Lucent Technologies USS-720 Parallel, Port, Bridging USB to, Typical Circuit Showing, the USS

Lucent
TechnologiesInc.
	4

3

2

1

6-3

A

Sufficient grounding must be implemented on the board to ensure proper functionality. A 4-layer board design is recommended with two layers for power and ground planes.

CONNECTOR CENT36

J1

19	1	nSTROBE
20	2	Data_0
21	3	Data_1
22	4	Data_2
23	5	Data_3
24	6	Data_4
25	7	Data_5
26	8	Data_6
27	9	Data_7

2810 nACK

2911 BUSY

3012 PError

3113 SELECT

3214 nAUTOFD

3315

3416

3517

3618PLH

nSELECTIN

nFAULT

nINIT

A

												B																C						D
										VCC_5V					VCC
																	U?
										D1						8	VCC				CS		1
										DIODE																						U1
																7							2
																	nc				SK											LT1121CST_3.3
											5V_pullup					6	nc				DI		3							VCC	3	VOUT	VIN	1
																5	GND				DO		4									GND		C11	1			4
				R1	R2	R3	R4	R5	R6	R7																				+		2			2
																	93CS56												VCC		C1			C2 +
																															3.3ufd tant.					.01ufd
																																	3.3ufd tant.
										R8
																		44	43	42	41	40	39	38	37	36	35	34				VCC
														C3	C4
														.1ufd	.1ufd			D0		nSTROBE HLH PLH			Suspend GND VCC nUSB Reset DIO					CS SK
PLH																																	R10
																	1	D1										tst_rst	33				1.5k
																	2												32
										R11			24	Data_0	VDD_5V			D2										reset
											1	2					3												31
																		VDD_5V										test			R13							J2
										R12	1	2	24	Data_1			4												30	VCC
														Data_2				D3										GND			24	2				VCC_5V	1	3
										R14	1	2	24				5	D4								U2		VCC	29	1								RED
										R15	1	2	24	Data_3			6												28							DATA-	2
																		GND										DMNS										WHITE
										R17	1	2	24	Data_4			7												27	1		2				DATA+	3
																		D5										DPLS										GREEN
										R18	1	2	24	Data_5			8												26			24				GND	4
															VDD_5V			D6								PLL_VSS					R16							BLACK
										R19	1	2	24	Data_6			9												25								5
																		VDD_5V								PLL_VDD												SHIELD
										R20	1	2	24	Data_7			10												24	1
																		D7								SCAN_EN
																	11												23	C5								CON5
																		nAUTOFD										SCAN
														nACK	VCC			nSELECTIN												.1ufd
														BUSY						nINIT nACK BUSY			VCC GND PEerror SELECT nFAULT					LOCLK HICLK	QUAD_44_p	2
														PError
														SELECT
														nFAULT
										R21	1	2	24	nSTROBE				12 13		14	15 16		17 18		19	20 21		22
										R22	1	2	24	nAUTOFD
										R23	1	2	24	nSELECTIN
										R24	1	2	24	nINIT																		Standard decoupling should be used on the
																																board. 0.1ufd capacitors between VCC_5V, VCC,
																																and GND placed as close as possible to the
R33	R32	R31	R30	R29	R28	R27	R26	R25																							EEPROM	power pins on the USS-720 is recommended.						2
																																VCC				VCC
												5V_pullup																						ASIC BYPASS

CRYSTAL

C13

C12

C8

C9

C10

C6

Y1

C7

.1ufd

.1ufd

.1ufd

.1ufd

.1ufd

15 pf

15 pf

In-System Design, Inc.

1

The schematic provided with the

Boise, Idaho

Evaluation Kit is for reference only.

It’s suitability for use for any

Title

particular purpose is not warrented by

ISD-101

USB to Parallel 1284

Lucent or In-System Design.

Size

Document Number

Rev

B

{Doc}

B

Copywrite 1997, 1998, In-System Design Inc.

Date:

Wednesday, June 24, 1998

Sheet

1

of

1

B

C

D

Figure 1. USS-720 Evaluation Kit Schematic

Application Note February 1999

Bridging USB to	Typical Circuit Showing
Parallel	the USS
-720 Port