ST8024CTR STMicroelectronics

ST8024 Smartcard interface Features Designed to be compatible with the NDS conditional access system IC card interface 3 or 5 V supply for the IC (V and GND) DD Three specifically protected half-duplex bi- SO-28 TSSOP28 directional buffered I/O lines to card contacts C4, C7 and C8 DC-DC converter for V generation CC separately powered from a 5 V 20% supply ISO 7816, GSM11.11 and EMV (payment (V and PGND) systems) compatibility DDP 3 or 5 V 5 % regulated card supply voltage Supply supervisor for spike-killing during (V ) with appropriate decoupling has the power-on and power-off and power-on reset CC following capabilities: (threshold fixed internally or externally by a resistor bridge) I < 80 mA at V = 4 to 6.5 V CC DDP Handles current spikes of 40 nA up to 20 Built-in debounce on card presence contacts MHz One multiplexed status signal off Controls rise and fall times Filtered overload detection at Description approximately 120 mA The ST8024 is a complete low cost analog Thermal and short-circuit protection on all card interface for asynchronous 3 V and 5 V smart contacts cards. It can be placed between the card and the Automatic activation and deactivation microcontroller with few external components to sequences initiated by software or by perform all supply protection and control hardware in the event of a short-circuit, card functions. ST8024 is a direct replacement of take-off, overheating, V or V drop-out DD DDP ST8004. Enhanced ESD protection on card side (> 6 kV) Main applications are: smartcard readers for set- 26 MHz integrated crystal oscillator top-box, IC card readers for banking, identification, pay TV. Clock generation for cards up to 20 MHz (divided by 1, 2, 4 or 8 through CLKDIV1 and CLKDIV2 signals) with synchronous frequency changes Non-inverted control of RST via pin RSTIN Table 1. Device summary Order codes Temperature range Packages Packaging ST8024CDR - 25 to 85 C SO-28 (tape and reel) 1000 parts per reel ST8024CTR - 25 to 85 C TSSOP28 (tape and reel) 2500 parts per reel March 2009 Rev 8 1/31 www.st.com 31Contents ST8024 Contents 1 Diagram . 5 2 Pin configuration 6 3 Maximum ratings 8 4 Electrical characteristics . 9 5 Functional description 16 5.1 Power supply 16 5.2 Voltage supervisor 16 5.2.1 Without external divider on pin PORADJ 16 5.2.2 With an external divider on pin PORADJ 17 5.2.3 Application examples . 17 5.3 Clock circuitry 17 5.4 I/O transceivers 18 5.5 Inactive mode 19 5.6 Activation sequence . 19 5.7 Active mode . 21 5.8 Deactivation sequence . 21 5.9 V generator . 21 CC 5.10 Fault detection . 22 6 Application 24 7 Package mechanical data 25 8 Revision history . 30 2/31