Overview
The ST8024LTR is a smart card interface integrated circuit designed by STMicroelectronics. It serves as a complete low-cost analog interface for asynchronous Class A, B, and C smartcards. This device can be placed between the smart card and the microcontroller, requiring few external components to perform all necessary supply protection and control functions. The ST8024LTR is RoHS compliant and supports a wide range of smart card standards, including ISO 7816, GSM11.11, and EMV 4.2.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Supply Voltage (VDD, VDDP) | 2.7 | 6.5 | V | |
| Operating Temperature | -25.0 | 85.0 | °C | |
| Card Supply Current (ICC) at VCC = 5 V | 80 | mA | ||
| Card Supply Current (ICC) at VCC = 3 V | 65 | mA | ||
| Card Supply Current (ICC) at VCC = 1.8 V | 45 | mA | ||
| Package Type | TSSOP-20 | |||
| Packing Type | Tape and Reel | |||
| RoHS Compliance | Yes |
Key Features
- Supports 2.7 V to 6.5 V input voltage range
- Compatible with ISO 7816, GSM11.11, and EMV 4.2 smart card standards
- Three specifically protected half-duplex bi-directional buffered I/O lines to card contacts C4, C7, and C8
- Step-up converter for VCC generation separately powered by a 5 V ± 20% supply (VDDP and PGND)
- Regulated card supply voltage (VCC) with options for 1.8 V, 3 V, or 5 V ± 5%
- Handles current spikes of 40 nA up to 20 MHz and controls rise and fall times
- Filtered overload detection at ~120 mA
- Thermal and short-circuit protection on all card contacts
- Automatic activation and deactivation sequences initiated by software or hardware
- Enhanced ESD protection on card side (>6 kV)
- 26 MHz integrated crystal oscillator
- Built-in debounce on card presence contacts
- One multiplexed status signal OFF
- Non-inverted control of RST via pin RSTIN
- Clock generation for cards up to 20 MHz with synchronous frequency changes
- Supply supervisor for spike-killing during power-on and power-off and power-on reset
Applications
- Smartcard readers for set-top boxes
- IC card readers for banking
- Identification and pay TV systems
- Security access and telecommunications
Q & A
- What is the ST8024LTR used for?
The ST8024LTR is used as a smart card interface integrated circuit for asynchronous Class A, B, and C smartcards.
- What are the supported voltage ranges for the ST8024LTR?
The ST8024LTR supports a supply voltage range of 2.7 V to 6.5 V.
- What types of smart card standards is the ST8024LTR compatible with?
The ST8024LTR is compatible with ISO 7816, GSM11.11, and EMV 4.2 smart card standards.
- What kind of protection does the ST8024LTR offer?
The ST8024LTR offers thermal and short-circuit protection on all card contacts, as well as enhanced ESD protection on the card side.
- How is the card supply voltage regulated in the ST8024LTR?
The card supply voltage (VCC) is regulated with options for 1.8 V, 3 V, or 5 V ± 5%, and it handles current spikes and controls rise and fall times.
- What is the package type of the ST8024LTR?
The ST8024LTR comes in a TSSOP-20 package.
- Is the ST8024LTR RoHS compliant?
Yes, the ST8024LTR is RoHS compliant.
- What are some common applications of the ST8024LTR?
Common applications include smartcard readers for set-top boxes, IC card readers for banking, identification, pay TV, security access, and telecommunications.
- How does the ST8024LTR manage clock generation for smartcards?
The ST8024LTR generates clock signals for cards up to 20 MHz with synchronous frequency changes, divided by 1, 2, 4, or 8 through CLKDIV1 and CLKDIV2 signals.
- What kind of ESD protection does the ST8024LTR provide?
The ST8024LTR provides enhanced ESD protection on the card side, exceeding 6 kV.
