VSC850-QG [VITESSE]
Crossbar Switch, 16-Bit, CMOS, PQFP208, HEAT SINK, PLASTIC, QFP-208;
| 型号： | VSC850-QG |
| 厂家： | 
VITESSE SEMICONDUCTOR CORPORATION |
| 描述： | Crossbar Switch, 16-Bit, CMOS, PQFP208, HEAT SINK, PLASTIC, QFP-208 外围集成电路 |
| 文件： | 总16页 (文件大小：245K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
1.6 Gb/s 16X32
Crosspoint Switch
VSC850
Features
• 1.6 Gb/s Operation
• Power Supply: -2 V and 3.3 V
• Non-blocking Architecture
• ECL Differential Data Paths
• 3.3 V TTL Control Signals
• Low Power Dissipation
• Package: 208-pin PQFP
• Duty-cycle Distortion: ≤ 100 pS
• ≤ 1.8 nS Propagation Delay for Data Path
• ≤ 200 pS Output to Output Skew in Broadcast Mode
General Description
This VSC850 is a 16 x 32 crosspoint switch intended for high speed digital data communications applica-
tions. This product has 16 data inputs and 32 data outputs. Any input can be multiplexed to any, some, or all out-
puts. High speed digital data up to 1.25 Gb/s can be switched with less than 100 pS pulse width distortion. In
broadcast mode, any two outputs will exhibit less than 200 pS of skew relative to one another. Signals in data
paths are fully differential to minimize duty cycle distortion. The VSC850 requires both -2V and 3.3V power
supplies.
The address signals that control traffic patterns for data paths are double buffered. LSTROBE signals load
individual addresses for each output. A GSTROBE signal is used to update addresses for all 32 outputs simulta-
neously. This method allows users to configure any, some or all switches independently without disrupting data
flow of the data paths. A CONFMODE signal is provided to allow configuring the array either as a single 16 x
32 matrix or as two parallel 16 x 16 matrix’s. Broadcast and flow through functionality are controlled via
BROADCAST and FLOWTHRU inputs.
This product is ideal for high speed digital applications including data distribution for telecommunications,
fiber channel networking, computer networking, multiprocessor switching, and test equipment. In a telecommu-
nications SONET application, for example, the VSC850 can be used as an STS-12 protection switch.
The VSC850 is packaged in a 208 pin thermally enhanced PQFP package. This product is fabricated using
Vitesse's E/D GaAs MESFET process which achieves high speed coupled with low power dissipation.
Functional Description
The VSC850 may be used to connect any one of 16 inputs to any one or combination of 32 output channels,
according to a user defined bit pattern stored in each output channel's control latches (see Figure 1). For data
path operation, signals flow transparently from inputs I+/I-[0:15] to output channels Z+/Z-[0:31] through
thirty-two 16:1 multiplexers. The traffic pattern is controlled by data previously stored in thirty-two 4-bit con-
trol latches each corresponding to an output channel. Value of these 4-bit control latches is a binary numerical
representation of the input channel selected (i.e., 0000 corresponds to I[0], 0001 corresponds to I[1], etc.).
Traffic information stored in control latches can be configured in either Single or Double Configuration
mode by controlling CONFMODE input (see Table 1). If CONFMODE is high, the switch is configured in Sin-
gle Configuration mode. In this mode, output addresses A[4:0] select one out of 32 banks of 4-bit holding regis-
ters. At rising edge of LSTROBE[0], this bank of registers is updated by input addresses D[3:0] which describes
a new path for that channel. The coding for these addresses is a binary numerical representation. D[3:0] = 0000
corresponds to I[0], 0001 corresponds to I[1], etc. Similarly, A[4:0] = 00000 selects path to output Z[0], 00001
to Z[1], etc. In this mode, values at LSTROBE[1], A[7:5] and D[7:4] inputs are ignored. In Double Configura-
G52152-0 Rev. 4.0
VITESSE SEMICONDUCTOR CORPORATION
Page 1
6/4/99
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
1.6 Gb/s 16 x 32
Crosspoint Switch
VSC850
tion mode, (CONFMODE=low), the switch matrix is divided into two 16x16 matrixes. Each of these two
matrixes are configured independently with a set of 4 input addresses and 4 output addresses. Holding registers
controlling paths to Z+/Z-[0:15] are selected with A[3:0] and updated by D[3:0] at the rising edge of
LSTROBE[0]. Holding registers controlling paths to Z+/Z-[16:31] are selected with A[7:4] and updated by
D[7:4] at the rising edge of LSTROBE[1]. Also, the coding of these addresses is binary numerical. In both
methods, after some or all holding registers are programmed, a high pulse is applied to GSTROBE to transfer the
information from holding registers into all control latches. By this method, the entire crosspoint switch can be
reconfigured simultaneously.
The VSC850 can be configured in Broadcast Single Configuration mode or Broadcast Double Configura-
tion mode. In Broadcast Single Configuration Mode, at the rising edge of LSTROBE[0], all holding registers are
updated by input addresses D[3:0]. In Broadcast Double Configuration Mode, holding registers controlling out-
puts Z+/Z-[0:15] are updated by D[3:0] at rising edge of LSTROBE[0]. Holding registers controlling Z+/Z-
[0:31] are updated by D[7:4] at rising edge of LSTROBE[1]. If a high pulse is applied to GSTROBE, the entire
crosspoint is configured and the selected data are broadcasted to all of the outputs. The output address values at
A[7:0] are ignored in Broadcast Mode.
In FlowThru Single Configuration mode, at the rising edge of LSTROBE[0], all holding registers are set to
the numerical representation of the output which they control, (i.e., 0000 is loaded for output Z[0]& Z[16],
0001 is loaded for output Z[1] & Z[17], etc.). The only difference in FlowThru Double Configuration mode is
that the values of holding registers Z+/Z-[0:15] are updated by LSTROBE[0] and registers controlling outputs
Z+/Z-[16:31] are updated by rising edge of LSTROBE[1]. If a high pulse is then applied to GSTROBE, these
values are passed to the control latches. In this mode, data from I[0] is switched to Z[0] and Z[16], data from
I[1] is switched to Z[1] & Z[17], etc. The input address values at D[7:0] and the output address values at
A[7:0] are ignored in FlowThru Mode. All data input and output signals (I+/I-[0:15], Z+/Z-[0:31]) are differ-
ential ECL levels. All other signals are TTL levels.
Table 1: Truth Table
BROADCAST
FLOWTHRU
CONFMODE
MODES
0
0
1
1
x
x
0
0
0
0
1
1
1
0
1
0
1
0
Single Configuration Mode
Double Configuration Mode
Broadcast Single Configuration Mode
Broadcast Double Configuration Mode
FlowThru Single Configuration Mode
FlowThru Double Configuration Mode
Note: CONFMODE signal asynchronously switches the two LSTROBE clocks during configuration pro-
cess. In order to prevent glitching, values of the two LSTROBE clocks have to be the same at the time the CON-
FMODE signal changes states or the content of the holding registers during this period are not guaranteed
Page 2
VITESSE SEMICONDUCTOR CORPORATION
G52152-0 Rev. 4.0
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
6/4/99
VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
1.6 Gb/s 16X32
Crosspoint Switch
VSC850
Figure 1: VSC850 Block Diagram
I+[0:15] / I-[0:15]
CONFMODE
0,1,...,15
4 to 8
or
8 to 8
Decode
16x16
4
Z+[0:15]
Z-[0:15]
D[7:0]
Switch Matrix
16x4
DIN
5 to 32
or
8 to 32
Decode
16x4
A[7:0]
Holding
64
Regsisters
16x4
Control Latches
16
16
16
16
EN
BROADCAST
GSTROBE
LSTROBE[0]
LSTROBE[1]
EN
64
16x4
Control Latches
16x4
Holding
Regsisters
DIN
FLOWTHRU
4
16x4
Z+[16:31]
Z-[16:31]
Switch Matrix
16x16
0,1,...,15
G52152-0 Rev. 4.0
6/4/99
VITESSE SEMICONDUCTOR CORPORATION
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
Page 3
VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
1.6 Gb/s 16 x 32
Crosspoint Switch
VSC850
Absolute Maximum Ratings (1)
ECL Power Supply Voltage , V potential to GND.......................................................................-2.5V to +0.5V
TT
TTL Power Supply Voltage , V
ECL input Voltage Applied, V
potential to GND.....................................................................-0.5V to +4.3V
TTL
.......................................................................................V -0.5V to +0.5V
ECLIN
TT
TTL input Voltage Applied, V
Output Current, I
..................................................................................... -0.5V to V
+1.0V
TTL
TTLIN
,(DC, output HI)......................................................................................................... 50 mA
OUT
Case Temperature Under Bias, TC..................................................................................................-55° to +125°C
Storage Temperature (ambient), TSTG. .......................................................................................-65°C to +150°C
Recommended Operating Conditions
ECL Supply Voltage, V ......................................................................................................................-2.0V ± 5%
TT
TTL Supply Voltage, V
.....................................................................................................................3.3V ± 5%
TTL
Commercial Operating Temperature Range, T(2).................................................................................. 0° to 70°C
NOTES: (1) CAUTION: Stresses listed under "Absolute Maximum Ratings" may be applied to devices one at a time without caus-
ing permanent damage. Functionality at or above the values listed is not implied. Exposure to these values for extended
periods may affect device reliability.
(2) Lower limit of specification is ambient temperature and upper limit is case temperature.
Page 4
VITESSE SEMICONDUCTOR CORPORATION
G52152-0 Rev. 4.0
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
6/4/99
VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
1.6 Gb/s 16X32
Crosspoint Switch
VSC850
DC Characteristics (Over recommended operating conditions. ECLOutput load 50Ω to V
)
TT.
Parameters
Description
Min
Typ
Max
Units
Conditions
50Ω to VTT
VODIF
VOCM
VIDIF
VICM
IIHE
Differential ECL Output Voltage
Common Mode ECL Output Voltage
Differential ECL Input Voltage
Common Mode ECL Input Voltage
Input HIGH ECL Current
Input LOW ECL Current
Input HIGH voltage (TTL)
Input LOW voltage (TTL)
Input HIGH current (TTL)
Input LOW current (TTL)
VTTL Supply Current
600
-1.5
200
-1.5
—
—
—
—
—
—
—
—
—
50
—
—
—
—
1100
-1.0
1200
-0.5
+200
—
mV
V
50Ω to VTT
mV
V
µA
µA
V
VIN = -0.7V
VIN = -2.0V
IILE
-50
2.0
0
VIHT
VILT
IIHT
4.3
0.8
V
—
—
µA
µA
mA
mA
mW
2.0V < VIN < 4.3V
-0.5V < VIN < 0.8V
IILT
-500
—
—
IVTTL
IVTT
PD
20
VTT Supply Current
—
2850
5800
Outputs open
Power dissipation
—
AC Characteristics (Over recommended operating conditions. ECL Output load 50Ω to V
)
TT.
Table 2: Data Flow Mode.
Parameters
Description
Min
Typ
Max
Units
Conditions
TPW
TDLY
Minimum input pulse width
Propagation delay
640
540
—
—
—
—
—
—
1800
100
200
pS
pS
pS
pS
Worst case 60/40 input duty cycle
—
Tduty
Tskew
Duty cycle distortion
Output to output skew
at 1.6 Gb/s Note(1)
—
On a given part broadcast mode
For any 2 paths from I+/I- to Z+/Z- on
a given part
Tpskew
Data path skew
—
—
500
pS
(1) Duty cycle distortion = duty cycle out - duty cycle in (pS) . With 8B/10B encoded data.
G52152-0 Rev. 4.0
6/4/99
VITESSE SEMICONDUCTOR CORPORATION
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
Page 5
VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
1.6 Gb/s 16 x 32
Crosspoint Switch
VSC850
AC Timing Waveforms
Figure 2: Normal Data Flow Timing
Minimum Input Pulse Width & Propagation Delay
TPW
I+ [0:15]
I-[0:15]
TDLY
TDLY
Z+ [0:31]
Z-[0:31]
TSKEW
TSKEW
Table 3: Configuration, Broadcast, FlowThru Mode.
Parameters
Description
Min
Typ
Max Units
Conditions
TLSW
TGSW
LSTROBE[0:1] pulse width
5
5
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
—
—
—
GSTROBE pulse width
TGSZ
GSTROBE to Z+/Z- Outputs Delay
LSTROBE[0:1] to Z+/Z- Outputs Delay
A[0:7] to LSTROBE setup time
1.5
2
5000
6000
—
TLSZ
GSTROBE high
TALSSU
TALSH
TDLSSU
TDLSH
TGLSU
TGLH
3
—
—
—
—
—
—
—
—
—
—
—
—
A[0:7] to LSTROBE hold time
1
—
D[0:7] to LSTROBE setup time
3
—
D[0:7] to LSTROBE hold time
1
—
GSTROBE to LSTROBE setup time
GSTROBE to LSTROBE hold time
CONFMODE to LSTROBE setup time
CONFMODE to LSTROBE hold time
BROADCAST to LSTROBE setup time
BROADCAST to LSTROBE hold time
FLOWTHRU to LSTROBE setup time
FLOWTHRU to LSTROBE hold time
2
—
2
—
TCLSSU
TCLSH
TBLSSU
TBLSH
TFLSSU
TFLSH
3.5
1
—
—
3.5
1
—
—
3.5
1
—
—
Page 6
VITESSE SEMICONDUCTOR CORPORATION
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
G52152-0 Rev. 4.0
6/4/99
VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
1.6 Gb/s 16X32
Crosspoint Switch
VSC850
Figure 3: Configuration Mode Timing
A[0:7]
(Output Address)
TALSSU
TALSH
TLSW
TLSW
TDLSH
LSTROBE[0:1]
TDLSSU
D[0:7]
(Input Address)
TGLSU
TGSW
TGLH
GSTROBE
I+ [0:15]
I-[0:15]
TGSZ
TLSZ
TDLY
Z+ [0:31]
Z-[0:31]
Figure 4: Broadcast and FlowThru Timing
CONFMODE
FLOWTHRU
TCLSH
TCLSSU
TFLSSU
TFLSH
TBLSSU
BROADCAST
TBLSH
LSTROBE[0:1]
TGLSU
GSTROBE
G52152-0 Rev. 4.0
6/4/99
VITESSE SEMICONDUCTOR CORPORATION
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
Page 7
VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
1.6 Gb/s 16 x 32
Crosspoint Switch
VSC850
Table 4: Pin Description
Name
Pin #
I/O
Level
Description
VTTL
Z9
1
PWR
O
+3.3V
ECL
ECL
GND
GND
ECL
ECL
GND
ECL
ECL
-2V
+3.3V power supply
Serial data out
Serial data out
Ground
2
ZN9
VCC
VCC
Z8
3
O
4
PWR
PWR
O
5
Ground
6
Serial data out
Serial data out
Ground
ZN8
VCC
Z7
7
O
8
PWR
O
9
Serial data out
Serial data out
-2.0 power supply
Serial data out
Serial data out
+3.3V power supply
Serial data out
Serial data out
Ground
ZN7
VTT
Z6
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
O
PWR
O
ECL
ECL
+3.3V
ECL
ECL
GND
ECL
ECL
-2V
ZN6
VTTL
Z5
O
PWR
O
ZN5
VCC
Z4
O
PWR
O
Serial data out
Serial data out
-2.0V power supply
Serial data out
Serial data out
Ground
ZN4
VTT
Z3
O
PWR
O
ECL
ECL
GND
ECL
ECL
GND
GND
ECL
ECL
GND
ECL
ECL
-2V
ZN3
VCC
Z2
O
PWR
O
Serial data out
Serial data out
Ground
ZN2
VCC
VCC
Z1
O
PWR
PWR
O
Ground
Serial data out
Serial data out
Ground
ZN1
VCC
Z0
O
PWR
O
Serial data out
Serial data out
-2.0V power supply
ZN0
VTT
O
PWR
Page 8
VITESSE SEMICONDUCTOR CORPORATION
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
G52152-0 Rev. 4.0
6/4/99
VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
1.6 Gb/s 16X32
Crosspoint Switch
VSC850
Name
Pin #
I/O
Level
Description
I0
IN0
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
I
ECL
ECL
GND
ECL
ECL
+3.3V
ECL
ECL
-2V
Serial data in
Serial data in
Ground
I
VCC
I1
PWR
I
Serial data in
Serial data in
+3.3V power supply
Serial data in
Serial data in
-2.0V power supply
Serial data in
Serial data in
Ground
IN1
I
VTTL
I2
PWR
I
IN2
I
VTT
I3
PWR
I
ECL
ECL
GND
ECL
ECL
GND
GND
ECL
ECL
+3.3V
IN3
I
VCC
I4
PWR
I
Serial data in
Serial data in
Ground
IN4
I
VCC
VCC
I5
PWR
PWR
I
Ground
Serial data in
Serial data in
+3.3V power supply
No connection
No connection
No connection
No connection
No connection
No connection
Ground
IN5
I
VTTL
N/C
N/C
N/C
N/C
N/C
N/C
VCC
VSCIPNC
VSCOPNC
VTT
I6
PWR
PWR
GND
ECL
ECL
-2V
I
Test input (tie to -2V)
Test ouput (leave open)
-2.0V power supply
Serial data in
Serial data in
Ground
O
PWR
I
ECL
ECL
GND
ECL
ECL
IN6
I
VCC
I7
PWR
I
I
Serial data in
Serial data in
IN7
G52152-0 Rev. 4.0
6/4/99
VITESSE SEMICONDUCTOR CORPORATION
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
Page 9
VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
1.6 Gb/s 16 x 32
Crosspoint Switch
VSC850
Name
Pin #
I/O
Level
Description
VCC
VCC
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
PWR
GND
GND
ECL
ECL
-2V
Ground
PWR
Ground
I8
I
Serial data in
Serial data in
-2.0V power supply
Serial data in
Serial data in
+3.3V power supply
Serial data in
Serial data in
Ground
IN8
I
VTT
PWR
I9
I
ECL
ECL
+3.3V
ECL
ECL
GND
GND
ECL
ECL
+3.3V
ECL
ECL
-2V
IN9
I
VTTL
I10
PWR
I
IN10
I
VCC
PWR
VCC
PWR
Ground
I11
I
Serial data in
Serial data in
+3.3V power supply
Serial data in
Serial data in
-2.0V power supply
Serial data in
Serial data in
Ground
IN11
I
VTTL
I12
PWR
I
IN12
I
VTT
PWR
I13
I
ECL
ECL
GND
GND
ECL
ECL
GND
ECL
ECL
-2V
IN13
I
VCC
PWR
VCC
PWR
Ground
I14
I
Serial data in
Serial data in
Ground
IN14
I
VCC
PWR
I15
I
I
Serial data in
Serial data in
-2.0V power supply
No connection
IN15
VTT
PWR
N/C
GSTROBE
VCC
I
TTL
GND
TTL
TTL
TTL
Latch enable to transfer holding register data to control latches
Ground
PWR
FLOWTHRU
BROADCAST
CONFMODE
I
I
I
Control signal to enable flow thru mode
Control signal to enable broadcast mode
Control signal to select configuration method
Page 10
VITESSE SEMICONDUCTOR CORPORATION
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
G52152-0 Rev. 4.0
6/4/99
VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
1.6 Gb/s 16X32
Crosspoint Switch
VSC850
Name
Pin #
I/O
Level
Description
N/C
N/C
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
No connection
No connection
No connection
+3.3V power supply
Serial data out
Serial data out
Ground
N/C
VTTL
Z31
PWR
O
+3.3V
ECL
ECL
GND
GND
ECL
ECL
GND
ECL
ECL
-2V
ZN31
VCC
VCC
Z30
O
PWR
PWR
O
Ground
Serial data out
Serial data out
Ground
ZN30
VCC
Z29
O
PWR
O
Serial data out
Serial data out
-2.0V power supply
Serial data out
Serial data out
+3.3V power supply
Serial data out
Serial data out
Ground
ZN29
VTT
Z28
O
PWR
O
ECL
ECL
+3.3V
ECL
ECL
GND
ECL
ECL
-2V
ZN28
VTTL
Z27
O
PWR
O
ZN27
VCC
Z26
O
PWR
O
Serial data out
Serial data out
-2.0V power supply
Serial data out
Serial data out
Ground
ZN26
VTT
Z25
O
PWR
O
ECL
ECL
GND
ECL
ECL
GND
GND
ECL
ECL
GND
ECL
ZN25
VCC
Z24
O
PWR
O
Serial data out
Serial data out
Ground
ZN24
VCC
VCC
Z23
O
PWR
PWR
O
Ground
Serial data out
Serial data out
Ground
ZN23
VCC
Z22
O
PWR
O
Serial data out
G52152-0 Rev. 4.0
6/4/99
VITESSE SEMICONDUCTOR CORPORATION
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
Page 11
VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
1.6 Gb/s 16 x 32
Crosspoint Switch
VSC850
Name
Pin #
I/O
Level
Description
ZN22
VTT
Z21
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
O
ECL
-2V
Serial data out
-2.0V power supply
Serial data out
Serial data out
Ground
PWR
O
ECL
ECL
GND
ECL
ECL
+3.3V
ECL
ECL
-2V
ZN21
VCC
Z20
O
PWR
O
Serial data out
Serial data out
+3.3V power supply
Serial data out
Serial data out
-2.0V power supply
Serial data out
Serial data out
Ground
ZN20
VTTL
Z19
O
PWR
O
ZN19
VTT
Z18
O
PWR
O
ECL
ECL
GND
ECL
ECL
GND
GND
ECL
ECL
+3.3V
TTL
TTL
TTL
TTL
TTL
TTL
GND
TTL
ZN18
VCC
Z17
O
PWR
O
Serial data out
Serial data out
Ground
ZN17
VCC
VCC
Z16
O
PWR
PWR
Ground
O
Serial data out
Serial data out
+3.3V power supply
Input address
Input address
Input address
Input address
Input address
Input address
Ground
ZN16
VTTL
D0
O
PWR
I
D1
I
D2
I
D3
I
D4
I
D5
I
PWR
I
VCC
D6
Input address
No connection
-2.0V power supply
No connection
No connection
Ground
N/C
VTT
N/C
PWR
PWR
-2V
N/C
VCC
GND
Page 12
VITESSE SEMICONDUCTOR CORPORATION
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
G52152-0 Rev. 4.0
6/4/99
VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
1.6 Gb/s 16X32
Crosspoint Switch
VSC850
Name
Pin #
I/O
Level
Description
Z15
ZN15
VCC
VCC
Z14
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
O
ECL
ECL
GND
GND
ECL
ECL
-2V
Serial data out
Serial data out
Ground
O
PWR
PWR
Ground
O
Serial data out
Serial data out
-2.0V power supply
Serial data out
Serial data out
+3.3V power supply
Input address
ZN14
VTT
O
PWR
Z13
O
ECL
ECL
+3.3V
TTL
TTL
GND
GND
TTL
TTL
+3.3V
-2V
ZN13
VTTL
D7
O
PWR
I
A0
I
Output address
Ground
VCC
VCC
LSTROBE0
LSTROBE1
VTTL
VSCTE
N/C
PWR
PWR
Ground
I
Load addresses into holding registers
Load addresses into holding registers
+3.3V power supply
Test enable (tie to -2V)
No connection
-2.0V power supply
Serial data out
Serial data out
Ground
I
PWR
I
VTT
PWR
O
-2V
ECL
ECL
GND
GND
ECL
ECL
GND
ECL
ECL
-2V
Z12
ZN12
VCC
VCC
Z11
O
PWR
PWR
O
Ground
Serial data out
Serial data out
Ground
ZN11
VCC
Z10
O
PWR
O
Serial data out
Serial data out
-2.0V power supply
No connection
Output address
Ground
ZN10
VTT
O
PWR
N/C
A1
I
PWR
I
TTL
GND
TTL
VCC
A2
Output address
G52152-0 Rev. 4.0
6/4/99
VITESSE SEMICONDUCTOR CORPORATION
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
Page 13
VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
1.6 Gb/s 16 x 32
Crosspoint Switch
VSC850
Name
Pin #
I/O
Level
Description
A3
A4
A5
A6
A7
204
205
206
207
208
I
I
I
I
I
TTL
TTL
TTL
TTL
TTL
Output address
Output address
Output address
Output address
Output address
Parametric NOR Chain
The VSC850 supports boundary scan in the form of asynchronous NOR chain at I/O ring. This feature pro-
vides the ability to test the connection for external TTL input pins to the chip. To invoke the test, drive VSCTE
input to 0V and assert all TTL inputs high. Toggle VSCIPNC input pin. Output pin VSCOPNC will toggle
accordingly. Pin VSCIPNC is held low and the first input pin, A[7], is toggled. Observe that VSCOPNC output
toggles. Similarly, assert A[7] low and toggle A[6] ... following the order of the scan chain. Note that all differ-
ential ECL pins I+[0:15]/I-[0:15] and Z+[0:31]/Z-[0:31] are excluded from this test.
Scan Chain Order :
VSCIPNC, A[7:1], LSTROBE[1:0], A[0], D[7:0], CONFMODE, BROADCAST, FLOWTHRU,
GSTROBE, VSCOPNC.
Page 14
VITESSE SEMICONDUCTOR CORPORATION
G52152-0 Rev. 4.0
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
6/4/99
VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
1.6 Gb/s 16X32
Crosspoint Switch
VSC850
Package Information
208 PQFP Package Dimensions
HEATSINK INTRUSION
NOTE 1
PIN 208
PIN 1
157
Key
mm
Tolerances
156
A
4.07
0.25
MAX
MIN
A1
A2
D
3.49
±.10
30.60
28.00
30.60
28.00
0.60
±.4
D1
±.10
E1
E
E
E1
L
±.4
±.10
+.15/-.10
BASIC
±.05
e
0.50
b
0.22
52
105
θ
0° - 10°
.15
53
104
R1
R
TYP
D1
.25
MAX
D
TOP VIEW
10°
A2
10°
e
R
R1
0° MIN
NOTES:
A1
0.25
A
(1) Exposed Heatspreader will be either
20.32 ±.50 round or 12.0 ± .50 square
(2) Drawing not to scale.
θ
0.17 MAX
Package #: 101-228-6, Issue #:1
L
b
G52152-0 Rev. 4.0
6/4/99
VITESSE SEMICONDUCTOR CORPORATION
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
Page 15
VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
1.6 Gb/s 16 x 32
Crosspoint Switch
VSC850
Ordering Information
VSC850-QG
Device Type:
VSC850: 16x32 Crosspoint Switch
Package Type
QG: 208 Plastic Quad Flat Pack (PQFP)
Notice
Vitesse Semiconductor Corporation reserves the right to make changes in its products, specifications or
other information at any time without prior notice. Therefore the reader is cautioned to confirm that this
datasheet is current prior to placing any orders. The company assumes no responsibility for any circuitry
described other than circuitry entirely embodied in a Vitesse product.
Warning
Vitesse Semiconductor Corporation’s product are not intended for use in life support appliances, devices or
systems. Use of a Vitesse product in such applications without written consent is prohibited.
Page 16
VITESSE SEMICONDUCTOR CORPORATION
G52152-0 Rev. 4.0
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
6/4/99
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