ETC G219

G219
Global Mixed-mode Technology Inc.
Ultra320 Multi-mode LVD/SE SCSI Terminator
Features
General Description
„Auto-selectable multi-mode Single-Ended
The G219 Multi-mode LVD/SE SCSI terminator provides a smooth transition into the next generation of
the SCSI Parallel Interface (SPI-4). It automatically
senses the bus, via DIFFSENS, and switches the termination to either single-ended (SE) or low voltage
differential (LVD) SCSI, dependent on which type of
devices are connected to the bus. If the G219 detects
a HVD SCSI device, it switches to a high impedance
state. For a 16-bit Wide SCSI bus to be operational,
three G219 terminators are needed.
or LVD Termination
„Meets SCSI-1, SCSI-2, SCSI-3 SPI Ultra
(Fast-20), Ultra 2(SPI-2 LVD), Ultra160 (SPI-3
LVD), and Ultra320 (SPI-4 LVD) standards
„Supports active negation
„3pF channel capacitance
„2.9V to 5.5V operation
„Thermal protection
„Hot-Swap compatible
„5% tolerance on SE and LVD termination
resistance
„28 pin TSSOP package
„28 Pin TSSOP: Pin Compatible with DS2119
The Multi-mode terminator contains all functions required to terminate and auto detect and switch modes
for SCSI Parallel Interface (SPI) bus architectures. For
the SE termination, one regulator and nine precision
110ohm resistors are used. For the LVD termination,
the G219 integrates 18 regulated supplies with nine
precision resistor strings.
Applications
„Server and workstation
„High-end PC
„Industrial PC
„Disk Array (RAID)
„SCSI cable
Pin Configuration
G219
1
28
TPWR
R1+
2
27
R1-
3
26
TPWR
R9-
R2+
R2-
4
25
R9+
5
24
R8-
NC/ HS GND
R3+
6
23
R8+
7
22
NC/ HS GND
R3-
8
21
R7-
R4+
9
20
R7+
R4-
10
19
R6-
R5+
11
18
R6+
R5-
12
17
DIFFB
DISCNCT
13
16
DIFFSENSE
GND
14
15
M/S
VREF
28Pin TSSOP
Ver 1.2
Feb 08, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
1
Global Mixed-mode Technology Inc.
G219
Ordering Information
PART NUMBER
G219T-D3
G219R-D3
TEMP. RANGE
0ºC-70ºC
0ºC-70ºC
PIN-PACKAGE
TSSOP-28 pin / Tube
TSSOP-28 pin / Tape & Reel
Note:
DIFFSENSRefers to the SCSI bus signal.
DIFFSENSERefers to the G219 pin name and internal circuitry relating to differential sensing.
DIFFBRefers to the G219 pin name and internal circuitry relating to monitoring the DIFFSENS line.
Functional Description
pacitance and reflections which can degrade the bus
signals.
The G219 is used in multi-mode active termination
applications, where single ended (SE) and low voltage
differential (LVD) devices might coexist. The LVD termination section consists of 18 source/sink amplifiers
(VTOP, VBOT), biasing circuitry and nine precision
resistor strings (RTOP, RMID, RBOT). The SE termination section consists of a 2.85V source/sink regulator with 9 precision 110ohm resistor. The DIFFSENSE
section consists of a 1.3V, 5mA driver and a sensing
circuit (Figure 1)
The DIFFSENSE pin can drive the SCSI DIFFSENS
line (when M/S is pulled high) to determine the SCSI
bus operating mode. The G219 switches to the termination mode that is appropriate for the bus based on
the value of the DIFFSENS voltage. These modes are:
LVD mode LVD termination is provided by a precision
resistor string with two amplifiers. This configuration
yields a 105Ω differential and 150Ω common mode
impedance. A fail safe bias of 112mV is maintained
when no drivers are connected to the SCSI bus.
DIFFSENS is used to identify which types of SCSI
devices are present on the bus. If the voltage on
DIFFSENS is between 0-0.5V the bus is single-ended;
if it is between 0.7-1.9V the bus is LVD; and if it is
greater than 2.4V, the bus is HVD.
SE mode When the external driver for a given signal
line turns off, the active terminator will pull that signal
line to 2.85 volts (quiescent state). When used with an
active negation driver, the power amp can sink 22mA
per line while keeping the voltage reference in regulation. The terminating resistors maintain their 110Ω
value.
The G219 DIFFB pin monitors the DIFFSENS line to
determine the proper operating mode of the device.
HVD Isolation Mode The G219 identifies that there is
an HVD (high voltage differential) device on the SCSI
bus and isolates the termination pins from the bus.
To maintain the specified regulation, a 4.7µF capacitor
is required between the VREF pin and ground of each
G219. A high frequency cap (0.1µF ceramic recommended) can also be placed on the VREF pin in applications that use fast rise/fall time drivers. A typical
SCSI bus configuration is shown in Figure2.
When DISCNCT is pulled high, the termination pins
are isolated from the SCSI bus, and VREF is
grounded. During thermal shutdown, the termination
pins are isolated from the SCSI bus and VREF is
grounded. The DIFFSENSE driver is shut down during
either of these two events.
An internal pull down resistor assures that the G219
will be terminating the bus if the DISCNCT pin is left
floating.
To ensure proper operation, the TPWR pin should be
connected to the SCSI bus TERMPWR line. As with all
analog circuitry, the TERMPWR lines should be bypassed locally. A 2.2µF capacitor and a 0.01µF high
frequency capacitor is recommended between TPWR
and ground and placed as close as possible to the
G219. The G219 should be placed as close as possible to the SCSI connector to minimize signal and
power trace length, thereby resulting in less input ca-
DIFFSENS noise filtering
The G219 incorporates a internal digital filter to remove the noise signal on the DIFFSENS control line,
thereby eliminating erroneous switching between
modes. The external filter may be used in addition to
the internal digital filter.
Ver 1.2
Feb 08, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
2
G219
Global Mixed-mode Technology Inc.
Block Diagram
(Figure 1)
M/S DIFFSENSE
DISCNCT
THERMAL
SHUTDOWN
CIRCUITRY
DIFFSENSE
CIRCUITRY
CONTROL
LOGIC
DIFFB
VREF
VREF
R1-
110 Ohms
R9110 Ohms
REFERENCE
GENERATION
VTOP1
+
_
RTOP9
X9
RTOP1
R1-
R1R9R9-
RMID1
RMID9
R1+
R1+
R9+
R9+
RBOT1
RBOT9
+
_
VBOT1
X9
SE
GND
DRIVER
Ver 1.2
Feb 08, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
3
G219
Global Mixed-mode Technology Inc.
SCSI Bus Configuration (Figure 2)
CONTROL LINES (9)
TERMPWR
2.2µF
TERMPWR
TPWR
M/S
DISCNCT
TPWR
M/S
DISCNCT
G219
G219
DIFFSENS
DIFFSENSE
VREF
20K
20K
2.2µF
DIFFSENSE
DIFFB
VREF
DIFFB
0.1µF
0.1µF
4.7µF
4.7µF
DATA LINES (9)
TPWR
TPWR
M/S
M/S
DISCNCT
G219
DIFFB
DIFFB
VREF
4.7µF
4.7µF
2.2µF
2.2µF
DISCNCT
G219
VREF
2.2µF
DATA LINES (9)
TPWR
TPWR
M/S
M/S
DISCNCT
G219
VREF
2.2µF
DISCNCT
G219
DIFFB
DIFFB
VREF
4.7µF
4.7µF
Ver 1.2
Feb 08, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
4
G219
Global Mixed-mode Technology Inc.
Recommended Operating Conditions
PARAMETER
Termpower Voltage
SYMBOL
MIN
TYP
MAX
UNITS
Vtpwr(SE)
Vtpwr(LVD)
4.0
2.9
5
5
5.5
5.5
V
Vil
Vih
Tamb
-0.3
2.0
0
+0.8
Vtpwr+0.3
70
V
V
°C
Logic 0
Logic 1
Operating Temperature
Electrical Characteristics
Unless otherwise specified, these specifications apply over the operating ambient temperature range of
0°C≤
≤TA≤70°C.
PARAMETER
SYMBOL
CONDITION
MIN
Rdm
100
Rcm
Vdm
Vcm
All lines Open
110
100
1.125
104.5
2.79
110
2.85
LVD Terminator Section
Differential Mode Termination Resistance
Common Mode Termination Resistance
Differential Mode Bias
Common Mode Bias
Single Ended Terminator Section
Output Capacitance
SE Termination Resistance
SE Voltage Reference
SE output Current
Cout
Rse
Vref
Iose
Regulator Section
Line Regulation
Load Regulation
Current Limit
Sink Current
Note
Vline = 0-3.0 volts
TYP
MAX
UNITS
105
110
Ohms
150
112
1.25
190
125
1.375
Ohms
mV
V
3
115.5
2.93
25.4
pF
Ohms
Volts
mA
2.5
3.5
%
%
mA
Vline = 0.2 volts
LIREG
LOREG
ILIM
1.0
1.3
350
ISINK
200
mA
DC Section
SE mode (No Load)
LVD mode (No Load)
4
20
Termpower Current
Itpmr
Input Leakage High
Input Leakage Low
Iih
Iil
-1.0
DIFFSENS Section
DIFFSENS SE Operating Range
Vseor
DIFFSENS LVD Operating Range
DIFFSENS HVD Operating Range
DIFFSENSE Driver Output Voltage
DIFFSENSE Driver Source Current
Vlvdor
Vhvdor
Vdso
Idsh
M/S=1; Ids = 0-5mA
M/S = 1; Vdso=0V
Idsl
M/S=1; Vdso=2.75V
DIFFSENSE Driver Sink Current
mA
1.0
µA
µA
-0.3
0.5
V
0.7
2.4
1.2
1.9
Vtpwr+0.3
1.4
15
V
V
V
mA
200
µA
5
20
Note: Guaranteed by Design.
Ver 1.2
Feb 08, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
5
G219
Global Mixed-mode Technology Inc.
Typical Operating Characteristics
Common Mode Bias Vcm Temperature
Common Mode Bias Vcm - Vtpwr
1.375
1.375
T=80ºC
Vtpwr=5.8V
1.325
1.275
Vcm(V)
Vcm(V)
1.325
1.225
1.275
1.225
Vtpwr=2.8V
T=-10ºC
1.175
1.175
1.125
1.125
2.5
3.5
4.5
Vtpwr
-20
5.5
0.125
0.12
T=-10ºC
0.115
0.11
Vdm(V)
Vdm(V)
100
0.125
0.12
T=80ºC
0.115
0.11
0.105
0.105
0.1
0.1
2.5
3.5
4.5
Vtpwr
-20
5.5
Common Mode Termination Resistance
Rcm - Vtpwr @Temperature=24ºC
0
20
40
60
80
Temperature(ºC)
100
Common Mode Termination Resistance
Rcm - Temperature@Vtpwr=5V
190
190
180
180
170
170
Rcm(Ohm)
Rcm(Ohm)
20
40
60
80
Temperature(ºC)
Differential Mode Bias Vdm Temperature@Vtpwr=5V
Differential Mode Bias Vdm - Vtpwr
160
150
140
160
150
140
130
130
120
120
110
110
2.5
3.5
4.5
Vtpwr
5.5
-20
Differential Mode Termination
Resistance Rdm - Vtpwr
110
109
108
107
106
105
104
103
102
101
100
0
20
40
60
80
Temperature(ºC)
100
Differential Mode Termination
Resistance Rdm - Temperature
110
T=80ºC
Vtpwr=2.8V
108
Rdm(Ohm)
Rdm(Ohm)
0
T=-10ºC
106
104
Vtpwr=5.8V
102
100
2.5
3.5
4.5
Vtpwr
5.5
-20
Ver 1.2
Feb 08, 2002
0
20
40
60
80
Temperature(ºC)
100
TEL: 886-3-5788833
http://www.gmt.com.tw
6
G219
Global Mixed-mode Technology Inc.
SE Termination Resistance Rse Vtpwr @Vline=0V
SE Termination Resistance Rse Vtpwr @T=24ºC;Vline=0V
115
Rse(Ohm)
Rse(Ohm)
113
111
109
107
105
3.5
4.5
115
114
113
112
111
110
109
108
107
106
105
Vtpwr=3.8V
Vtpwr=5.8V
-20
5.5
0
20
40
60
80
100
Temperature(ºC)
Vtpwr
SE Termination Resistance Rse Vtpwr @Vtpwr=5V;T=24ºC
Vref - Ivref@Vtpwr=5V
2.93
115
2.91
113
Vref
Rse(Ohm)
2.89
111
109
T=80ºC
2.87
2.85
2.83
107
T=-10ºC
2.81
105
0
1
2
2.79
-250 -150 -50
3
2.93
2.91
2.89
2.87
2.87
Vref
2.89
2.85
2.85
2.81
2.81
2.79
2.79
0
20
40
Ivref=0mA
2.83
Vtpwr=3.8V
-20
Ivref=-200mA
2.91
Vtpwr=5.8V
2.83
150 250 350
Vref - Vtpwr@T=24ºC
Vref - Temperature@Ivref=0mA
2.93
Vref
50
Ivref(mA)
Vline
60
80
Ivref=360mA
3.5
100
Temperature(ºC)
4.5
5.5
Vtpwr
Ver 1.2
Feb 08, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
7
Global Mixed-mode Technology Inc.
G219
Pin Description
PIN
SYMBOL
1
VREF
2-5,7-12,
18-21, 23-26
Rx+, Rx-
6,22
13
14
15
DESCRIPTION
Reference Voltage. 2.85-volt reference in SE mode and 1.25V in LVD mode; must be connected to a
4.7µF capacitor.
Signal Termination. (X=1,2,3,…..9)
Rx+: Ground line for single-ended or positive line for differential applications for the SCSI bus.
Rx-: Signal line/active line for single-ended or negative line in differential applications for the SCSI
bus.
NC/ HS GND No Connect/Heat Sink Ground. Should be grounded for heat sinking purpose
DISCNCT Disconnect. When pulled high, the G219 isolates its bus pins (Rx+, Rx-) from the SCSI bus.
GND
Ground. Terminator ground pin. Connected to ground.
Master/slave. Used to select which terminator is the controlling device. M/S pin high enables the
M/S
DIFFSENSE driver.
16
17
27,28
DIFFSENSE Output to drive the SCSI bus DIFFSENS line.
DIFFB pin should be connected to a 0.1µF capacitor to GND and 20k resistor to SCSI/Bus
DIFFB
DIFFSENS line. An input pin to detect the type of device (differential or single-ended) on the SCSI
bus.
TPWR
Terminator Power. Connect to the SCSI TERMPWR line and de-couple with a 2.2µF capacitor.
Ver 1.2
Feb 08, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
8
G219
Global Mixed-mode Technology Inc.
Package Information
C
D
28
L
E1
E
1
θ
A
A2
A1
e
b
Note:
1. Package body sizes exclude mold flash protrusions or gate burrs
2. Tolerance ±0.1mm unless otherwise specified
3. Coplanarity : 0.1mm
4. Controlling dimension is in millimeter. Converted inch dimensions are not necessarily accurate.
5. Follow JEDEC MO-153
MIN.
DIMENSION IN MM
NOM.
MAX.
MIN.
DIMENSION IN INCH
NOM.
A
A1
A2
----0.05
0.80
--------1.00
1.20
0.15
1.05
----0.002
0.031
--------0.039
0.048
0.006
0.041
b
C
D
E
0.19
0.09
9.60
-----
--------9.70
6.40
0.30
0.20
9.80
-----
0.007
0.004
0.378
-----
--------0.382
0.252
0.012
0.008
0.386
-----
E1
e
L
y
θ
4.30
----0.45
-----
4.40
0.65
0.60
-----
4.50
----0.75
0.10
0.169
----0.018
-----
0.173
0.026
0.024
-----
0.177
----0.030
0.004
0º
-----
8º
0º
-----
8º
SYMBOL
MAX.
Taping Specification
Feed Direction
Typical TSSOP Package Orientation
Ver 1.2
Feb 08, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
9