Measurement Computing PCI-DAS1602/16 - Manual (Page 25)

PCI-DAS1602/16 User's Guide Specifications
24
Digital input / output
Table 9. Digital input/output specifications
Digital type 82C55 emulation
Input 74LS244
Output 74LS373
Number of I/O 24
Configuration 2 banks of 8 and 2 banks of 4, or
3 banks of 8, or
2 banks of 8 with handshake
Input high 2.0 volts min, 7 volts absolute max
Input low 0.8 volts max, -0.5 volts absolute min
Output high 2.4 volts min @ -15 mA
Output low 0.5 volts max @ 64 mA
Power-up / reset state Input mode (high impedance)
Pull-up/pull-down resistors Provisions have been made on the board for user installed pull-up/pull-
down resistor networks
Simultaneous sample and hold trigger TTL output (SSH OUT).
Logic 0 = Hold
Logic 1 = Sample compatible with CIO-SSH16
Interrupts
Table 10. Interrupt specifications
Interrupt INTA# - mapped to IRQn via PCI BIOS at boot-time
Interrupt enable Programmable through PLX9052
Interrupt polarity Active high level or active low level, programmable through PLX9052
Interrupt sources
(software programmable)
External (rising TTL edge event)
Residual counter
A/D End-of-conversion
A/D End-of-channel-scan
A/D FIFO-not-empty
A/D FIFO-half-full
D/A FIFO-not-empty
D/A FIFO-half-full