am7996 Advanced Micro Devices, am7996 Datasheet
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am7996
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am7996 Summary of contents
Page 1
... In an IEEE 802.3 (10BASE-5)/Ethernet application, the Am7996 interfaces the coaxial (0.4 diameter) media to the DTE through an isolating pulse transformer and the 78 attachment unit interface (AUI) cable. In IEEE 802.3 10BASE-2—Cheapernet applications, the Am7996 typi- cally resides inside the DTE with its signals to the DTE iso- lated and the coaxial (0 ...
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... Notes: Pin 1 is marked for orientation Connection 2 (IMR+ ) (ILACC ) V CC2 COLL OSC V COL NC RXT NC VC REF TAP SHIELD SQE^TEST V TX– DO+ TXT V TX+ 07506E-2 Am7996 (HIMIB ) PLCC DI+ V COL 5 17 DI– RXT TAP SHIELD ...
Page 3
... J = 20-Pin Plastic Leaded Chip Carrier (PL 020) SPEED Not Applicable Valid combinations list configurations planned to be sup- ported in volume for this device. Consult the local AMD sales office to confirm availability of specific valid combinations and to check on newly released combinations. Am7996 Valid Combinations 3 ...
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... V CC2 SQE Timing Reference (Positive Supply Voltage) Timing reference return for SQE oscillator and analog signal ground Negative Logic Supply and IC Substrate Am7996 . When a resistor is connected between EE , then internal transmit and receive EE and COLL OSC. and disabled by connecting and V ...
Page 5
... Re- quired rise and fall times of data transmitted on the net- work are maintained by the Am7996 Tap Driver. The tap driver’s output is connected to the media through exter- nal isolating diodes. To safeguard network integrity, the driver is disabled whenever power falls below the mini- mum operation voltage ...
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... AMD APPLICATIONS The Am7996 is compatible with Ethernet Version 2 and IEEE 802.3 10BASE5 and 10BASE2 applications. (See Figure 1). Ethernet Local Local CPU Memory Local Bus AUI - Attachment Unit Interface DTE - Data Terminal Equipment MAU - Media Access Unit Cheapernet Local Local CPU Memory Local Bus Table 1 ...
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... Cheapernet (IEEE 802.3, 10BASE2) Reliability Inc: 2VP5U9 Valor Electronics: PM7102 5. The capacitance of C3, Am7996 package, D3 and the printed circuit board should add up to 180 pF 20%. 6. The capacitance of C1, Am7996 package and the printed circuit board should add pF. 7. Figure 2 used for production testing of all parameters that are tested. ...
Page 8
... Cheapernet (IEEE 802.3, 10BASE2) Reliability Inc: 2VP5U9 Valor Electronics: PM7102 5. The capacitance of C3, Am7996 package, D3 and the printed circuit board should add up to 180 pF 20%. 6. The capacitance of C1, Am7996 package and the printed circuit board should add pF. 7. R9, R10 and C4 are for Receive Mode Collision detection only. ...
Page 9
... Since there are no severe layout restrictions on the transmitter circuit, the layout can be simplified by omit- ting power and ground planes from the whole area on the right side of the Am7996 as shown in Figure 4-1. 20 R5, R6, R4 RXT C1, C2 ...
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... OPERATING RANGES – +150 C Commercial (C) Devices Ambient Temperature ( +70 C Supply Voltage (V –12 +0.5 V Operating ranges define those limits between which the func- tionality of the device is guaranteed –12 +0.5 V – +0.5 V Am7996 AMD ) . . . . . . . + –8 –9 ...
Page 12
... MHz Preamble –2 Max (Note Pins 15, 17—No Connections) EE Test Conditions Ceramic DIP Plastic DIP/PLCC Am7996 Commercial Min Typ Max 0 –0.05 –0.425 –1.625 –2.0 –2.2 –0.925 –1.0 –1 ...
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... V tap V tap 50% Point at RXT at Zero Crossing at DI Outputs 20%–80%, R 80%–20 > V tap V tap (Note 10.0 MHz 10.0 MHz CI Am7996 Commercial Min Typ Max 105 160 200 1.0 –2.0 +2 340 ...
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... Determined by Am7966 External Component Diagrams values for R4 and C1 production test, input signal applied thru transformer to DO inputs. 10. Figure 2 used for production testing of all parameters. *Notes listed correspond to the respective references made in DC Characteristics and Switching Characteristics tables. 14 Am7996 load equivalent to the ...
Page 15
... Don’t Care, Any Change Permitted Does Not Apply 1/3 PE64102/PE64107 (or equivalent) + DUT – AUI Transmit (DI+, DI–,; CI+, CI–) RLX = 25 B. Test Load (TXT) Am7996 AMD OUTPUTS Will be Steady Will be Changing from Will be Changing from Changing, State Unknown Center ...
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... AMD SWITCHING WAVEFORMS DO± V IDC 2 COAX TAP (Transmit) 5 NEAR END V CAT max COAX TAP (Receive) DI± 90% 10 Transmit Function 50 Receiver Function Am7996 50% V TXTL 07506E- CAT min – 07506E-15 ...
Page 17
... SWITCHING WAVEFORMS DO± COAX TAP (Transmit) CI± * SQE^TEST pin connected DO± COAX TAP (Transmit) CI± SQE Test* 50% 13 Jabber Function Am7996 AMD TXTL – 07506E- TXTL 50 07506E-17 17 ...
Page 18
... This signal is used for test purposes. It represents the average value of the signal that might be seen on the coax tap when a collision occurs. 18 80% 20 – /CI Parameters –2 V Collision Detect Timing Am7996 –V OD 07506E- COT MIN V OD 350 – 07506E-19 ...