Datasheet SP322CF Datasheet (Sipex Corporation)

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Page 1

SP322

Programmable V.11/V .35 T ransceiver

■ +5V Only Operation

■ Programmable V.11 or V.35 Selection

■ Three Differential V.11 Transceivers in

V.11 Mode

■ Three Differential V.35 Transceivers in V.35 Mode

■ No External Reisistor Termination for Compliant V.35 Operation

■ V.11 Cable Termination (approx. 120Ω) Internally Configured in V.11 Mode

■ Tri-State capability on drivers and receivers

■ Ideal low cost solution for X.25 or Frame Relay Serial Ports

DESCRIPTION

The SP322 is a programmable V.11 or V.35 transceiver IC. The SP322 contains three drivers and three receivers when selected in each mode. The selection is done by the V.11/V.35 select pin. The V.11 transceivers can typically operate at 10Mbps while adhering to the ITU V.11 specifications. The V.35 transceivers can operate up to 10Mbps while adhering to the ITU V.35 specifications.

The SP322 contains internal resistor termination for compliant V.35 operation as well as the V.11 termination on the receiver inputs for optional cable termination. Each SP322 driver contains a control pin which disables the output and places the output pins in a high impedance state. Each receiver also has a control pin which places the receiver outputs in a high impedance state. The enable pins will disconnect the internal termination network for whichever mode the SP322 is selected. For the receivers, the enable pin will place the input pins in a high impedance (approx. 15kΩ). This allows for convenient DTE-DCE configuration by connecting the driver outputs to the receiver inputs, thus allowing the enable pins to select the desired DTE or DCE operation.

V .35

WAN

EIA-530

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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.

VCC...........................................................................+7V

Storage Temperature..........................-65˚C to +150˚C

Power Dissipation

44-pin Plastic QFP...........................1500mW

Package Derating: 44-pin Plastic QFP

øJA....................................................52 °C/W

SPECIFICATIONS

Typically 25°C @ Vcc = +5V unless otherwise noted.

MIN. TYP. MAX. UNITS CONDITIONS

LOGIC INPUTS

V V

IL IH

2.0 Volts

LOGIC OUTPUTS

V V

OL OH

2.4 Volts I

V.35 DRIVER DC Characteristics

Outputs

Test Terminated Voltage ±0.44 ±0.55 ±0.66 Volts per Figure 10 Source Impedance 50 100 150 Ω per Figure 11 Short Circuit Impedance 135 150 165 Ω per Figure 12 Offset ±0.6 Volts per Figure 10

0.8 Volts

0.4 Volts I

= -3.2mA

OUT

= 1.0mA

OUT

AC Characteristics

Outputs

Transition Time 40 ns per Figure 13; 10% to 90% Propagation Delay t

PHL

PLH

Max. Transmission Rate 10 Mbps per Figures 18 and 19

40 70 100 ns per Figures 18 and 19 40 70 100 ns per Figures 18 and 19

V.35 RECEIVER DC Characteristics

Inputs

Input Sensitivity +80 mV Input Impedance 90 100 110 Ω per Figure 14 Short Circuit Impedance 135 150 165 Ω per Figure 15

AC Characteristics

Inputs

Propagation Delay t

PHL

PLH

Max. Transmission Rate 10 Mbps per Figure 18

50 100 150 ns per Figures 18 and 21 50 100 150 ns per Figures 18 and 21

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SPECIFICATIONS

Typically 25°C @ Vcc = +5V unless otherwise noted.

MIN. TYP. MAX. UNITS CONDITIONS

V.11 DRIVER DC Characteristics

Outputs

Open Circuit Voltage ±6.0 Volts per Figure 1 Test Terminated Voltage ±2.0 ±5.0 Volts per Figure 2

Balance ±0.4 Volts per Figure 2 Offset ±3.0 Volts per Figure 2 Short-Circuit Current ±150 mA per Figure 3

Power-Off Current ±100 µA per Figure 5 AC Characteristics VCC = +5V for AC parameters Outputs

Transition Time 20 ns per Figure 4; 10% to 90%

Propagation Delay Using CL=50pF

PHL

PLH

Differential Skew 20 40 ns per Figures 18 and 19

Max. Transmission Rate 10 Mbps

V.11 RECEIVER DC Characteristics

Inputs

Common Mode Range –7 +7 Volts

Sensitivity ±0.3 Volts

Input Current ±3.25 mA per Figures 6 and 7

Current w/ 100Ω Term. ±60.75 mA per Figures 8 and 9 AC Characteristics VCC = +5V for AC parameters Inputs

Propagation Delay Using CL=50pF

PHL

PLH

Differential Skew 20 ns per Figure 18

Max. Transmission Rate 10 Mbps

0.5V

0.67V

Volts

50 80 100 ns per Figures 18 and 19 50 80 100 ns per Figures 18 and 19

50 110 150 ns per Figures 18 and 21 50 110 150 ns per Figures 18 and 21

ENABLE TIMING Driver

Enable Time See Figures 16 and 20

Enable to Low 90 500 ns CL=15pF, S1 Closed Enable to High 90 500 ns CL=15pF, S2 Closed

Disable Time See Figures 16 and 20

Disable From Low 90 500 ns CL=15pF, S1 Closed Disable From High 90 500 ns CL=15pF, S2 Closed

Receiver

Enable Time See Figures 17 and 22

Enable to Low 90 500 ns CL=15pF, S1 Closed Enable to High 90 500 ns CL=15pF, S2 Closed

Disable Time See Figures 17 and 22

Disable From Low 90 500 ns CL=15pF, S1 Closed Disable From High 90 500 ns CL=15pF, S2 Closed

POWER REQUIREMENTS

Supply Voltage V Supply Current I

Shutdown 4 µA

+4.75 +5.25 Volts

V.35 Mode 45 mA Driver outputs loaded with 100Ω V.11 Mode 95 mA Driver outputs loaded with 100Ω

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TEST CIRCUITS...

3.9kΩ

Figure 1. V.11 Driver Output Open-Circuit Voltage

OCA

OCB

50Ω

Figure 2. V.11 Driver Output Test Terminated Voltage

= 0V

±0.25V

Figure 3. V.11 Driver Output Short-Circuit Current

= 0V

50Ω

Oscilloscope

50Ω

±0.25V

Figure 5. V.11 Driver Output Power-Off CurrentFigure 4. V.11 Driver Output Rise/Fall Time

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±10V

100Ω to 150Ω

±6V

Figure 6. V.11 Receiver Input Current

V.11 RECEIVER

+3.25mA

±10V

100Ω to 150Ω

±6V

Figure 8. V.11 Receiver Input Current w/ Termination

V.11 RECEIVER

w/ Optional Cable Termination

(100Ω to 150Ω)

i [mA] = V [V] / 0.1

i [mA] = (V [V] – 3) / 4.0

–3V–10V

+10V+3V

Maximum Input Current versus V oltage

–3.25mA

Figure 7. V.11 Receiver Input IV Graph

i [mA] = V [V] / 0.1

Figure 9. V.11 Receiver Input Graph w/ Termination

–3V–6V

+6V+3V

i [mA] = (V [V] – 3) / 4.0

Maximum Input Current versus V oltage

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50Ω

24kHz, 550mV

p-p

Sine Wave

Figure 10. V.35 Driver Output Test Terminated Voltage

±2V

Figure 12. V.35 Driver Output Short-Circuit Impedance

Figure 11. V.35 Driver Output Source Impedance

50Ω

Figure 13. V.35 Driver Output Rise/Fall Time

Oscilloscope

50Ω

24kHz, 550mV

p-p

Figure 14. V.35 Receiver Input Source Impedance

Sine Wave

±2V

Figure 15. V.35 Receiver Input Short-Circuit Impedance

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1KΩ

Output

Under

Test

Test Point

1KΩC

500Ω

Receiver

Output

Figure 16. Driver Timing Test Load #2 Circuit Figure 17. Receiver Timing Test Load Circuit

VCC

Figure 18. Driver/Receiver Timing Test Circuit

SWITCHING WAVEFORMS...

+3V

DRIVER INPUT

DRIVER

OUTPUT

DIFFERENTIAL

OUTPUT

= |t

SKEW

DPLH

Figure 19. Driver Propagation Delays

– V

- t

V V

DPHL

+ –

ROUT

15pF

f = 1MHz; tR ≤ 10ns; tF ≤ 10ns

1.5V 1.5V t

PLH

1/2V

DPHL

PHL

DPLH

1/2V

+3V

f = 1MHz; tR < 10ns; tF < 10ns

ENABLE

1.5V 1.5V t

A, B

Figure 20. Driver Enable and Disable Times

2.3V

Output normally LOW

Output normally HIGH

0.5V

0.5V t

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OD2

A – B

OD2

–

RECEIVER OUT

Figure 21. Receiver Propagation Delays

PLH

f = 1MHz; tR ≤ 10ns; tF ≤ 10ns

0V 0V

50%

INPUT

OUTPUT

PHL

50%

+3V

ENABLE

1.5V 1.5V

RECEIVER OUT

Figure 22. Receiver Enable and Disable Times

f = 1MHz; tR < 10ns; tF < 10ns

50%

Output normally LOW

Output normally HIGH

0.5V

Figure 23. Typical V.11 Driver Output

Figure 24. Typical V.35 Driver Output

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Figure 25. SP322 Pinout

EN_R2

EN_R3 R1IN(a) R1IN(b) R2IN(a) R2IN(b) R3IN(a) R3IN(b)

T1IN T2IN T3IN

EN_R1

GND

VCC

GND

R3OUT

R2OUT

R1OUT

EN_T1

EN_T2

EN_T3

VCC

1 2 3 4 5 6 7

9 10 11

V.11/V.35

V.11_TERM

1.0µF

SP322

C1+

VCC

VDD

1.0µF

C1+

Charge Pump

C1–

C2+

C2–

T1IN

T1ENA

T2IN

T2ENA

T3IN

T3ENA

R1OUT

R1ENA

R2OUT

R2ENA

R3OUT

R3ENA

C2+

+5V

SP322

GND

C1–

T1OUT(a)

T1OUT(b)

GND

VCC

T2OUT(a)

T2OUT(b)

GND

VCC

T3OUT(a)

T3OUT(b)

GND

C2–

VSS

1.0µF

T1OUTA

T1OUTB

T2OUTA

T2OUTB

T3OUTA

T3OUTB

R1INA R1INB

R2INA R2INB

R3INA R3INB

V.11_TERM

V.11/V.35

1.0µF

Figure 26. SP322 Typical Operating Circuit

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THEORY OF OPERATION

The SP322 is a programmable V.11 or V.35 transceiver IC. It contains three driver and three receivers which can be configured to either V.11 or V.35 physical layer electrical characteristics. The transceivers within the SP322 include all the necessary termination resistor networks required for compliant V.11 and V.35 signals. This simplifies serial port designs using V.11 or V.35 where the engineer does not have to configure V.11 cable termination resistors and the V.35 network.

The SP322 contains four basic blocks: the charge pump, differential drivers, differential receivers, termination network circuitry. Each block is described in the following.

Charge–Pump

The SP322 charge pump is smaller version of the Sipex–patented design (U.S. 5,306,954). The charge pump still requires four external capacitors and uses a four–phase voltage shifting technique to attain symmetrical 10V power supplies. But the pump is only used for providing internal biasing for the transceivers and the termination circuitry. The VDD and VSS outputs provide only 3mA of output current and should not be connected to bias other external circuitry.

Recommended charge pump capacitor values are 1µF or greater. The internal oscillator provides a clock rate for the charge pump which typically operates at 15kHz.

Drivers

The SP322 has three differential drivers. There are two types of drivers includes within the SP322: V.11 drivers and V.35 drivers.

When configured in V.11 mode, the V.11 drivers produce a differential output compliant with the V.11 and RS-422 electrical specifications. This includes the all the DC electrical parameters such as VOC, VT, VOS, etc. The strength of the SP322 drivers allow them to also drive signals per the RS-485 standard. The VT minimum of ±1.5V is provided by the driver output given a load of 54Ω as opposed to ±2.0V with a 100Ω load for RS-422. However, the drivers are not intended to operate over the RS-485 common mode range of +12V to -7V. The common

mode range for the V.11 drivers is +7V to -7V which is in accordance to the ITU V.11 specification.

When in V.35 mode, the drivers provide V.35 signals compliant to the ITU V.35 electrical specification. Specifically, the V.35 driver is designed to supply a differential output of ±0.55V with an offset of less than 0.6V. With Sipex's patent-pending V.35 driver design, the driver also adheres to impedance measurements such as driver output source impedance (100Ω ±50Ω) and driver output short-circuit impedance (150Ω ±15Ω). Traditional V.35 drivers require a resis- tor network to provide the proper V.35 impedance specifications for the driver outputs. The SP322 V.35 driver does this without the aid of any external components attached to the driver output. Its unique design contains internal resistance matching and switching to provide compliant V.35 signals.

Each driver includes an enable pin for added convenience. The driver enable pins are low active and will tri-state the driver outputs if a logic "1" is applied. During this state, the drivers are high impedance. The enable pins include a pull-down resistor so that the pin can be unconnected where the driver will always be enabled. Regardless of physical protocol, the drivers can operate to at least 10Mbps.

Receivers

The SP322 has three differential receivers which are used for either V.11 or V.35. The receivers have a 200mV sensitivity and operate over the common mode range of +7V to -7V. The receiver itself is the same in either V.11 or V.35 mode. The receiver input termination is configured differently for each mode (V.11/V.35 pin).

The receivers also include enable pins for convenience. The receiver enable pins are high active where a logic "0" will tri-state the receiver outputs. During tri-state, the receiver inputs are approximately 12kΩ. Any termination associated with the operating mode is disconnected during tri-state of that receiver. The receiver enable pins have a pull-up resistor that allows the pins to be unconnected. The receiver will always be active in this case. The differential receiver can operate to at least 10Mbps.

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Termination Circuitry

Unique to Sipex, the SP322 provides internal resistor networks for V.35 as well as the cable termination for V.11. The resistor network for the V.35 receivers are configured as a typical V.35 receiver using two 51Ω resistors in series tied to the A and B inputs with a 124Ω center-tap resistor to ground. The network is internally switched on during V.35 mode (V.11/V.35 = VCC) using high performance, low rON transistors. The transistors can operate efficiently over +7V to -7V, and can tolerate over +10V to -10V without damage. This termination provides the proper V.35 receiver input impedance of 100Ω and short-circuit impedance at 2V of 150Ω with 10% accuracy.

The configuration for the V.11 receiver input resistor network is similar to the V.35 network except that the 124Ω resistor is disconnected (V.11/V.35 = 0V). A series resistor is also added increase the input impedance to over 120Ω for the V.11 cable termination. The minimum resistance per the ITU V.11 specification is 100Ω. The V.11 termination can be switched off using the V.11_TERM pin. For a terminated V.11 receiver, this pin is at a logic "1". A logic "0" will inform the switches to disconnect the V.11 termination.

Applications Information

The SP322 is designed for serial port applications needing V.11 and V.35 transceivers. The SP322 supports a variety of physical layer protocols such as EIA-530, EIA-530A, RS-449, and V.36 where V.11 transceivers are used for clock and data signals. The termination resistors are recommended for crosstalk and reflections elimination under higher speed operation. Internal termination solves many headaches and configuration hassles with implementing V.11 and V.35. The SP322 provides a simple, lowcost solution for the clock and data lines for synchronous serial ports. The handshaking lines such as CTS, DTR, etc. can be implemented using discrete RS-422 or RS-232 transceivers, depending on the mode supported. Sipex supplies either differential (V.11) or singleended (V.28) discrete transceiver products to mate with the SP322.

Shutdown

The SP322 includes a shutdown pin (SD) which disables the charge pump and all power consuming circuitry to provide low ICC. A logic "1" to the SD pin will shut down the SP322 where it will draw less than 20µA of current.

NET1/2 European Compliancy

As with all of Sipex's previous multi-protocol transceiver ICs, the SP322 drivers and receivers have been designed to meet all electrical specifications for ITU V.11 and V.35. Furthermore, it is internally tested and will pass the NET1/2 physical layer testing requirements. Please note that although the SP322 adheres to NET1/2 testing, any complex or unusual configuration should be double-checked to ensure NET compliance. Consult factory for details.

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PACKAGE:

0.30" RAD. TYP.

44-PIN LQFP (Low Profile QFP)

0.20" RAD. TYP.

-A-

-B-

Standoff

Lead

Coplanarity

ccc C

Seating

Plane

-C-

13˚ TYP.

6°±4°

.25

-DE

0.17 MAX.

ø L

13˚ TYP.

FOOTPRINT

DIMENSIONS

ccc

Another variation of Pin 1 Visual Aid

(BODY +)

MAX.

+0.05/0.05

BASIC

+0.15/0.15

BASIC

±0.05

MAX.

NOM.

2.0 mm 44L

1.60

0.15

1.40

12.00

10.00

12.00

10.00

0.60

0.80

0.35 7

0.20

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Model Temperature Range Package Types

ORDERING INFORMATION

SP322CF ........................................................................... 0°C to +70°C ............................................................................................. 44–pin LQFP

Please consult the factory for pricing and availability on a Tape-On-Reel option.

Corporation

SIGNAL PROCESSING EXCELLENCE

Sipex Corporation Headquarters and

Sales Office

22 Linnell Circle Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@sipex.com

Sales Office

233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600

Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described hereing; neither does it convey any license under its patent rights nor the rights of others.

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