Philips NE83Q93N, NE83Q93D Datasheet

INTEGRATED CIRCUITS

NE83Q93

Enhanced coaxial Ethernet transceiver

Product specification IC19 Data Handbook

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1995 May 01

Philips Semiconductors Product specification

NE83Q93Enhanced coaxial Ethernet transceiver

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 3, 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.

FEA TURES

•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

D, N Packages

CD+ CD– RX+

RX– TX+

TX–

TEN

XLED

JLED

LCOM

2 3 4 5 6 7 8

9 10 11 12

CDS

24 23

TXO RXI

22 21

RR– RR+

GND

HBE

17 16

CRS

RLED

LINK

CLED

SD00311

Figure 1. Pin Configurations

•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) 24-Pin Plastic Small Outline Large (SOL) Package

1995 May 01 853-1738 15180

0 to +70°C 0 to +70°C

NE83Q93N SOT222–1 NE83Q93D SOT137-1

Philips Semiconductors Product specification

NE83Q93Enhanced coaxial Ethernet transceiver

PIN DESCRIPTIONS

PIN NO.

D, N PKG

1 2

3 6

7 8

9 TEN

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

17 HBE 11

12 22 RXI

23 TXO

24 CDS 18 GND Positive Supply Pin.

4 5

SYMBOL DESCRIPTION

CD+ CD–

RX+ RX–

TX+ TX–

RR+ RR–

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.

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

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.

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.

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.

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

External Resistor. A 1kΩ (1%) resistor connected between these pins establishes the signaling current at TXO. 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. Transmitter Output. This pin is connected directly (Thin Ethernet) or through an external isolating diode

(Ethernet) to the coaxial cable. 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.

Negative supply pins.

NOTE:

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

1995 May 01

Philips Semiconductors Product specification

NE83Q93Enhanced coaxial Ethernet transceiver

BLOCK DIAGRAM

COAX

CABLE

DTE

INTERFACE

RXI

TXO

CDS

TEN

HBE

BUFFER

RECEIVER

EQUALIZER

4–POLE BESSEL

LOW PASS FILTER

SENSE BUFFER

TRANSMITTER

SQUELCH

COLLISION

COMPARATOR

& HEARTBEAT GENERATOR

JABBER

TIMER

RECEIVER

SQUELCH

LINE

DRIVER

10MHz

OSC

STATUS

CONTROL

DRIVER

LINE

RECEIVE

PAIR

(RX+, RX–)

CARRIER

SENSE

(CRS)

TRANSMIT

PAIR

(TX+, TX–)

LINK COLLISION

(CLED) JABBER (JLED)

XLED RLED

LCOM

COLLISION

PAIR

(CD+, CD–)

SD00312

Figure 2. Block Diagram

ABSOLUTE MAXIMUM RATINGS

SYMBOL PARAMETER RATING UNIT

STG

SOLD

NOTE:

1. 100% measured in production.

Supply voltage Voltage at any input

Storage temperature range –65 to +150 Lead soldering temperature (10sec.) +300 Recommended max junction temperature Thermal impedance (N and A packages) 60

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

where

[(VEE x 0.015 x n

TA = Ambient temperature in °C.

θJA = Thermal resistance of package.

= Normal operating supply voltage in volts.

= Percentage of duty cycle idle

IDL

= Percentage of duty cycle receiving

= Percentage of duty cycle transmitting

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

IDL

–12 V

0 to –12 V

+150

°C °C °C

°C/W

1995 May 01

Philips Semiconductors Product specification

NE83Q93Enhanced coaxial Ethernet transceiver

ELECTRICAL CHARACTERISTICS

MAX

1,2

. No external isolation.

Without external

pull-down resistors and

no LED loads

Measured by applying

DC voltage at RXI

(CDS = 0V)

Measured as DC

voltage at RXI

RXI

(CDS = 0V)

TX+

OUT

and V

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

MIN

LIMITS

–7.5 V

–80 –90 mA

= 0V –2 +25 µA

RXI

= 0V +1 +3 µA

CDS

+2.4 V

+1.6 V

= 0V +10 µA

HBE

= V

–30 µA

–37 –45 mA ±28 ±I

= –10V –250 +250 µA

TXO

TDC

–3.7 V

–1450 –1530 –1580 mV

–3.5 V

±600 ±1100 mV

±40 mV

average DC

– V

) peak –175 –225 –275 mV

TX–

–150 –250 –350 mV

1 2 pF

6 kΩ

= 8mA V

< VEE + 5 10 µA

OUT

+1.4 V

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

SYMBOL PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

UVL

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

UVL

Supply current idle –15 –20 mA

TENH

TENL

TX10

TCOM

V V V

V R C

RXI

CDS

TENL

TDC TAC

DIS

TS RXI RXI

TXO

AUIZ

Supply current transmitting (without collision)

Receive input bias current V Cable sense input bias current V HBE input HIGH voltage V HBE input LOW voltage V HBE input HIGH current V HBE input LOW current V Input HIGH voltage at TEN VEE + 2 V Input LOW voltage at TEN VEE + 1 V Input LOW current at TEN –50 –100 µA Transmit output DC current level Transmit output AC current level

3 3

Transmit current V Transmitter output voltage compliance

Collision threshold

AUI disable voltage at RXI Differential output voltage – non idle at RX± and

CD± Differential output voltage imbalance – idle at

RX± and CD±

Output common mode voltage at RX± and CD± RXI = 0V –4.0 –5.5 –7.0 V Receiver squelch threshold Transmitter squelch threshold (V

Shunt resistance at RXI non–transmitting 100 kΩ Input capacitance at RXI

Shunt resistance at TXO transmitting 7.5 10 kΩ Differential impedance at RX± and CD± with no

coaxial cable connected Differential impedance at TX± 20 kΩ

LED driver and CRS output

Output LOW voltage I Output leakage current inactive VEE < V

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

3. I

is measured as (V

TDC

GND. I

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

is measured as (V

TAC

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

= –9V and TA = 27°C.

+ V

MAX

)/(2 x 25) where V

MIN

– V

MAX

)/(2 x 25).

MIN

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

TDC

6. Measured on secondary side of isolation transformer (see Connection Diagram, Figure 3). 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.

1995 May 01

+ 11 hidden pages