Features: Operates at Non-Return to Zero (NRZ) data rates up to 25 Mbits/secondSingle a5V power supply operationLow Power dissipationÐ110 mW at 25 Mbits/sec NRZ rateTTL compatible inputs and outputsSupports write data precompensation with Early, Late and Level (PCOMP3T) output signalsPower Dow...
DP849001: Features: Operates at Non-Return to Zero (NRZ) data rates up to 25 Mbits/secondSingle a5V power supply operationLow Power dissipationÐ110 mW at 25 Mbits/sec NRZ rateTTL compatible inputs and out...
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The DP84900 is designed to perform the encoding and decoding for disk memory systems. DP849001 is designed to interface directly with National Semiconductor's integrated read channel circuits such as the DP8492. This Encoder/ Decoder (ENDEC) circuit decoding employs a 2/3 (1,7) Run Length Limited (RLL) code type and supports hard sectored format. The decoding also includes write data precompensation circuitry which detects the need for precompensation. This circuitry issues early, late and level (PCOMP3T) output signals necessary for two levels of precompensation. Precompensation information is generated against both the 2T and 3T patterns. The precompensation circuitry can be bypassed by the setting of a bit in the control register.
A control register is included to configure the ENDEC and to select several device operation options such as output code inversion and TRI-STATEÉ of the NRZ output.
The DP84900 is available in a 20-pin SO and SSO package.