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PDF SP3508 Data sheet ( Hoja de datos )
| Número de pieza | SP3508 | |
| Descripción | 8 Channel Multiprotocol Transceiver | |
| Fabricantes | Exar | |
| Logotipo |  |
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SP3508
Rugged 3.3V, 20Mbps, 8 Channel Multiprotocol Transceiver
with Programmable DCE/DTE and Termination Resistors
FEATURES
• Fast 20Mbps Differential Transmission Rates
Now Available in Lead Free Packaging
• Internal Transceiver Termination Resistors
for V.11 & V.35
Refer to page 9 for pinout
• Interface Modes:
— RS-232 (V.28)
— X.21 (V.11)
— RS-449/V.36
(V.10 & V.11)
— EIA-530 (V.10 & V.11)
— EIA-530A (V.10 & V.11)
— V.35 (V.35 & V.28)
• Protocols are Software Selectable with 3-Bit Word
• Eight (8) Drivers and Eight (8) Receivers
•Termination Network Disable Option
• Internal Line or Digital Loopback for Diagnostic Testing
• Certified conformance to NET1/NET2 and TBR-1
TBR-2 by TUV Rheinland (TBR2/30451940.001/04)
APPLICATIONS
• Router
• Frame Relay
• CSU
• Easy Flow-Through Pinout
• DSU
• +3.3V Only Operation
• PBX
• Individual Driver and Receiver Enable/Disable Controls • Secure Communication Terminals
•Operates in either DTE or DCE Mode
DESCRIPTION
The SP3508 is a monolithic device that supports eight (8) popular serial interface standards
for Wide Area Network (WAN) connectivity. The SP3508 is fabricated using a low power
BiCMOS process technology, and incorporates a regulated charge pump allowing +3.3V only
operation. Exar's patented charge pump provides a regulated output of +5.5V, 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 SP3508 requires no additional external components for compliant operation for all of the
eight (8) modes of operation other than six capacitors used for the internal charge pump. All
necessary termination is integrated within the SP3508 and is switchable when V.35 drivers
and V.35 receivers, or when V.11 receivers are used. The SP3508 provides the controls and
transceiver availability for operating as either a DTE or DCE.
Additional features with the SP3508 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 SP3508 also includes a latch enable
pin with the driver and receiver address decoder. The internal V.11 or V.35 termination can
be switched off using a control pin (TERM_OFF) for monitoring applications. All eight (8)
drivers and receivers in the SP3508 include separate enable pins for added convenience.
The SP3508 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.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7017 • www.exar.com
SP3508_100_072208
1 page  
ELECTRICAL SPECIFICATIONS
TA = 0 to 70°C and VCC = 3.3V ± 5% unless otherwise noted. The ♦ denotes the specifications which apply over the full operating tempera-
ture range (-40°C to +85°C), unless otherwise specified.
PARAMETER
MIN. TYP. MAX.
UNITS
CONDITIONS
V.35 DRIVER DC Parameters (Outputs)
Open Circuit Voltage
Test Terminated Voltage
+/-0.44
Offset
Output Overshoot
-0.2VST
Source Impedance
50
Short-Circuit Impedance
135
V.35 DRIVER AC Parameters (Outputs)
Transition Time
Propagation Delay: tPHL
Propagation Delay: tPLH
Differential Skew
30
30
Max. Transmission Rate
20
V.35 RECEIVER DC Parameters (Inputs)
Sensitivity
+/-50
Source Impedance
90
Short-Circuit Impedance
135
V.35 RECEIVER AC Parameters
Propagation Delay: tPHL
Propagation Delay: tPLH
Skew
30
30
5
Max. Transmission Rate
20
TRANSCEIVER LEAKAGE CURRENTS
Driver Output 3-State Cur-
rent
Receiver Output 3-State
Current
1
+/-1.20
+/-0.66
+/-0.6
+0.2VST
♦
♦
150 ♦
165
20 ♦
85 ♦
85 ♦
5♦
♦
+/-200
110
165
♦
85
85
10
200
10
V
V
V
V
Ω
Ω
ns
ns
ns
ns
Mbps
Per Figure 16
Per Figure 25
Per Figure 25
Per Figure 25; VST = Steady State
value
Per Figure 26; ZS = V2/V1 x 50
Per Figure 27
VCC = 3.3V for AC parameters
Per Figures 32 and 35; CL = 20pF
Per Figures 32 and 35; CL = 20pF
Per Figures 32 and 35; CL = 20pF
mV
Ω
Ω
ns
ns
ns
Mbps
Per Figure 29; ZS = V2/V1 x 50Ω
Per Figure 30
VCC = 3.3V for AC parameters
Per Figures 32 and 37; CL = 20pF
Per Figures 32 and 37; CL = 20pF
Per Figure 32; CL = 20pF
µA Per Figure 31; Drivers Disabled
µA DX = 111
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7017 • www.exar.com
SP3508_100_072208
5 Page 
SP3508 Pin Designation
Pin Number Pin Name
26 C3N
27 VSS2
28 AGND
29 AVCC
30 LOOPBACK#
31 TxD
32 TxCE
33 ST
34 RTS
35 DTR
36 DCD_DCE
37 RL
38 LL
39 RxD
40 RxC
41 TxC
42 CTS
43 DSR
44 DCD_DTE
45 RI
46 TM
47 GND
48 VCC
49 RD(B)
50 RD(A)
Description
Charge Pump Capacitor
Minus VCC
Signal Ground
Power Supply Input
Loopback Mode Enable Input
TxD Driver TTL Input
TxCE Driver TTL input
ST Driver TTL Input
RTS Driver TTL Input
DTR Driver TTL Input
DCDDCE Driver TTL Input
RL Driver TTL Input
LL Driver TTL Input
RxD Receiver TTL Output
RxC Receiver TTL Output
TxC Receiver TTL Output
CTS Receiver TTL Output
DSR Receiver TTL Output
DCDDTE Receiver TTL Output
RI Receiver TTL Output
TM Receiver TTL Output
Signal Ground
Power Supply Input
RxD Non-Inverting Input
RxD Inverting Input
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7017 • www.exar.com
11
SP3508_100_072208
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet SP3508.PDF ] | |
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