DS2129S Ver la hoja de datos (PDF) - Dallas Semiconductor -> Maxim Integrated
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DS2129S Datasheet PDF : 5 Pages
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LVD SCSI 27-Line Regulator
Pin Description
PIN
NAME
FUNCTION
1, 8, 9,
10, 15,
16
N.C. No Connection. Do not connect pins.
Termination Power. Connect to SCSI
2
TERMPWR TERMPWR line and decouple with a
4.7µF ceramic capacitor.
3
4
5, 11–14
REG2
GND
HS_GND
Regulator 2, 0.75V Output. Decouple
with a 4.7µF ceramic capacitor.
Signal Ground
Heat-Sink Ground. Internally
connected to the mounting pad.
Should be connected to ground.
6
REG1
Regulator 1, 1.75V Output. Decouple
with a 4.7µF ceramic capacitor.
7
DIFFSENSE DIFFSENSE Output. Drives the SCSI
bus DIFFSENSE line.
Detailed Description
The DS2129 provides three regulated outputs. The
REG1 provides a 1.75V output, and the REG2 provides
a 0.75V output. Both regulators can sink and source
200mA of current. These regulators are current-limited
to less than 700mA. The thermal-shutdown circuit dis-
ables the output buffers should the die temperature
exceed +150°C. With a pi network of resistors (475Ω,
121Ω, 475Ω) connected to these two outputs, the
DS2129 provides common-mode bias, differential bias,
and common impedance and differential impedance,
as required in a terminator specified in SPI-2 and SPI-3
standards for a SCSI system. The third regulator pro-
vides a 1.3V output for DIFFSENSE signaling.
Chip Information
TRANSISTOR COUNT: 3778 CMOS and 80 BIPOLAR
PROCESS: BiCMOS
SUBSTRATE CONNECTED TO GROUND
Thermal Information
Thermal Resistance (junction-to-ambient):
θJA = +77°C/W
Thermal Resistance (junction-to-case):
θJC = +25°C/W
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