COM20020-5 Datasheet, PDF (3/58 Pages) SMSC Corporation – Universal Local Area Network Controller with 2K x 8 On-Board RAM

protocol, a highly reliable and proven networking
scheme, and a data rate of up to 5 Mbps when
using the COM20020-5.
A token-passing protocol provides predictable
response times because each network event
occurs within a predetermined time interval,
based upon the number of nodes on the
network. The deterministic nature of ARCNET
is essential in mission critical applications.
The integration of the 2Kx8 RAM buffer on-chip,
the Command Chaining feature, the 5 Mbps
maximum data rate, and the internal diagnostics
make the COM20020-5 the highest performance
industrial communications device available.
With only one COM20020-5 and one
microcontroller, a complete communications
node may be implemented.
ARCNET is a registered trademark of Datapoint Corporation
PIN CONFIGURATION
A0/nMUX
1
A1
2
A2/ALE
3
AD0
4
AD1
5
AD2
6
D3
7
D4
8
D5
9
D6
10
D7
11
VSS
12
24
VDD
23
nRD/nDS
22
nWR/DIR
21
nCS
20
nINTR
19
nRESET IN
18
nTXEN
17
RXIN
16
nPULSE2
15
nPULSE1
14
XTAL2
13
XTAL1
nWR/DIR
nRDn/DS
VDD
AO/nMUX
A1
A2/ALE
AD0
25 24 23 22 21 20 19
26
18
27
17
28
16
1
15
2
14
3
13
4
12
5 6 7 8 9 10 11
nPULSE 1
XTAL2
XTAL1
VDD
VSS
N/C
D7
Packages: 24-Pin DIP or 28-Pin PLCC
Ordering Information:
COM20020-5 P
PACKAGE TYPE: P = Plastic, LJP = PLCC
TEMP RANGE: (Blank) = Commercial: 0°C to +70°C
I = Industrial: -40°C to +85°C
DEVICE TYPE: 20020-5 = Universal Local Area Network Controller
(with 2K x 8 RAM)
3