SP508
Rugged 20Mbps, 8 Channel Multi-Protocol Transceiver
with Programmable DCE/DTE and Termination Resistors
FEATURES
Now Available in Lead Free Packaging
• 20Mbps Differential Transmission Rates
Refer to page 7 for pinout
• 5kV ESD Tolerance for Analog I/Os
• Internal Transceiver Termination Resistors
for V./V.35
• Interface Modes:
– RS-232 (V.28)
– X.2 (V.)
– RS-449/V.36
(V.0 & V.)
APPLICATIONS
• Router
• Software Selectable Protocols with 3-Bit Word
• Frame Relay
• Eight Drivers and Eight Receivers
• CSU
• V.35/V. Receiver Termination Network
• DSU
Disable Option
• PBX
• Internal Line or Digital Loopback Testing
• Adheres to NET/NET2 and TBR-2 Requirements • Secure Communication Terminals
– EIA-530 (V.0 & V.)
– EIA-530A (V.0 & V.)
– V.35
• Easy Flow-Through Pinout
• +5V Only Operation
• Individual Driver/Receiver Enable/Disable Controls
• Operates in DTE or DCE Mode
DESCRIPTION
The SP508 is a monolithic device that supports eight (8) popular serial interface standards for
Wide Area Network (WAN) connectivity. The SP508 is fabricated using a low power BiCMOS
process technology, and incorporates an Exar regulated charge pump allowing +5V only
operation. Exar's patented charge pump provides a regulated output of +5.8V, which will
provide enough voltage for compliant operation in all modes. Eight (8) drivers and eight (8)
receivers can be configured via software for any of the above interface modes at any time.
The SP508 requires no additional external components for compliant operation for all of the
eight (8) modes of operation other than four capacitors used for the internal charge pump.
All necessary termination is integrated within the SP508 and is switchable when V.35 drivers
and V.35 receivers, or when V. receivers are used. The SP508 provides the controls and
transceiver availability for operating as either a DTE or DCE.
Additional features with the SP508 include internal loopback that can be initiated in any of the
operating modes by use of the LOOPBACK pin. While in loopback mode, receiver outputs
are internally connected to driver inputs creating an internal signal path bypassing the serial
communications controller for diagnostic testing. The SP508 also includes a latch enable pin
with the driver and receiver address decoder. The internal V. or V.35 receiver termination
can be switched off using a control pin (TERM_OFF) for monitoring applications. All eight
(8) drivers and receivers in the SP508 include separate enable pins for added convenience.
The SP508 is ideal for WAN serial ports in networking equipment such as routers, access
concentrators, network muxes, DSU/CSU's, networking test equipment, and other access
devices.
Applicable U.S. Patents-5,306,954; and others patents pending
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP508_00_02709
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of the
device at these ratings or any other above those indicated in
the operation sections of the specifications below is not implied.
Exposure to absolute maximum rating conditions for extended
periods of time may affect reliability.
V
CC
.................................................................................................+7V
Input Voltages:
Logic ................................................ -0.3V to (V
CC
+0.5V)
Drivers ............................................. -0.3V to (V
CC
+0.5V)
.
Receivers .............................................................±5.5V
Output Voltages:
Logic ................................................ -0.3V to (V
CC
+0.5V)
Drivers ....................................................................±2V
.
Receivers ......................................... -0.3V to (V
CC
+0.5V)
Storage Temperature .................................................-65°C to +50°C
.
Power Dissipation ..................................................................520mW
.
(derate 9.0mW/°C above +70°C)
STORAGE CONSIDERATIONS
Due to the relatively large package size, storage in a low
humidity environment is preferred. Large high density plastic
packages are moisture sensitive and should be stored in Dry
Vapor Barrier Bags. Prior to usage, the parts should remain
bagged and stored below 40°C and 60%RH. If the parts are
removed from the bag, they should be used within 48 hours
or stored in an environment at or below 20%RH. If the above
conditions cannot be followed, the parts should be baked
for four hours at 25°C in order to remove moisture prior to
soldering. Exar ships the 00-pin LQFP in Dry Vapor Barrier
Bags with a humidity indicator card and desiccant pack. The
humidity indicator should be below 30%RH.
Package Derating:
ø
JA
...................................................................52.7 °C/W
ø
JC
.....................................................................6.5 °C/W
ELECTRICAL SPECIFICATIONS
T
A
= 0°C to +70°C and V
CC
= +4.75V to +5.25V unless otherwise noted. The ♦ denotes the specifications which applies to full tempera-
ture range of -40°C to =+85°C, unless otherwise specified.
PARAMETER
LOGIC INPUTS
MIN.
2.0
±5.0
300
0.5
0.5
20
TYP.
2.4
MAX.
0.8
0.4
±5
±5
±00
UNITS
Volts
Volts
Volts
Volts
Volts
Volts
mA
Ω
µs
V/µs
µs
µs
kbps
CONDITIONS
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
I
OUT
= –3.2mA
I
OUT
= .0mA
per Figure
per Figure 2
per Figure 4, V
OUT
=0V
per Figure 5
V
CC
= +5V for AC parameters
per Figure 6; +3V to -3V
per Figure 3
LOGIC OUTPUTS
V.28 DRIVER
V
OL
V
OH
V
IL
V
IH
DC Parameters
Outputs
Open Circuit Voltage
Loaded Voltage
Short-Circuit Current
Power-Off Impedance
AC Parameters
Outputs
Transition Time
Instantaneous Slew Rate
Propagation Delay
t
PHL
t
PLH
Max.Transmission Rate
230
.5
30
5
5
V.28 RECEIVER
DC Parameters
Inputs
Input Impedance
Open-Circuit Bias
HIGH Threshold
LOW Threshold
AC Parameters
Propagation Delay
t
PHL
t
PLH
3
0.8
50
50
.7
.2
00
00
7
+2.0
3.0
500
500
kΩ
Volts
Volts
Volts
ns
ns
♦
♦
♦
♦
♦
♦
per Figure 7
per Figure 8
V
CC
= +5V for AC parameters
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP508_00_02709
2
ELECTRICAL SPECIFICATIONS
T
A
= 0°C to +70°C and V
CC
= +4.75V to +5.25V unless otherwise noted. The
♦ denotes the specifications which applies to full temperature range
of -40°C to =+85°C, unless otherwise specified.
PARAMETER
V.28 RECEIVER (cont
)
AC Parameters (cont.)
Max.Transmission Rate
MIN.
TYP.
MAX. UNITS CONDITIONS
20
235
kbps
V.10 DRIVER
DC Parameters
Outputs
Open Circuit Voltage
Test-Terminated Voltage
Short-Circuit Current
Power-Off Current
AC Parameters
Outputs
Transition Time
Propagation Delay
t
PHL
t
PLH
Max.Transmission Rate
±4.0
0.9V
OC
30
30
20
–3.25
4
20
±2.0
0.5V
OC
00
00
30
30
5
2
±6.0
±50
±00
200
500
500
+3.25
±0.3
60
60
±6.0
0.67V
OC
±0.4
+3.0
±50
±00
0
85
85
0
Volts
Volts
mA
µA
ns
ns
ns
kbps
mA
kΩ
Volts
ns
ns
kbps
Volts
Volts
Volts
Volts
Volts
mA
µA
ns
ns
ns
ns
Mbps
ns
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
per Figure 9
per Figure 0
per Figure
per Figure 2
V
CC
= +5V for AC parameters
per Figure 3; 0% to 90%
V.10 RECEIVER
DC Parameters
Inputs
Input Current
Input Impedance
Sensitivity
AC Parameters
Propagation Delay
t
PHL
t
PLH
Max.Transmission Rate
per Figures 4 and 5
V
CC
= +5V for AC parameters
V.11 DRIVER
DC Parameters
Outputs
Open Circuit Voltage
Test Terminated Voltage
Balance
Offset
Short-Circuit Current
Power-Off Current
AC Parameters
Outputs
Transition Time
Propagation Delay
t
PHL
t
PLH
Differential Skew
(|t
phl
-t
plh
|)
Max.Transmission Rate
Channel to Channel Skew
per Figure 6
per Figure 7
per Figure 7
per Figure 7
per Figure 8
per Figure 9
V
CC
= +5V for AC parameters
per Fig. 2 and 36; 0% to 90%
Using C
L
= 50pF;
per Figures 33 and 36
per Figures 33 and 36
per Figures 33 and 36
20
V.11 RECEIVER
DC Parameters
Inputs
Common Mode Range
Sensitivity
–7
+7
±0.2
Volts
Volts
♦
♦
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP508_00_02709
3
T
A
= 0°C to +70°C and V
CC
= +4.75V to +5.25V unless otherwise noted. The
♦ denotes the specifications which applies to full temperature range
of -40°C to =+85°C, unless otherwise specified.
ELECTRICAL SPECIFICATIONS
CONDITIONS
PARAMETER
V.11 RECEIVER (cont)
DC Parameters (cont.)
Input Current
Current w/ 100Ω Termination
Input Impedance
AC Parameters
Propagation Delay
t
PHL
t
PLH
Skew(|t
phl
-t
plh
|)
Max.Transmission Rate
Channel to Channel Skew
MIN.
TYP.
MAX. UNITS
–3.25
4
20
±0.44
-0.2V
ST
50
135
30
30
5
2
±3.25
±60.75
85
85
0
±0.66
±0.6
+0.2V
ST
150
165
20
85
85
0
+200
110
165
85
85
0
0
5.25
mA
mA
kΩ
ns
ns
ns
Mbps
ns
Volts
Volts
Volts
Ω
Ω
ns
ns
ns
ns
Mbps
ns
mV
Ω
Ω
ns
ns
ns
Mbps
ns
µA
µA
Volts
µA
mA
mA
mA
mA
mA
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
per Figure 20 and 22;
power on or off
per Figure 23 and 24
V
CC
= +5V for AC parameters
Using C
L
= 50pF;
per Figures 33 and 38
per Figures 33 and 38
per Figure 33
V.35 DRIVER
DC Parameters
Outputs
Test Terminated Voltage
Offset
Output Overshoot
Source Impedance
Short-Circuit Impedance
AC Parameters
Outputs
Transition Time
Propagation Delay
t
PHL
t
PLH
Differential Skew
(|t
phl
-t
plh
|)
Max.Transmission Rate
Channel to Channel Skew
per Figure 25
per Figure 25
per Figure 25; V
ST = Steady state value
per Figure 27; Z
S
= V
2
/V
x 50
per Figure 28
V
CC
= +5V for AC parameters
per Figure 29; 0% to 90%
per Figure 33 and 36; C
L
= 20pF
per Figure 33 and 36; C
L
= 20pF
per Figure 33 and 36; C
L
= 20pF
7
30
30
5
5
±50
20
90
135
20
V.35 RECEIVER
DC Parameters
Inputs
Sensitivity
Source Impedance
Short-Circuit Impedance
AC Parameters
Propagation Delay
t
PHL
t
PLH
Skew(|t
phl
-t
plh
|)
Max.Transmission Rate
Channel to Channel Skew
Driver Output 3-State Current
Rcvr Output 3-State Current
V
CC
I
CC
(Shutdown Mode)
(V.28/RS-232)
(V./RS-422)
(EIA-530 & RS-449)
(V.35)
(EIA-530A)
♦
♦
♦
♦
♦
♦
♦
per Figure 30; Z
S
= V
2
/V
x 50Ω
per Figure 3
V
CC
= +5V for AC parameters
per Figure 33 and 38; C
L
= 20pF
per Figure 33 and 38; C
L
= 20pF
per Figure 33; C
L
= 20pF
30
30
5
2
500
5.00
95
230
270
70
200
TRANSCEIVER LEAkAgE CURRENT
per Figure 32; Drivers disabled
T
X
& R
X
disabled, 0.4V - V
O
- 2.4V
POWER REQUIREMENTS
4.75
All I
CC
values are with V
CC
= +5V
f
IN
= 20kbps; Drivers active & loaded
f
IN
= 0Mbps; Drivers active & loaded
f
IN
= 0Mbps; Drivers active & loade
V.35 @ f
IN
= 0Mbps, V.28 @ 20kbps
f
IN
= 0Mbps; Drivers active & loaded
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP508_00_02709
4
OThER AC ChARACTERISTICS
T
A
= +25°C and V
CC
= +5.0V unless otherwise noted.
PARAMETER
MIN.
TYP. MAX. UNITS
CONDITIONS
DRIVER DELAY TIME bETWEEN ACTIVE MODE AND TRI-STATE MODE
RS-232/V.28
t
PZL
; Tri-state to Output LOW
t
PZH
; Tri-state to Output HIGH
t
PLZ
; Output LOW to Tri-state
t
PHZ
; Output HIGH to Tri-state
RS-423/V.10
t
PZL
; Tri-state to Output LOW
t
PZH
; Tri-state to Output HIGH
t
PLZ
; Output LOW to Tri-state
t
PHZ
; Output HIGH to Tri-state
RS-422/V.11
t
PZL
; Tri-state to Output LOW
t
PZH
; Tri-state to Output HIGH
t
PLZ
; Output LOW to Tri-state
t
PHZ
; Output HIGH to Tri-state
V.35
t
PZL
; Tri-state to Output LOW
t
PZH
; Tri-state to Output HIGH
t
PLZ
; Output LOW to Tri-state
t
PHZ
; Output HIGH to Tri-state
RS-232/V.28
t
PZL
; Tri-state to Output LOW
t
PZH
; Tri-state to Output HIGH
t
PLZ
; Output LOW to Tri-state
t
PHZ
; Output HIGH to Tri-state
RS-423/V.10
t
PZL
; Tri-state to Output LOW
t
PZH
; Tri-state to Output HIGH
t
PLZ
; Output LOW to Tri-state
t
PHZ
; Output HIGH to Tri-state
0.
0.
0.05
0.05
0.07
0.05
0.55
0.2
0.04
0.05
0.03
0.
0.85
0.36
0.06
0.05
5.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
0.0
2.0
2.0
2.0
0.0
2.0
2.0
2.0
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
C
L
= 00pF, Fig. 34 & 40; S
2
closed
C
L
= 00pF, Fig. 34 & 40; S
2
closed
C
L
= 00pF, Fig. 34 & 40; S
2
closed
C
L
= 00pF, Fig. 34 & 40; S
2
closed
C
L
= 00pF, Fig. 34 & 40; S
2
closed
C
L
= 00pF, Fig. 34 & 40; S
2
closed
C
L
= 00pF, Fig. 34 & 40; S
2
closed
C
L
= 00pF, Fig. 34 & 40; S
2
closed
C
L
= 00pF, Fig. 34 & 37; S
closed
C
L
= 00pF, Fig. 34 & 37; S
2
closed
C
L
= 5pF, Fig. 34 & 37; S
closed
C
L
= 5pF, Fig. 34 & 37; S
2
closed
C
L
= 00pF, Fig. 34 & 37; S
closed
C
L
= 00pF, Fig. 34 & 37; S
2
closed
C
L
= 5pF, Fig. 34 & 37; S
closed
C
L
= 5pF, Fig. 34 & 37; S
2
closed
RECEIVER DELAY TIME BETwEEN ACTIVE MODE AND TRI-STATE MODE
0.05
0.05
0.65
0.65
0.04
0.03
0.03
0.03
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
µs
µs
µs
µs
µs
µs
µs
µs
C
L
= 00pF, Fig. 35 & 40; S
closed
C
L
= 00pF, Fig. 35 & 40; S
2
closed
C
L
= 00pF, Fig. 35 & 40; S
closed
C
L
= 00pF, Fig. 35 & 40; S
2
closed
C
L
= 00pF, Fig. 35 & 40; S
closed
C
L
= 00pF, Fig. 35 & 40; S
2
closed
C
L
= 00pF, Fig. 35 & 40; S
closed
C
L
= 00pF, Fig. 35 & 40; S
2
closed
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP508_00_02709
5
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