in TA08 application. |
| ±50V input tolerance with external protection | Inputs withstand ±50V relative to V– when series-limited by 100kΩ resistor - validated for RS232 receiver and relay-driver use cases. |
| Internal hysteresis with bias-dependent adjustment | Hysteresis ranges 7–20mV depending on RSET value - improves noise margin in noisy industrial environments without external components. |
Applications
| RS232 Line Receiver | Flat Ribbon Cable Driver/Receiver |
|---|---|
|
Use Scenario: Converting ±3V to ±15V RS232 signal levels to 0V/5V TTL logic in legacy serial interfaces. IC Role / Device Role / Timing Role: Level translator and noise-immune receiver with built-in hysteresis and latch capability. Use Value: Eliminates need for discrete clamping diodes and pull-up resistors; supports direct connection to microcontroller UART pins. |
Use Scenario: Driving and receiving data across 66-ft flat ribbon cables in industrial PLC backplanes with adjacent conductor coupling. IC Role / Device Role / Timing Role: High-speed comparator-based driver/receiver with matched propagation delay and ground-isolation capability. Use Value: Maintains signal integrity over long parallel runs using differential-like referencing (VTRIP1/VTRIP2) and 150Ω Zo matching. |
| Analog Switch Driver (±5V) | Logic Ground Isolation Buffer |
|
Use Scenario: Controlling CD4016-type analog switches requiring ±5V gate drive from 5V TTL/CMOS logic sources. IC Role / Device Role / Timing Role: Voltage-level shifter translating 0V/5V logic to ±5V switch control signals with fast edge rates. Use Value: Enables direct drive of bilateral analog switches without external level-shifting transistors or charge pumps. |
Use Scenario: Interfacing TTL logic between two isolated subsystems (e.g., motor controller and sensor module) with separate ground references. IC Role / Device Role / Timing Role: Ground-isolated level translator maintaining logic thresholds referenced to local ground A or B. Use Value: Prevents ground-loop currents while preserving timing integrity - validated for ≤10V ground potential difference (TA08). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar hex level translator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3086CSA+ | RS485 transceiver with integrated failsafe, no comparator latch or programmable bias; fixed 5V supply only. | Designed for differential bus communication, not single-ended level translation or analog switch drive. | Select when replacing RS485 line drivers - not suitable for LTC1045CJ's mixed-supply translation or shutdown-latch functions. |
| SN74LVC1T45DBVR | Single-bit bidirectional level shifter; no hysteresis, no shutdown, no VTRIP configuration; max 5.5V VCC. | Targeted at low-voltage portable logic (1.65V–5.5V), lacks ±50V input tolerance and multi-threshold flexibility. | Choose for space-constrained, low-cost 1-bit translation where micropower shutdown and analog interface are unnecessary. |
Compared with MAX3086CSA+ and SN74LVC1T45DBVR, the LTC1045CJ uniquely combines six independent programmable comparators, ±50V input tolerance, output latching, and full shutdown - making it irreplaceable in legacy industrial systems requiring robust, configurable level translation across wide supply ranges.
Availability
LTC1045CJ is available at Aetrix Electronics and suitable for industrial control systems, legacy RS232 interfaces, analog switch driver circuits, and ground-isolated logic interconnects requiring stable component supply and long-term obsolescence mitigation.
Supply support for LTC1045CJ 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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for legacy Linear products including the LTC1045 family.
The LTC1045CJ belongs to Linear's precision analog interface IC product line, designed specifically for mixed-signal system integration where robust level translation, low-power operation, and flexible supply configurations are required in harsh industrial environments.
FAQ
What is the maximum allowable voltage differential between V+ and V– for the LTC1045CJ?
The LTC1045CJ specifies an absolute maximum V+ to V– differential of 18V, with a recommended operating limit of 15V. Exceeding 15V risks violating internal parasitic diode constraints and may cause latch-up or permanent damage. For reliable operation, maintain V+ – V– ≤ 15V under all conditions including power-up transients, as noted in datasheet Note 2 and Figure 5.
Can the LTC1045CJ drive CD4016 analog switches directly using ±5V supplies?
Yes, the LTC1045CJ can directly drive CD4016 analog switches with ±5V supplies. When configured with V+ = +5V, V– = –5V, VOH = +5V, and VOL = –5V, its outputs deliver sufficient voltage swing and current (ISOURCE ≥ 4mA, ISINK ≥ 7.5mA) to fully enhance/deplete CMOS transmission gates. Application TA06 explicitly validates this configuration.
How does the ISET pin function in shutdown mode for the LTC1045CJ?
When the ISET pin of the LTC1045CJ is driven to V+ – 0.5V or higher, it shuts off all comparator bias current (IOFF ≤ 1µA) and latches the current output states. The CMOS output stage remains powered, preserving logic levels indefinitely. This mode consumes near-zero static power while maintaining output integrity - ideal for battery-critical or fail-safe hold applications.
What is the purpose of separate VTRIP1 and VTRIP2 pins on the LTC1045CJ?
VTRIP1 (Pin 9) sets the common threshold for comparators IN1–IN4, while VTRIP2 (Pin 8) sets the threshold for IN5–IN6. This dual-reference architecture enables independent logic translation for two distinct signal groups - such as separating data and control lines, implementing window comparators, or adapting to asymmetric input voltage ranges in mixed-logic systems.
Is the LTC1045CJ pin-compatible with the obsolete LTC1045CN or LTC1045CSW packages?
No, the LTC1045CJ (20-lead CERDIP) is not pin-compatible with the LTC1045CN (PDIP) or LTC1045CSW (SO Wide) packages. While all share identical electrical functionality and pin numbering, the J-package has different mechanical dimensions, lead pitch, and hermetic sealing - requiring PCB redesign for replacement. The datasheet explicitly recommends the N-package as alternate source for new designs.
LTC1045CJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- 20-CDIP (0.300", 7.62mm)
LTC1045CJ FAQ
1.How can I place an order for LTC1045CJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1045CJ 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 LTC1045CJ reliable?
The price and inventory of LTC1045CJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1045CJ is usually 5 days.
3.What payment methods are accepted for LTC1045CJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1045CJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1045CJ?
LTC1045CJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1045CJ 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 LTC1045CJ?
For technical support, including LTC1045CJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1045CJ requirements.
6.How does Aetrix verify that LTC1045CJ is sourced from the original manufacturer or authorized distributors?
All LTC1045CJ 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 LTC1045CJ meets industry standards.
7.What is the process for return or replacement of LTC1045CJ?
All LTC1045CJ units undergo pre-shipment inspection (PSI). If there is an issue with LTC1045CJ, 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 LTC1045CJ part is unused and in its original packaging.
Return procedure for LTC1045CJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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