ROHM BD8919FV Data Manual
Summary
This advanced IC Card Interface solution is essential for connecting 5V smart cards to host controllers. It functions as a highly reliable bidirectional signal buffer, providing necessary power supply (VCC) while offering robust protection against ESD ($\ge \pm 6000$V), short circuits, and over-current events. The integrated manual details key features, including automated activation/deactivation sequences and programmable clock division ratios. Ideal for designers working on CLASS A or B-CAS card applications, this chip ensures stable and secure communication between the card and system electronics.
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IC Card Interface ICs
IC Card Interface ICs with Built-in Low Noise LDO Regulator
BD8918F,BD8918FV,BD8919F,BD8919FV No.09056EDT01
●Overview This is an interface IC for a 5V smart card. It works as a bidirectional signal buffer between a smart card and a controller. Also, it supplies 5V power to a smart card. With an electrostatic breakdown voltage of more than HBM; ±6000V, it protects the card contact pins.
●Features 1) 1 half duplex bidirectional buffers 2) Protection against short-circuit for all the card contact pins 3) 5V power source for the card (VCC) 4) Over-current protection for card power source 5) Built-in thermal shutdown circuit 6) Built-in supply voltage detector 7) Automatic activation/deactivation sequence function for card contact pin Activation sequence: driven by a signal from controller (CMDVCCB) Deactivation sequence: driven by a signal from controller (CMDVCCB) and fault detection (card removal, short
circuit of card power, IC overheat detection, VDD or VDDP drop) 8) Card contact pin ESD voltage ≧ ±6000V 9) Recommend frequency of crystal oscillator: 8MHz (BD8918F/FV), 16MHz (BD8919F/FV) 10) Programmable for card clock division of output signal: 1/1 and 1/2(BD8918F/FV), 1/2 and 1/4(BD8919F/FV). 11) RST output control by RSTIN input signal (positive output) 12) One multiplexed card status output by OFFB signal
●Applications Interface for CLASS A smart cards Interface for B-CAS cards
●Line up matrix
Card clock
Part No
Ratio of dividing frequency Package
BD8918F SOP16
BD8918FV SSOP-B16 BD8919F SOP16
BD8919FV SSOP-B16
www.rohm.com 2010.4 - Rev.D
© 2009 ROHM Co., Ltd. All rights reserved.
Page Summary Contents For ROHM BD8919FV Data Manual
Manual Details
| Brand | ROHM |
|---|---|
| Pages | 16 |
| File Size | 373.54 KB |
| Published | May 31, 2026 |
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Frequently Asked Questions
What is the primary function of this interface IC?
It acts as a bidirectional signal buffer and supplies 5V power to a smart card for CLASS A or B-CAS applications.
How does the IC protect the smart card?
It protects against short circuits, has built-in thermal shutdown, and features ESD protection up to ±6000V on the contact pins.
What voltage ranges are used for VDD and VDDP input?
VDD Input Voltage operates between -0.3 V and 6.5 V, while VDDP Input Voltage also uses a range of -0.3 V to 6.5 V.
Can the clock output frequency be customized?
Yes, the BD8918F/FV can divide the signal by 1/1 or 1/2, and the BD8919F/FV can select 1/2 or 1/4 division ratios.