High Drive Dual 2-Channel LVDS Repeater/Mux
COMLINKTM SERIES
CY2LL8422
Cypress Semiconductor Corporation
3901 North First Street
San Jose
CA 95134
408-943-2600
Document #: 38-07411 Rev. **
Revised July 3, 2002
8422
Features
ANSI TIA/EIA-644-1995 Compliant
Designed for Data rates to 650 MBps = (325 MHz)
Dual 2x2
-- Low Voltage Differential Signaling with output volt-
ages of 350 mV into 100-ohm load version (Std)
Single 3.3V supply
Accepts 35 mV differential inputs
Output drivers are high impedance when disabled or
when V
DD
<1.5V
28-pin SSOP/TSSOP packages
Industrial version available
Description
The Cypress CY2LL8422 are differential line drivers and re-
ceivers that utilize Low Voltage Signaling or LVDS, to achieve
signaling rates of 650 MBps. The receiver outputs can be
switched to either or both drivers through the multiplexer con-
trol signals S2/S3. This provides flexibility in application for
either a splitter or router configuration with a single device.
The Cypress CY2LL8422 are configured as dual 2-channel
repeaters/Muxes.
The LVDS standard provides a minimum differential output
voltage of 247 mV into a 100-ohm load and receipt of as little
as 100 mV signals with up to 1V of DC offset between trans-
mitter and receiver.
A doubly terminated Bus LVDS line enables multipoint con-
figurations.
Designed for both point-to-point based-band multipoint data
transmission over controlled impedance lines.
Block Diagram
Pin Configuration
1 Y
1 Z
2 Y
2 Z
2 7
2 6
23
24
1 A
1 B
2 A
2 B
2
1
6
7
1 D E
2 D E
3
5
S0S1
3 Y
3 Z
4 Y
4 Z
20
19
17
16
3 A
3 B
4 A
4 B
8
9
1 3
1 4
1 0
1 2
S2 S3
3 D E
4 D E
1 1
1 8
2 5
4
VDD
1Y
1Z
2DE
2Z
2Y
3Z
3Y
4DE
4Z
4Y
GND
GND
VDD
28pin TSSOP/SSOP
CY2L
L
8422
1
2
3
4
5
6
7
8
9
10
11
12
13
14
20
28
27
26
25
24
23
22
21
15
16
17
18
19
1B
1A
S0
1DE
S1
2A
2B
3B
3A
S2
3DE
S3
4A
4B
CY2LL8422
Document #: 38-07411 Rev. **
Page 2 of 12
Pin Description
Pin Number
Pin Name
Description
15, 22
GND
Ground
2, 1
1A, 1B
Differential Input Channel 1
3
S0
Function Select Channel 1&2
4
1DE
Data Enable Channel 1
5
S1
Function Select Channel 1& 2
6, 7
2A, 2B
Differential Input Channel 2
21, 28
VDD
Power Supply
8, 9
3A, 3B
Differential Input Channel 3
10
S2
Function Select Channel 3 & 4
11
3DE
Data Enable Channel 3
12
S3
Function Select Channel 3 & 4
13, 14
4A, 4B
Differential Input Channel 4
17, 16
4Y, 4Z
Differential Output Channel 4
18
4DE
Data Enable Channel 4
20, 19
3Y, 3Z
Differential Output Channel 3
23, 24
2Y, 2Z
Differential Output Channel 2
25
2DE
Data Enable Channel 2
27, 26
1Y, 1Z
Differential Output Channel 1
Table 1. Mux Function Table
Input
Output
Function
S0
S1
1Y/1Z
2Y/2Z
0
0
1A/1B
1A/1B
Splitter A
1
0
2A/2B
2A/2B
Splitter B
0
1
1A/1B
2A/2B
Pass Thru Router
1
1
2A/2B
1A/1B
Cross Point Router
S2
S3
3Y/3Z
4Y/4Z
0
0
3A/3B
3A/3B
Splitter A
1
0
4A/4B
4A/4B
Splitter B
0
1
3A/3B
4A/4B
Pass Thru Router
1
1
4A/4B
3A/3B
Cross Point Router
CY2LL8422
Document #: 38-07411 Rev. **
Page 3 of 12
Note:
1.
Stresses greater than those listed under absolute maximum ratings may cause permanent damage to the device. This is intended to be a stress rating only and
functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure
to absolute maximum rating conditions for extended periods may affect reliability.
Table 2. Absolute Maximum Rating Over Operating Free-Air Temperature
[1]
Supply Voltage Range, V
DD
(1)
0.5V to 4V
Voltage Range (DE,S0,S1)
0.5V to 6.0V
Input Voltage Range, V
IN
(A or B)
0.5V to V
DD
+ 0.5V
ESD (All pins)
Class 3, A: 2KV, B:500V
Storage Temperature Range
65
C to 150
C
Table 3. Recommended Operating Conditions
Parameter
Description
Min.
Typ.
Max.
Unit
V
DD
Supply Voltage
3
3.3
3.6
V
V
IH
High Level Input Voltage
(S0,S1,1DE,2DE)
(S2,S3,3DE,4DE)
2
V
IL
Low Level Input Voltage
(S0,S1,1DE,2DE)
(S2,S3,3DE,4DE)
0.8
V
ID
Magnitude of Differential Input Voltage
0.1
0.6
V
IC
Common Mode Input Voltage
V
ID
/2
2.4 (V
ID
/2)
T
A
Operating Free Air Temperature
Industrial
40
85
C
Commercial
0
70
Table 4. Receiver Electrical Characteristics Over Recommended Operating Conditions
Parameter
Description
Condition
Min.
Typ.
Max.
Unit
V
ITH+
Positive-going Differential Input Voltage Threshold
V
CM
= 1.2V
100
mV
V
ITH-
Negative-going Differential Input Voltage Threshold
V
CM
= 1.2V
100
mV
I
I
Input Current (A Inputs) [Fail Safe]
V
I
= 0V
0.5
10
A
V
I
= 2.4V
10
A
I
I
Input Current (B Inputs) [Fail Safe]
V
I
= 0.8V
0.5
10
A
V
I
= 2.4V
10
A
I
I
(Off)
Power Off Current (A or B Inputs)
V
DD
= 0V
0.1
10
A
CY2LL8422
Document #: 38-07411 Rev. **
Page 4 of 12
Table 5. Receiver Electrical Characteristics Over Recommended Operating Conditions
Parameter
Description
Condition
Min.
Typ.
Max.
Unit
V
OD
Differential Output Voltage Swing
RL = 100 ohm
See Figure 6
247
340
454
mV
~V
OD
Change in differential Output Voltage
Swing between Logic States
50
50
mV
V
OC
(SS)
Steady State Common-mode output
voltage
See Figure 6
1.125
1.375
V
~V
OC
(SS)
Change in Steady State Com-
mon-mode output between Logic
States
50
3
50
mV
V
OC
(PP)
Peak to Peak Common-mode output
voltage
150
mV
I
CC
Supply Current
No load
20
28
mA
RL = 100 ohm
@3.3V, F
IN
= 75 MHz
50
mA
Both Channels Disabled
16
24
mA
I
IH
High-Level Input Current
s0,s1,S2, S3,
1de,2de,3DE,
4DE
V
IH
= 5V
15
A
I
IL
Low-Level Input Current
s0,s1,S2, S3,
1de,2de,3DE,
4DE
V
IL
= 0.8V
5
A
I
OS
Short Circuit Current
V
OY
or V
0Z
= 0V
20
mA
V
OD
= 0V
20
I
OZ
High Impedance Output Current
V
OD
= 600 mV
0.1
1
A
V
O
= 0V or V
DD
0.1
1
I
O(off)
Power-Off Output Current
V
DD
= 0V, V
O
= 3.6V
0.1
10
A
C
in
Input Capacitance
1A, 1B, 2A, 2B, 3A, 3B,
4A, 4B
3
pF
Control Input Capacitance
s0,s1,S2, S3,
1de,2de,3DE, 4DE
6
pF
CY2LL8422
Document #: 38-07411 Rev. **
Page 5 of 12
Table 6. Differential Receiver to Driver Switching Characteristics Over Recommended Operating Conditions
[2]
Parameter
Description
Condition
Min.
Typ.
[3]
Max.
Unit
T
PLH
Differential Propagation delay, low to high
CL = 10 pF
(see Figure 8)
4
6
ns
T
PHL
Differential Propagation delay, high to low
4
6
ns
T
sk(p)
Pulse Skew (T
PHL
-T
PLH
)
0.2
ns
T
r
Transition Low to High
800
1500
ps
T
f
Transition High to Low
800
1500
ps
T
PHZ
Propagation delay, high level to high impedance output
(see Figure 8)
4
10
ns
T
PLZ
Propagation delay, low level to high impedance output
4.3
10
ns
T
PZH
Propagation delay, high impedance to high level output
3
10
ns
T
PZL
Propagation delay, high impedance to low level output
2
10
ns
T
PHL_skR1_Dx
Channel to Channel skew-receiver 1 to Any mux related
drivers
95
ps
T
PLH_skR1_Dx
Channel to Channel skew-receiver 1 to Any mux related
drivers
95
ps
T
PPHL_skR2_Dx
Channel to Channel skew-receiver 2 to Any mux related
drivers
95
ps
T
PLH_skR2_Dx
Channel to Channel skew-receiver 2 to Any mux related
drivers
95
ps
T
PHL_skR3_Dx
Channel to Channel skew-receiver 3 to Any mux related
drivers
95
ps
T
PLH_skR3_Dx
Channel to Channel skew-receiver 3 to Any mux related
drivers
95
ps
T
PHL_skR4_Dx
Channel to Channel skew-receiver 4 to Any mux related
drivers
95
ps
T
PLH_skR4_Dx
Channel to Channel skew-receiver 4 to Any mux related
drivers
95
ps
Note:
2.
These parameters are measured over supply voltage and temperature ranges recommended for the device.
3.
All typical values are measured at 25C with a 3.3V supply.
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