com20020-5 Standard Microsystems Corp., com20020-5 Datasheet - Page 13

• Manufacturer Part Number: com20020-5
• Description: Com20020-5 Ulanc Universal Local Area Network Controller With 2k X 8 On-board Ram
• Manufacturer: Standard Microsystems Corp.

nPULSE1
nPULSE2
FIGURE 2 - MULTIPLEXED, 8051-LIKE BUS INTERFACE WITH RS-485 INTERFACE
TXEN
RXIN
GND
8051
BACKPLANE CONFIGURATION
AD0-AD7
RESET
XTAL1
XTAL2
nINT1
ALE
A15
FIGURE A
nWR
nRD
47 pF
AD0-AD2, D3-D7
A2/BALE
nRESET IN
nRD/nDS
nWR/DIR
AO/nMUX
nCS
nINTR
+5V
100 Ohm
COM20020-5
13
40 MHz
1K
nPULSE1
RXIN
NOTE: COM20020-5 must be in Backplane Mode
nPULSE1
nPULSE2
nTXEN
RXIN
GND
47 pF
FIGURE B
Differential Driver
Configuration
*
Media Interface
may be replaced
with Figure A, B or C.
+5V
+5V
75ALS176B
or Equiv.
2
6
7
3
2
6
7
2 Fiber Interface
(ST Connectors)
HFD3212-002
HFE4211-014
Transmitter
Receiver