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Analog Devices Inc. LTC1756EGN#TRPBF
- Part No.:
- LTC1756EGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Specialized
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1756EGN#TRPBF.pdf
- Description:
- IC INTERFACE SPECIALIZED 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,378
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Product details
Overview
LTC1756EGN#TRPBF from Analog Devices (formerly Linear Technology) is a fully ISO/IEC 7816-3 and EMV-compliant smart card interface IC designed to bridge host microcontrollers and contact-based smart cards. It integrates a buck-boost charge pump delivering regulated 3V or 5V VCC output, dynamic pull-up current sources for fast I/O rise times, and >10kV HBM ESD protection on all smart card pins. It operates from 2.7V to 5.5V input, draws only 75µA typical operating current, and supports handheld payment terminals and ATMs.
For engineers reviewing the LTC1756EGN#TRPBF datasheet, LTC1756EGN#TRPBF pinout, LTC1756EGN#TRPBF application, or LTC1756EGN#TRPBF equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior, confirmed ESD robustness, and validated alternative options - all specific to the LTC1756EGN#TRPBF 16-pin SSOP variant.
Technical Context
The LTC1756EGN#TRPBF implements a capacitive charge pump architecture with internal C+ and C– flying capacitor terminals, enabling regulated 3V/5V output without inductors. Its bidirectional I/O channel uses dynamic edge-rate detection to activate high-current pull-ups only during signal transitions, achieving sub-0.5µs rise/fall times while maintaining ultra-low 75µA quiescent current.
It features integrated level-shifting between DVCC-referenced controller logic (DVCC internally tied to VIN) and VCC-referenced smart card signals, with fault monitoring on CLK and RST via CIN/RIN comparison and VCC underrange detection (5µs minimum). The READY pin serves dual roles: indicating VCC stabilization and signaling alarm state entry upon overtemperature, short-circuit, or invalid CLK/RST levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.7V to 5.5V - enables direct battery connection without external regulation |
| VCC Output Options | 3.00V ±0.20V or 5.00V ±0.25V - selectable via 5V/3V pin, latched on PWR falling edge |
| Operating Current | 75µA typical - minimizes power draw in portable smart card readers |
| Shutdown Current | 2.5µA at VIN ≤3.6V - ensures multi-year battery life in keychain readers |
| ESD Protection | >10kV HBM on CLK, RST, I/O, VCC, GND - eliminates need for external TVS diodes |
| CLK Frequency Support | Up to 5MHz - meets EMV clock duty cycle and timing requirements |
| Ready Assertion Delay | 2.7–12ms after PWR low - provides controlled soft-start to prevent inrush into smart card |
Pinout & Package
Package: 16-lead narrow plastic SSOP (GN), 5.3mm × 6.2mm, 0.635mm pitch, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PRES (1) | Smart card presence detector input | Internally pulled up; detects grounded NO switch; debounced ≥40ms to prevent false insertion |
| PWR (2) | Power enable control | Active-low; falling edge latches 5V/3V setting and initiates charge pump activation |
| GND (3) | Ground reference | Low-impedance return path for VIN bypass, VCC storage, and ESD current dissipation |
| VIN (4) | Main supply input | 2.7V–5.5V source for charge pump; requires 10µF low-ESR ceramic bypass to GND |
| VCC (5) | Regulated smart card supply output | 3V or 5V output; short-circuit protected; rapidly discharged during deactivation per ISO 7816 |
| I/O (6) | Bidirectional data interface | Level-shifted; dynamic pull-up enables fast rise time; becomes active only after READY goes low |
| RST (7) | Smart card reset output | Level-shifted; low-impedance during Idle; fault-monitored against RIN; max 5MHz toggle rate |
| CLK (8) | Smart card clock output | Level-shifted; optimized for EMV duty cycle; fault-monitored against CIN; 16ns rise/fall time |
| C– (9) | Flying capacitor negative terminal | Connects to 0.68µF X7R ceramic flying cap; sets debounce time and charge pump efficiency |
| C+ (10) | Flying capacitor positive terminal | Paired with C–; switching node for charge pump; requires low-ESR ceramic capacitor |
| DATA (11) | Controller-side bidirectional data | Open-drain compatible; sinks 250µA when pulled low; high-impedance during Idle or before READY |
| RIN (12) | Controller reset input | Level-shifted to RST; DVCC-referenced (DVCC = VIN); fault-checked against RST output |
| CIN (13) | Controller clock input | Level-shifted to CLK; DVCC-referenced (DVCC = VIN); fault-checked against CLK output |
| READY (14) | System readiness & alarm indicator | Open-drain output; low = VCC stable and ready; high = Alarm state or inactive |
| CARD (15) | Debounced card presence output | Open-drain; asserts low ≥40ms after valid PRES; releases within 50µs of card removal |
| 5V/3V (16) | VCC output voltage select | Logic input referenced to VIN; high = 5V, low = 3V; latched on PWR falling edge |
Key Features
| Feature | Design Value |
|---|---|
| ISO/IEC 7816-3 & EMV compliance | Fully satisfies contact smart card electrical, timing, and deactivation requirements out-of-the-box |
| Integrated buck-boost charge pump | Eliminates external inductor; supports single-supply operation across 2.7–5.5V battery range |
| Dynamic pull-up current sources | Reduces average IDD to 75µA while achieving <0.5µs rise time on I/O, DATA, CLK, RST |
| On-chip level translation | Bi-directional voltage translation between VIN-referenced controller and VCC-referenced card |
| Comprehensive fault protection | Detects VCC underrange (5µs), CLK/RST invalid levels, overtemperature, and card removal |
| Wired-OR READY/CARD outputs | Enables multicard systems using single microcontroller GPIO with no external logic |
Applications
| Handheld Payment Terminals | ATMs |
|---|---|
|
Use Scenario: Battery-powered point-of-sale device inserting/removing EMV chip cards in field environments. IC Role / Device Role / Timing Role: Smart card interface IC managing VCC sequencing, level translation, ESD-safe I/O, and fault-aware READY signaling. Use Value: 75µA operating current extends battery life; >10kV ESD withstand eliminates external protection; 40ms PRES debounce prevents false card detect in vibration-prone enclosures. |
Use Scenario: Fixed-location financial kiosk requiring reliable smart card acceptance under continuous operation. IC Role / Device Role / Timing Role: Primary smart card interface handling CLK/RST/I/O timing, VCC regulation, and alarm reporting for system-level fault recovery. Use Value: 5MHz CLK support meets EMV timing specs; short-circuit protected VCC output prevents damage during card insertion errors; READY pin enables automatic retry on transient faults. |
| Pay Telephones | Key Chain Readers |
|
Use Scenario: Public-access coin/card phone accepting prepaid smart cards in uncontrolled ambient conditions. IC Role / Device Role / Timing Role: Robust interface IC providing ESD-hardened I/O, temperature-stable VCC regulation, and fail-safe deactivation. Use Value: 10kV HBM ESD rating survives repeated human contact; –40°C to +85°C operation ensures reliability in outdoor cabinets; rapid VCC discharge complies with ISO 7816 deactivation timing. |
Use Scenario: Ultra-compact USB or Bluetooth-connected reader worn on keychain, powered by coin cell. IC Role / Device Role / Timing Role: Low-power smart card interface enabling wake-on-insert, minimal standby drain, and fast card enumeration. Use Value: 2.5µA shutdown current enables multi-year shelf life; 16-pin SSOP footprint fits sub-15mm PCB area; PRES/CARD debounce prevents false wake from mechanical shock. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar smart card interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1755EGN#TRPBF | 24-pin SSOP; includes AUX1/AUX2, CS, ALARM, NC/NO, and DVCC pins; supports multicard parallel operation | Required where auxiliary I/O channels, independent DVCC supply, or wired-OR ALARM signaling are needed | Select LTC1755EGN#TRPBF when design requires extra I/O flexibility, separate logic supply, or fault isolation across multiple cards |
| MAX3232ESE+ | RS-232 transceiver; no charge pump, no smart card protocol logic, no READY/ALARM, no ESD rating >15kV | Only suitable as level shifter in non-EMV/non-ISO systems with external 3V/5V supplies and discrete control logic | Not a functional replacement; use only if full smart card interface functionality is implemented externally |
Compared with LTC1755EGN#TRPBF, the LTC1756EGN#TRPBF reduces pin count and removes auxiliary I/O and ALARM, simplifying layout for single-card applications; compared with MAX3232ESE+, it delivers complete, standards-compliant smart card power, signaling, and fault management in one IC - eliminating 7+ discrete components and PCB area.
Availability
LTC1756EGN#TRPBF is available at Aetrix Electronics and suitable for handheld payment terminals, ATMs, and key chain readers requiring stable component supply, long-term lifecycle assurance, and guaranteed RoHS-compliant manufacturing.
Supply support for LTC1756EGN#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC1756EGN#TRPBF belongs to the Linear Technology Smart Card Interface product line, engineered specifically for compact, low-power, standards-compliant contact smart card readers in payment, identification, and secure access systems.
FAQ
What is the maximum input voltage the LTC1756EGN#TRPBF can accept?
The LTC1756EGN#TRPBF supports an absolute maximum VIN of 6.0V, but its specified operating range is 2.7V to 5.5V. Exceeding 5.5V may cause undefined behavior or damage. The device includes overvoltage protection on VIN, but sustained operation above 5.5V voids parametric guarantees and risks latch-up. Always maintain VIN within 2.7V–5.5V for full compliance with ISO 7816-3 and EMV specifications in the LTC1756EGN#TRPBF.
Does the LTC1756EGN#TRPBF require external components for ESD protection?
No, the LTC1756EGN#TRPBF does not require external ESD protection components on smart card pins (CLK, RST, I/O, VCC, GND), as all are rated for >10kV HBM per JEDEC JS-001. However, proper PCB layout is mandatory: the GND pin must connect directly to a solid ground plane, and the 10µF VCC storage capacitor must be placed adjacent to the VCC and GND pins to absorb ESD current. External TVS diodes are unnecessary and may degrade signal integrity in the LTC1756EGN#TRPBF.
How does the LTC1756EGN#TRPBF handle smart card deactivation per ISO 7816?
The LTC1756EGN#TRPBF automatically discharges VCC to <0.4V within 100–250µs when entering the Idle state, meeting ISO 7816-3 deactivation timing. This occurs on PWR high assertion or fault-induced Alarm entry. The discharge path is internal and controlled, ensuring no residual voltage remains on the smart card VCC contact. No external circuitry is needed - the LTC1756EGN#TRPBF handles full deactivation autonomously.
Can the LTC1756EGN#TRPBF support both 3V and 5V smart cards in the same design?
Yes, the LTC1756EGN#TRPBF supports both 3V and 5V smart cards via the 5V/3V pin: logic high selects 5.00V ±0.25V output, logic low selects 3.00V ±0.20V output. The selection is latched on the falling edge of PWR, so voltage switching requires returning to Idle state first. Both outputs meet EMV voltage tolerance and load regulation specs - the LTC1756EGN#TRPBF delivers true dual-voltage compatibility without hardware changes.
What is the function of the READY pin on the LTC1756EGN#TRPBF?
The READY pin on the LTC1756EGN#TRPBF is an open-drain output that serves two critical functions: it goes low to indicate VCC has stabilized at its target voltage (3V or 5V), enabling safe communication; and it goes high to signal entry into Alarm state due to VCC underrange, overtemperature, CLK/RST fault, or card removal. It supports wired-OR connection for multicard systems - a single microcontroller GPIO can monitor multiple LTC1756EGN#TRPBF devices.
LTC1756EGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Smart Card
- Interface:
- -
- Voltage - Supply:
- 2.7V ~ 6V
- Supplier Device Package:
- 16-SSOP
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
LTC1756EGN#TRPBF FAQ
1.How can I place an order for LTC1756EGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1756EGN#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 LTC1756EGN#TRPBF reliable?
The price and inventory of LTC1756EGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1756EGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1756EGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1756EGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1756EGN#TRPBF?
LTC1756EGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1756EGN#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 LTC1756EGN#TRPBF?
For technical support, including LTC1756EGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1756EGN#TRPBF requirements.
6.How does Aetrix verify that LTC1756EGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1756EGN#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 LTC1756EGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1756EGN#TRPBF?
All LTC1756EGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1756EGN#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 LTC1756EGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC1756EGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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