CY7B8392
Ethernet Coax Transceiver Interface
Functional Description
1CY7B8392
Features
•
•
•
•
•
Compliant with IEEE802.3 10BASE5 and 10BASE2
Pin compatible with the popular 8392
Internal squelch circuit to eliminate input noise
Hybrid mode collision detect for extended distance
Automatic AUI port isolation when coaxial connector is
not present
• Low power BiCMOS design
• 16-Pin DIP or 28-Pin PLCC
The CY7B8392 is a low power coaxial transceiver for Ethernet
10BASE5 and 10BASE2 applications. The device contains all
the circuits required to perform transmit, receive, collision detection, heartbeat generation, jabber timer and attachment
unit interface (AUI) functions. In addition, the CY7B8392 features an advanced hybrid collision detection.
The transmitter output is connected directly to a double terminated 50Ω cable.
The CY7B8392 is fabricated with an advanced low power
BiCMOS process. Typical standby current during idle is 25 mA.
Logic Block Diagram
RX+
HIGH PASS
EQUALIZATION
AUI
DRIVER
CCM
RX–
RXI
LOW PASS
FILTER
CD+
–
GND
LOW PASS
FILTER
AUI
DRIVER
CARRIER
SENSE
+
CD–
TX+
–
CDS
LOW PASS
FILTER
RCV
TX–
COLLISION
+
TXO
+
WAVEFORM
SHAPING
VEE
10 MHz CLK
OSC
DC/AC
SQUELCH
–
JABBER RESET
TIMER 0.4 sec
WATCH DOG
TIMER 26 ms
RR+
REFERENCE
CIRCUIT
1K
TRANSMIT
STATE
MACHINE
RR–
RECEIVE
STATE
MACHINE
8392–1
HBE
Pin Configurations
PLCC
Top View
RX+
CD–
CD+
CDS
TXO
NC
RXI
DIP
Top View
16
CDS
2
15
TXO
RX+
3
14
RXI
VEE
4
13
VEE
VEE
5
12
RR–
RX–
6
11
RR+
TX+
7
10
GND
TX–
8
9
HBE
7B8392
4 3 2 1 28 2726
VEE (NC)
VEE (NC)
VEE
VEE
VEE (NC)
VEE (NC)
VEE (NC)
5
6
7
7B8392
8
9
10
11 1213 14 15 16 1718
8392–3
Cypress Semiconductor Corporation
Document #: 38-02016 Rev. **
•
3901 North First Street
•
VEE (NC)
VEE
VEE (NC)
VEE (NC)
VEE
VEE (NC)
RR–
25
24
23
22
21
20
TX–
HBE
GND
GND
RR+
1
CD–
RX–
TX+
CD+
San Jose
8392–2
•
CA 95134 • 408-943-2600
Revised January 1996
