MagTek TTL - Manual (Page 27)

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APPENDIX B. READ IC 21006516 SPEC SHEET
21006516 SMD (SOIC)
Magnetic Stripe
F/2F Read/Decode
Integrated Circuit
General Information
The F/2F Read/Decode Integrated Circuit in intended for use in recovering F/2F encoded data received from a
magnetic head.
Features
• 150 to more than 12,000 F/2F bits per second.*
• Low power: Full operation from 2.7 to 5.5 volts. Current below 2.0 mA.
• Recovers Data with as much as 30% dropout of amplitude.*
• Accepts amplitudes from below 20% of ISO reference voltage to more than 250% of ISO reference voltage.*
• Meets or exceeds the requirement for:
IEC 1000-4-2 ESD (Electro Static Discharge)
IEC 1000-4-3 Radiated EMC Field (2x requirement)
IEC 1000-4-4 Electrical Fast Transient Burst requirement (transmissions on I/O cable)
* When used with MagTek read heads and recommended circuit.
Functional Block Diagram
Functional Description
The F/2F Read/Decode I.C. will recover clock and data signals from an F/2F data stream generated from a magnetic
head. The I.C. will function for data rates from 150 to more than 12,000 bits per second. Acquisition and tracking of
the data within this range is automatic. The F/2F Read/Decode I.C. is composed of three functional sections:
• Signal Conditioning and Detection
• Bit
Recovery
• Enable/Disable
Counters
The signal conditioning and detection section amplifies and filters the signal from the magnetic head, rejects common
mode noise, and detects the signal peaks. Other features include protection against certain waveform distortions that
may be present in the signal.
The enable/disable counters provide initialization for the recovery section. These counters initialize both the bit
recovery and the signal conditioning and detection sections.
The Bit Recovery section locks onto the data rate and performs the recovery of individual bits from the F/2F data
stream.