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PDF BH6626FS Data sheet ( Hoja de datos )
| Número de pieza | BH6626FS | |
| Descripción | Read /Write amplifier for FDD | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Magnetic disk ICs
Read / Write amplifier for FDD
BH6626FS
The BH6626FS is a read / write IC designed for floppy disk drives and has an internal active filter for memory systems
in which saddle margins are important. Any of multiple write current settings can be selected, and both density switching
and inner track / outer track switching are done internally.
FApplications
Floppy disc drives (1MB and 2MB)
FFeatures
1) Active filter switched internally.
2) Time domain filter with internal switch set according
to transfer rate.
3) Density switching and inner track / outer track
switching are done internally.
FAbsolute maximum ratings (unless otherwise noted, Ta = 25_C)
FRecommended operating conditions
522
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Magnetic disk ICs
BH6626FS
526
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Magnetic disk ICs
FMeasurement circuit
BH6626FS
FCircuit operation
(1) Read
The input signal from the head coils from each side of the
disc is amplified by the preamplifier and then differen-
tiated. The filter time constant can be set externally. After
differentiation, the differential output is input to the
comparator. The time domain filter detects zero cross,
and the output is converted to read data. The monostable
multivibrator width can be set externally, while the read
data pulse width is a constant 400ns.
(2) Write
Input write data are converted to toggle movements by
the internal flip-flops, operating the write driver. The write
driver current is supplied by the write current generator,
but the externally set current can be controlled according
to density and by selecting inner track/ outer track.
(3) Erase
An open collector output pin is used, and the erase cur-
rent is set with a resistor between it and the head.
(4) Power supply
When the low level voltage detector detects a drop in the
supply voltage, writing and erasing are prohibited.
532
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet BH6626FS.PDF ] | |
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