参数资料
型号: DS2129S+T&R
厂商: Maxim Integrated Products
文件页数: 4/5页
文件大小: 0K
描述: IC REGULATOR SCSI 16-SOIC
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 2,500
应用: 低压差分(LVD)SCSI,SPI-2,SPI-3
输入电压: 2.7 V ~ 5.25 V
输出数: 3
输出电压: 1.3V,0.75V,1.75V
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 16-SOIC(0.154",3.90mm 宽)
供应商设备封装: 16-SOIC
包装: 带卷 (TR)
LVD SCSI 27-Line Regulator
Pin Description
Chip Information
TRANSISTOR COUNT: 3778 CMOS and 80 BIPOLAR
PIN
1, 8, 9,
10, 15,
NAME
N.C.
FUNCTION
No Connection. Do not connect pins.
PROCESS: BiCMOS
SUBSTRATE CONNECTED TO GROUND
Thermal Information
16
Termination Power. Connect to SCSI
Thermal Resistance (junction-to-ambient):
θ JA = +77°C/W
2
3
4
TERMPWR
REG2
GND
TERMPWR line and decouple with a
4.7μF ceramic capacitor.
Regulator 2, 0.75V Output. Decouple
with a 4.7μF ceramic capacitor.
Signal Ground
Thermal Resistance (junction-to-case):
θ JC = +25°C/W
Heat-Sink Ground. Internally
5, 11–14
6
7
HS_GND
REG1
DIFFSENSE
connected to the mounting pad.
Should be connected to ground.
Regulator 1, 1.75V Output. Decouple
with a 4.7μF ceramic capacitor.
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 (475 Ω ,
121 Ω , 475 Ω ) 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.
4
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