SMSC COM20020 manual PIN Configuration

controller optimized for use in industrial and automotive applications. Using an ARCNET protocol engine is the ideal solution for factory automation applications because it provides a token-passing protocol, a highly reliable and proven networking scheme, and a data rate of up to 2.5 Mbps when using the COM20020.

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 2.5 Mbps maximum data rate, and the internal diagnostics make the COM20020 the highest performance industrial communications device available.

With only one COM20020 and one microcontroller, a complete communications node may be implemented.

ARCNET is a registered trademark of Datapoint Corporation

PIN CONFIGURATION

A0/nMUX

A1

A2/ALE

AD0

AD1

AD2

D3

D4

D5

D6

D7

VSS

		24
1
		23
2
		22
	3
		21
4
		20
5
		19
6
		18
	7
		17
8
		16
	9
		15
10
		14
11
		13
12

VDD

nRD/nDS

nWR/DIR

nWR/DIR

nCS

nINTRnRD/nDS

nRESET IN VDD

nTXEN

A0/nMUX

RXIN

A1

nPULSE2

A2/ALE

nPULSE1

AD0

XTAL2

XTAL1

					N
					I							2
					T
													E
					E				N
			R		S					N			S
									E				L
			T		E		S
	S								X	I			U
			N		R		S			X
	C								T				P
			I		n		V			R
	n		n						n				n
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
1		2			S	3		4		5		6
	D		D		S		D		D		D		D
	A		A		V

nPULSE 1

XTAL2

XTAL1

VDD

VSS

N/C

D7

Packages: 24-Pin DIP or 28-Pin PLCC

Ordering Information:

COM20020 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 = Universal Local Area Network Controller (with 2K x 8 RAM)

3