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ISA Backplane

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Introduction

ISA Backplane board is designed to be used together with Xi 8088 processor board, but it can be used with other ISA SBC boards. In addition to eight parallelly connected ISA slots this backplane includes an ATX power on/off circuit, a Port 80h POST display, a -5V regulator (most ATX power supplies don't supply -5V, but it can be required for some older ISA cards), serial port header, and a prototyping space.

 

Picture

Image: /f/1351978930/ISA%20Backplane.jpg

 

Specifications

  • 8 ISA Slots
  • Micro ATX compatible form factor
  • ATX power control circuit
  • -5V regulator
  • Port 80h POST diagnostic display
  • 5 Power indicator LEDs (standby, 5V, -5V, 12V, -12V)
  • Serial DE9M header
  • Reset button and header

 

Hardware Documentation

 

Schematic

ISA Backplane - Schematic - Color - 1.0.pdf

 

PCB Layout

ISA Backplane - Board - Color - 1.0.pdf

 

Jumpers, Connectors, and Switches

<to be updated>

 

It is recommended to solder wire bridges instead of J2 - J4 according to your 7-segment LED display and binary to 7-segment decoder type. Please refer to Bill of Materials section for displays' and decoders' selection.

 

 

Bill of Materials (BOM)

 

BOM Notes

 

BOM

Component type  Reference
 Description
 Quantity
Possible sources and notes
PCB   ISA Backplane PCB Version 1.0 1 Order from Sergey
Capacitor C1 - C51 10 uF ceramic, 5.08 mm lead spacing 51

Mouser 810-FK24X5R1C106K

Note: Can be replaced with tantalum or electrolytic capacitors
Capacitor C52 1 uF ceramic, 5.08 mm lead spacing 1

Mouser 810-FK24X7R1C105K

Note: Can be replaced with tantalum or electrolytic capacitors
Capacitor C53 - C59 0.1 uF ceramic, 5.08 mm lead spacing 7

Mouser 810-FK28X7R1H104K, 80-C323C104K5R

Jameco 25523
Connector BUS1 - BUS8 ISA Edge connector, 98 pin 8

Mouser 806-KSLX-98-BR, 587-395-098-520-350

 
Connector J1 - J4 3x1 pin header 4

Mouser 649-69190-103HLF, 649-78229-103HLF

Jameco 109576
Connector P1, P2, P6, P7 2x1 pin header 4

Mouser 649-78229-102HLF

Jameco 108338
Connector P3 ATX power connector 1 Mouser 538-46015-2006
Jameco (was 365149)
Connector P4 5x2 pin header 1 Mouser 649-68602-110HLF
Connector P5 DE9M, right angle PCB mount 1

Mouser 806-K22X-E9P-NJ15-99 (teal color), 806-K22X-E9P-N-99 (teal color), 806-K22X-E9P-N, 571-1734351-1, 571-7478404

Jameco 104943, 614441, 614459, 614432
Diode D6, D7 1N4148 2

Mouser 512-1N4148, 771-1N4148-T/R

Jameco 36038, 179215
LED D1 - D5 5 mm LED 5

Mouser: Search for T-1 3/4 LED lamps

Jameco 790225 (red, diffused), 107393 (orange, diffused), 697549 (yellow, diffused), 697531 (green, diffused), 2006764 (blue, diffused)

Note: Use different colors for a nicer look :-)
LED Display S1 2 digit 7-segment LED display, 0.56" character height, 18 pin, 15.24 mm (0.6" between pin rows)
 1

Mouser 604-DA56-51PBWA/A (common anode, blue, expensive), search for more options

Jameco 2005366 (common cathode, green), search for more options

Note: Pick either common cathode type or common anode type according to the decoder IC you're planning to use.
Resistor R1, R2 10 kOhm, 1/4 W 2

Mouser 291-10K-RC

Jameco 691104
Resistor R3, R4 1.5 kOhm, 1/4 W 2

Mouser 291-1.5K-RC
Resistor R5, R6 1 kOhm, 1/4 W 2

Mouser 291-1K-RC
Resistor R7 - R11 470 Ohm, 1/4 W 5

Mouser 291-470-RC

Jameco 690785
Resistor Array RR1, RR2 470 Ohm, 16 pin DIP, isolated resistor array 2

Mouser: 652-4116R-1LF-470

Note: Can be replaced with 16 x 470 Ohm resistors
Trimmer Resistor RV1 50 kOhm 1

Mouser: 652-3362P-1-503LF

Note: This trimmer is only needed if using D346D or D347D decoders (U1, U2)
Switch SW1, SW1 6 mm tactile switch 2 Mouser: 653-B3F-1000
IC U1, U2

7 segment decoder

 2

Note: Please refer to the table below for proper decoder/display configuration

74HCT4511/74HC4511 (common cathode):

Mouser: 771-HCT4511N652, 595-CD74HCT4511EE4, 595-CD74HCT4511E, 771-74HC4511N, 595-CD74HC4511EE4, 595-CD74HC4511E
 

Jameco: 822338 

CD4511 (common cathode):

Mouser: 595-CD4511BE, 595-CD4511BEE4

Jameco: 13493, 895377

74LS47 (common anode):

Mouser 595-SN74LS47NE4, 595-SN74LS47N

Jameco: 47790, 295582; Unicorn electronics

74LS247 (common anode, similar to 74LS47, but 6 and 9 with tails):

Mouser: 595-SN74LS247NE4, 595-SN74LS247N;

Jameco: 47247

74LS48 (common cathode):

Jameco: 47811

 

DM9368 (common cathode): Intertex Electronics, or eBay

D346D (common anode): Ask your European friend :-)
IC U3 74LS688 1

Mouser: 595-CD74HCT688, 771-74HCT688N, 595-SN74LS688N
IC U4 74LS574 1 Mouser: 595-SN74AHCT574N, 595-SN74ALS574BN, 595-SN74F574N
IC U5 74HCT74 1 Mouser: 595-SN74AHCT74NE4, 595-SN74AHCT74N, 771-74HCT74N, 595-SN74HCT74N, 595-SN74HCT74NE4, 595-CD74HCT74E, 863-MC74HCT74ANG
IC U6 74LS32 1 Mouser:  595-SN74AHCT32N, 595-SN74ALS32N
IC U7 74HCT14 1

Mouser: 595-SN74AHCT14NE4, 595-SN74AHCT14N, 595-SN74HCT14NE4, 771-74HCT14N, 595-SN74HCT14N, 511-M74HCT14, 595-CD74HCT14E
IC U8 7905 1

Mouser: 512-LM7905CT

Note: This IC is optional, and only required if you need -5V voltage, but your ATX power supply doesn't provide it.
IC Socket U5, U6, U7 14 pin 300 mil DIP socket 3

Mouser 517-4814-3000-CP, 649-DILB14P-223TLF

Jameco 37162
IC Socket U1, U2 16 pin 300 mil DIP socket 2

Mouser 517-4816-3000-CP, 649-DILB16P-223TLF

Jameco 37373
IC Socket U3, U4 20 pin 300 mil DIP socket 2

Mouser 649-DILB20P-223TLF, 517-4820-3000-CP

Jameco 112248

 

7-Segment Decoders and Matching Displays

The ISA Backplane board supports a variety of 7-segment decoders and common anode / common cathode type LED displays. Please use the following table to determine the proper configuration.

7-Segment Decoder Type
Hexadecimal Support
Matching Display Type
J2
J3
J4
Built in current limiters**
74LS47, 74LS247
Limited - Displays distinct figures for codes A-F
Common anode
2-3
2-3
2-3
No
74LS48, 74LS248
Limited - Displays distinct figures for codes A-F
Common cathode
1-2
2-3
2-3
No
CD4511, MC14511, 74HCT4511
No - Displays nothing (blank) for codes A-F
Common cathode
1-2
2-3
1-2
No
Mitel MD4311BE
Yes
Common cathode
1-2
2-3
1-2
No
DM9368
Yes
Common cathode
1-2
1-2
2-3
Yes
DM9370
Yes
Common anode
2-3
1-2
2-3
No
DM9374 Limited - Displays distinct figures for codes A-F Common anode 2-3 1-2 2-3 Yes
D345D Yes Common anode 2-3 1-2 2-3 No
D346D Yes Common anode 2-3 Trim* 2-3 Yes
D347D Limited - Displays distinct figures for codes A-F Common anode 2-3 1-2 2-3 No
D348D
Limited - Displays distinct figures for codes A-F
Common anode
2-3
Trim*
2-3
Yes

* For decoders D346D and D348D the RV1 trimmer should be installed instead of the J3. This trimmer is used to adjust the intensity of the LED display.

** No need for current limiting resistor arrays (RR1, RR2), two 470 Ohm resistors should be used to limit current for the decimal point segment.These resistors should be installed between pins 8 and 9 of RR1 and RR2.

 

Replacement Notes

  • It is recommended to use CMOS parts (74HCT, 74AHCT) for U5 and U7
  • Other logic can be from any TTL compatible series (74AHCT, 74HCT, 74LS, 74ALS, 74F).

 

 

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