IDO-xx ISA Isolated Solid-State Output Cards
16, 32, or 48-channel isolated solid-state digital output ISA cards
FEATURES
- 16, 32, or 48 individually optically isolated solid-state digital outputs
- ISA bus interface for compatible PC expansion slots
- P-channel FET outputs switch user-supplied loads from 5 to 60 VDC
- Up to 1 A continuous or 2 A pulsed per channel, subject to cable limits
- 50 µs turn-on and 2 µs turn-off switching times
- Outputs return to zero volts at power-up and computer reset
- Inductive-spike protection, protective cover, and cable strain relief
- 50-pin ribbon-cable connections
- Designed and manufactured in the USA
Price range: $239.00 through $469.00
In StockDescription
The IDO-xx series provides 16, 32, or 48 individually optically isolated solid-state digital outputs for ISA bus computers. P-channel FET switches control user-supplied load voltages from 5 to 60 VDC, combining fast switching with the long service life of solid-state output devices.
Individually Isolated Outputs
Each output is isolated from the computer and from the other outputs. When an output is enabled, its FET switches the external supply voltage to the output pin. When disabled, the output returns to the return-line voltage. Outputs are at zero volts during power-up and computer reset.
The output drivers support up to 1 A continuous or 2 A pulsed per channel. Cable ratings must also be considered: some ribbon cables limit current to 0.5 A. Diodes provide inductive-spike protection.
Connection and Installation
Output wiring connects through 50-pin ribbon-cable headers on the card. A protective cover helps prevent accidental contact with user voltages, and a strain-relief bar secures cables as they exit the mounting bracket. The full-size ISA card occupies six consecutive I/O address bytes, with one byte for each group of eight outputs on a fully populated card.
Optional STA-50 screw-terminal assemblies simplify field wiring; use one assembly for each group of 16 outputs. CAB50F-6 cables provide a six-foot connection, with other lengths available as CAB50F-xx. Optional ZTR-xx shielded protective jackets help protect ribbon cables from sharp component leads and possible short circuits.
Model Selection
Choose IDO-16 for 16 outputs, IDO-32 for 32 outputs, or IDO-48 for 48 outputs. The 16- and 32-output models are partially populated versions of the same full-size card.
Isolation
The optical isolators are rated for at least 2,000 Vrms, but this component rating is not the isolation rating of the installed card and cabling. The legacy specification states 60 VDC isolation for CE certification. Actual system isolation depends on cabling, pin and PCB spacing, humidity, dust, and other environmental conditions. Conformal coating for higher isolation-voltage tolerance is available on request.
Modified-COTS (MCOTS) Customization
ACCES can tailor any standard product to your precise requirements — electrical, mechanical, firmware, environmental, or connector-level. Common MCOTS options include alternate I/O ranges, isolation enhancements, firmware changes, private labeling, conformal coating, extended temperature operation, ruggedized enclosures, and military-grade components. If this product is close but not a perfect fit, our engineering team can deliver a rapid-turn MCOTS variant with minimal NRE and dependable, Made-in-USA quality.
PC Interface
| Bus | ISA |
|---|---|
| I/O address space | Six bytes; one byte per eight outputs |
| Card size | 13.310 inches long; requires a full-size slot |
Digital Outputs
| Channels | 16 (IDO-16), 32 (IDO-32), or 48 (IDO-48) |
|---|---|
| Output type | Optically isolated P-channel FET switches |
| Load voltage | 5 to 60 VDC, supplied by the user |
| Load current per channel | 1 A maximum continuous; 2 A pulsed. Some ribbon cables limit current to 0.5 A. |
| Turn-on time | 50 µs |
| Turn-off time | 2 µs |
| Switch resistance | 0.4 Ω when saturated |
| Switch leakage current | 1 µA |
| Inductive-spike protection | Diodes across the load |
| Power-up and reset state | Outputs at zero volts |
| Connection | 50-pin on-card ribbon-cable headers |
Isolation
Optically isolated channel-to-channel and channel-to-computer. The legacy specification states 60 VDC isolation for CE certification. Optical isolators are rated for at least 2,000 Vrms; that component rating does not establish the isolation rating of the complete card or installed system. Isolation depends on cabling, pin and PCB spacing, humidity, dust, and other environmental factors. Conformal coating for higher isolation-voltage tolerance is available on request.
Environmental and Power
| Operating temperature | 0 to +60 °C |
|---|---|
| Storage temperature | −20 to +100 °C |
| Humidity | 5% to 95%, noncondensing |
| Card power | +5 VDC at 540 mA typical for the fully populated 48-output model |
Select 16, 32, or 48 isolated solid-state outputs. Each model uses a full-length ISA card; IDO-16 and IDO-32 are partially populated versions of IDO-48.
| Model | Description | Price (USD) | |
|---|---|---|---|
| IDO-16 | 16-channel isolated solid-state digital output ISA card | $239.00 | |
| IDO-32 | 32-channel isolated solid-state digital output ISA card | $349.00 | |
| IDO-48 | 48-channel isolated solid-state digital output ISA card | $469.00 |
Compatible Accessories
- STA-50 — Screw-terminal assembly with two 50-pin headers and breadboard area; use one assembly per 16 outputs
- STB-50 — Screw-terminal board for a 50-pin header connection
- STA-112 — Screw-terminal assembly with 25-, 37-, and 50-pin headers and breadboard area
- CAB50F-6 — 6-foot ribbon cable with 50-pin female connectors at both ends
- CAB50F-XX — Ribbon cable with 50-pin female connectors at both ends; specify length when ordering
- ZTR-xx — Optional shielded protective ribbon-cable jacket; specify required configuration