Rainbow Electronics DS2127 - Manual (Page 2)

DS2127
Ultra3 LVD/SE SCSI 14-Line Terminator
2 _____________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(TPWR = V TPWR(MIN) to V TPWR(MAX) , T A = 0°C to +70°C, unless otherwise noted.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Voltage Range on All Pins Relative to Ground ......-0.3V to +6.0V
V
REF Continuous Output Current....................................±200mA
Operating Temperature Range...............................0°C to +70°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +160°C
Soldering Temperature .......................................See IPC/JEDEC
J-STD-020A Specification
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
LVD 2.7 3.3 5.5 TPWR Operating Supply Range
(Note 1)
V TPWR
SE 4 5.0 5.5
V
TPWR SUPPLY CURRENT
I TPWR_LVD LVD SCSI mode 32
I TPWR_SE SE SCSI mode 10
mA TPWR Supply Current (All Lines
Open)
I
TPWR_ISO
ISO mode (terminators disabled) 750 µA
LVD TERMINATION (Applies to each line pair, 1 to 14 in LVD mode)
Differential-Mode Termination
Resistance
R DM 100 110 Ω
Common-Mode Termination
Resistance
R CM
R P and R N shorted together
(V CM(MAX) = 2V, V CM(MIN) = 0.5V)
110 165 Ω
Differential-Mode Bias V DM All lines open 100 125 mV
Common-Mode Bias V CM R P and R N shorted together (Note 1) 1.15 1.25 1.35 V
SE TERMINATION (Applies to single-ended terminators, 1 to 14 in SE mode)
Single-Ended Mode Termination
Resistance
R SE
R SE = (V LX - 0.2) / I LX , where V LX = voltage
at terminator pin with pin unloaded and
I
LX = current for each terminator pin with
the pin forced to 0.2V
104.5 110 115.5 Ω
Signal level at 0.2V, all lines low -21 -24 -25.4
Termination Current I SE
Signal level at 0.5V -18 -22.4
mA
SE Voltage Reference V REF 2.7 2.85 3.0 V
Pin Leakage With ISO high 400 nA
Single-Ended GND Resistance R
GND
Measured at R
P
pins, I = 10mA 20 60 Ω
TERMINATOR PIN CAPACITANCE
Terminator Pin Capacitance C IN With ISO high (Note 2) 3 pF
V REF REGULATOR
1.25V Regulator Output Voltage V REF_LVD
0.5V ≤ V
CM
≤ 2.0V, V
CM applied to all R P
and R N lines simultaneously
1.15 1.25 1.35 V
1.25V Regulator Short-Circuit
Source Current
I SOURCE V REF = 0V -375 -700 -1000 mA
1.25V Regulator Short-Circuit
Sink Current
I SINK V REF = 3.3V 170 300 700 mA