1 2 3 4

A

B

C

D

4321

D

C

B

A Title

Number RevisionSize

Orcad A

Date: 27-Sep-2001 Sheet of File: C:\ISP\isp_cable\rev5\isp_r5.ddb Drawn By:

R16 100

1 23 45 67 89 10

JP1

HEADER 5X2

R224.7k

R214.7k

R264.7k

1A12

1Y118

1A24

1Y216

1A36

1Y314

1A48

1Y412

2A111

2Y19

2A213

2Y27

2A315

2Y35

2A417

2Y43

1G1

VCC20

2G19

GND10

U1

74VHC244

R17 100

R1330ohm

R18 100

R19 100

R234.7k

R20 100

D1

1N4148R244.7k

C10.1uF

L1

LED

R254.7k

INI

TCK

AF

TMS

TDI

INITSEL_IN

AUTOSTROBE

nACK

BUSY

TDO

TDOINIAF

TCK

TMS

TDI

D7

D0

GND

GND

GND

VCC

VCC

GND

VCC

20-SOIC

Buffer/Line Driver

10 Pin Header to ISP Board

1 2 3 4

A

B

C

D

4321

D

C

B

A Title

Number RevisionSize

Orcad A

Date: 27-Sep-2001 Sheet of File: C:\ISP\isp_cable\rev5\isp_r5.ddb Drawn By:

R15 30K

R11 4.7K

R3 100

R13 4.7K

R14 3.3K

R10 4.7K

D4 1N4148

R4 100

D3 1N4148

D2 1N4148

R2 100

R7 100

R6 100

13251224112310229218207196185174163152141

P1

DB25

- +

567

84

U2BLM393

R8 100

R5 100

R9 100- +

321

84

U2ALM393

R12 10K

STROBE

AUTO

INIT

SEL_IN

ERROR

D0

ERROR

D7

BUSY

nACK

GND

VCC

GND

VCC

GND

VCC

VCC

Parallel Port Section

1.36V at VCC = 3.32.Vref1.5V - 1.6V

3V

Voltage Detection

8-SOP 8-SOP