com20020-5 Standard Microsystems Corp., com20020-5 Datasheet - Page 3

• 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.

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.
A0/nMUX
A2/ALE
AD0
AD1
AD2
VSS
D3
D4
D5
D6
D7
A1
Packages: 24-Pin DIP or 28-Pin PLCC
Ordering Information:
COM20020-5
10
11
12
1
2
3
4
5
6
7
8
9
P
24
23
22
21
20
19
18
17
16
15
14
13
PACKAGE TYPE: P = Plastic, LJP = PLCC
TEMP RANGE:
DEVICE TYPE: 20020-5 = Universal Local Area Network Controller
VDD
nRD/nDS
nWR/DIR
nCS
nINTR
nRESET IN
nTXEN
RXIN
nPULSE2
nPULSE1
XTAL2
XTAL1
PIN CONFIGURATION
AO/nMUX
nRDn/DS
nWR/DIR
3
A2/ALE
(with 2K x 8 RAM)
(Blank) = Commercial: 0°C to +70°C
I = Industrial: -40°C to +85°C
AD0
VDD
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
microcontroller, a complete communications
node may be implemented.
ARCNET is a registered trademark of Datapoint Corporation
A1
26
27
28
1
2
3
4
only
25
5
24
6
one
23
7
22
8
COM20020-5
21
9
20 19
10
11
18
17
16
15
14
13
12
nPULSE 1
XTAL2
XTAL1
VDD
VSS
N/C
D7
and
one