Philips ne83q93 DATASHEETS

Philips Semiconductors Product specification

NE83Q93Enhanced coaxial Ethernet transceiver

1995 May 1 853-1738 15180

DESCRIPTION

The NE83Q93 is a low power coaxial transceiver interface (CTI) for Ethernet (10base5) and Thin Ethernet (10base2) local area networks. The CTI is connected between the coaxial cable and the Data Terminal Equipment (DTE) and consists of a receiver, transmitter, receive-mode collision detector, heartbeat generator and jabber timer (see Block Diagram). The transmitter output connects directly to a doubly terminated 50Ω cable, while the receiver output, collision detector output and transmitter input are connected to the DTE through isolation transformers. Isolation between the CTI and the DTE is an IEEE 802.3 requirement that can be met on signal lines by using a set of pulse transformers. Power isolation for the CTI is achieved using DC-to-DC conversion through a power transformer (see Figure 1, Connection Diagram).

The part is functionally the same as the NE83Q92, but with additional features such as a transmit enable input, a carrier detect output and five status LED driver outputs.

The NE83Q93 is manufactured on an advanced BiCMOS process and is available in an SOL package making it ideally suited to lap-top personal computers or systems where low power consumption, limited board space and jumperless design is required. Refer to selection flow chart for optimal application.

FEATURES

•Fully compliant with Ethernet II, IEEE 802.3 10BASE-5 and

10BASE-2, and ISO 8802/3 interface specifications

•Functionally compatible with industry standard 8392 applications

•Optimal implementation can use 1 Watt DC-DC converter and

reduces external parts count

•High efficiency AUI drivers minimize current consumption under

idle conditions by automatically powering-down

•Automatically disables AUI drivers when disconnecting coax

cable, allowing hard-wiring of AUI connector and local/integrated CTI connection

PIN CONFIGURATION

1 2 3 4 5 6 7 8

9 10 11 12

24 23 22 21 20 19 18 17 16 15

CD+ CD– RX+

RX– TX+

TX–

CDS TXO RXI V

RR– RR+

GND HBE

D, N Packages

TEN

XLED

JLED

LCOM

CRS RLED

LINK CLED

SD00311

•Smart squelch on data inputs eliminates false activations

•Transmit enable input and carrier sense output for repeater

applications

•Five LED status drivers for transmit, receive, collision, jabber and

link fail indication

•Advanced BiCMOS process for extremely low power operation

•Available in 24-pin DIP and 24-pin SOL packages

•Full ESD protection

•Power-on reset prevents glitches on coaxial cable

ORDERING INFORMATION

DESCRIPTION TEMPERATURE RANGE ORDER CODE DWG #

24-Pin Plastic Dual In-Line Package (DIP)

0 to +70°C

NE83Q93N 0410D

24-Pin Plastic Small Outline Large (SOL) Package

0 to +70°C

NE83Q93D SOT137-1

Philips Semiconductors Product specification

NE83Q93Enhanced coaxial Ethernet transceiver

1995 May 1

PIN DESCRIPTIONS

PIN NO.

D, N PKG

SYMBOL DESCRIPTION

1 2

CD+ CD–

Collision Outputs. Balanced differential line driver outputs which send a 10MHz signal to the DTE in the event of a collision, jabber interrupt or heartbeat test. External pull-down resistors are optional.

3 6

RX+ RX–

Receiver Outputs. Balanced differential line driver outputs which send the received signal to the DTE. External pull-down resistors are optional.

7 8

TX+ TX–

Transmitter Inputs. Balanced differential line receiver inputs which accept the transmission signal from the DTE and apply it to the coaxial cable at TXO, if it meets Tx squelch threshold.

9 TEN

Transmit Enable. A CMOS compatible input requiring an input voltage range of VEE to VEE + 5V. The transmitter and loopback functions are disabled when TEN is LOW and enabled when TEN is HIGH or left floating. TEN is

normally driven through an opto-coupler. 10 XLED Transmit Indicator. Indicates a packet is being transmitted onto the coaxial cable. 11 JLED Jabber Indicator. Indicates that the jabber timer has timed out and the coaxial driver is disabled. 12 LCOM LED Common. The anodes of all status indicator LEDs are connected to this pin. It’s voltage is VEE + 5V. 13 CLED Collision Indicator. Indicates that a collision has been detected. 14 LINK Link Indicator. Indicates that a connection is present to the coaxial cable network. 15 RLED Receive Indicator. Indicates that a packet is being received from the coaxial cable.

16 CRS

Carrier Sense. A real time output that indicates the presence of a carrier on the coaxial cable. CRS is normally

used to drive an opto-coupler. 17 HBE

Heartbeat Enable. The heartbeat function is disabled when this pin is connected to VEE and enabled when

connected to GND or left floating. 11

RR+ RR–

External Resistor. A 1kΩ (1%) resistor connected between these pins establishes the signaling current at TXO.

22 RXI

Receiver Input. This pin is connected directly to the coaxial cable. Received signals are equalized, amplified,

and sent to the DTE through the RX+

pins, if it meets Rx squelch threshold.

23 TXO

Transmitter Output. This pin is connected directly (Thin Ethernet) or through an external isolating diode

(Ethernet) to the coaxial cable. 24 CDS

Collision Detect Sense. Ground sense connection for the collision detection circuitry. This pin should be

connected directly to the coaxial cable shield for standard Ethernet operation. 18 GND Positive Supply Pin.

4 5

Negative supply pins.

NOTE:

1. The IEEE 802.3 name for CD is CI; for RX is DI; for TX is DO.

Philips Semiconductors Product specification

NE83Q93Enhanced coaxial Ethernet transceiver

1995 May 1

BLOCK DIAGRAM

RECEIVER

SQUELCH

TRANSMITTER

SQUELCH

COLLISION

COMPARATOR

& HEARTBEAT GENERATOR

JABBER

TIMER

RECEIVER

EQUALIZER

4–POLE BESSEL

LOW PASS FILTER

SENSE BUFFER

10MHz

OSC

LINE

DRIVER

COAX

CABLE

BUFFER

LINE

DRIVER

HBE

COLLISION

PAIR

(CD+, CD–)

TRANSMIT

PAIR

(TX+, TX–)

RECEIVE

PAIR

(RX+, RX–)

DTE

INTERFACE

RXI

TXO

CDS

CARRIER

SENSE

(CRS)

STATUS

CONTROL

LINK COLLISION

(CLED) JABBER (JLED)

XLED RLED

LCOM

SD00312

TEN

ABSOLUTE MAXIMUM RATINGS

SYMBOL PARAMETER RATING UNIT

Supply voltage

–12 V

Voltage at any input

0 to –12 V

STG

Storage temperature range –65 to +150

°C

SOLD

Lead soldering temperature (10sec.) +300

°C

Recommended max junction temperature

+150

°C

Thermal impedance (N and A packages) 60

°C/W

NOTE:

1. 100% measured in production.

2. The junction temperature is calculated from the following expression: TJ = TA + θ

[(VEE x 0.015 x n

IDL

) + (VEE x 0.027 x nRX) + (VEE x 0.075 x nTX)]

where

= Ambient temperature in °C.

= Thermal resistance of package.

= Normal operating supply voltage in volts.

IDL

= Percentage of duty cycle idle

= Percentage of duty cycle receiving

= Percentage of duty cycle transmitting

Philips Semiconductors Product specification

NE83Q93Enhanced coaxial Ethernet transceiver

1995 May 1

ELECTRICAL CHARACTERISTICS

VEE = –9V ±6%; TA = 0°C to +70°C unless otherwise specified

1,2

. No external isolation.

LIMITS

SYMBOL PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

UVL

Under voltage lockout. Transceiver disabled for |VEE| < |V

UVL

–7.5 V

Supply current idle –15 –20 mA

Supply current transmitting (without collision)

Without external

pull-down resistors and

no LED loads

–80 –90 mA

RXI

Receive input bias current V

RXI

= 0V –2 +25 µA

CDS

Cable sense input bias current V

CDS

= 0V +1 +3 µA

HBE input HIGH voltage V

+2.4 V

HBE input LOW voltage V

+1.6 V

HBE input HIGH current V

HBE

= 0V +10 µA

HBE input LOW current V

HBE

= V

–30 µA

TENH

Input HIGH voltage at TEN VEE + 2 V

TENL

Input LOW voltage at TEN VEE + 1 V

TENL

Input LOW current at TEN –50 –100 µA

TDC

Transmit output DC current level

–37 –45 mA

TAC

Transmit output AC current level

±28 ±I

TDC

TX10

Transmit current V

TXO

= –10V –250 +250 µA

TCOM

Transmitter output voltage compliance

–3.7 V

Collision threshold

Measured by applying

DC voltage at RXI

(CDS = 0V)

–1450 –1530 –1580 mV

DIS

AUI disable voltage at RXI

Measured as DC

voltage at RXI

–3.5 V

Differential output voltage – non idle at RX+ and CD±

±600 ±1100 mV

Differential output voltage imbalance – idle at RX± and CD±

±40 mV

Output common mode voltage at RX± and CD± RXI = 0V –4.0 –5.5 –7.0 V

Receiver squelch threshold

RXI

average DC

(CDS = 0V)

–150 –250 –350 mV

Transmitter squelch threshold (V

TX+

– V

TX–

) peak –175 –225 –275 mV

RXI

Shunt resistance at RXI non–transmitting 100 kΩ

RXI

Input capacitance at RXI

1 2 pF

TXO

Shunt resistance at TXO transmitting 7.5 10 kΩ

AUIZ

Differential impedance at RX± and CD± with no coaxial cable connected

6 kΩ

Differential impedance at TX± 20 kΩ

LED driver and CRS output

Output LOW voltage I

OUT

= 8mA V

+1.4 V

Output leakage current inactive VEE < V

OUT

< VEE + 5 10 µA

NOTES:

1. Currents flowing into device pins are positive. All voltages are referenced to ground unless otherwise specified. For ease of interpretation,

the parameter limit that appears in the MAX column is the largest value of the parameter, irrespective of sign. Similarly, the value in the MIN column is the smallest value of the parameter, irrespective of sign.

2. All typicals are for V

= –9V and TA = 27°C.

3. I

TDC

is measured as (V

MAX

+ V

MIN

)/(2 x 25) where V

MAX

and V

MIN

are the max and min voltages at TXO with a 25Ω load between TXO and

GND. I

TAC

is measured as (V

MAX

– V

MIN

)/(2 x 25).

4. The TXO pin shall continue to sink at least I

TDC

min when the idle (no signal) voltage on this pin is –3.7V .

5. Collision threshold for an AC signal is within 5% of VCD.

6. Measured on secondary side of isolation transformer (see Connection Diagram, Figure 1). The transformer has a 1:1 turns ratio with an

inductance between 30 and 100µH at 5MHz.

7. Measured as the voltage difference between the RX pins or the CD pins with the transformer removed.

8. Not 100% tested in production.

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